Opportunistic scheduling with quantized feedback in wireless networks

Wireless scheduling algorithm can extract multiuser diversity (MUDiv) via prioritizing the users with best current channel condition. One drawback of MUDiv is the required feedback carrying the instantiations channel rate from all active users to the access point base station. This paper shows that this feedback load is, for the most part, unjustified. To alleviate this problem, we propose an optimal discrete rate switch-based multi-user diversity system (DSMUDiv) that allows reducing the feedback load while preserving the essential of the scheme performance. We examine DSMUDiv scheme using an absolute signal-to-noise ratio (SNR)-based scheduling mechanism, assuming all users are independent identical distributed (i.i.d.). We provide a theoretical analysis of the feedback load and the spectral efficiency for the DSMUDiv scheme and compare it with the optimal (full feedback load) selective diversity scheme. Slow Rayleigh fading is assumed. Our results show a reduction in the feedback load.

[1]  Mohamed-Slim Alouini,et al.  Performance analysis of multiuser selection diversity , 2004, 2004 IEEE International Conference on Communications (IEEE Cat. No.04CH37577).

[2]  Ove Edfors,et al.  The effect of feedback quantization on the throughput of a multiuser diversity scheme , 2003, GLOBECOM '03. IEEE Global Telecommunications Conference (IEEE Cat. No.03CH37489).

[3]  A. Hanks.  Canada , 2002 .

[4]  Laurence B. Milstein,et al.  Multiuser diversity-mobility tradeoff: modeling and performance analysis of a proportional fair scheduling , 2002, Global Telecommunications Conference, 2002. GLOBECOM '02. IEEE.

[5]  Paul Douglas,et al.  Proceedings International Conference on Information Technology: Coding and Computing , 2002, Proceedings. International Conference on Information Technology: Coding and Computing.

[6]  David Tse,et al.  Opportunistic beamforming using dumb antennas , 2002, IEEE Trans. Inf. Theory.

[7]  R. Laroia,et al.  Opportunistic beamforming using dumb antennas , 2002, Proceedings IEEE International Symposium on Information Theory,.

[8]  Hong-Chuan Yang,et al.  Multiuser switched diversity transmission , 2004, IEEE 60th Vehicular Technology Conference, 2004. VTC2004-Fall. 2004.

[9]  Robert W. Heath,et al.  Adaptive modulation and MIMO coding for broadband wireless data networks , 2002, IEEE Commun. Mag..

[10]  Mohamed-Slim Alouini,et al.  Adaptive Modulation over Nakagami Fading Channels , 2000, Wirel. Pers. Commun..

[11]  R. Elliott.  A measure of fairness of service for scheduling algorithms in multiuser systems , 2002, IEEE CCECE2002. Canadian Conference on Electrical and Computer Engineering. Conference Proceedings (Cat. No.02CH37373).

[12]  Mohamed-Slim Alouini,et al.  How much feedback is multi-user diversity really worth? , 2004, 2004 IEEE International Conference on Communications (IEEE Cat. No.04CH37577).