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IEEE International Conference on Communications (ICC 2008)

作者： Zhao, Hongzhi Gong, Yi Guan, Yong Liang Li, Shaoqian Univ Elect Sci & Technol China Natl Key Lab Commun Chengdu 610054 Peoples R China Nanyang Technol Univ Position & Wireless Technol Ctr Sch Elect & Elect Engn Singapore Singapore

ISBN: (纸本)9781424420742

In certain multiple-input multiple-output (MIMO) fading environments, the offered channel capacity can be very low even when the MIMO channels are uncorrelated;this effect has been termed as keyhole or pinhole effect. In this paper, we present rigorous error rate analysis of orthogonal space time block codes in Nakagami-m keyhole channels with arbitrary fading parameters. Using a moment-generation-function based approach, we provide the exact expressions of symbol error rate. Furthermore, the closed-form asymptotic expressions are derived, based on which one can easily quantify the diversity gain of the considered system with arbitrary m-fading parameters while existing methods in literature fail to do so. Simulation results are also provided to verify our analytical results.

关键词： space-time block code Rayleigh fading keyhole MIMO symbol error rate diversity gain

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A Derivation on the Equivalence Between Newton's Method and DF DFT-Based Method for Channel Estimation in OFDM Systems

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IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS 2008年第10期7卷 3982-3987页

作者： Ku, Meng-Lin Huang, Chia-Chi Natl Chiao Tung Univ Dept Commun Engn Hsinchu 300 Taiwan

In this paper, we derive the decision-feedback (DF) discrete Fourier transform (DFT)-based channel estimation method from Newton's method for space-time block code (STBC)/orthogonal frequency division multiplexing (OFDM) systems. Through our derivation, the equivalence between Newton's method and the DF DFT-based method is established. Computer simulations are also used to demonstrate the equivalence of the two methods in terms of BER and normalized square error (NSE) performance. Finally, the results presented in this paper also hold for conventional OFDM systems.

关键词： Orthogonal frequency division multiplexing space-time block code discrete Fourier transform channel estimation Newton's method decision-feedback

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Performance evaluation of high rate space-time trellis-coded modulation using Gauss-Chebyshev quadrature technique

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IET COMMUNICATIONS 2008年第5期2卷 658-663页

作者： Sokoya, O. Xu, H. J. Takawira, F. Univ KwaZulu Natal Sch Elect Elect & Comp Engn ZA-4041 Durban South Africa

The performance analysis of high rate space-time trellis-coded modulation (HR-STTCM) using the Gauss-Chebyshev quadrature technique is presented. HR-STTCM is an example of space-time codes that combine the idea used in trellis coded modulation (TCM) design that is signal set expansion and set partitioning into its construction. HR-STTCM construction is based on the concatenation of an outer TCM encoder and inner space-time block code. This paper evaluates the exact pairwise error probability of HR-STTCM based on the Gauss-Chebyshev quadrature formula. Comparison of numerical and simulation results shows that the proposed method is accurate. The method used is shown to be computationally simpler than those in the literature.

关键词： high rate space-time trellis-coded modulation block codes space-time codes performance evaluation integration Gauss-Chebyshev quadrature technique signal set expansion space-time block code trellis coded modulation signal set partitioning error statistics pairwise error probability

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Adaptive switching technique for space-time/frequency coded OFDM systems

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IEICE TRANSACTIONS ON COMMUNICATIONS 2008年第2期E91B卷 633-636页

作者： Chang, Namseok Gil, Gye-Tae Kang, Joonhyuk Yu, Gangyoul Informat & Commun Univ Sch Engn Taejon South Korea Korea Telecom Res Ctr Taejon South Korea Samsung Elect Co Ltd Telecommun R&D Ctr Syst Lab 4G Suwon South Korea

In this letter, a switched transmission technique is presented that can provide the orthogonal frequency division multiplexing (OFDM) systems with additional diversity gain. The space-time block coding (STBC) and space-frequency block coding (SFBC) are considered for the transmission of the OFDM signals. A proper coding scheme is selected based on the estimated normalized delay spread and normalized Doppler spread. The selection criterion is derived empirically. It is shown through computer simulations that the proposed switching technique can improve the bit error rate (BER) performance of an OFDM system when the corresponding wireless channel has some time variation of time selectivity as well as frequency selectivity.

关键词： OFDM space-time block code space-frequency block code

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Performance Analysis on LDPC-coded Systems over Quasi-Static (MIMO) Fading Channels

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IEEE TRANSACTIONS ON COMMUNICATIONS 2008年第12期56卷 2080-2093页

作者： Zhang, Jingqiao Lee, Heung-No Univ Pittsburgh Dept Elect & Comp Engn Pittsburgh PA 15260 USA

In this paper, we derive closed form upper bounds on the error probability of low-density parity-check (LDPC) coded modulation schemes operating on quasi-static fading channels. The bounds are obtained from the so-called Fano-Gallager's tight bounding techniques, and can be readily calculated when the distance spectrum of the code is available. In deriving the bounds for multiple-input multiple-output (MIMO) systems, we assume the LDPC code is concatenated with the orthogonal space-time block code as an inner code. We obtain an equivalent single-input single-output (SISO) channel model for this concatenated coded-modulation system. The upper bounds derived here indicate good matches with simulation results of a complete transceiver system over Rayleigh and Rician MIMO fading channels in which the iterative detection and decoding algorithm is employed at the receiver.

关键词： Tight union bounds LDPC codes space-time block code MIMO systems quasi-static fading channels

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Design of New Quasi-Orthogonal STBC with Minimum Decoding Complexity for Four Transmit Antennas

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IEICE TRANSACTIONS ON COMMUNICATIONS 2008年第10期E91B卷 3368-3370页

作者： Chae, Changhyeon Jung, Taejin Hwang, Intae Chonnam Natl Univ Kwangju South Korea

A new space-time block code (STBC) achieving full rate and full diversity for general QAM and four transmit antennas is proposed. This code also possesses a quasi-orthogonal (QO) property like the conventional Minimum Decoding Complexity QO-STBC (MDC-QO-STBC), leading to joint ML detection of only two real symbols. The proposed code is shown to exhibit the identical error performance with the existing MDC-QO-STBC. However. the proposed code has an advantage in transceiver implementation since this code can be modified so that I e increase of PAPR occurs on only two transmit antennas. whereas MDC-QO-STBC incurs a PAPR increase on all transmit antennas.

关键词： multiple antennas space-time block code

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Widely linear filter bank equalizer for real STBC

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IEEE TRANSACTIONS ON SIGNAL PROCESSING 2008年第9期56卷 4544-4548页

作者： Pun, Ka Shun Carson Nguyen, Truong Q. Texas Instruments Inc San Diego CA 92121 USA Univ Calif San Diego Dept Elect & Comp Engn La Jolla CA 92093 USA

In this correspondence, we propose a widely linear (WL) filter bank (FB) equalizer for a real space-time block code (RSTBC) employed in a frequency-selective multiple-input-multiple-output (MIMO) channel with additive circular symmetric complex Gaussian noise. We consider a M-t-transmitting antenna (Tx)-M-r-receiving antenna (Rx) communications system with the receiver employing widely linear processing (WLP). We then analyze the perfect reconstruction (PR) condition for the induced virtual MIMO channel by WLP. Furthermore, through reducing the rate of the RSTBC, the communications system becomes a nonmaximally decimated Fill which potentially leads to better equalization. Simulation results using various code rates show the proposed FB widely linear equalizer (WLE) performs better than the non-WL version.

关键词： equalization space-time block code widely linear equalization

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Joint channel estimation and symbol detection for space-time block code

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Journal of Systems Engineering and Electronics 2004年第3期15卷 266-269页

作者：单淑伟罗汉文宋文涛 DepartmentofElectronicEngineering ShanghaiJiaotongUniversityShanghai200030P.R.China

The simplified joint channel estimation and symbol detection based on the EM (expectation-maximization) algorithm for space-time block code (STBC) are proposed. By assuming channel to be invariant within only one STBC word and utilizing the orthogonal structure of STBC, the computational complexity and cost of this algorithm are both very low, so it is very suitable to implementation in real systems.

关键词： space-time block code expectation-maximization algorithm channel estimation symbol detection.

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Performance of adaptive coding by selection of space-time block code matrix

Performance of adaptive coding by selection of space-time bl...

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60th IEEE Vehicular Technology Conference

作者： Niida, SL Inoue, T Takeuchi, Y KDDI Corp Mobile Commun Lab Chiyoda Ku Tokyo 1028460 Japan

ISBN: (纸本)0780385217

The 3rd generation mobile communication systems are currently spreading throughout the world and high speed data services on mobile systems such as streaming video, streaming audio and video phone are being widely utilized by the public at large. As higher speed rate services are infiltrated, the provision of wider band wireless systems is expected. MIMO (Multiple Input, Multiple Output) systems, which equip several antennas with both a transmitter and receiver, have recently been attracting much attention. space-time coding is a technique that exploits transmission diversity and achieves high performance under a fading environment. The space-time block code is attracting particular attention for its high performance and decoding simplicity. We propose an adaptive coding scheme method using the space-time block code. It changes the space-time block coding pattern and the modulation symbol according to the receiving condition. In this paper, we discuss this scheme and evaluate its throughput and transmission power performances based on simulation results using on ideal propagation environments and measured data in the experiment.

关键词： space-time block code adaptive coding adaptive modulation real tranmission environment

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A two-stage partially adaptive linear receiver for CDMA MIMO systems with Alamouti's space-time block codes

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DIGITAL SIGNAL PROCESSING 2007年第1期17卷 244-260页

作者： Yu, Jung-Lang Hung, Chih-Lung Lee, I-Ting Fu Jen Catholic Univ Dept Elect Engn Hsunchuang 24205 Taipei Hsien Taiwan

The code-division multiple-access (CDMA) multiple-input multiple-output (MIMO) systems with Alamouti's space-time block codes (STBC) have been widely investigated for the great demand of capacities and transmission rates in the future wireless communication systems. The semi-blind Capon multiuser receiver is designed to achieve the goal by the usage of linearly constrained minimum variance (LCMV) filters. However, the Capon receiver suffers finite samples and signature vector errors. In this paper, we propose a novel two-stage receiver containing partially adaptive linear filters in parallel followed by the channel estimator and symbol detector. Two transformation schemes based on subspace techniques are designed in the partially adaptive linear filters. The channel estimation is executed after the partially adaptive linear filter where the computational complexity is saved considerably. A performance enhancement method is introduced by using the forward-back ward averaging technique. According to the weighting analysis, we also present a simplified two-stage receiver with lower complexity. Furthermore, the diagonal-loading (DL) technique based on the worse-case performance optimization is often used to alleviate the drawbacks of Capon receiver. In the end, we apply the proposed the forward-backward averaging technique and the weighting analysis onto the DL-based Capon receivers. Computer simulations are given to demonstrate the effectiveness of the two-stage partially adaptive linear receivers for the CDMA MIMO systems with Alamouti's STBC schemes and the performance improvement of the DL-based Capon receivers with the forward-backward averaging technique and the weighting analysis. (c)\ 2006 Elsevier Inc. All rights reserved.

关键词： space-time block code capon receiver LCMV filter CDMA forward-backward averaging technique diagonal loading

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