Beamforming and bit-loading strategies for multi-user SDMA with admission control

In this paper, we address the problem of transmit beamforming, power allocation, bit loading, and admission control in a multi-user scenario, where several single antenna mobile terminals are served by one base station equipped with an antenna array. In particular, we explore the impact of using either optimal or zero-forcing transmit beamforming schemes in combination with different bit allocation strategies, namely the maximization of the sum rate (MSR), the maximization of the minimum rate (MMR) and a modified version of the latter, for a finite set of modulation schemes. The performance evaluation is conducted by means of system-level simulations, using a realistic channel model for urban micro cells, with an emphasis not only on the aggregated cell throughput but also on the associated fairness issues

[1]  L. C. Godara,et al.  Handbook of Antennas in Wireless Communications , 2001 .

[2]  迪克·胡斯·哈托格斯.  Ensemble modem structure for imperfect transmission media , 1986 .

[3]  Raymond Knopp,et al.  Information capacity and power control in single-cell multiuser communications , 1995, Proceedings IEEE International Conference on Communications ICC '95.

[4]  Raj Jain,et al.  A Quantitative Measure Of Fairness And Discrimination For Resource Allocation In Shared Computer Systems , 1998, ArXiv.

[5]  Holger Boche,et al.  Solution of the multiuser downlink beamforming problem with individual SINR constraints , 2004, IEEE Transactions on Vehicular Technology.

[6]  A.I. Perez-Neira,et al.  Multiuser spatial scheduling in the downlink of wireless systems , 2004, Processing Workshop Proceedings, 2004 Sensor Array and Multichannel Signal.

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

[8]  Zhu Han,et al.  Throughput maximization using adaptive modulation in wireless networks with fairness constraint , 2003, 2003 IEEE Wireless Communications and Networking, 2003. WCNC 2003..

[9]  Björn E. Ottersten,et al.  System evaluation of optimal downlink beamforming with congestion control in wireless communication , 2006, IEEE Transactions on Wireless Communications.

[10]  Pekka Kyosti,et al.  MATLAB implementation of the 3GPP spatial channel model (3GPP TR 25.996) , 2005 .

[11]  D. B. Calvo.  Fairness Analysis of Wireless Beamforming Schedulers , 2005 .

[12]  Leandros Tassiulas,et al.  Transmit beamforming and power control for cellular wireless systems , 1998, IEEE J. Sel. Areas Commun..

[13]  Philip A. Whiting,et al.  The use of diversity antennas in high-speed wireless systems: capacity gains, fairness issues, multi-user scheduling , 2001 .

[14]  Shlomo Shamai,et al.  On the achievable throughput of a multiantenna Gaussian broadcast channel , 2003, IEEE Transactions on Information Theory.