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Capacity analysis of MIMO MRC systems in correlated rayleigh fading environments

WIRELESS PERSONAL COMMUNICATIONS 2007年第4期43卷 1569-1576页

作者： Rui, Xianyi Jin, Rongliong Geng, Junping Shanghai Jiao Tong Univ Sch Elect Informat & Elect Engn Dept Elect Engn Shanghai 200240 Peoples R China

In this paper, we analyze the capacity of multiple-input multiple-output systems employing maximal ratio combining under Rayleigh fading environments in the presence of spatial fading correlation at the transmitter or receiver. Based on statistical properties of the largest eigenvalue of correlated complex Wishart matrices, the exact closed-form expressions for the cumulative distribution function and the probability density function of the output signal-to-noise ratio are presented. The results are used to analyze the outage and ergodic capacities of the systems. The analysis shows that ergodic capacity improves with the increase of the channel correlation coefficient and the analytical results are validated by Monte Carlo simulations.

关键词： multiple-input multiple-output maximal ratio combining outage capacity ergodic capacity correlated Rayleigh fading

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MIMO broadcast scheduling with limited feedback

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IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS 2007年第7期25卷 1457-1467页

作者： Zhang, Wei Ben Letaief, Khaled Hong Kong Univ Sci & Technol Dept Elect & Comp Engn Kowloon Hong Kong Peoples R China

We consider multiuser scheduling with limited feedback of partial channel state information in MIMO broadcast channels. By using spatial multiplexing at the base station (BS) and antenna selection for each user, we propose a multiuser scheduling method that allocates independent information streams from all M transmit antennas to the M most favorable users with the highest signal-to-interference-plus-noise ratio (SINR). A close approximation of the achievable sum-rate throughput for the proposed method is obtained and shown to match the simulation results very well. Moreover, two reduced feedback scheduling approaches are proposed. In the first approach, which we shall refer to as selected feedback scheduling, the users are selected based on their SINR compared to a predesigned threshold. Only those selected users,are allowed to feed back limited information to the BS. The resultant feedback load and achievable throughput are derived. It will then be demonstrated that with a proper choice of the threshold, the feedback load can be greatly reduced with a negligible performance loss. The second reduced feedback scheduling approach employs quantization for each user, in which only few bits of quantized SINR are fed back to the BS. Performance analysis will show that even with only 1-bit quantization, the proposed quantized feedback scheduling approach can exploit the multiuser diversity at the expense of slight decrease of throughput.

关键词： antenna selection broadcast channel feedback multiple-input multiple-output multiuser diversity

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Optimization-theoretic analysis of stability-optimal transmission policy for multiple-antenna multiple-access channel

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IEEE TRANSACTIONS ON SIGNAL PROCESSING 2007年第6期55卷 2688-2702页

作者： Boche, Holger Wiczanowski, Marcin Tech Univ Berlin Dept Elect Engn & Comp Sci Heinrich Hertz Chair Mobile Commun Technol D-10587 Berlin Germany

The philosophy of scheduler design in modern wireless data networks exposes the tendency towards layer-spanning optimization (cross-layer design). An important particular goal of joint design of the physical and (data) link layer appears to be the achievement of the entire stability region of the network. In this work, we provide the optimization-theoretic analysis of the corresponding policy, referred to as stability-optimal policy, in the multiple-antenna multiple-access channel. We characterize some useful features of the policy. In particular, we state the conditions for optimality of link subset transmission and expose essential differences to the established scheduling approaches, such as sumrate maximization. This further allows for the statement of necessary and sufficient conditions for the overall stability optimality of successive interference cancellation order. Finally, we present the approach of splitting of the multilink stability problem into the set of single-link optimization problems. We propose a corresponding iterative optimization method, which is an extension of the known concept of iterative waterfilling from [1].

关键词： multiple-access channel (MAC) multiple-input multiple-output stability successive interference cancellation (SIC)

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On the diversity-multiplexing tradeoff for wireless cooperative multiple access systems

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IEEE TRANSACTIONS ON SIGNAL PROCESSING 2007年第9期55卷 4627-4638页

作者： Ding, Zhiguo Ratnarajah, T. Cowan, Colin C. F. Queens Univ Belfast Inst Elect Commun & Informat Technol Belfast BT3 9DT Antrim North Ireland

A spectrally efficient strategy is proposed for cooperative multiple access (CMA) channels in a centralized communication environment with N users. By applying superposition coding, each user will transmit a mixture containing its own information as well as the other users', which means that each user shares parts of its power with the others. The use of superposition coding in cooperative networks was first proposed in [11], which will be generalized to a multiple-user scenario in this paper. Since the proposed CMA system can be seen as a precoded point-to-point multiple-antenna system, its performance can be best evaluated using the diversity-multiplexing tradeoff. By carefully categorizing the outage events, the diversity-multiplexing tradeoff can be obtained, which shows that the proposed cooperative strategy can achieve larger diversity/multiplexing gain than the compared transmission schemes at any diversity/multiplexing gain. Furthermore, it is demonstrated that the proposed strategy can achieve optimal tradeoff for multiplexing gains 0 <= r <= 1 whereas the compared cooperative scheme is only optimal for 0 <= r <= (1/N). As discussed in the paper, such superiority of the proposed CMA system is due to the fact that the relaying transmission does not consume extra channel use and, hence, the deteriorating effect of cooperative communication on the data rate is effectively limited.

关键词： channel capacity cooperative communications diversity-multiplexing tradeoff multiple-input multiple-output (MIMO) systems outage probability superposition coding

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Construct MIMO process control system by using soft computing methods

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INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY 2007年第5-6期33卷 511-520页

作者： Jiang, Jui-Chin Hsiao, Feng-Yuan Chung Yuan Christian Univ Dept Ind Engn Chungli 32023 Taiwan

The main objective of this study aims at multiple-input multiple-output ( MIMO) process mode. Based on the integrated concepts of statistical process control (SPC) and engineering process control (EPC), soft computing (SC) technique and statistical analysis technique are combined to modularize the relationship between process output and process input, so optimal yield can be derived and process quality can be improved. This study intended to construct a MIMO process control system with soft computing methods for prediction and parameter control and detailed the internal operation for each subsystem and relationship among one another. Besides correct prediction and diagnosis for the noise due to system deviation, it effectively controls process input and output as well as achieves process optimization.

关键词： engineering process control multiple-input multiple-output soft computing statistical process control

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Efficient algorithm for blind detection of orthogonal space-time block codes

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IEEE SIGNAL PROCESSING LETTERS 2007年第5期14卷 301-304页

作者： Le, Minh-Tuan Pham, Van-Su Mai, Linh Yoon, Giwan Informat & Commun Univ Sch Engn Taejon 305714 South Korea

This letter proposes an efficient decoder for signal detection in orthogonal space-time block coded systems employing phase-shift keying modulation without channel state information at the receiver. The proposed decoder consists of a sphere decoder and a QRD-based decoder. Simulation results show that the proposed decoder enables the system to trade off performance improvement against complexity.

关键词： diversity maximum likelihood detection multiple-input multiple-output space-time coding wireless communication

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On the capacity of orthogonalised correlated MIMO channels under different adaptive transmission techniques

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IET COMMUNICATIONS 2007年第3期1卷 464-471页

作者： Musavian, L. Nakhai, M. R. Kings Coll London Ctr Telecommun Res London WC2R 2LS England

Orthogonal space-time block codes (STBCs) are known to orthogonalise the multiple-input multiple-output (MIMO) wireless channel, thus reducing the space-time vector detection to a simpler scalar detection problem. The capacity of STBCs over correlated Rayleigh and Ricean flat-fading MIMO channels under different adaptive transmitting techniques is studied. Three adaptive schemes known as optimal power and rate allocation, total channel inversion with fixed rate policy and its truncated variant are studied. Taking into account the effect of channel correlation, closed-form expressions are obtained for the capacity of orthogonalised Rayleigh and Ricean MIMO channels under these adaptive transmission techniques in order to avoid Monte-Carlo simulations.

关键词： block codes scalar detection problem MIMO communication adaptive codes channel capacity rate allocation wireless channel Rayleigh channels channel allocation multiple-input multiple-output Rayleigh-Ricean flat-fading channel Rician channels STBC orthogonal codes channel inversion channel coding space-time codes adaptive transmission technique space-time block code orthogonalized correlated MIMO channel

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A novel approach to analyzing V-BLAST MIMO systems with two transmit antennas

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IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS 2007年第5期6卷 1591-1595页

作者： Xu, Rongtao Lau, Francis C. M. Hong Kong Polytech Univ Dept Elect & Informat Engn Hong Kong Peoples R China

A novel approach to analyzing the performance of the V-BLAST multi-input multi-output systems with two transmit antennas is presented in this letter. Based on the properties of Wishart matrices, we derive the exact SNR distributions in the first and second detection steps when optimal detection ordering is used. Closed-form analytical expressions for the bit error rates are then given. The effect of optimal ordering on the diversity order and SNR is evaluated. The results are found to be consistent with those previously published by other researchers.

关键词： multiple-input multiple-output optimal detection ordering vertical BLAST Wishart distribution zero-forcing

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Capacity of MIMO-OFDM systems in spatially correlated indoor fading channels

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IET COMMUNICATIONS 2007年第3期1卷 514-519页

作者： Kafle, P. L. Sesay, A. B. McRory, J. Telecommun Res Lab Calgary AB T2L 2K7 Canada

multiple-input multiple-output (MIMO) wireless systems provide significantly higher capacity compared to the conventional single antenna systems in rich scattering environments. However, the real capacity advantage in a specific channel environment strongly depends on its propagation characteristics. We analyse the capacity of orthogonal frequency division multiplexing-based spatial multiplexing system for indoor fading channels. We model the channel between the transmitter and receiver arrays by considering two indoor propagation models, the extended Saleh-Valenzuela (ESV) model and the geometrically based single bounce elliptical model (GBSBEM). Spatial correlation matrices for the realisations of the ESV and GBSBEM are obtained for the wideband MIMO fading channels, which are then used for the evaluation of mutual information and outage capacity using Monte-Carlo simulations. The behaviour of capacity against outage is investigated for different physical parameters and array geometries. Capacity results are discussed with similar power delay profiles, antenna spacing and angular spreads for uniform linear and circular arrays.

关键词： fading channels spatially correlated indoor fading channels MIMO communication MIMO-OFDM systems GBSBEM models geometrically based single bounce elliptical model indoor radio Monte-Carlo simulations propagation characteristics spatial correlation matrices capacity channel capacity multiple-input multiple-output orthogonal frequency division multiplexing-based spatial multiplexing system mutual information ESV model OFDM modulation indoor propagation wideband channels extended Saleh-Valenzuela model

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Performance analysis of MIMO MRC systems in the presence of self-interference and co-channel interferences

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IEEE SIGNAL PROCESSING LETTERS 2007年第11期14卷 801-803页

作者： Rui, Xianyi Jin, Ronghong Geng, Junping Shanghai Jiao Tong Univ Dept Elect Engn Shanghai 200240 Peoples R China

Both self-interference (SI), which is caused by imperfect channel estimation, and co-channel interference (CCI) are considered in multiple-input multiple-output systems employing maximal ratio combining under independent and identically distributed Rayleigh fading. Closed-form expressions for probability density function and outage probability of output signal-to-interfer ence plus noise ratio are presented. Numerical results are used to evaluate the impact of SI and CCI.

关键词： co-channel interference maximal ratio combining multiple-input multiple-output outage probability self-interference

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