Relevant bibliographies by topics / MIMO ; Spatial Modulation ; experimental

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  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Academic literature on the topic 'MIMO ; Spatial Modulation ; experimental'

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Published: 4 June 2021
Last updated: 15 February 2022

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Journal articles on the topic "MIMO ; Spatial Modulation ; experimental"

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Guo, Xinyue, Keer Zhang, and Xufa Huang. "Switching MIMO System with Adaptive OFDM Modulation for Indoor Visible Light Communication." Advances in Condensed Matter Physics 2018 (September 2, 2018): 1–7. http://dx.doi.org/10.1155/2018/5694196.

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In this paper, we propose and experimentally demonstrate a switching multiple input and multiple output (MIMO) system combining with adaptive orthogonal frequency division multiplexing (OFDM) modulation for high-speed indoor visible light communications. The adaptive OFDM modulation, which is realized by power and bit allocation on OFDM subchannels, is utilized to achieve the maximum channel capacity under a given target bit error rate (BER). Meanwhile, the MIMO mode switches between spatial multiplexing and transmit diversity adapting to the channel correlation, where the modulation order solved by adaptive OFDM modulation is chosen as the switching criterion. Experimental results validate data rates improvement over the pure spatial multiplexing and the pure transmit diversity system, where BERs are all below the 7% preforward error correction (pre-FEC) threshold of 3.8 × 10−3 in experiments.
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Zhang, Xinhe, Yuehua Zhang, Chang Liu, and Hanzhong Jia. "Low-Complexity Detection Algorithms for Spatial Modulation MIMO Systems." Journal of Electrical and Computer Engineering 2018 (November 15, 2018): 1–7. http://dx.doi.org/10.1155/2018/4034625.

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In this paper, the authors propose three low-complexity detection schemes for spatial modulation (SM) systems based on the modified beam search (MBS) detection. The MBS detector, which splits the search tree into some subtrees, can reduce the computational complexity by decreasing the nodes retained in each layer. However, the MBS detector does not take into account the effect of subtree search order on computational complexity, and it does not consider the effect of layers search order on the bit-error-rate (BER) performance. The ost-MBS detector starts the search from the subtree where the optimal solution is most likely to be located, which can reduce total searches of nodes in the subsequent subtrees. Thus, it can decrease the computational complexity. When the number of the retained nodes is fixed, which nodes are retained is very important. That is, the different search orders of layers have a direct influence on BER. Based on this, we propose the oy-MBS detector. The ost-oy-MBS detector combines the detection order of ost-MBS and oy-MBS together. The algorithm analysis and experimental results show that the proposed detectors outstrip MBS with respect to the BER performance and the computational complexity.
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Yamaguchi, Kazuhiro, Takaharu Nagahashi, Takuya Akiyama, Hideaki Matsue, Kunio Uekado, Takakazu Namera, Hiroshi Fukui, and Satoshi Nanamatsu. "Computer Simulation and Field Experiment for Downlink Multiuser MIMO in Mobile WiMAX System." Scientific World Journal 2015 (2015): 1–10. http://dx.doi.org/10.1155/2015/481676.

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The transmission performance for a downlink mobile WiMAX system with multiuser multiple-input multiple-output (MU-MIMO) systems in a computer simulation and field experiment is described. In computer simulation, a MU-MIMO transmission system can be realized by using the block diagonalization (BD) algorithm, and each user can receive signals without any signal interference from other users. The bit error rate (BER) performance and channel capacity in accordance with modulation schemes and the number of streams were simulated in a spatially correlated multipath fading environment. Furthermore, we propose a method for evaluating the transmission performance for this downlink mobile WiMAX system in this environment by using the computer simulation. In the field experiment, the received power and downlink throughput in the UDP layer were measured on an experimental mobile WiMAX system developed in Azumino City in Japan. In comparison with the simulated and experimented results, the measured maximum throughput performance in the downlink had almost the same performance as the simulated throughput. It was confirmed that the experimental mobile WiMAX system for MU-MIMO transmission successfully increased the total channel capacity of the system.
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Tuan, Le Minh, Le Hoang Son, Hoang Viet Long, L. Rajaretnam Priya, K. Ruba Soundar, Y. Harold Robinson, and Raghvendra Kumar. "ITFDS: Channel-Aware Integrated Time and Frequency-Based Downlink LTE Scheduling in MANET." Sensors 20, no. 12 (June 16, 2020): 3394. http://dx.doi.org/10.3390/s20123394.

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One of the crucial problems in Industry 4.0 is how to strengthen the performance of mobile communication within mobile ad-hoc networks (MANETs) and mobile computational grids (MCGs). In communication, Industry 4.0 needs dynamic network connectivity with higher amounts of speed and bandwidth. In order to support multiple users for video calling or conferencing with high-speed transmission rates and low packet loss, 4G technology was introduced by the 3G Partnership Program (3GPP). 4G LTE is a type of 4G technology in which LTE stands for Long Term Evolution, followed to achieve 4G speeds. 4G LTE supports multiple users for downlink with higher-order modulation up to 64 quadrature amplitude modulation (QAM). With wide coverage, high reliability and large capacity, LTE networks are widely used in Industry 4.0. However, there are many kinds of equipment with different quality of service (QoS) requirements. In the existing LTE scheduling methods, the scheduler in frequency domain packet scheduling exploits the spatial, frequency, and multi-user diversity to achieve larger MIMO for the required QoS level. On the contrary, time-frequency LTE scheduling pays attention to temporal and utility fairness. It is desirable to have a new solution that combines both the time and frequency domains for real-time applications with fairness among users. In this paper, we propose a channel-aware Integrated Time and Frequency-based Downlink LTE Scheduling (ITFDS) algorithm, which is suitable for both real-time and non-real-time applications. Firstly, it calculates the channel capacity and quality using the channel quality indicator (CQI). Additionally, data broadcasting is maintained by using the dynamic class-based establishment (DCE). In the time domain, we calculate the queue length before transmitting the next packets. In the frequency domain, we use the largest weight delay first (LWDF) scheduling algorithm to allocate resources to all users. All the allocations would be taken placed in the same transmission time interval (TTI). The new method is compared against the largest weighted delay first (LWDF), proportional fair (PF), maximum throughput (MT), and exponential/proportional fair (EXP/PF) methods. Experimental results show that the performance improves by around 12% compared with those other algorithms.
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Cogalan, T., H. Haas, and E. Panayirci. "Optical spatial modulation design." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 378, no. 2169 (March 2, 2020): 20190195. http://dx.doi.org/10.1098/rsta.2019.0195.

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Visible light communication (VLC) systems are inherently signal-to-noise ratio (SNR) limited due to link budget constraints. One favourable method to overcome this limitation is to focus on the pre-log factors of the channel capacity. Multiple-input multiple-output (MIMO) techniques are therefore a promising avenue of research. However, inter-channel interference in MIMO limits the achievable capacity. Spatial modulation (SM) avoids this limitation. Furthermore, the performance of MIMO systems in VLC is limited by the similarities among spatial channels. This limitation becomes particularly severe in intensity modulation/direct detection (IM/DD) systems because of the lack of phase information. The motivation of this paper is to propose a system that results in a multi-channel transmission system that enables reliable multi-user optical MIMO SM transmission without the need for a precoder, power allocation algorithm or additional optics at the receiver. A general bit error performance model for the SM system is developed for an arbitrary number of light-emitting diodes (LEDs) in conjunction with pulse amplitude modulation. Based on this model, an LED array structure is designed to result in spatially separated multiple channels by manipulating the transmitter geometry. This article is part of the theme issue ‘Optical wireless communication’.
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Choi, Jiwook, Yunseo Nam, and Namyoon Lee. "Spatial Lattice Modulation for MIMO Systems." IEEE Transactions on Signal Processing 66, no. 12 (June 15, 2018): 3185–98. http://dx.doi.org/10.1109/tsp.2018.2827325.

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Basnayaka, Dushyantha A., and Harald Haas. "MIMO Interference Channel Between Spatial Multiplexing and Spatial Modulation." IEEE Transactions on Communications 64, no. 8 (August 2016): 3369–81. http://dx.doi.org/10.1109/tcomm.2016.2580146.

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Solanki, KS, and Abhilasha Singh. "MULTIPLE ACTIVE SPATIAL MODULATION IN MIMO SYSTEMS." International Journal of Advanced Research 5, no. 9 (September 30, 2017): 391–93. http://dx.doi.org/10.21474/ijar01/5340.

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Anto., Nicy. "MULTIPLE ACTIVE SPATIAL MODULATION IN MIMO SYSTEMS." International Journal of Advanced Research 4, no. 9 (September 30, 2016): 547–51. http://dx.doi.org/10.21474/ijar01/1516.

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Park, Myung Chul, and Dong Seog Han. "A Golden Coded-Spatial Modulation MIMO System." Journal of the Institute of Electronics and Information Engineers 50, no. 10 (October 25, 2013): 31–40. http://dx.doi.org/10.5573/ieek.2013.50.10.031.

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Dissertations / Theses on the topic "MIMO ; Spatial Modulation ; experimental"

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Serafimovski, Nikola. "Extension and practical evaluation of the spatial modulation concept." Thesis, University of Edinburgh, 2013. http://hdl.handle.net/1842/7597.

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The spatial modulation (SM) concept combines, in a novel fashion, digital modulation and multiple antenna transmission for low complexity and spectrally efficient data transmission. The idea considers the transmit antenna array as a spatial constellation diagram with the transmit antennas as the constellation points. To this extent, SM maps a sequence of bits onto a signal constellation point and onto a spatial constellation point. The information is conveyed by detecting the transmitting antenna (the spatial constellation point) in addition to the signal constellation point. In this manner, inter-channel interference is avoided entirely since transmission is restricted to a single antenna at any transmission instance. However, encoding binary information in the spatial domain means that the number of transmit antennas must be a power of two. To address this constraint, fractional bit encoded spatial modulation (FBE—SM) is proposed. FBE–SMuses the theory of modulus conversion to facilitate fractional bit rates over time. In particular, it allows each transmitter to use an arbitrary number of transmit antennas. Furthermore, the application of SM in a multi-user, interference limited scenario has never been considered. To this extent, the average bit error rate (ABER) of SM is characterised in the interference limited scenario. The ABER performance is first analysed for the interference-unaware detector. An interference-aware detector is then proposed and compared with the cost and complexity equivalent detector for a single–input multiple–output (SIMO) system. The application of SM with an interference-aware detector results in coding gains for the system. Another area of interest involves using SM for relaying systems. The aptitude of SM to replace or supplement traditional relaying networks is analysed and its performance is compared with present solutions. The application of SM to a fixed relaying system, termed dual-hop spatial modulation (Dh-SM), is shown to have an advantage in terms of the source to destination ABER when compared to the classical decode and forward (DF) relaying scheme. In addition, the application of SM to a relaying system employing distributed relaying nodes is considered and its performance relative to Dh-SM is presented. While significant theoretical work has been done in analysing the performance of SM, the implementation of SM in a practical system has never been shown. In this thesis, the performance evaluation of SM in a practical testbed scenario is presented for the first time. To this extent, the empirical results validate the theoretical work presented in the literature.
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Wu, Xiping. "Wireless communication systems based on spatial modulation MIMO." Thesis, University of Edinburgh, 2015. http://hdl.handle.net/1842/10505.

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Spatial modulation (SM) is a unique single-stream, multiple-input multiple-output (MIMO) transmission technique. Unlike traditional MIMO schemes, SM sends out signals through a single active antenna, and achieves multiplexing gains by encoding information bits into the index of the currently active antenna. In contrast to multi-stream MIMO systems, this particular characteristic offers great superiority in two main aspects. Firstly, SM completely avoids inter-channel interference. Secondly, SM requires a single radio-frequency chain, regardless of the number of antennas used, and therefore exhibits a significant energy saving. However, the property of a single active antenna challenges the channel estimation process for SM: the transmit antennas have to be activated sequentially for sending pilot signals. As a result, the time consumed in pilot transmission is proportional to the number of transmit antennas. However, this fact has so far been neglected in related research. Also, published research on SM has focused on point-to-point communications, and few have covered a network perspective. In this thesis, a comprehensive study is undertaken on SM systems in single-user, multi-user and multi-cell scenarios. As a unique three-dimensional modulation scheme, SM enables a trade-off between the size of the signal constellation diagram and the size of the spatial constellation diagram. In this thesis, an optimum transmit structure is proposed for SM to employ an adaptive scale of antennas against channel correlations. Unlike traditional antenna selection methods, this new approach is not sensitive to fast fading, due to the exploitation of statistical channel state information (CSI) instead of instant CSI. The proposed transmit structure is demonstrated to have a near-optimal performance against exhaustive search, while achieving very low computational complexity. In addition, three novel methods are developed to improve the channel estimation process for SM. A first method estimates the entire MIMO channel by sending pilot signals through only one of the transmit antennas, among which the channel correlation is exploited. In a similar way but focusing on the receiver, a second method can improve the estimation accuracy without increasing the pilot sequence length. A third method balances the transmission power between pilot and data to minimise the bit error rate. A framework of combined channel estimation is also proposed, in which the three methods are jointly applied. Furthermore, the antenna allocation in multi-user SM is studied, in order to explore multi-user diversity gains. A method that jointly manages transmit antennas and receive antennas for all co-channel users is proposed. The aim of this new method is to maximise the channel capacity for each user, and the fairness among users is taken into account. It is demonstrated that the proposed method significantly improves the performance of multi-user SM, especially when serving a large number of users. Finally, a novel cooperative scheme is proposed for SM in a multi-cell scenario. Based on the concept of coordinated multi-point transmission (CoMP), this scheme enables the coordinated users to swap the base station antennas pertaining to them. A three-tier cellular architecture is further developed to switch between CoMP and the cooperative scheme.
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Younis, Abdelhamid. "Spatial modulation : theory to practice." Thesis, University of Edinburgh, 2014. http://hdl.handle.net/1842/8990.

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Spatial modulation (SM) is a transmission technique proposed for multiple–input multiple– output (MIMO) systems, where only one transmit antenna is active at a time, offering an increase in the spectral efficiency equal to the base–two logarithm of the number of transmit antennas. The activation of only one antenna at each time instance enhances the average bit error ratio (ABER) as inter–channel interference (ICI) is avoided, and reduces hardware complexity, algorithmic complexity and power consumption. Thus, SM is an ideal candidate for large scale MIMO (tens and hundreds of antennas). The analytical ABER performance of SM is studied and different frameworks are proposed in other works. However, these frameworks have various limitations. Therefore, a closed–form analytical bound for the ABER performance of SM over correlated and uncorrelated, Rayleigh, Rician and Nakagami–m channels is proposed in this work. Furthermore, in spite of the low–complexity implementation of SM, there is still potential for further reductions, by limiting the number of possible combinations by exploiting the sphere decoder (SD) principle. However, existing SD algorithms do not consider the basic and fundamental principle of SM, that at any given time, only one antenna is active. Therefore, two modified SD algorithms tailored to SM are proposed. It is shown that the proposed sphere decoder algorithms offer an optimal performance, with a significant reduction of the computational complexity. Finally, the logarithmic increase in spectral efficiency offered by SM and the requirement that the number of antennas must be a power of two would require a large number of antennas. To overcome this limitation, two new MIMO modulation systems generalised spatial modulation (GNSM) and variable generalised spatial modulation (VGSM) are proposed, where the same symbol is transmitted simultaneously from more than one transmit antenna at a time. Transmitting the same data symbol from more than one antenna reduces the number of transmit antennas needed and retains the key advantages of SM. In initial development simple channel models can be used, however, as the system develops it should be tested on more realistic channels, which include the interactions between the environment and antennas. Therefore, a full analysis of the ABER performance of SM over urban channel measurements is carried out. The results using the urban measured channels confirm the theoretical work done in the field of SM. Finally, for the first time, the performance of SM is tested in a practical testbed, whereby the SM principle is validated.
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Quadar, Nordine. "Permutation Spreading Technique Employing Spatial Modulation for MIMO-CDMA Systems." Thesis, Université d'Ottawa / University of Ottawa, 2017. http://hdl.handle.net/10393/37044.

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Spatial Modulation (SM) is a spatial multiplexing technique designed for MIMO systems where only one transmit antenna is used at each time. It is considered to be an attractive choice for future wireless communication systems as it reduces Inter Channel Interference (ICI) while maintaining high energy efficiency. It can achieve this goal by mapping block of data bits into constellation points in the spatial and signal domain. Combining this innovative method with multiple access techniques could improve the system performance and enhance the data rate. In Code Division Multiple Access (CDMA) method employing parity bit permutation spreading, the bit error rate (BER) performance could be improved by using the parity bits to select the spreading sequence to use at each signalling interval. In this thesis, a new system model based on SM and CDMA employing parity bit permutation spreading is proposed and investigated. The proposed system takes advantage of the benefits of both techniques. In this system, in addition to use the parity bits to select the spreading sequences, same concept is used to select the combination of antennas to activate at each time instant. By doing so, a reduction of power consumption, Inter-Channel and Inter Symbol Interference effect can be achieved while keeping a certain diversity order compared to SM. Multiuser scenario is also discussed in order to investigate the multiple access interference (MAI) effects in synchronous transmission. In such case, the receiver estimates the desired user's information by considering the other users' signal as additional noise. Simulation results of the proposed MIMO-CDMA system employing permutation spreading show, for single user and multiuser, a significant improvement of the BER performance in low signal to noise ratio (SNR) when SM is implemented.
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Sun, Yafei. "Generalized Spatial Modulation with Correlated Antennas in Rayleigh Fading Channels." International Foundation for Telemetering, 2014. http://hdl.handle.net/10150/578366.

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ITC/USA 2014 Conference Proceedings / The Fiftieth Annual International Telemetering Conference and Technical Exhibition / October 20-23, 2014 / Town and Country Resort & Convention Center, San Diego, CA
Spatial modulation (SM) is a transmission scheme where only one transmit antenna is active at any time instant. It thus reduces interchannel interference (ICI) and receiver complexity over traditional multi-antenna systems. However, the spectral efficiency of SM is low. To improve the spectral efficiency, generalized spatial modulation (GSM) can be used. In this paper, we propose to apply the Alamouti technique with GSM for correlated antennas, and show that the proposed approach provides significant improvement over conventional SM and GSM. Our study also shows the importance of bit-to-antenna mappings and their roles on the selection of appropriate correlated antennas.
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Stavridis, Athanasios. "On the energy efficiency of spatial modulation concepts." Thesis, University of Edinburgh, 2015. http://hdl.handle.net/1842/15951.

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Spatial Modulation (SM) is a Multiple-Input Multiple-Output (MIMO) transmission technique which realizes low complexity implementations in wireless communication systems. Due the transmission principle of SM, only one Radio Frequency (RF) chain is required in the transmitter. Therefore, the complexity of the transmitter is lower compared to the complexity of traditional MIMO schemes, such as Spatial MultipleXing (SMX). In addition, because of the single RF chain configuration of SM, only one Power Amplifier (PA) is required in the transmitter. Hence, SM has the potential to exhibit significant Energy Efficiency (EE) benefits. At the receiver side, due to the SM transmission mechanism, detection is conducted using a low complexity (single stream) Maximum Likelihood (ML) detector. However, despite the use of a single stream detector, SM achieves a multiplexing gain. A point-to-point closed-loop variant of SM is receive space modulation. In receive space modulation, the concept of SMis extended at the receiver side, using linear precoding with Channel State Information at the Transmitter (CSIT). Even though receive space modulation does not preserve the single RF chain configuration of SM, due to the deployed linear precoding, it can be efficiently incorporated in a Space Division Multiple Access (SDMA) or in a Virtual Multiple-Input Multiple-Output (VMIMO) architecture. Inspired by the potentials of SM, the objectives of this thesis are the evaluation of the EE of SM and its extension in different forms of MIMO communication. In particular, a realistic power model for the power consumption of a Base Station (BS) is deployed in order to assess the EE of SM in terms of Mbps/J. By taking into account the whole power supply of a BS and considering a Time Division Multiple Access (TDMA) multiple access scheme, it is shown that SM is significantly more energy efficient compared to the traditional MIMO techniques. In the considered system setup, it is shown that SM is up to 67% more energy efficient compared to the benchmark systems. In addition, the concept of space modulation is researched at the receiver side. Specifically, based on the union bound technique, a framework for the evaluation of the Average Bit Error Probability (ABEP), diversity order, and coding gain of receive space modulation is developed. Because receive space modulation deploys linear precoding with CSIT, two new precoding methods which utilize imperfect CSIT are proposed. Furthermore, in this thesis, receive space modulation is incorporated in the broadcast channel. The derivation of the theoretical ABEP, diversity order, and coding gain of the new broadcast scheme is provided. It is concluded that receive space modulation is able to outperform the corresponding traditional MIMO scheme. Finally, SM, receive space modulation, and relaying are combined in order to form a novel virtual MIMO architecture. It is shown that the new architecture practically eliminates or reduces the problem of the inefficient relaying of the uncoordinated virtual MIMO space modulation architectures. This is undertaken by using precoding in a novel fashion. The evaluation of the new architecture is conducted using simulation and theoretical results.
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Sun, Yafei, and Deva K. Borah. "Performance Study of Precoding Techniques on Generalized Spatial Modulation with Correlated Antennas." International Foundation for Telemetering, 2015. http://hdl.handle.net/10150/596384.

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ITC/USA 2015 Conference Proceedings / The Fifty-First Annual International Telemetering Conference and Technical Exhibition / October 26-29, 2015 / Bally's Hotel & Convention Center, Las Vegas, NV
Spatial modulation (SM) reduces transceiver complexity and inter-channel interference over traditional multiple input multiple output (MIMO) systems. It has been shown recently in the literature that the use of a precoder in an SM or a generalized spatial modulation (GSM) system can significantly improve error performance. This paper investigates two issues related to precoders: 1) the use of a precoder in Alamouti-GSM systems, and 2) the effects of power constraints on the precoder design. The results in this paper show that Alamouti-GSM can improve system performance by several dB. On power constraint issues, the paper shows that there is a trade-off between limiting antenna power fluctuations and the potential gain due to precoders.
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JUAJINOY, JOSE LUIS CALPA. "DECOUPLED SIGNAL DETECTION IN THE UP-LINK OF MU-MIMO SYSTEMS WITH SPATIAL MODULATION." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2017. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=30930@1.

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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO
COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR
PROGRAMA DE EXCELENCIA ACADEMICA
Este trabalho de dissertação de mestrado apresenta os resultados obtidos com a conjunção de duas técnicas propostas para utilização em modernos sistemas de comunicações: a Modulação Espacial (Spatial Modulation - SM) e a detecção desacoplada de sinais. Na primeira parte são abordados os fundamentos teóricos da detecção de sinais com modulação espacial, uma comparação entre os sistemas MIMO (Multiple Input Multiple Output) tradicionais e os sistemas SM-MIMO, uma revisão bibliográfica sobre trabalhos previamente feitos no tema e os diferentes tipos de detectores que podem ser empregados em sistemas com modulação espacial. A seguir são abordadas diferentes técnicas para desacoplamento de sinais, as quais permitem a separação na estação radio-base dos sinais oriundos de diferentes tipos de usuários, visando simplificar e adequar o procedimento de detecção às necessidades do usuário da rede. Finalmente uma análise de desempenho, em termos da taxa de erro de bit, e complexidade computacional, em termos do número médio de flops requerido por vetor de símbolos detectado, é realizada para as diferentes associações de técnicas de desacoplamento e detectores SM enfocados neste trabalho.
This work dissertation presents the results obtained from the conjunction of two proposal techniques for the use in modern systems of communications: the Spatial Modulation and the Decoupling Signal Detection. In the first part are discussed the theorical bases of the signal detection with Spatial Modulation, a comparison between the traditional MIMO systems and the SM-MIMO systems, a bibliographical review about previousworks in the topic and the different kinds of detectors that can be used in systems with Spatial Modulation. Then the different techniques of signal decoupling are discussed, which allow the separation in the radio base station of the signals coming from the different classes of users, to simplify and adapt the process of detection and the requirements of the user in the network. Finally a performance analysis in terms of the bit error rate and computational complexity in terms of average number of flops required fot the vector of symbols detected, is done for the studied detectors in the dissertation, using the same different techniques of decoupling studied in this work.
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Mokh, Ali. "Receive and Transmit Spatial Modulation Techniques for Low Complexity Devices." Thesis, Rennes, INSA, 2018. http://www.theses.fr/2018ISAR0020.

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L'Internet des objets est l'un des concepts clefs stimulant l'évolution des réseaux mobiles dans le but de leur donner de nouvelles fonctionnalités de communication et de gestion d'objets dits connectés. Comparativement aux terminaux mobiles standards, les usages associés à ces objets connectés sont en général caractérisés par des débits modestes et de faibles ressources en capacité de calcul et en énergie. Les techniques de modulation spatiale (SM) sont proposées comme une solution prometteuse pour assurer les débits des objets connectés tout en maîtrisant le critère de la consommation énergétique. L'objectif de cette thèse est d'étudier les performances de différents schémas de transmission basés sur le concept SM mis en oeuvre en transmission ou en réception. Nous avons notamment proposé un système global de communication en liaisons montante (SM en transmission) et descendante (SM en réception) entre une station de base et un objet, dans lequel l'essentiel de la complexité de calcul est concentré à la station de base. Par ce système, une liaison avec un objet peut être établie en limitant les traitements au sein de l'objet à di simples fonctions d'activation/désactivation d'antenne et de détection à seuil. Par ailleurs, nous avons proposé des schémas SM étendus grâce auxquels l'efficacité spectrale atteignable devient égale au nombre d'antennes au sein de l'objet. Les expressions analytiques de la probabilité d'erreur binaire ont été développées pour l'ensemble des systèmes étudiés en utilisant différentes méthodes de détection. L'impact de la connaissance imparfaite de l'état des canaux de propagation ainsi que l'effet des corrélations entre antennes ont également été incorporés dans l'étude des performances des schémas SM de réception. Dans une dernière partie, nous avons proposé d'adapter les schémas SM de réception dans un environnement de propagation en ondes millimétriques en utilisant une formation de faisceau hybride analogique/numérique au niveau de l'émetteur
Internet of Things is one of the keyword that represents the evolution in 5G that is able to connect the so-called Connected Devices (CD) to the network. These CDs are expected to require modest data rates and will be characterized by low resources in terms of both computation and energy consumption compared to other mobile multi-media devices. Spatial Modulation (SM) is proposed to be a promising solution to boost the data rate of the CD with a small ( or no) increase in energy consumption. Inspired by the advantages of SM, the objective of this thesis is to study the performance of different transmission scheme based on the SM concept at the transmitter and at tht receiver, for respectively an uplink and a downlink transmission between a BS and a CD. We proposed a global system where the higher computational complexity remains at the BS: The transmit SM is used for uplink, and the receive SM for downlink. It is shown that with SM, an ON­OFF keying for uplink and Single Tap detector for downlink could be sufficient for the transmission a the CD. Also, with Extended SM schemes, we increased the spectral efficiency of SM to be equal t< the number of antennas of CD in both uplink and downlink transmission. A framework for the derivation of the Bit Error Probability (BEP) is developed for all schemes with different detection methods. Impact of imperfect CSIT transmission has been studied when linear precoding is implemented for the receive spatial modulation, as well as the effect of antenna correlations. Finally we proposed to adapte the spatial modulation at the receiver with the mmWave environment, using hybrid beamformina at the transmitter
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Baines, Stephanie. "The modulation of information processing by reward expectation and spatial attention." Thesis, University of Oxford, 2010. http://ora.ox.ac.uk/objects/uuid:1ea37eb4-6c3a-4000-8fdb-7d5de7a34e55.

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Reward expectation and spatial attention both exert powerful control over behaviour and modulate neural activity. The experiments in this thesis aimed to chart the dynamics of reward expectation effects across the time course of information processing and examine the relationship between reward and attention. Experiments 3.1 and 3.2 parametrically manipulated reward magnitude in the presence or absence of attention and demonstrated reward could influence reaction time (RT) under conditions of time pressure. Experiments 4.1 and 4.2 independently varied reward and spatial probabilities and illustrated independent and interactive effects of reward and attention at late stages of cognitive processing (the P300 potential), as well as modulation of detection sensitivity (d') by reward under conditions of uncertainty when reward was able to work through feature-based attention. The experiment of Chapter 5 cued reward and attention trial by trial and showed under these conditions, not only could reward influence late stages of information processing, but expectation of reward reduced peak latency of the visual N1 potential. Reward and attention also modulated motor preparation with both independent and interactive effects. The experiment of Chapter 6 examined the dynamics of reward association with task-relevant targets and irrelevant distracters during visual search and demonstrated that task-irrelevant but motivationally-salient distracter items could capture attentional resources away from the target, guided by endogenous reward association alone. The experiments of this thesis demonstrated the ability of reward expectation to modulate both behaviour and multiple stages of information processing, with effects predominantly independent from those of attention. Reward could influence processing from early visual analysis and target detection stages. Interaction between the two systems occurred at late processing stages, whereby reward and attentional information may have been integrated to provide a cohesive representation of the stimulus given the current environmental conditions.
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Book chapters on the topic "MIMO ; Spatial Modulation ; experimental"

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Anoh, Kelvin O., Y. A. S. Dama, H. M. AlSabbagh, E. Ibrahim, R. A. Abd-Alhameed, Fauzi Elmegri, Trust T. Mapoka, Mohammad Ngala, and S. M. R. Jones. "An Evaluation of Spatial Modulation for MIMO Systems with QO-STBC." In Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, 313–21. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-18802-7_42.

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Lunawat, Raj Rajeshwari, Debashis Adhikari, and Priyanka Tupe Waghmare. "Microstrip Antenna Array Design for Generalized Spatial Modulation—Multiple Input Multiple Output (GSM-MIMO) Applications." In Lecture Notes in Networks and Systems, 83–94. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-10-8198-9_9.

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Ren, Wei, Guan Gui, and Fei Li. "Performance Evaluation of Structured Compressed Sensing Based Signal Detection in Spatial Modulation 3D MIMO Systems." In Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, 94–102. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-73317-3_12.

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Humadi, Khaled M., Ahmed Iyanda Sulyman, and Abdulhameed Alsanie. "Experimental Results for Generalized Spatial Modulation Scheme with Variable Active Transmit Antennas." In Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, 260–70. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-24540-9_21.

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Kumbhani, Brijesh, and Rakhesh Singh Kshetrimayum. "Spatial Modulation." In MIMO Wireless Communications over Generalized Fading Channels, 87–110. CRC Press, 2017. http://dx.doi.org/10.1201/9781315116778-4.

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Vazquez Araujo, Francisco J., Jose A., Miguel Gonzalez-Lopez, Luis Castedo, and Javier Garcia-Frias. "Experimental Evaluation of MIMO Coded Modulation Systems: are Space-Time Block Codes Really Necessary?" In MIMO Systems, Theory and Applications. InTech, 2011. http://dx.doi.org/10.5772/15287.

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Niu, Yaqing, Sridhar Krishnan, and Qin Zhang. "Spatio-Temporal Just Noticeable Distortion Model Guided Video Watermarking." In Crime Prevention Technologies and Applications for Advancing Criminal Investigation, 66–84. IGI Global, 2012. http://dx.doi.org/10.4018/978-1-4666-1758-2.ch006.

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Perceptual Watermarking should take full advantage of the results from human visual system (HVS) studies. Just noticeable distortion (JND), which refers to the maximum distortion that the HVS does not perceive, gives a way to model the HVS accurately. An effective Spatio-Temporal JND model guided video watermarking scheme in DCT domain is proposed in this paper. The watermarking scheme is based on the design of an additional accurate JND visual model which incorporates spatial Contrast Sensitivity Function (CSF), temporal modulation factor, retinal velocity, luminance adaptation and contrast masking. The proposed watermarking scheme, where the JND model is fully used to determine scene-adaptive upper bounds on watermark insertion, allows providing the maximum strength transparent watermark. Experimental results confirm the improved performance of the Spatio-Temporal JND model. The authors’ Spatio-Temporal JND model is capable of yielding higher injected-watermark energy without introducing noticeable distortion to the original video sequences and outperforms the relevant existing visual models. Simulation results show that the proposed Spatio-Temporal JND model guided video watermarking scheme is more robust than other algorithms based on the relevant existing perceptual models while retaining the watermark transparency.
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Conference papers on the topic "MIMO ; Spatial Modulation ; experimental"

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Nyawade, Andrew, Peter O. Akuon, Hongjun Xu, and Vitalis Oduol Kalecha. "Spatial MIMO Rank Modulation." In 2019 IEEE AFRICON. IEEE, 2019. http://dx.doi.org/10.1109/africon46755.2019.9134052.

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Narayanan, Sandeep, Marium Jalal Chaudhry, Athanasios Stavridis, Marco Di Renzo, Fabio Graziosi, and Harald Haas. "Multi-user spatial modulation MIMO." In 2014 IEEE Wireless Communications and Networking Conference (WCNC). IEEE, 2014. http://dx.doi.org/10.1109/wcnc.2014.6952128.

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Basnayaka, Dushyantha A., and Harald Haas. "Spatial modulation for massive MIMO." In 2015 IEEE International Conference on Signal Processing for Communications (ICC). IEEE, 2015. http://dx.doi.org/10.1109/icc.2015.7248610.

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Legnain, R. M., R. H. M. Hafez, I. D. Marsland, and A. M. Legnain. "A novel spatial modulation using MIMO spatial multiplexing." In 2013 1st International Conference on Communications, Signal Processing, and Their Applications (ICCSPA). IEEE, 2013. http://dx.doi.org/10.1109/iccspa.2013.6487232.

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Lai, I.-Wei, Hong-Wei Chen, and Yuan-Hao Huang. "Adaptive MIMO Detector for Spatial Modulation." In 2015 Third International Symposium on Computing and Networking (CANDAR). IEEE, 2015. http://dx.doi.org/10.1109/candar.2015.18.

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Zhu, Xudong, Zhaocheng Wang, Qi Wang, and Harald Haas. "Virtual Spatial Modulation for MIMO Systems." In GLOBECOM 2016 - 2016 IEEE Global Communications Conference. IEEE, 2016. http://dx.doi.org/10.1109/glocom.2016.7842377.

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Zhang, Chunqiong, Dan Feng, Mengmeng Liu, and Baoming Bai. "Spatial Modulation Based MIMO-OTFS Transmissions." In 2021 IEEE/CIC International Conference on Communications in China (ICCC Workshops). IEEE, 2021. http://dx.doi.org/10.1109/icccworkshops52231.2021.9538858.

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Raafat, Ahmed, Adrian Agustin, and Josep Vidal. "Receive Spatial Modulation for Massive MIMO Systems." In 2017 IEEE Global Communications Conference (GLOBECOM 2017). IEEE, 2017. http://dx.doi.org/10.1109/glocom.2017.8254890.

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Choi, Jiwook, Yunseo Nam, and Namyoon Lee. "Spatial Lattice Modulation Techniques for MIMO Systems." In 2017 IEEE Global Communications Conference (GLOBECOM 2017). IEEE, 2017. http://dx.doi.org/10.1109/glocom.2017.8254915.

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Castillo-Soria, F. R., J. Sanchez-Garcia, V. I. Rodriguez-Abdala, and R. Parra-Michel. "Multiuser MIMO downlink transmission using spatial modulation." In 2014 6th IEEE Latin-American Conference on Communications (LATINCOM). IEEE, 2014. http://dx.doi.org/10.1109/latincom.2014.7041848.

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