Compress-And-Forward Cooperative Relaying in MIMO-OFDM Systems

In this paper, we investigate the capacity of compress-and-forward (C&F) cooperative relaying scheme when the C&F relay operates in time division duplex (TDD). In our evaluation we consider MIMO-OFDM transmission. An achievable rate was previously derived in (A. Host-Madsen et al., 2005) assuming scalar channel. We extend this Wyner-Ziv bound to MIMO-OFDM, by applying results from Bayesian vector estimation and rate-distortion coding theory. Then we derive the mutual information of a sub-optimum relaying scheme in which the relay applies Karhunen-Loeve transform to the signal received from the source before quantizing it and forwarding it to the destination as a new codeword. Finally, we illustrate by simulations (in an environment similar to IEEE 802.16) the fact that for some scenarios, the C&F approach outperforms other known relaying techniques. This remains true even if the C&F sub-optimum scheme is considered

[1]  Philippe J. Sartori,et al.  Error prediction for adaptive modulation and coding in multiple-antenna OFDM systems , 2006, Signal Process..

[2]  Abbas El Gamal,et al.  Capacity theorems for the relay channel , 1979, IEEE Trans. Inf. Theory.

[3]  J. Wolfowitz The rate distortion function for source coding with side information at the decoder. II , 1979 .

[4]  Zixiang Xiong,et al.  Wyner-Ziv coding for the half-duplex relay channel , 2005, Proceedings. (ICASSP '05). IEEE International Conference on Acoustics, Speech, and Signal Processing, 2005..

[5]  Aaron D. Wyner,et al.  The rate-distortion function for source coding with side information at the decoder , 1976, IEEE Trans. Inf. Theory.

[6]  P. Lapostolle Collection Technique et Scientifique des Télécommunications , 1978 .

[7]  Helmut Bölcskei,et al.  On the capacity of OFDM-based spatial multiplexing systems , 2002, IEEE Trans. Commun..

[8]  J. Salo,et al.  An interim channel model for beyond-3G systems: extending the 3GPP spatial channel model (SCM) , 2005, 2005 IEEE 61st Vehicular Technology Conference.

[9]  Aria Nosratinia,et al.  Cooperative communication in wireless networks , 2004, IEEE Communications Magazine.

[10]  Thomas M. Cover,et al.  Elements of Information Theory , 2005 .

[11]  Adrian Agustin,et al.  Non-regenerative MIMO relaying with channel state information [cellular example] , 2005, Proceedings. (ICASSP '05). IEEE International Conference on Acoustics, Speech, and Signal Processing, 2005..

[12]  Michael Gastpar,et al.  Cooperative strategies and capacity theorems for relay networks , 2005, IEEE Transactions on Information Theory.

[13]  T. Moon,et al.  Mathematical Methods and Algorithms for Signal Processing , 1999 .

[14]  Emre Telatar,et al.  Capacity of Multi-antenna Gaussian Channels , 1999, Eur. Trans. Telecommun..

[15]  Anders Høst-Madsen,et al.  Capacity bounds and power allocation for wireless relay channels , 2005, IEEE Transactions on Information Theory.