Broadcast space-time coding

Mahsa Memarzadeh; Ashutosh Sabharwal; Behnaam Aazhang

doi:10.1117/12.434446

27 July 2001 Broadcast space-time coding

Mahsa Memarzadeh, Ashutosh Sabharwal, Behnaam Aazhang

Proceedings Volume 4531, Modeling and Design of Wireless Networks; (2001) https://doi.org/10.1117/12.434446
Event: ITCom 2001: International Symposium on the Convergence of IT and Communications, 2001, Denver, CO, United States

Abstract

In this paper, we study transmission techniques for broadcast channels with a single transmitter and multiple receivers. The transmitter is assumed to be equipped with multiple antennas. Further, each receiver is interested only in part of the transmitted information. Using Gaussian code based information theoretic bounds, we analyze two transmit beamforming techniques. The first technique, zero-forcing beamformer, uses the channel information for all users to send spatially orthogonal signals to different users, i.e., no user receives interference from the other user signals. The second method uses the single-user optimal beamformer with no effort to reduce interference at the receivers. It is shown that the above transmit beamforming techniques are similar to multiuser receivers used in non-orthogonal CDMA systems. In particular, the zero-forcing beamformer is similar to a decorrelating detector and the single-user beamformer is identical to a matched filter. The comparison with CDMA multiuser receivers is strengthened by results on spectral efficiency of proposed beamformers, which follow the behavior of decorrelating and matched-filter receiver.

Citation Download Citation

Mahsa Memarzadeh, Ashutosh Sabharwal, and Behnaam Aazhang "Broadcast space-time coding", Proc. SPIE 4531, Modeling and Design of Wireless Networks, (27 July 2001); https://doi.org/10.1117/12.434446

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