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Published October 2011 | public
Journal Article

Optimum Power and Rate Allocation for Coded V-BLAST: Instantaneous Optimization

Abstract

Several instantaneous optimization strategies for rate and/or power allocation in the coded V-BLAST are studied analytically. Outage probabilities and system capacities of these strategies in a spatial multiplexing system are compared under generic settings. The conventional waterfilling algorithm is shown to be suboptimal for the coded V-BLAST and a new algorithm ("fractional water-filling") is proposed, which simultaneously maximizes the system capacity and minimizes the outage probability. Closed-form performance analysis of the considered algorithms is given, and the fractional water-filling algorithm is shown to attain the full MIMO channel diversity, significantly outperforming other strategies. Many of the results also apply to generic multi-stream transmission systems (e.g. spatial multiplexing on the channel eigenmodes, OFDM) or the systems relying on successive interference cancelation (multi-user detection, channel equalization).

Additional Information

© 2011 IEEE. Paper approved by N. Al-Dhahir, the Editor for Space-Time, OFDM and Equalization of the IEEE Communications Society. Manuscript received August 9, 2010, revised March 19, 2011. The paper was presented in part at the IEEE International Conference on Communications, Dresden, Germany, June 2009 [18].

Additional details

Created:
August 19, 2023
Modified:
October 17, 2023