A Virtual Layered Space-Frequency Receiver Architecture with Iterative Decoding

In this paper, a novel receiver architecture is proposed for multiple-input-multiple-output (MIMO) systems; the proposed architecture helps achieve superior performance in multipath fading channels when the number of layered streams exceeds the number of receiving antennas. In this architecture, the concept of “virtual channel” is adopted to attain diversity gain even when successive detection is applied for reducing computational complexity, while orthogonal frequency division multiplexing (OFDM) is employed to combat multipath fading. Actually, successive detection is carried out in all possible virtual channels, and the virtual channel with the minimum error probability is detected with the assistance of the maximum a-posteriori (MAP) decoder in the architecture. In addition, soft input and soft output (SISO) iterative detection is introduced in the virtual channel estimation scheme. The performance of the proposed architecture is verified by computer simulations. This architecture can be implemented with lesser complexity than that in maximum likelihood detection (MLD), but the gain in the former case exceeds that in the latter by 4.5dB at the BER of 10-3 for 4×2 MIMO-OFDM.

[1]  Pascal Chevalier,et al.  Widely linear estimation with complex data , 1995, IEEE Trans. Signal Process..

[2]  R. V. Nee,et al.  Maximum likelihood decoding in a space division multiplexing system , 2000, VTC2000-Spring. 2000 IEEE 51st Vehicular Technology Conference Proceedings (Cat. No.00CH37026).

[3]  Toshihiko Nishimura,et al.  High data-rate transmission with eigenbeam-space division multiplexing (E-SDM) in a MIMO channel , 2002, Proceedings IEEE 56th Vehicular Technology Conference.

[4]  Marco Lops,et al.  Widely linear reception strategies for layered space-time wireless communications , 2006, IEEE Transactions on Signal Processing.

[5]  W. van Etten,et al.  Maximum Likelihood Receiver for Multiple Channel Transmission Systems , 1976, IEEE Trans. Commun..

[6]  Alexander Lampe,et al.  Asymptotic analysis of widely linear MMSE multiuser detection-complex vs real modulation , 2001, Proceedings 2001 IEEE Information Theory Workshop (Cat. No.01EX494).

[7]  M. J. Gans,et al.  On Limits of Wireless Communications in a Fading Environment when Using Multiple Antennas , 1998, Wirel. Pers. Commun..

[8]  Daisuke Umehara,et al.  A Virtual Layered Space Time Receiver with Maximum Likelihood Channel Detection , 2009, VTC Spring 2009 - IEEE 69th Vehicular Technology Conference.

[9]  Satoshi Denno,et al.  V-BLAST detection algorithms with real weight vector for spatial multiplexing , 2008 .

[10]  Gerard J. Foschini,et al.  Layered space-time architecture for wireless communication in a fading environment when using multi-element antennas , 1996, Bell Labs Technical Journal.

[11]  Hiroyuki Kawai,et al.  Adaptive control of surviving symbol replica candidates in QRM-MLD for OFDM MIMO multiplexing , 2006, IEEE Journal on Selected Areas in Communications.

[12]  Reinaldo A. Valenzuela,et al.  V-BLAST: an architecture for realizing very high data rates over the rich-scattering wireless channel , 1998, 1998 URSI International Symposium on Signals, Systems, and Electronics. Conference Proceedings (Cat. No.98EX167).