A Power Adaptation Method for Finite Length Block Fading Channel with Multiple Antennas

Chen JI
Jiang WU
Dongming WANG
Xiaohu YOU

IEICE TRANSACTIONS on Communications   Vol.E96-B    No.12    pp.3041-3049
Publication Date: 2013/12/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E96.B.3041
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Fundamental Theories for Communications
power adaptation,  water filling,  block fading,  finite block length,  MIMO,  

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We analyze a power adaptation method to maximize the achievable rate under the finite block length regime, for MIMO block fading channel with channel state information available at both the transmitter and receiver side. We find a convex approximation to the lower bound of the achievable rate, and it leads to a simple power and rate adaptation method. We show that the method achieves near optimal channel rate under the finite block length regime. Compared to the classical waterfilling method, the proposed method can further improve achievable rate especially for short block lengths.