Optimal resource allocation and leaky bucket based power control for CBR MIMO systems

Supporting high-quality video transmission across wireless networks demands not only high but also constant bit rate (CBR). In order to provide a CBR channel, large modifications in transmitting power requirement would normally be necessary to inverse extremely high variation in channel fading. However, with a multiple input and multiple output (MIMO) system, sub-channel diversity can "smooth out" aggregate channel fluctuation, making it possible to support a CBR channel with efficient power control. We have devised an optimal antenna transmitting power and bits-per-symbol allocation algorithm that can reduce significantly, the total power consumption required to maintain CBR channels. We also utilize a secondary power control based on leaky bucket paradigm for smooth battery drain and to make peak power utilization to within system requirements. Simulation results reveal that under practical power fluctuation constraints, the scheme can achieve power savings of up to 10 dB with a 4/spl times/4 antenna system.

[1]  Chen-Nee Chuah,et al.  Capacity of multi-antenna array systems in indoor wireless environment , 1998, IEEE GLOBECOM 1998 (Cat. NO. 98CH36250).

[2]  Hideki Imai,et al.  A Spread-Spectrum Multiaccess System with Cochannel Interference Cancellation for Multipath Fading Channels , 1993, IEEE J. Sel. Areas Commun..

[3]  John M. Cioffi,et al.  Spatio-temporal coding for wireless communications , 1996, Proceedings of GLOBECOM'96. 1996 IEEE Global Telecommunications Conference.

[4]  Hang Liu,et al.  Delay and synchronization control middleware to support real-time multimedia services over wireless PCS networks , 1999, IEEE J. Sel. Areas Commun..

[5]  John M. Cioffi,et al.  Spatio-temporal coding for wireless communication , 1998, IEEE Trans. Commun..

[6]  Andrea J. Goldsmith,et al.  Variable-rate variable-power MQAM for fading channels , 1997, IEEE Trans. Commun..

[7]  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).

[8]  Wenjun Luo,et al.  Quality Control for VBR Video over ATM Networks , 1997, IEEE J. Sel. Areas Commun..

[9]  Jack H. Winters,et al.  Smart antennas for wireless systems , 1998, IEEE Wirel. Commun..

[10]  Hang Liu,et al.  Performance of H.263 Video Transmission over Wireless Channels Using Hybrid ARQ , 1997, IEEE J. Sel. Areas Commun..

[11]  Khaled Ben Letaief,et al.  Successive interference cancellation for multiuser asynchronous DS/CDMA detectors in multipath fading links , 1998, IEEE Trans. Commun..

[12]  Antonio Ortega,et al.  Joint Encoder and VBR Channel Optimization with Buffer and Leaky Bucket Constraints , 1996 .

[13]  Richard D. Gitlin,et al.  The impact of antenna diversity on the capacity of wireless communication systems , 1994, IEEE Trans. Commun..