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检索条件"主题词=Space Time Block Coding"

共 134 条记录，以下是71-80 订阅

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Performance Enhancement of Cognitive Radio Spectrum Sharing (CRSS) with MIMO System

Performance Enhancement of Cognitive Radio Spectrum Sharing ...

引用

IEEE International Conference on Computer, Communication and Control (IC4)

作者： Kale, Pranil Sunil Lohiya, Padma DY Patil Coll Engn Pune Maharashtra India

ISBN: (纸本)9781479981632

A key challenge in operating cognitive radios (CRs) in a self-organizing (ad hoc) network is to adaptively and efficiently allocate transmission powers and spectrum among CRs according to the surrounding environment. Cognitive radio networks provide high bandwidth to mobile users via heterogeneous wireless architectures and dynamic spectrum access techniques. CR networks inflict challenges due to the fluctuating nature of the available spectrum, as well as the diverse QoS requirements of various applications. This paper considers a multiuser spectrum sharing (SS) system operating in a different fading environment and every node in the system is equipped with multiple antennas. The system employs orthogonal space-time block coding at the secondary users. The average capacity and error performance under a peak interference constraint are analyzed for this system using the distributed algorithm. For a comparison purpose, an analysis of the transmit antenna selection scheme is also presented.

关键词： Spectrum sharing cognitive radio multiuser diversity space time block coding

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Analyzing the performance of the space-time block codes with partial channel state feedback

Analyzing the performance of the space-time block codes with...

引用

IEEE Wireless Communications and Networking Conference

作者： Sharma, N Geraniotis, E Univ Maryland Dept Elect Engn College Pk MD 20742 USA

ISBN: (纸本)0780365968

The theory of space-time codes for multiple antennas at the transmitter and receiver provided a useful framework for minimizing the probability of pair-wise frame error when the channel is unknown at the receiver. The design criterion for the codes were developed by averaging over all the channel states. In practice, a feedback channel of low band-width is usually available where the transmitter can get some channel state information from the receiver. The transmitter can use this information to change it's power level or modulation or both. Since the channel state is a matrix instead of a scalar in the single antenna case, we first find out what is the sufficient statistic for space-time orthogonal block codes. It is shown that for a given channel state, the decoder essentially sees an AWGN channel with the signal to noise ratio scaled by the sufficient statistic. We discuss the optimal power control and adaptive modulation strategies. The effect of delay in passing the channel information from the receiver to the transmitter is examined. The results show a significant improvement (more than 10 dB in some cases) over the conventional system without feedback.

关键词： block codes State feedback AWGN channels feedback channel Receivers performing spaces Power control Transmitter Channel state information multiple antenna power level space time block coding

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Channel Estimation and Tracking for Closed Loop EO-STBC with Differentially Encoding Feedback

Channel Estimation and Tracking for Closed Loop EO-STBC with...

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IEEE International Symposium on Signal Processing and Information Technology (ISSPIT)

作者： Hussin, Mohamed Nuri Weiss, Stephan Univ Strathclyde Ctr Excellence Signal & Image Proc Dept EEE Glasgow Lanark Scotland

ISBN: (纸本)9781467307536

Extended orthogonal space time block coding (EO-STBC) can achieve high transmit diversity over a multiple-input multiple-output (MIMO) channel. To do so, it requires channel state information on the transmitter side, which needs to be estimated and fed back from the receiver. Therefore, this paper explores an estimation and tracking scheme by means of a Kalman filter, which is integrated with EO-STBC detection and exploits the smooth evolution of the channel coefficients by applying differential feedback. For slow fading, we propose the inclusion of a drift vector in the Kalman model, which is motivated by a second order approximation of the underlying channel model and can be shown to offer advantages in terms of temporal smoothness when addressing channels whose coefficient trajectories evolve smoothly.

关键词： Feedback channel estimation Channel Coefficient space time block coding tracking slow fading Kalman filters diversity reception channel model Channel state information Loops Contraceptive Coil

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Performance Improvement for OFDM-RoF Transported 60 GHz System using Spatial Diversity and Multiplexing

Performance Improvement for OFDM-RoF Transported 60 GHz Syst...

引用

IEEE International Conference on Communications (ICC) / Wireless Communications Symposium / 3rd Workshop on Optical Wireless Communications (OWC)

作者： Habib, Usman Aighobahi, Anthony E. Nair, Manish Zhu, Huiling Quinlan, Terence Walker, Stuart D. Gomes, Nathan J. Univ Kent Commun Res Grp Canterbury Kent England Univ Essex Sch Comp Sci & Elect Engn Colchester Essex England

ISBN: (纸本)9781509015252

60 GHz system architectures with Radio over Fiber (RoF) transport and integrated transmitters/receivers provide a comprehensive solution for future mobile systems. Since 60 GHz communication relies on line-of-sight (LoS) conditions and narrow-beam antennas to compensate the high path-loss, it has limitations in terms of coverage for multiple user locations. In this paper, performance analysis of a 60 GHz integrated transmitter and receiver system supported by RoF transport has been performed experimentally at different user locations for up to 1.5m transmission distance. Extension of experimental results to prove feasibility for longer distances has been shown with a simulation model, whose results at various shorter distances have been benchmarked against the acquired experimental results at different user locations. A modified version of the Saleh Valenzuela channel has been used to model the millimeter wave (mmW) LoS indoor experimental environment. Furthermore, as a proof of concept, we present an experimental analysis demonstrating an improvement in performance of the proposed RoF based 60 GHz system using spatial diversity and multiplexing. Channel measurements at different transmitter/receiver locations and their processing have shown that an improvement (decrease from 12.5% to 10.5%) in Error Vector Magnitude (EVM) can be achieved using the Alamouti space time block coding algorithm. Then it has been shown that a two-fold data rate increase can be obtained by combining data from two transmitter locations using the Zero Forcing algorithm.

关键词： Radio over Fiber Remote Antenna Unit space time block coding Zero Forcing Error Vector Magnitude

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Analytical Evaluation of Post Processing SIR for Spatial Diversity Modes in Cellular Systems 10

Analytical Evaluation of Post Processing SIR for Spatial Div...

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International Conference on Signal Processing and Communications (SPCOM)

作者： Parida, Priyabrata Das, Suvra Sekhar Indian Inst Technol Kharagpur GS Sanyal Sch Telecommun Kharagpur 752069 W Bengal India

ISBN: (纸本)9781479946655

This work characterizes the statistical distribution of the post processing Signal to Interference Ratio (SIR) for a multi-cellular system employing different spatial diversity modes such as receive-maximal ratio combining, space time block coding, and closed loop singular value decomposition based beamforming. The framework used for analysis considers the combined effect of distance dependent pathloss, shadowing, and small scale fading. It is shown that for all the above mentioned spatial modes the post processing SIR for a single link follows lognormal distribution. Furthermore, the downlink SIR of a cell with uniform user distribution has been evaluated semi-analytically. All the analytically obtained results are validated through extensive Monte Carlo simulations.

关键词： Approximation methods Base stations Interference Random variables Shadow mapping Spatial diversity Vectors spatial diversity Shadow mapping BASE STATION Approximation method Random variable space time block coding POST-PROCESSING cellular system User distribution Monte Carlo technique Signal to interference ratio interference

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Combining Spatial Modulation and VBLAST/STBC for Correlated Rayleigh Fading Channels: Capacity and Performance Analysis

Combining Spatial Modulation and VBLAST/STBC for Correlated ...

引用

International Conference on Wireless Communications and Signal Processing (WCSP)

作者： Liu, Hong Zheng, Jianping Li, Ying Xidian Univ State Key Lab Integrated Serv Networks Xian 710071 Peoples R China

ISBN: (纸本)9781479903085

In this paper, two novel multiple-antenna schemes where the spatial modulation (SM) is combined with the space-time block coding Gsmo and the vertical Bell Laboratories layered space-time (VBLAST) architecture, respectively, are presented for correlated Rayleigh fading channels. The capacities of the proposed schemes are first analyzed and then the union bounds of the average error probability are derived. From the analytical and simulation results, the proposed SM-STBC and SM-VBLAST schemes can achieve transmit diversity gain and higher spectral efficiency, respectively, compared with the conventional SM scheme. Furthermore, both the proposed schemes are more robust to the transmit channel correlation than the conventional SM scheme.

关键词： Rayleigh fading Raleigh fading channels Error probability space time block coding Samarium Scheme Bell Labs SPATIAL MODULATION V-BLAST

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Incremental-Relaying Cooperative-Networks using Dual Transmit Diversity and Decode and Forward Relaying Scheme with Best Relay Selection.

Incremental-Relaying Cooperative-Networks using Dual Transmi...

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37th International Convention on Information and Communication Technology, Electronics and Microelectronics (MIPRO)

作者： Hayajneh, Ali M. Khodeir, Mahmoud Al-Mistarihi, Mamoun F.

ISBN: (纸本)9789532330816

A new incremental-relaying cooperative-diversity technique with a simple dual transmit diversity, decode-and-forward and best relay selection scheme is presented. Closed-form expressions for the the bit error rate, the signal to noise ratio outage probability, and average achievable rate are derived using binary phase shift keying modulation scheme over independent nonidentical Rayleigh fading channels. The results show that the simple space time block coding scheme with the incremental-relaying cooperative diversity and best relay selection outperforms the regular incremental fixed cooperative diversity and saves resources.

关键词： Rayleigh fading adaptive relaying incremental-relaying maximal ratio combining error performance outage probability space time block coding

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A Unified MIMO Architecture Subsuming space Shift Keying, OSTBC, BLAST and LDC

A Unified MIMO Architecture Subsuming Space Shift Keying, OS...

引用

IEEE 72nd Vehicular Technology Conference Fall 2010

作者： Sugiura, Shinya Chen, Sheng Hanzo, Lajos Univ Southampton Sch ECS Southampton SO17 1BJ Hants England

ISBN: (纸本)9781424435746

In this paper, motivated by the recent concept of Spatial Modulation (SM), we propose a novel Generalized space-time Shift Keying (G-STSK) architecture, which acts as a unified Multiple-Input Multiple-Output (MIMO) framework. More specifically, our G-STSK scheme is based on the rationale that P out of Q dispersion matrices are selected and linearly combined in conjunction with the classic PSK/QAM modulation, where activating P out of Q dispersion matrices provides an implicit means of conveying information bits in addition to the classic modem. Due to its substantial flexibility, our G-STSK framework includes diverse MIMO arrangements, such as SM, space-Shift Keying (SSK), Linear Dispersion Codes (LDCs), space-time block Codes (STBCs) and Bell Lab's Layered space-time (BLAST) scheme. Hence it has the potential of subsuming all of them, when flexibly adapting a set of system parameters. Moreover, we also derive the Discrete-input Continueous-output Memoryless Channel (DCMC) capacity for our G-STSK scheme, which serves as the unified capacity limit, hence quantifying the capacity of diverse MIMO arrangements. Furthermore, EXtrinsic Information Transfer (EXIT) chart analysis is used for designing our G-STSK scheme and for characterizing its iterative decoding convergence.

关键词： system parameter Developing Countries multiple input multiple output systems shift keying blasts blight space time block coding

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An Adaptive Conditional Zero-Forcing Decoder with Full-diversity, Least Complexity and Essentially-ML Performance for STBCs

An Adaptive Conditional Zero-Forcing Decoder with Full-diver...

引用

International Symposium on Information Theory and its Applications (ISITA)

作者： Natarajan, Lakshmi Prasad Rajan, B. Sundar IISc Dept ECE Bangalore 560012 Karnataka India

ISBN: (纸本)9784885522673

A low complexity decoding technique with an essentially-ML performance for the Golden code and the 3 antenna Perfect code was introduced by Sirianunpiboon, Howard & Calderbank. Though no theoretical analysis of the decoder was given, the simulations showed that this decoding technique has almost maximum-likelihood (ML) performance. Inspired by this technique, in this paper we introduce two new low complexity decoders for space-time block Codes (STBCs) - the Adaptive Conditional Zero-Forcing (ACZF) decoder and the ACZF decoder with successive interference cancellation (ACZF-SIC), which include as a special case the decoding technique of Sirianunpiboon et al. We show that both ACZF and ACZF-SIC decoders are capable of achieving full-diversity under Rayleigh fading, and we give sufficient conditions for an STBC to give full-diversity with these decoders. We then show that the Golden code, the 3 and 4 antenna Perfect codes, the 3 antenna Threaded Algebraic space-time code and the 4 antenna rate 2 code of Srinath & Rajan are all full-diversity ACZF/ACZF-SIC decodable with complexity strictly less than that of their ML decoders. Simulations show that the proposed decoding method performs identical to ML decoding for all these five codes. These STBCs along with the proposed decoding algorithm outperform all known codes in terms of both decoding complexity and error performance for N-t <= 4 transmit antennas. We further provide a lower bound on the complexity of full-diversity ACZF/ACZF-SIC decoding. The proposed decoders for all the five codes listed above achieve this lower bound and hence are optimal in terms of minimizing the ACZF/ACZF-SIC decoding complexity.

关键词： decoders DEcoding space time block coding Codes Computer Programming Languages Complexity decoding algorithm ANTENNA antennae simulating error performance

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Performance Enhancement of Cognitive Radio Spectrum Sharing (CRSS) with MIMO System

Performance Enhancement of Cognitive Radio Spectrum Sharing ...

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International Conference on Computing, Communication and Security (ICCCS)

作者： Kale, Pranil Sunil Lohiya, Padma DY Patil Coll Engn Pune Maharashtra India

ISBN: (纸本)9781467393546

关键词： Spectrum sharing cognitive radio multiuser diversity space time block coding

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