Variable and Fixed Power Adaptive Turbo Coded Modulation for OFDM Transmissions

Xiaoming SHE  Anchun WANG  Shidong ZHOU  Yan YAO  

IEICE TRANSACTIONS on Communications   Vol.E87-B    No.6    pp.1710-1714
Publication Date: 2004/06/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technology
adaptive modulation and coding (AMC),  turbo coded modulation,  OFDM,  

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In this letter, we propose an adaptive turbo coded modulation scheme for orthogonal frequency division multiplexing (OFDM), and three power allocation algorithms with transmit power variable over subcarriers, variable over subbands and constant over subcarriers. Our object is to improve the overall throughput under target bit-error-rate (BER). Simulation results show that our fixed power adaptation scheme exhibits a more than 7 dB signal-noise-ratio (SNR) gain relative to non-adaptive turbo coded modulation, and an about 2 dB additional gain can be achieved with our variable power algorithm employed. We also discuss the effect of the number of subbands on throughput performance in our adaptive scheme.