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Littérature scientifique sur le sujet « Parallel interference cancellation receiver (PIC) »

Auteur : Grafiati
Publié le 23 février 2024

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Articles de revues sur le sujet "Parallel interference cancellation receiver (PIC)"

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Khan, Mr Wasim, Mrs Nilofar Khan et Sanmati Jain. « BER performance analysis of Subtractive interference cancellation (SIC) Using Rayleigh channel in DS-CDMA Receiver system ». INTERNATIONAL JOURNAL OF COMPUTERS & ; TECHNOLOGY 13, no 6 (30 juin 2014) : 4603–14. http://dx.doi.org/10.24297/ijct.v13i6.2523.

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In this paper, we present and analyze the performance of a parallel interference cancellation (PIC) scheme for multicarrier (MC) direct-sequence code-division multiple-access (DS-CDMA) systems. In order to mitigate the multi-path interference (MPI) in the DS CDMA system. At each cancellation stage in the proposed PIC scheme, on each subcarrier, a weighted sum of the soft outputs of the other users in the current stage is cancelled from the soft output of the desired user to form the input to the next stage. At the last stage, the interference cancelled outputs from all the subcarriers are maximal ratio combined (MRC) to form the decision statistic. Parallel interference elimination is first proposed in this paper the multi-path interference are evaluated by tentative decision and known user information. Then the performance over Rayleigh fading channel are analyzed and compared to Matched filter, Decorelator, successive interference cancellation (SIC) and conventional parallel interference cancellation (PIC). It is shown that PIC performance can be improved greatly by using this method with simple structure and easy implementation.
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Manglayev, Talgat, Refik Kizilirmak et Nor Hamid. « GPU Accelerated PIC and SIC for OFDM-NOMA ». Electronics 8, no 3 (26 février 2019) : 257. http://dx.doi.org/10.3390/electronics8030257.

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Non-orthogonal multiple access (NOMA) is a candidate multiple access scheme for the fifth-generation (5G) cellular networks. In NOMA systems, all users operate at the same frequency and time, which poses a challenge in the decoding process at the receiver side. In this work, the two most popular receiver structures, successive interference cancellation (SIC) and parallel interference cancellation (PIC) receivers, for NOMA reverse channel are implemented on a graphics processing unit (GPU) and compared. Orthogonal frequency division multiplexing (OFDM) is considered. The high computational complexity of interference cancellation receivers undermines the potential deployment of NOMA systems. GPU acceleration, however, challenges this weakness, and our numerical results show speedups of about from 75–220-times as compared to a multi-thread implementation on a central processing unit (CPU). SIC and PIC multi-thread execution time on different platforms reveals the potential of GPU in wireless communications. Furthermore, the successful decoding rates of the SIC and PIC are evaluated and compared in terms of bit error rate.
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Deng, Juinn-Horng, et Sheng-Yang Huang. « Partial PIC-MRC Receiver Design for Single Carrier Block Transmission System over Multipath Fading Channels ». International Journal of Antennas and Propagation 2012 (2012) : 1–9. http://dx.doi.org/10.1155/2012/910824.

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Single carrier block transmission (SCBT) system has become one of the most popular modulation systems due to its low peak-to-average power ratio (PAPR), and it is gradually considered to be used for uplink wireless communication systems. In this paper, a low complexity partial parallel interference cancellation (PIC) with maximum ratio combining (MRC) technology is proposed to use for receiver to combat the intersymbol interference (ISI) problem over multipath fading channel. With the aid of MRC scheme, the proposed partial PIC technique can effectively perform the interference cancellation and acquire the benefit of time diversity gain. Finally, the proposed system can be extended to use for multiple antenna systems to provide excellent performance. Simulation results reveal that the proposed low complexity partial PIC-MRC SIMO system can provide robust performance and outperform the conventional PIC and the iterative frequency domain decision feedback equalizer (FD-DFE) systems over multipath fading channel environment.
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Chen, Kai-Sheng, Yi-Chang Chen et Long-Guang Liao. « Advancing High-Speed Transmissions over OCDMA Networks by Employing an Intelligently Structured Receiver for Noise Mitigation ». Applied Sciences 8, no 12 (27 novembre 2018) : 2408. http://dx.doi.org/10.3390/app8122408.

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We propose an intelligently structured receiver to achieve high-speed transmissions over optical code-division multiple access (OCDMA) networks. Employing spectral-amplitude coding (SAC) reduces multiuser interference (MUI) in OCDMA, but the network bit-rate is limited by phase-induced intensity noise (PIIN) coming from the incoherency of light sources. To mitigate PIIN, the receiver performs interference estimations and regenerations through consecutive stages. The MUI is removed by subtracting the estimated interference term from the received multiplexed signals. For PIIN variance, it is both dependent on and positively related to user number and bit-rate. Reducing the number of interference users allows the network to support transmissions with a higher speed under a given noise level. The proposed scheme has the advantages of all-optical signal processing and a compact structure. Additionally, the function of noise suppression is rarely studied in the existing MUI elimination schemes, such as serial interference cancellation (SIC) and parallel interference cancellation (PIC). The simulation results show the proposed receiver achieves significant increment in bit-rate than the conventional balanced detector in SAC–OCDMA networks.
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Han, Xi, Yichen Liu, Qin Liu, Lijun Wang et Zhengping Li. « A Semiblind Receiver for a Two-Way UAV-Aided PIC System Based on the PARAFAC Model ». International Journal of Antennas and Propagation 2022 (9 décembre 2022) : 1–8. http://dx.doi.org/10.1155/2022/4935681.

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In this paper, we consider a two-way communication system using the unmanned aerial vehicle (UAV) as a relay (UAV-aided). This system eliminates impulse interference through an adaptive filter based on the least mean square (LMS) and uses the received signal transmitted by the UAVs to construct a parallel factor (PARAFAC) model. Based on the identifiability condition of the PARAFAC model, a pulse interference cancellation orthogonal pilot tensor (PIC-OPT) receiver without iteration is proposed. Our algorithm is also used in millimeter-wave to achieve the acquisition of channel information. Compared with the least squares method, the simulation results demonstrate the superiority of the proposed semiblind receiver in terms of the relative mean square error and bit error rate.
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Weitkemper, P., K. Zielinski, K. D. Kammeyer et R. Laur. « Optimized power allocation for iterative multiuser detection for a SC-CDMA uplink ». Advances in Radio Science 5 (13 juin 2007) : 273–78. http://dx.doi.org/10.5194/ars-5-273-2007.

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Abstract. This paper deals with optimization of the received power profile for iterative parallel and successive interference cancellation (PIC/SIC) in coded CDMA systems. For practical implementation additional constraints should be applied. This paper focuses on the maximum tolerable bit error rate. It will be shown that optimized power profile can considerably gain the overall system performance. Due to unequal required receive powers an allocation to certain users can be done with respect to their individual power constraints. This is important especially in near-far scenarios. Beside these constraints also the maximum number of iterations is implemented due to limiting the computational complexity in the receiver.
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TAM, WAI M., FRANCIS C. M. LAU et CHI K. TSE. « PERFORMANCE ANALYSIS OF MULTIPLE ACCESS CHAOTIC-SEQUENCE SPREAD-SPECTRUM COMMUNICATION SYSTEMS USING PARALLEL INTERFERENCE CANCELLATION RECEIVERS ». International Journal of Bifurcation and Chaos 14, no 10 (octobre 2004) : 3633–46. http://dx.doi.org/10.1142/s0218127404011545.

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In this Letter, we apply combined linear detector/parallel interference cancellation (PIC) detectors to jointly decode symbols in a multiple access chaotic-sequence spread-spectrum communication system. In particular, three different types of linear detectors, namely single-user detector, decorrelating detector and minimum mean-square-error detector, are used to estimate the transmitted symbols at the first stage of the PIC detector. The technique for deriving the approximate bit error rate (BER) is described and computer simulations are performed to verify the analytical BERs.
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F. Banob, Amir, Fayez W. Zaki et Mohammed M. Ashour. « The effect of quantized ETF, grouping, and power allocation on non-orthogonal multiple accesses for wireless communication networks ». International journal of electrical and computer engineering systems 13, no 8 (10 novembre 2022) : 681–93. http://dx.doi.org/10.32985/ijeces.13.8.8.

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Nonorthogonal multiple access (NOMA) is a significant technology in radio resource sharing and it has been recognized as a favorable method in fifth-generation (5G) wireless networks to meet the requirements of system capacity, service latency, and user connectivity. Many schemes for NOMA have been proposed in the last few years. such as transmitter linear spreading-based NOMA as a code domain, as well as a linear minimum mean square error (LMMSE), parallel interference cancellation (PIC), and serial interference cancellation (SIC) with power allocation and grouping as a power domain at the receiver side for uplink NOMA. This work aims to evaluate the performance of multiple types of linear spreading-based NOMA schemes. Simulations are achieved for the error-rate performance evaluation of these NOMA schemes, received signal after detection, and received signal and effect of every user on the other. Evaluating the performance of these technologies with comparison is also achieved through using grouping and power allocation. Simulations are achieved for the sum rate and spectral efficiency. For the future, 5G NOMA development, an equiangular tight frame (ETF) is suggested for improving performance and suggests grouping with 64qam-quantized Grassmannian for improving performance favorite about grouping with Generalized welch-bound equality (GWBE)
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Li, Haohan, Yongjia Jin, Deguang Zhao, Xuhui Ding et Kai Yang. « Accumulation and Elimination : A Hard Decision-Based Multi-User Interference Cancellation Method in Satellite Communication System ». Electronics 12, no 23 (4 décembre 2023) : 4878. http://dx.doi.org/10.3390/electronics12234878.

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With the increasing number of users in the Medium-Orbit (MEO) satellite communication system, multi-access interference (MAI) has become an important factor that restricts the reliability and capacity of the system. Additionally, the low carrier-power-to-noise-density ratio (C/N0) resulting from long-distance transmission poses a significant concern. The parallel interference cancellation (PIC) algorithm, utilized within the paradigm of multi-user detection (MUD), exhibits the capability to effectively mitigate the impact of MAI within the same system. Simultaneously, coherent accumulation serves as a means to substantially enhance the correct detection probability (Pcd) at low C/N0. In this study, a signal acquisition method for multi-user spread spectrum satellite receivers is proposed, which employs interference cancellation and coherent accumulation as its core mechanisms. Furthermore, we introduce a power estimation method based on the outcomes of signal acquisition, which can be integrated into the signal reconstruction module of PIC. Finally, we implement the aforementioned algorithms in both simulation and hardware platforms. Remarkably, we observe that when the interference-to-signal ratio (ISR) caused by MAI equals 20 dB, the improved algorithm attains a maximum Pcd of 0.95 within the high signal-to-noise ratio (SNR) region, closely approaching the theoretical limit for the bit error rate (BER). The experimental results prove the effectiveness and feasibility of the acquisition algorithm. In summary, the enhanced algorithm holds vast potential for widespread implementation in multi-user spread spectrum communication systems.
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Altalbe, Ali, et Muhammad Tahir. « Performance of Iterative Coded CDMA Receivers with APP Feedback : A Use of a Weighted Delay Filter ». Applied Sciences 13, no 16 (11 août 2023) : 9175. http://dx.doi.org/10.3390/app13169175.

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The prohibitive computational complexity of optimal coded multiuser detection necessitates using suboptimal detectors in practical implementations. The filter is very computationally simple and is also demonstrated to provide faster convergence and superior bit error rate (BER) performance. Further investigation of the weighted delay filter concept produces a second filter—derived via the joint likelihood function. It is analytically demonstrated that extrinsic feedback systems will not benefit from weighted delay filtering. A system model is provided that introduces the notion of feedback ‘residue’, which is shown to be the key difference between a-posterior probability (APP) and extrinsic systems when determining the parallel interference cancellation (PIC) output statistics. It is analytically shown that the weighted delay filter derived via a maximum signal-to-noise ratio (SNR) approach is identical to a weighted delay filter derived via the joint likelihood function. It is analytically shown that when extrinsic feedback is used in a coded-code division multiple access (C-CDMA) system, no benefit will be realised by weighted delay filtering, as soft outputs from previous cycles are a merely scaled, noisy version of the most recent data. The notion of a ‘feedback residue’ for systems with APP feedback is introduced, and it is empirically shown that this residue term is a key consideration when determining the PIC output statistics. Using the ‘residual feedback’ model, it is shown that when APP feedback is utilised, data from previous cycles is not simply “a scaled, noisy version” of the current data. For this reason, benefits may be realised by APP feedback use. The simulation results shows that the residue may be trivial at small loads, the residue builds to the substantial value of nearly 0.4 at a reasonably modest load of K/N=15/10, and continues to grow as the load increases.
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Thèses sur le sujet "Parallel interference cancellation receiver (PIC)"

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Swanchara, Steven F. « An FPGA-Based Multiuser Receiver Employing Parallel Interference Cancellation ». Thesis, Virginia Tech, 1998. http://hdl.handle.net/10919/36983.

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Research efforts have shown that capacity in a DS/CDMA cellular system can be increased through the use of digital signal processing techniques that exploit the nature of the multiple access interference (MAI). By jointly demodulating the users in the system, this interference can be characterized and reduced thus decreasing the overall probability of error in the system. Numerous multiuser structures exist, each with varying degrees of complexity and performance. However, the size and complexity of these structures is large relative to a conventional receiver. This effort demonstrates a practical approach to implementing parallel interference cancellation applied to DBPSK DS/CDMA on an FPGA-based configurable computing platform. The system presented acquires, tracks, cancels, and demodulates four users independently and performs various levels of interference cancellation. The performance gain of the receiver in a four-user environment under various levels of noise and cancellation are presented.
Master of Science
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SHARMA, ANSHUL. « Performance Analysis of MC-CDMA and CI/MC-CDMA Using Interference Cancellation Techniques ». University of Cincinnati / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1218826853.

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Nguyen, Anh-Minh Ngoc. « High-Quality Detection in Heavy-Traffic Avionic Communication System Using Interference Cancellation Techniques ». Diss., Virginia Tech, 2005. http://hdl.handle.net/10919/29069.

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This dissertation focuses on quantifying the effects of multi-user co-channel interference for an avionic communication system operating in a heavy-traffic aeronautical mobile environment and proposes advanced interference cancellation techniques to mitigate the interference. The dissertation consists of two parts. The first part of the work investigates the use of a visualization method to quantify and characterize the multi-user co-channel interference (multiple access interference) effects impinging on an avionic communication system. The interference is caused by complex interactions of thousands of RF signals transmitted from thousands of aircraft; each attempts to access a common communication channel, which is governed by a specific channel contention access protocol. The visualization method transforms the co-channel interference, which is specified in terms of signal-overlaps (signal collisions), from a visual representation to a matrix representation for further statistical analysis. It is found that the statistical Poisson and its cumulative distribution provide the best estimates of multi-user co-channel interference. It is shown, using Monte Carlo simulation, that the co-channel interference of a victim aircraft operating in the heavy-traffic environment could result in as high as eight signal-overlaps. This constitutes to approximately 83.4% of success rate in signal detection for the entire three thousand aircraft environment using conventional FSK receiver. One key finding shows that high-quality communications, up to 98.5% success rate, is achievable if only three overlapping signals can be decoded successfully. The interference results found in the first part set the stage for interference cancellation research in the second part. The second part of the work proposes the use of advanced interference cancellation techniques, namely sequential interference cancellation (SIC) and parallel interference cancellation (PIC), as potential solutions to mitigating the interference effects. These techniques can be implemented in radio receivers to perform multi-signal decoding functionality to remove the required interferers (three overlapping signals) so that high-quality communication, as described in the first part, can be achieved. Various performance graphs are shown for B-FSK and B-PSK for both SIC and PIC techniques. One key finding is that the system performance can be improved substantially to an additional 15% in signal reception success rate by using SIC or PIC. This means that critical information transmitted from 450 aircraft (out of approximately three thousand aircraft in the environment) is preserved and successfully decoded. Multi-signal decoding using these interference cancellation receivers comes at a small penalty of 2 - 4.5 dBs in Eb/No when sufficient signal-to-interference (SIR) ratio (7-12 dB) is provided.
Ph. D.
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Wang, Beibei. « Improved Statistical Interference Suppression Techniques in Single and Multi-rate Direct Sequence Spread Spectrum Code Division Multiple Access Systems ». Ohio University / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1173119961.

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Boussebt, Amina. « Etude et mise en oeuvre de la technologie Li-Fi pour un lit de bébé connecté sans fil et sans radio ». Electronic Thesis or Diss., Limoges, 2023. http://www.theses.fr/2023LIMO0091.

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Le domaine de la télésurveillance a connu un grand essor ces dernières décennies et concerne divers contextes par exemple en milieu hospitalier, en maison de retraite, chez les particuliers. La majorité des systèmes de télésurveillance existants aujourd’hui reposent sur la technologie des radiofréquences (RF). Nous proposons dans cette thèse, des travaux portant sur la télésurveillance dans un contexte nouveau qui concerne une crèche. Les RF présentant certains inconvénients, comme l’impact des interférences électromagnétiques, mais aussi des failles de sécurité, une solution alternative est la technologie de communication par optique sans fil. Ainsi, nous avons étudié l'utilisation de la technologie infrarouge pour la transmission simultanée de données issues de capteurs placés sur les pieds des lits de bébé mais aussi sur les bébés couchés dans leur lit au sein de la crèche. Le système de réception est constitué de photodiodes situées aux coins d'un panneau d'éclairage central au plafond de l'environnement. La simulation du canal réalisée grâce à la technique de lancer de rayons associés à la méthode de Monte-Carlo a permis de déterminer le gain du canal pour chaque dispositif. Plusieurs scénarios de déploiement ont été définis en considérant le caractère amovible ou fixe des dispositifs et l’interchangeabilité des lits dans la pièce. Le partage du canal utilise la technique d’accès multiple par répartition de codes (OCDMA) associée aux codes optiques orthogonaux (OOC) dont la principale limitation est l’interférence d’accès multiple (IAM). Les performances de la modulation binaire par position d’impulsion (2-PPM) avec OCDMA et un décodage souple en réception ont été établies théoriquement et par simulation pour les différents scénarios définis considérant un réseau de 11 utilisateurs constitué de 8 lits et 3 dispositifs portés par des bébés. Les résultats ont été obtenus avec des récepteurs conventionnels par corrélation sans et avec limiteur puis un récepteur à annulation parallèle d’interférence plus efficace pour réduire l’impact de l’IAM. De plus, la faisabilité de l’utilisation de la technique OCDMA pour la transmission simultanée en optique sans fil a été mise en évidence par des expérimentations menées grâce à un banc de test développé en radio logicielle. Le banc a été mis en place, en utilisant des USRP (Universal Software Radio Peripheral) et des front-ends optique sans fil développés spécifiquement
The field of the remote monitoring has experienced significant advancements in recent decades, and now covers different contexts, such as hospitals, retirement homes, and private homes also. The majority of existing systems are based on radio frequency technology (RF).We propose in this thesis, research focused on remote monitoring in a new context involving a nursery. Given the limitations of RF technology, including the impact of electromagnetic interference, and security vulnerabilities, an alternative solution is optical wireless communication technology. Therefore, we investigated the use of infrared technology for simultaneous transmission of data collected from sensors placed on the foot of baby beds, and also on the babies themselves lying in their beds within the nursery. The reception system consists of photodiodes positioned at the corners of a central lighting panel on the celling. The channel simulation carried out using ray-tracing and Monte-Carlo methods was used to determine the channel gain for each device. Several deployment scenarios were defined, considering the nature of the devices (removable or fixed) and the interchangeability of beds in the room. The channel sharing employs the code division multiple access (OCDMA) associated with the optical orthogonal codes (OOC) with the primary constraint being the137 multiple access interference (MAI). The performance of binary pulse position modulation (2- PPM) with OCDMA and soft decoding in reception was studied theoretically and by simulation involving the different scenarios. These scenarios consider a network of 11 users, consisting of 8 beds and 3 devices carried by babies. Results were obtained using the conventional correlation receiver without and with hard limiters, as well as a parallel interference cancellation receiver to reduce the impact of MAI. Additionally, the feasibility of implementing OCDMA technology for simultaneous optical wireless communication transmission was demonstrated through experimental work using a test bench developed in software-defined radio. The test bench was established using universal software radio peripheral (USRP), and specially designed wireless optical front-ends
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Junior, José Valdemir dos Reis. « Modelagem de redes CDMA-PON baseadas em técnicas de cancelamento paralelo e códigos corretores de erros ». Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/18/18155/tde-14122009-105507/.

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A oferta de novos serviços para os usuários finais, como o denominado triple play, que consiste no tráfego simultâneo de voz, vídeo e dados utilizando a mesma infra-estrutura de comunicação, vem exigindo que as estruturas de rede das operadoras ofereçam largura de banda adequada e qualidade de serviço. Nesse contexto, as redes ópticas passivas (PON) vêm se destacando em virtude de oferecerem maior largura de banda a custos relativamente baixos. Nas redes ópticas passivas, trechos de fibras ópticas podem ser compartilhados entre diversos assinantes, exigindo, para isso, a utilização de técnicas de controle de acesso múltiplo. Destaque maior é dado à técnica de acesso múltiplo por divisão de códigos ópticos (OCDMA), por apresentar características tais como maior segurança e capacidade flexível sob demanda. O desempenho dessa tecnologia é basicamente limitado pela interferência de acesso múltiplo, ou interferência multiusuário (MAI). No presente trabalho, cenários OCDMA-PON utilizando códigos ópticos unidimensionais, baseados na codificação prima modificada (MPC), e bidimensionais, baseados na codificação óptica ortogonal de múltiplos comprimentos de onda (MWOOC), são descritos, e seus respectivos desempenhos investigados. Os desempenhos desses sistemas são verificados utilizando-se os seguintes esquemas de modulação: 1) On-off Keying (OOK), cujo formalismo para a codificação padded MPC (PMPC) e double padded MPC (DPMPC) foi aqui desenvolvido, 2) por posição de pulso (PPM), considerando os ruídos poissonianos de deteção, cujo formalismo foi também aqui desenvolvido, 3) por posição de pulso (PPM) considerando apenas a interferência de acesso múltiplo (MAI), 4) semelhante ao (3), porém, utilizando a técnica mitigadora de MAI via cancelamento paralelo de interferência (PIC), e 5) semelhante ao (4) porém utilizando modulação por chaveamento de frequência (FSK). Em seguida, a codificação bidimensional MWOOC, utilizando modulação OOK, é analisada com e sem a utilização de PIC. Além desses esquemas, são também incluídas, pela primeira vez nesses formalismos, técnicas de correção posterior de erro (FEC) baseadas no algoritmo Reed-Solomon (RS). A figura de mérito adotada nas simulações é baseada no cálculo da taxa de erro de bit (BER). Os resultados obtidos para os diversos casos investigados neste trabalho indicam que a combinação PIC/FEC deve ser considerada de modo a se obter níveis de BER compatíveis com a região livre de erros (BER < \'10 POT.-12\') para os cenários de redes de acesso atuais e futuros (visando atender a 32 ou 64 usuários simultâneos).
The advent of new services offered to end users, such as the so called triple play, which consists in the simultaneous traffic of voice, video, and data through the same communication infrastructure, has been pushing telecom operators towards providing adequate bandwidth as well as quality of service. This has brought the spotlight to passive optical networks (PONs) by virtue of their considerably higher bandwidth at relatively low cost. In PONs, certain fiber optic spans can be shared among different users as long as multiple access control techniques are used. One such technique is the optical code division multiple access (OCDMA) technique, which, in addition, presents improved data security and flexible capacity on demand. The performance of this technology is basically limited by multi access interference (MAI), which becomes more severe as the number of simultaneous users increases. In the present work, OCDMA-PON scenarios utilizing one- and two-dimensional optical codes separately such as modified prime codes (MPC) and multi-wavelength optical orthogonal codes (MWOOC), are described and thoroughly investigated. The performances of these systems are investigated based on the following modulation schemes: 1) On-off keying (OOK), where a new formalism for the double-padded MPC is proposed, 2) Pulse position modulation (PPM), and 3) Frequency shift keying (FSK) together with MAI mitigation technique based on parallel interference cancelation (PIC). Besides these schemes, it is also included for the first time in these formalisms forward error correction techniques (FEC) based on the Reed-Solomon (RS) algorithm. The figure of merit adopted in all simulations is the bit error rate (BER). The results obtained for the cases investigated in this work indicate that the combination PIC/FEC must be considered if one is interested in obtaining BER levels compatible with the error-free region (BER < \'10 POT.-12\') for the current and future access network scenarios (aiming at attending 32 or 64 simultaneous users).
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Chen, Jun-Hong, et 陳俊宏. « Optical CDMA Receiver Based on Parallel Interference Cancellation at Single Cancellation Stage ». Thesis, 2015. http://ndltd.ncl.edu.tw/handle/20785069286744437550.

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碩士
國立東華大學
電機工程學系
103
In an Optical Code Division Multiple Access (OCDMA) system, the error probability becomes larger when the number of users increases and so does the multiple access interference (MAI). As an interference suppression technique, an Optical Parallel Interference Cancellation (OPIC) scheme was introduced. The complexity, the high cost and the time consumption of this scheme, however, make it unsuitable for local area network (LAN). A simpler one-stage OPIC (OSOPIC) is thus derived in this paper to suppress the MAI. It reduces the cost and takes less time, which is more suitable for LAN and provides better performance.
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Her, Jian-Hau, et 何健豪. « DSP Implementation of CDMA Receiver Base on Parallel Interference Cancellation ». Thesis, 2001. http://ndltd.ncl.edu.tw/handle/35684801087733805326.

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碩士
國立交通大學
電子工程系
89
The improved understanding of the theoretical basis of multiuser detection and advances in digital,mixed-signal,and RF technologies let the realization of advanced DS-CDMA receive based on multiuser detection principles become a eality.Due to the lowe complexity, subtractive interference cancellation approaches are attractive for practical implementation of multiuser detection.In this thesis,we implement a 3GPP DS-CDMA receive based on parallel interference cancellation (PIC)together with a corresponding wireless channel simulator.A desktop PC acts as the controller,and a DSP-embedded card is employed to implement the wireless channel simulato and the PIC eceiver.In wireless channel simulation,we simulate the e ffect of multipath Rayleigh fading on the transmitted signal at baseband.The implementation of the PIC eceive employs some techniques to reduce the complexity.For e fficiency and ease of programming,multithreading is adopted in the controller.When there are 5 users,a single path for each user,and a single antenna in the system,the processing speed of the channel simulator is 4.1M chips per second and that of the PIC receive at the initial stage is also 4.1M chips per second.
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Yu, Ying-Shin, et 游英信. « Iterative Parallel Interference Cancellation Receiver with QR Decompositionin MIMO System ». Thesis, 2008. http://ndltd.ncl.edu.tw/handle/87321917195676937137.

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碩士
中原大學
電子工程研究所
96
In this thesis, we propose a new iterative parallel interference cancellation receiver architecture. QR-decomposition algorithm is used to compute the transmitted signals roughly in advance, and followed by an iterative parallel interference cancellation (Iterative PIC) to calculate them several times. The simulation shows that the new receiver architecture not only keeps the original frame error rate(FER) in several iteration but also reduces large number of operations comparing with standard iterative parallel interference cancellation (Iterative PIC-STD) and iterative parallel interference cancellation with decision statistics combining (Iterative PIC-DSC).
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Chang, Wei-Yun, et 張維盷. « A Study of Multistage Parallel Interference Cancellation Receiver in Wideband CDMA System ». Thesis, 2000. http://ndltd.ncl.edu.tw/handle/99082851250069824779.

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碩士
國立交通大學
電子工程系
88
The wideband direct-sequence code division multiple access (W-CDMA) transmission technique has been widely investigated and also has become to standard of UMTS/IMT2000 for the third generation (3G) mobile communication systems. In this thesis, various parallel interference cancellation (PIC) receivers with 3G standard are studied. The multistage partial PIC (PPIC) receiver is demonstrated to provide more robust performance than other PIC schemes. The performance comparisons are achieved by computer simulations. We also study the pilot-channel-aided channel estimation for the PPIC receiver in multipath fading environment. A multistage channel estimation scheme, which makes use of a multistage PPIC scheme, is proposed to improve the accuracy of the channel estimation. We also show the impairment of the multiple　access interference (MAI) due to pilot channel signals. A modified PPIC (MPPIC) receiver, which performs pre-cancellation of the pilot channel signals before parallel interference cancellation processes, is proposed to reduce this effect. From the simulation results, we can show that MPPIC receiver with multistage channel estimation will improve performance and increase link capacity of the wideband CDMA system.
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Actes de conférences sur le sujet "Parallel interference cancellation receiver (PIC)"

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Michelini, Marco, Romano Fantacci et Dania Marabissi. « Selective parallel interference cancellation (S-PIC) receiver for MC-CDMA systems ». Dans ITCom 2002 : The Convergence of Information Technologies and Communications, sous la direction de Carl R. Nassar. SPIE, 2002. http://dx.doi.org/10.1117/12.455406.

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Jain, Samta. « Implementation of parallel interference cancellation algorithm for rake receiver and comparison with convention PIC ». Dans 2013 Annual International Conference on Emerging Research Areas (AICERA) - 2013 International Conference on Microelectronics, Communications and Renewable Energy (ICMiCR). IEEE, 2013. http://dx.doi.org/10.1109/aicera-icmicr.2013.6575937.

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Tian, Ying-Hua, Song Chen, Sheng Wang et Xin-Peng Chen. « Parallel Interference Cancellation for MIMO Radar Receiver ». Dans 2015 4th International Conference on Mechatronics, Materials, Chemistry and Computer Engineering. Paris, France : Atlantis Press, 2015. http://dx.doi.org/10.2991/icmmcce-15.2015.110.

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Wang Zhongpeng. « Enhanced parallel-interference cancellation receiver based on MIMO systems ». Dans IET Conference on Wireless, Mobile and Sensor Networks 2007 (CCWMSN07). IEE, 2007. http://dx.doi.org/10.1049/cp:20070075.

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Honjo, Katsunari, et Tomoaki Ohtsuki. « LLR Based Iterative Reduced-Complexity MLD Algorithm with Parallel Interference Cancellation (PIC) in MIMO Systems ». Dans 2007 IEEE 65th Vehicular Technology Conference. IEEE, 2007. http://dx.doi.org/10.1109/vetecs.2007.480.

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Lin, Lili. « A Hybrid Multi-user Receiver Based on Parallel Interference Cancellation and Improved Genetic Algorithm ». Dans 2008 International Conference on Computer Science and Software Engineering. IEEE, 2008. http://dx.doi.org/10.1109/csse.2008.1402.

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Ahmed, Maged, Ahmed El-Mahdy et Kairy El-Barbary. « Performance analysis of adaptive Hard Decision Parallel Interference Cancellation receiver in asynchronous Multicarrier DS-CDMA system ». Dans 2011 28th National Radio Science Conference (NRSC). IEEE, 2011. http://dx.doi.org/10.1109/nrsc.2011.5873603.

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Zouine, Y., Z. Madini, K. S. Aloui et J. Foshi. « Performance analysis of parallel interference cancellation receiver applied to hybrid OCDMA/WDM System for high-speed optical access ». Dans 2015 Asia-Pacific Microwave Conference (APMC). IEEE, 2015. http://dx.doi.org/10.1109/apmc.2015.7413184.

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