Relevant bibliographies by topics / OSTBC

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

Academic literature on the topic 'OSTBC'

Author: Grafiati
Published: 4 June 2021
Last updated: 17 June 2025

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Journal articles on the topic "OSTBC"

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Zhang, Dong Ming, Yong Jun Li, Li Ding, and Da Wei Zhang. "Analysis and Simulation of Concatenating Orthogonal STBC with TCM in Fading Channels." Applied Mechanics and Materials 427-429 (September 2013): 2752–55. http://dx.doi.org/10.4028/www.scientific.net/amm.427-429.2752.

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In this paper, we illustrate an orthogonal space-time block code (OSTBC) concatenated with trellis-coded modulation (TCM) model, for information transmission over a multiple-input multiple-output (MIMO) channel with 2 transmit antennas and 1 receive antenna. We establish the model of TCM-OSTBC concatenation using the SIMULINK. Also, the establishment of an independent TCM model and OSTB model are shown in order to compare with the concatenation scheme. Finally, the performance simulation diagram under three schemes is given. As expected, the simulation result clearly shows, the performance of concatenated OSTBC with TCM is better than TCM or OSTBC.
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Rajat Gupta. "Advanced Smart Channel Estimation Scheme for MIMO OSTBC Systems Based Wireless Communication." Journal of Electrical Systems 20, no. 7s (2024): 1853–58. http://dx.doi.org/10.52783/jes.3876.

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Labeling diversity is used in an orthogonal space-time block coded (OSTBC) scheme to improve wireless connection reliability without reducing spectral efficiency. Compared to the conventional STBC system, it achieves improved link dependability. The purpose of this work is to provide a blind wireless channel estimator that is bandwidth-efficient for the OSTBC system. Methods for channel estimation, such as least-squares (LS) & minimum mean square error (MMSE) methods typically use the channel bandwidth inefficiently. The receiver noise variance and prior broadcast pilot symbols knowledge & statistics information of channel are required for LS & MMSE channel estimating algorithms to accurately estimate the channel. An neural network machine learning (NNML) channel estimation with transmitter end power-share is suggested in order to make blind channel estimator simpler for the OSBC-based MIMO transmission & to lessen amount of bandwidth requirement for estimation of channel. By using mathematical modeling equivalent to noise power, we determine the ideal transmit fraction of power that reduces bandwidth consumption due to channel estimate. It is demonstrated that the blind NN-ML nased channel estimation with transmitter power-share uses 20% of the bandwidth of the MMSE & LS wireless channel estimators in order to achieve the OSTBC system's low bit error rate (BER) in the case of M-PSK modulation.
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Naima, SOFI, FATIMA Debbat, and Fethi Tarik Bendimerad. "Performance Improvement of MIMO-OSTBC System with BCH-TURBO Code In Rayleigh Fading Channel." Indonesian Journal of Electrical Engineering and Computer Science 11, no. 3 (2018): 898. http://dx.doi.org/10.11591/ijeecs.v11.i3.pp898-907.

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Recently, OSTBCs has become a widespread technique for signal transmission over wireless channels because of their diversity gain, but there are not designed to achieve an additional coding gain. Hence, OSTBCs must be concatenated with an external code which allows a significant coding gain.FEC (forward error correction) is a technique used for detecting and possibly correcting errors that can occur when messages are transmitted through a digital communication system, also for rendering the information more reliable. Thus, with staffing these coding techniques that are able to reach Shannon limits, in MIMO systems, better performances can be achieved by taking advantages of diversity and coding gains. The objective of this paper is to compare different FEC codes in Rayleigh fading channel and propose an appropriate code for MIMO-OSTBC systems. The simulation results reveal the performance of the proposed model
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Sofi, Naima, Fatima Debbat, and Fethi. Tarik Bendimerad. "Performance Improvement of MIMO-OSTBC System with BCH-TURBO Code In Rayleigh Fading Channel." Indonesian Journal of Electrical Engineering and Computer Science 11, no. 3 (2018): 898–907. https://doi.org/10.11591/ijeecs.v11.i3.pp898-907.

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Recently, OSTBCs has become a widespread technique for signal transmission over wireless channels because of their diversity gain, but there are not designed to achieve an additional coding gain. Hence, OSTBCs must be concatenated with an external code which allows a significant coding gain. FEC (forward error correction) is a technique used for detecting and possibly correcting errors that can occur when messages are transmitted through a digital communication system, also for rendering the information more reliable. Thus, with staffing these coding techniques that are able to reach Shannon limits, in MIMO systems, better performances can be achieved by taking advantages of diversity and coding gains. The objective of this paper is to compare different FEC codes in Rayleigh fading channel and propose an appropriate code for MIMO-OSTBC systems. The simulation results reveal the performance of the proposed model.
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Alausta, Gamal M. "Comparative Study of Different Antenna Configurations for the MIMOOSTBC Technique Using FEC and the Rayleigh Fading Channel." Recent Advances in Electrical & Electronic Engineering (Formerly Recent Patents on Electrical & Electronic Engineering) 13, no. 7 (2020): 1022–27. http://dx.doi.org/10.2174/2352096507666200122094614.

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Background: Multi-Input Multi-Output (MIMO) systems using Orthogonal Space-Time Block Coding (OSTBC) gained extensive popularity in wireless applications owing to the potential of providing improved reliability. Methods: The performance of MIMO - OSTBC systems using error-correcting code (Convolutional, Reed Solomon and Interleaving) schemes used to encode data streams in wireless communications using the Rayleigh channel is reported here. These are subjected to experimentation under modulation schemes such as Quadrature Phase Shift Keying (QPSK). Decoding occurs using the Maximum Likelihood (ML) algorithm, which provides high data rates using spatial domains under the limits of power transmission and limited bandwidths. Results: Different simulations are performed to detect the best BER performance for various antenna configurations and values of antenna configurations with Error Correction so as to use the best outcomes to model the OSTBC. Conclusion: Their effect of improving the overall can be noticed by the advantages of OSTBC with the correcting codes and the maximum number of configurations.
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Al-Qahtani, Dokhyl M., and Abdulhameed M. Al-Sanie. "Relay Selection in Distributed Orthogonal Space-Time Block Coded Networks." Journal of Circuits, Systems and Computers 27, no. 01 (2017): 1850011. http://dx.doi.org/10.1142/s0218126618500111.

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This paper examines the impact of relay selection on the performance of distributed orthogonal space-time block coding (D-OSTBC) in a wireless network. The relay selection algorithm is based on minimizing the pairwise error probability (PER) or equivalently maximizing the signal to noise ratio (SNR) at the receiver. The receiver can always find the optimal selected relay by exhaustive search where the number of relays rarely exceeds four. It is shown in this work that the proposed scheme achieves full diversity order and provides an additional array gain compared to conventional D-OSTBC. Our results show that the proposed scheme is more power efficient than the conventional D-OSTBC. Since 50% of the time the half of the relay is off, the proposed scheme increases the life time of the relay.
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El-Hussien, Mariam, Bassant Abdelhamid, Hesham Elbadawy, Hadia El-Hennawy, and Mehaseb Ahmed. "Performance Enhancement for B5G/6G Networks Based on Space Time Coding Schemes Assisted by Intelligent Reflecting Surfaces with Higher Modulation Orders." Sensors 24, no. 19 (2024): 6169. http://dx.doi.org/10.3390/s24196169.

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Intelligent Reflecting Surfaces (IRS) and Multiple-Input Single-Output (MISO) technologies are essential in the fifth generation (5G) networks and beyond. IRS optimizes the signal propagation and the coverage and is a viable approach to address the issues caused by fading channels that limits the spectral efficiency, while MIMO enhances data rates, reliability, and spectral efficiency by using multiple antennas at both transmitter and receiver ends. This paper proposes an IRS-assisted MISO system using the Orthogonal Space-Time Block Code (OSTBC) scheme to enhance the channel reliability and reduce the Bit Error Rate (BER) in wireless communication systems. The proposed system exploits the benefits from the transmit diversity gain of the OSTBC scheme as well as from the bit energy to noise power spectral density (Eb/No) improvement of the IRS technology. The presented work explores these combined technologies across different modulation schemes. The obtained results outperform the similar previously published works by considering higher-order modulation schemes as well as the deployment of rate ¾ OSTBC-assisted IRS. Moreover, the obtained results demonstrate that the integration of OSTBC with IRS can yield significant performance improvements in terms of Eb/No by 7 dB and 13 dB when using 16 reflecting elements and 64 reflecting elements, respectively.
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M. Abd Elkader, Hala, Gamal M. Abdel-Hamid, Adly Tag El-Dien, and Asmaa A. Nassif. "Combined Beamforming with Orthogonal Space Time Block Code for MIMO-OFDM with Simple Feedback." Indonesian Journal of Electrical Engineering and Computer Science 4, no. 3 (2016): 580. http://dx.doi.org/10.11591/ijeecs.v4.i3.pp580-585.

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<p>In this paper, we introduce a proposed scheme to enhance the performance of orthogonal space time block code (OSTBC) with four time slots and two antennas by combing OSTBC with random beamforming to can use it in the downlink transmission for a mobile system. Multiple-input multiple-output orthogonal frequency-division multiplexing (MIMO-OFDM) system has been recognized as one of the most promising techniques to achieve a good service and increase data rate in the next generation (4&5G) broadband wireless communications. So, we apply Space time block code (STBC) for MIMO-OFDM system with linear decoding. Also, we perform STBC with beamforming for MIMO-OFDM system to improve the performance of a system. Simulation results show that the beamforming improves bit error rate (BER) performance of OSTBC and STBC-OFDM for different types of modulation and diversity.</p>
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Tami, Abdelkader, Mokhtar Keche, and Boubaker S. Bouazza. "New OSTBC for Blind Channel Estimation and Tracking in MIMO-OFDM Systems." Journal of Telecommunications and Information Technology 3 (September 30, 2019): 49–57. http://dx.doi.org/10.26636/jtit.2019.133819.

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Applying orthogonal space time block coding (OSTBC) to multiple-input multiple-output (MIMO) systems helps reduce receiver complexity. However, this approach has been applied only to flat fading channels, as when the channel is a frequency selective fading MIMO channel, OSTBC cannot be used directly since its orthogonal propriety may be lost. Furthermore, the MIMO channel is not always known. To deal with this problem, many techniques were proposed to estimate the channel using a training sequence. Unfortunately, these techniques reduce the useful spectral bandwidth. This paper proposes OSTBC for blind channel estimation and data detection in the case of a MIMO frequency selective channel. The aim of this new OSTBC is twofold: to solve the ambiguity of channel estimation and to reduce the complexity of the detector. By exploiting the well-known technique of orthogonal frequency division multiplexing (OFDM), the frequency selective fading MIMO channel is split into a set of flat fading subchannels. Moreover, to accommodate the fact that a MIMO channel can be time varying, the steady state Kalman channel estimator (SS-KCE) is extended to track the channel’s fast variations. The performance of the proposed blind algorithm is related by the adequate choice of the number of subcarriers and it is compared with other existing approaches by means of Monte Carlo simulations.
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Alhammadi, Asem, and Adnan A. Zain. "On OSTBC Codes for LTE-A Systems-Design and Performance Evaluation." Journal of Science and Technology 20, no. 2 (2015): 58–77. http://dx.doi.org/10.20428/jst.v20i2.940.

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Long Term Evolution-Advanced (LTE-A) is a Fourth Generation (4G) standard of wireless communications that introduces high data rate, high performance, and low delay. These features of LTE-A resulted from the new techniques developed for wireless communications such as Multiple-Input Multiple-Output (MIMO) technique. At the heart of this technique is the Space Time Codes, which were developed by the researchers in recent decades to achieve the mentioned features. The designs of OSTBC codes for MIMO systems having any number of transmit antennas and any number of receive antennas have attracted the attention of many researchers. Based on the theory of real and complex orthogonal designs, this paper deals with the design of real and complex OSTBC codes to be used with real signal set constellation such PAM and complex signal constellation such as PSK and QAM. Real and complex OSTBC codes for MIMO systems with two, three, four, five, six, seven and eight transmit antennas and any number of receive antennas, are presented. Simple linear processing ML decoders are derived and presented. The used channel is Rayleigh fading channel MIMO and assumed to behave in a “quasi-static” fashion. Finally, the performances of OSTBC schemes were evaluated and compared in terms of the Bit Error Rate (BER) and Signal to Noise Ratio (SNR). The environment of simulation is MATLAB which is a powerful tool for mathematical calculation and system simulation. The methods of modulations chosen are QPSK, 16QAM, 64QAM, and 128QAM with gray scale mapping.
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Dissertations / Theses on the topic "OSTBC"

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Shahzad, Hamid, and Jaishankar Botchu. "Applying OSTBC in Cooperative Cognitive Radio Networks." Thesis, Blekinge Tekniska Högskola, Sektionen för ingenjörsvetenskap, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-3097.

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In this report, we introduce cooperative spectrum sensing using orthogonal space time block coding (OSTBC) in order to achieve cooperative diversity in the cognitive radios (CRs) network. Transmit diversity or gain is achieved by introducing more than one antenna on the transmitter and receiver side, but in small electronic mobile devices it looks impractical. The signals received from the primary users (PUs) are amplified by the cognitive relays and further forwarded to the cognitive controller where decisions are made on the basis of the information collected from each cognitive relay. The cooperative relaying protocol used here in cognitive relays is based on an amplifying-forward (AF) scheme. Alamouti scheme in OSTBC has been proposed to achieve better detection performance in CR network. The energy detector performance is analyzed over an independent Rayleigh fading channel. In CR network the secondary user (SU) shares PU's frequency band if it fi nds PU is not in its vicinity. The SU starts using the licensed band and leaves the band as soon as it finds the PU is present or going to use the same band. The detection of the spectrum holes by CRs has to be more agile and intelligent. The main objective of the CRs network is to use the free holes without causing any interference to the PUs. The energy detection technique is simple and outperforms other sensing techniques in cooperative cognitive radio networks. The energy detector collects information from different users, compares it with a certain prede fined threshold () value and then makes a fi nal decision. Detection and false alarm probabilities are derived and manipulated using OSTBC on PU and SU through AF protocol in cooperative communication. The performance of the system is analyzed with single and multiple relays and with and without direct path between the PUs and SUs. Maximum ratio (MRC) and selection combining (SC) schemes are used in energy detector and the results are compared with and without direct link between PU and SU. The analysis is performed by placing the relay close to the PUs. Our results are processed and validated by computer simulation.
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Tahseen, Muhammad Mustafa, MatiUllah Khan, and Farhan Ullah. "Analysis of OSTBC in Cooperative Cognitive Radio Networks using 2-hop DF Relaying Protocol." Thesis, Blekinge Tekniska Högskola, Sektionen för ingenjörsvetenskap, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-2510.

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To achieve cooperative diversity in cognitive radio network, Decode and Forward (DF) protocol is implemented at Cognitive Radios (CRs) using Orthogonal Space Time Block Coding (OSTBC). The 2-hop communication between source and destination is completed with the help of Cognitive Relays (CRs) using Multiple Input Multiple Output (MIMO) technology within the network. To achieve spatial diversity and good code rate Alamouti 2×2 STBC is used for transmission. CR is using the decoding (Decode and Forward (DF)) strategy and without amplifying ability before forwarding data towards destination provide better performance. The main objective of this thesis is to detect Primary User (PU) spectrum availability or non-availability for the use of Secondary Users (SU). The Alamouti STBC encoded data is broadcasted to wireless Rayleigh faded channel through transmitter having two transmitting antennas. The CRs are preferred to place close with PU to detect transmitted signal and because of having decoding capability CRs decode the collected data using Maximum Likelihood (ML) decoding technique then re-encode the decoded data for further transmission towards receiver. The energy of PU signal received at relays is calculated using energy detector used at cognitive controller having authority to make final decision about presence or absence of PU signal within the spectrum by comparing calculated energy of PU received signal with a predefined value. If the calculated signal energy is less than threshold value it is pretended as the absence of PU and in the other case spectrum is assumed as occupied by PU. Decoding PU signal at relays before forwarding towards destination provide better performance in terms of detection probability and decreasing probability of false alarming as the Signal to Noise (SNR) increases. The proposed cooperative spectrum sensing using DF protocol at cognitive relays with Alamouti STBC is implemented and results are validated by MATLAB simulation.<br>+46 455 38 50 00
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Boulaioune, N. (Nora). "High reliability downlink MU-MIMO with new encoded OSTBC approach and superposition modulated side information." Master's thesis, University of Oulu, 2019. http://jultika.oulu.fi/Record/nbnfioulu-201905141747.

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Abstract. The promise of Fifth Generation Mobile Network (5G) heralded 5G-era with apparently unlimited potential outcomes. It resulted in the emergence of new paradigms of thought, better approaches to lead business, new innovative solutions, services and products, and is expected to transform the world as we know it. With the advent of some of those new technologies and use cases which deviate from the traditional human-centric, delay tolerant applications, the need for Ultra-Reliable Low-Latency Communications (URLLC) in the 5G wireless network has become indispensable. In this thesis we investigate how to improve the reliability of a downlink multiuser (MU) MIMO transmission scheme with the use of a new approach of orthogonal space time block codes (OSTBC) and network coding with superposition modulated system and side information. The main advantage here is that we show multiple users can be accommodated with the same resource. This is quite useful in a wireless system where resources are always restricted. This therefore is a combination of two techniques to further enhance reliability. Orthogonality is useful in terms of resolving different signals from multiple antennas in a reduced complexity configuration. Superposition modulation with side information is important as it facilitates the recovery of symbols while still keeping the energy normalized. Thus we carried out a detailed analysis with the new OSTBC approach. It is shown that the performance of a multiuser (MU) MIMO system can be improved significantly in terms of bit, block and frame error rates (BER, BLER and FER) as reliability measures. By accommodating a reasonable number of multiple users, high reliability is achieved at the expense of bringing down the rate. To compensate for the low rate, conventional OSTBC is considered as well, where, as a penalty to pay, multiple orthogonal resources are required.
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Rehman, Atti Ur, and Muhammad Asif. "Spectrum Sensing Techniques for 2-hop Cooperative Cognitive Radio Networks : Comparative Analysis." Thesis, Blekinge Tekniska Högskola, Sektionen för ingenjörsvetenskap, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-3365.

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Spectrum sensing is an important aspect of cognitive radio systems. In order to efficiently utilize the spectrum, the role of spectrum sensing is essential in cognitive radio networks. The transmitter detection based techniques: energy detection, cyclostationary feature detection, and matched filter detection, is most commonly used for the spectrum sensing. The Energy detection technique is implemented in the 2-hop cooperative cognitive radio network in which Orthogonal Space Time Block Coding (OSTBC) is applied with the Decode and Forward (DF) protocol at the cognitive relays. The Energy detection technique is simplest and gives good results at the higher Signal to Noise Ratio (SNR) values. However, at the low SNR values its performance degrades. Moreover, each transmitter detection technique has a SNR threshold, below which it fails to work robustly. This thesis aims to find the most reliable and accurate spectrum sensing technique in the 2-hop cooperative cognitive radio network. Using Matlab simulations, a comparative analysis of three transmitter detection techniques has been made in terms of higher probability of detection. In order to remove the shortcomings faced by all the three techniques, the Fuzzy-combined logic sensing approach is also implemented and compared with transmitter detection techniques.<br>Atti Ur Rehman (atti.rehmman@gmail.com) ph: +358-440458080
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Potter, Chris, Kurt Kosbar, and Adam Panagos. "Hardware Discussion of a MIMO Wireless Communication System Using Orthogonal Space Time Block Codes." International Foundation for Telemetering, 2008. http://hdl.handle.net/10150/606194.

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ITC/USA 2008 Conference Proceedings / The Forty-Fourth Annual International Telemetering Conference and Technical Exhibition / October 27-30, 2008 / Town and Country Resort & Convention Center, San Diego, California<br>Although multiple-input multiple-output (MIMO) systems have become increasingly popular, the existence of real time results to compare with those predicted by theory is still surprisingly limited. In this work the hardware description of a MIMO wireless communication system using orthogonal space time block codes (OSTBC) is discussed for two antennas at both the transmitter and receiver. A numerical example for a frequency flat time correlated channel is given to show the impact of channel estimation.
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Costa, Ana. "Os efeitos da aplicação do programa de prevenção OSTRC no ombro em andebolistas." Bachelor's thesis, [s.n.], 2020. http://hdl.handle.net/10284/9559.

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Projeto de Graduação apresentado à Universidade Fernando Pessoa como parte dos requisitos para obtenção do grau de Licenciada em Fisioterapia<br>Introdução: a articulação gleno-umeral é a articulação mais solicitada no andebol, contudo nem sempre a mais lesada. Quando ocorre lesão leva a um défice de mobilidade e de funcionalidade de todo o membro superior. Objetivo: comparar a eficácia do programa “The OSTRC Shoulder Injury Prevention Programe” proposto pelo Oslo Sport Trauma Reasearch Center a médio prazo e analisar se existe redução da sintomatologia dolorosa da articulação gleno-umeral, nos escalões sénior masculino na modalidade de andebol. Metodologia: aplicação do programa de prevenção OSTRC em clubes da 1ª e 2ª divisão nacional. Resultados: não foram encontrados resultados estatisticamente significativos, quando comparados os indivíduos sujeitos à aplicação do protocolo com indivíduos que não fizeram o protocolo. Conclusão: constatamos que a médio prazo a implementação do protocolo não parece induzir alterações no risco de lesão. Sugerimos a aplicação deste desde a pré-época e até ao final da época desportiva de forma a verificar a sua eficácia.<br>Introduction: glenoumeral joint is the most requested joint in handball, however not always the most injured. When injury occurs it leads to a deficit in mobility and functionality of entire upper limb. Purpose: to compare the effectiveness of the “The OSTRC Shoulder Injury Prevention Program” program proposed by the Oslo Sport Trauma Research Center in the medium term and to analyze whether there is a reduction in painful symptoms of the glenohumeral joint, in the senior handball male category. Methods: application of the OSTRC prevention program in clubs of the 1st and 2nd national division. Results: the results obtained in the study are not statistically significant when comparing the individuals subject to the application of the protocol with individuals who did not do the protocol. Conclusion: we found that in the medium term, the implementation of the protocol does not seem to induce changes in the risk of injury. We suggest the application of this from the pre-season and until the end of the sport season in order to verify its effectiveness.<br>N/A
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Abaza, Mohamed. "Cooperative MIMO techniques for outdoor optical wireless communication systems." Thesis, Brest, 2015. http://www.theses.fr/2015BRES0073/document.

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Au cours de la dernière décennie, les communications optiques en espace libre (FSO) ont pris de l’ampleur dans les deux domaines académiques et industriels. L’importance de FSO s’appuie sur la possibilité de faire un système de transmission économique et écologique avec un débit élevé et sans licence à l’opposition des systèmes de transmission radiofréquences (RF). Dans la plupart des travaux antécédents sur les systèmes multi-émetteurs, seulement les canaux décorrélés ont été considérés. Un canal décorrélé nécessite un espace suffisant entre les émetteurs. Cette condition devient difficile et non-réalisable dans certaines applications. Pour cette raison, nos études se focalisent sur les performances des codes à répétition RC (Repitition Codes) et les codes OSTBC (Orthogonal Space-Time Block Codes) dans des canaux log-normaux corrélés en utilisant une modulation d’intensité et une détection directe (IM/DD). En addition, les effets des différentes conditions météorologiques sur le taux d’erreur moyen (ABER) sont étudiés. Les systèmes FSO à multi-entrées/ multi-sorties MIMO (Multiple-Input Multiple-Output) avec une modulation SSK (Space Shift Keying) ont été abordés. Les résultats obtenus montrent que la SSK est supérieure aux RC avec une modulation d’impulsion (Multiple Pulse Amplitude Modulation) pour toute efficacité spectrale égale ou supérieure à 4 bit/s/Hz. Nous avons aussi analysé les performances d’un système à sauts multiples (Multi-Hop) et des relais à transmission directe (forward relays). Nos simulations montrent que le système ainsi considéré est efficace pour atténuer les effets météorologiques et les pertes géométriques dans les systèmes de communication FSO. Nous avons montré qu’un tel système avec plusieurs entrées et une sortie (MISO, i.e. multiple-input single-output) à sauts multiples est supérieur à un système MISO avec un lien direct (direct link) avec une forte atténuation. Pour satisfaire la demande croissante des réseaux de communication à débits élevés, la communauté scientifique s'intéresse de plus en plus aux systèmes FSO avec des relais full-duplex (FD). Pour ces derniers systèmes, nous avons étudié la probabilité d'erreur moyenne (ABER) et nous avons analysé leurs performances. En considérant des différentes conditions de transmission, les performances de relais FD ont été comparées à celles d'un système avec un lien direct ou des relais half-duplex. Les résultats obtenus montrent que les relais FD ont le minimum ABER. En conséquence, les résultats obtenus dans cette thèse sont très prometteurs pour la prochaine génération de FSO<br>Free-space optical (FSO) communication has been the subject of ongoing research activities and commercial attention in the past few years. Such attention is driven by the promise of high data rate, license-free operation, and cheap and ecological friendly means of communications alternative to congested radio frequency communications. In most previous work considering multiple transmitters, uncorrelated channel conditions have been considered. An uncorrelated channel requires sufficient spacing between transmitters. However, this can be difficult and may not be always feasible in some applications. Thereby, this thesis studies repetition codes (RCs) and orthogonal space-time block codes performance in correlated log-normal FSO channels using intensity modulation and direct detection (IM/DD). Furthermore, the effect of different weather conditions on the average bit error rate (ABER) performance of the FSO links is studied. Multiple-input multiple-output (MIMO) FSO communication systems using space shift keying (SSK) modulation have been also analyzed. Obtained results show that SSK is a potential technique for spectral efficiencies equal or greater than 4 bits/s/Hz as compared to RCs with multiple pulse amplitude modulations. The performance analysis of a multi-hop decode and forward relays for FSO communication system using IM/DD is also considered in this thesis. It is shown that multi-hop is an efficient technique to mitigate atmospheric turbulence and different weather attenuation effects and geometric losses in FSO communication systems. Our simulation results show that multiple-input single-output (MISO) multi-hop FSO systems are superior to direct link and MISO systems over links exhibiting high attenuation. Meeting the growing demand for higher data rates communication networks, a system with full-duplex (FD) relays is considered. For such a system, the outage probability and the ABER performance are analyzed under different turbulence conditions, misalignment error and path loss effects. FD relays are compared with the direct link and half-duplex relays. Obtained results show that FD relays have the lowest ABER and the outage probability as compared to the two other systems. Finally, the obtained results in this thesis are very promising towards the next generation of FSO systems
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Huang, Chuan-Yuan, and 黃傳原. "Semiblind ML Detection of OSTBC-OFDM : Perfect Channel Identifiability and Full Spatial Diversity." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/65729840935438084159.

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碩士<br>國立清華大學<br>通訊工程研究所<br>97<br>This thesis considers semiblind maximum-likelihood (ML) detection of orthogonal space-time block coded OFDM (OSTBC-OFDM) systems within one OSTBC-OFDM block. Chang et al. [5] have shown an interesting channel identifiability result, that the whole time-domain multiple-input multiple-output (MIMO) channel can be uniquely identified in the noise-free situation by only using one of the subchannels to transmit pilots. However, this identifiability condition is in a probability-one sense relying on some mild assumptions on the channel statistics. In this thesis, through judicious use of so-called non-intersecting subspace OSTBCs and pilots over a small amount of subchannels, we establish a “perfect” channel identifiability (PCI) condition under which the channel is uniquely identifiable. The proposed scheme has the total number of pilots larger than that used in the previous probability-one identifiability achieving scheme, but smaller than that required in conventional pilot-aided channel estimation schemes. Also, it is shown that, in additive Gaussian noise and independent and identically distributed Rayleigh fading channels, the semiblind ML detector using the proposed PCI achieving scheme can achieve the same full spatial diversity as the coherent ML receiver. For the application in distributed (cooperative) space-time coding systems, we also extend the semiblind ML detector and the proposed PCI achieving scheme to that for a distributed OSTBC-OFDM scenario. Simulation results are presented to show that the proposed scheme can provide better performance than some existing schemes in both point-to-point and distributed OSTBC-OFDM systems.
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Wei, Shih-ping, and 魏士平. "Interference Mitigation for OSFBC-OFDM Systems in FrequencySelective Fading Channel." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/44892497534541653838.

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碩士<br>國立中山大學<br>通訊工程研究所<br>98<br>Orthogonal frequency division multiplexing (OFDM) is the major technique for next generation wireless communication system because of its high spectral efficiency. In addition, multiple-input multiple-output (MIMO) technique is usually used to further increase system capacity. There are two major coding schemes adopted in MIMO-OFDM systems, i.e. space-time block code (STBC) and space-frequency block code (SFBC). This thesis investigates the orthogonal-space-frequency block code OFDM (OSFBC-OFDM) system. In SFBC-OFDM systems, the channel frequency response is usually assumed to be the same for adjacent subcarriers. However, this assumption is not valid in frequency-selective fading environment. Therefore, the orthogonality of code structure is destroyed, leading to substantial increase in interference and significant decrease in system performance. This thesis proposes a receiver equalizer which adopts an interference cancellation (IC) mechanism to maximize the signal to interference plus noise ratio (SINR). Both the Lagrange multiplier method and eigenvalue method are adopted in the interference cancellation. Simulation experiments are conducted to verify the system performance and results demonstrate that the SINR performance is dramatically improved.
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Chen, Chien-ming, and 陳建民. "A study of OSTC/DC2, a novel subunit of oligosaccharyltransferase, after heat shock." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/r5sj25.

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博士<br>國立中山大學<br>生物科學系研究所<br>102<br>OSTC, a Homo sapiens OSTC/DC2 protein, belongs to a new subunit of mammalian oligosaccharyltransferase (OST). OST transfers the high-mannose sugars to nascent polypeptides during N-linked glycosylation in the lumen of the rough endoplasmic reticulum. In this study, we used synthetic peptides (RMKLPGYLMG) as an antigen to develop a polyclonal antibody against OSTC/DC2. After heat treatment of Balb/c mice, OSTC/DC2 showed up-regulated in some tissues of brain, and peaked at the 12th hour of recover stage. Furthermore, OSTC/DC2 was also up-regulated in cell lines during heat-shock treatment. The strikingly immediate up-regulation of OSTC/DC2 in response to heat shock is only seen in the cortex, suggesting that OSTC/DC2 may have unique functions in neurons. In addition, OSTC/DC2 induction is synchronous to increased expression of HSP70 and activation of AKT after heat shock, supporting the notion that OSTC/DC2 may play a significant role in heat shock response.
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Books on the topic "OSTBC"

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Gesamtdeutschland ist uns Verpflichtung: Aufzeichnungen aus dem FDP-Ostb uro 1951 - 1957. Edition Temmen, 2004.

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OSTBA Air Fryer Oven Cookbook for Beginners: 550 Yummy, Fresh and Healthy Air Fryer Oven Recipes for Quick and Hassle-Free Frying! Independently Published, 2020.

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Shores, Melissa. OSTBA Air Fryer Oven Cookbook: Time-Saved and Simple Recipes for the Novice to Enjoy Their Life Better with Delicious Oil-Free Meals. Independently Published, 2020.

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Book chapters on the topic "OSTBC"

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Mansour, Ali, Joe Youssef, and Koffi-Clement Yao. "Underdetermined BSS of MISO OSTBC Signals." In Independent Component Analysis and Signal Separation. Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-00599-2_85.

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Ruchi Negi and Kanchan Sharma. "Image Transmission in OSTBC MIMO-PLC Over Nakagami-m Distributed Background Noise." In Proceedings of the International Congress on Information and Communication Technology. Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-0755-2_55.

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Fernández-Caramés, Tiago M., Adriana Dapena, José A. García-Naya, and Miguel González-López. "A Decision-Aided Strategy for Enhancing Transmissions in Wireless OSTBC-Based Systems." In Advances in Computational Intelligence. Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-21498-1_63.

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Kaviani, Saeed, Chintha Tellambura, and Witold A. Krzymień. "On the Performance of Transmit Antenna Selection with OSTBC in Ricean MIMO Channels." In Wireless Communications 2007 CNIT Thyrrenian Symposium. Springer US, 2007. http://dx.doi.org/10.1007/978-0-387-73825-3_4.

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Thakur, Prabhat, and Keerti Tiwari. "Error Rate Analysis of Precoded-OSTBC MIMO System Over Generalized-K Fading Channel." In Advances in Systems, Control and Automation. Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-4762-6_28.

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Yan, Jianfei, Zhishan Deng, and Qinbo Chen. "Secrecy Sum Rate Optimization in MIMO NOMA OSTBC Systems with Imperfect Eavesdropper CSI." In Communications and Networking. Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-06161-6_30.

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Castro, Paula M., Ismael Rozas-Ramallal, José A. García-Naya, and Adriana Dapena. "Performance Evaluation over Indoor Channels of an Unsupervised Decision-Aided Method for OSTBC Systems." In Advances in Computational Intelligence. Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-38679-4_13.

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Maxama, Xolani B., and Elisha D. Markus. "VHF OSTBC MIMO System Used to Overcome the Effects of Irregular Terrain on Radio Signals." In Applied Soft Computing and Communication Networks. Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-33-6173-7_18.

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Markus, Elisha Didam, and Xolani B. Maxama. "OSTBC-MIMO Based Radio Propagation System Over Irregular Terrain in the Northern Cape Province of South Africa." In IOT with Smart Systems. Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-3945-6_10.

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Mishra, Priyanka, and Mehboob-ul-Amin. "Evaluating the Performance of Quasi and Rotated Quasi OSTBC System with Advanced Detection Techniques for 5G and IoT Applications." In Enabling Technologies for Next Generation Wireless Communications. CRC Press, 2020. http://dx.doi.org/10.1201/9781003003472-15.

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Conference papers on the topic "OSTBC"

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Huang, Jinliang, and Svan Signell. "Adaptive modulation and power allocation for OSTBC." In Signal Processing (ICICS). IEEE, 2009. http://dx.doi.org/10.1109/icics.2009.5397730.

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Sesha Talpa Sai, PHV, Amiya Bhaumik, Gokul Prasad, Jain Joseph, James KJ, and M. Sucharitha. "Performance of OSTBC-MIMO under different Noises." In 2022 International Conference on Electronics and Renewable Systems (ICEARS). IEEE, 2022. http://dx.doi.org/10.1109/icears53579.2022.9751913.

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Aissaoui, Khalil, Sofien Mhatli, and Rabah Attia. "Performance Analysis of Downlink OSTBC-OFDM and OSTBC-GFDM signals in the context of 5th Generation C-RAN." In 2020 International Wireless Communications and Mobile Computing (IWCMC). IEEE, 2020. http://dx.doi.org/10.1109/iwcmc48107.2020.9148124.

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Sezgin, Aydin. "CTH05-3: On Mutual Information of Stacked OSTBC." In IEEE Globecom 2006. IEEE, 2006. http://dx.doi.org/10.1109/glocom.2006.60.

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Yang, Liang. "Performance Analysis of OSTBC Over Keyhole Fading Channels." In 2008 4th International Conference on Wireless Communications, Networking and Mobile Computing (WiCOM). IEEE, 2008. http://dx.doi.org/10.1109/wicom.2008.3017.

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Alrabadi, O. N., N. Marchetti, A. Kalis, C. B. Papadias, and R. Prasad. "A Novel Real OSTBC via a Single Radio." In ICC 2010 - 2010 IEEE International Conference on Communications. IEEE, 2010. http://dx.doi.org/10.1109/icc.2010.5502143.

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Jayasinghe, L. K. Saliya, Nandana Rajatheva, Prathapasinghe Dharmawansa, and M. Latva-aho. "Dual Hop MIMO OSTBC Communication over Rayleigh-Rician Channel." In 2011 IEEE Vehicular Technology Conference (VTC 2011-Spring). IEEE, 2011. http://dx.doi.org/10.1109/vetecs.2011.5956432.

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Kontorovich, Valeri, and Serguei Primak. "Performance analysis of OSTBC over generalized Gaussian MIMO channels." In the 2009 International Conference. ACM Press, 2009. http://dx.doi.org/10.1145/1582379.1582647.

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Chang, Tsung-Hui, Wing-Kin Ma, and Chong-Yung Chi. "Semiblind ML OSTBC-OFDM Detection in Block Fading Channels." In 2007 IEEE International Conference on Acoustics, Speech, and Signal Processing. IEEE, 2007. http://dx.doi.org/10.1109/icassp.2007.366534.

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Loiola, Murilo B., Renato R. Lopes, and Joao M. T. Romano. "Kalman Filter-Based Channel Tracking in MIMO-OSTBC Systems." In GLOBECOM 2009 - 2009 IEEE Global Telecommunications Conference. IEEE, 2009. http://dx.doi.org/10.1109/glocom.2009.5425545.

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