Subchannel Power Control in the OFDM System to Improve BER Performance under Multipath Channels

Hongku KANG  Wooncheol HWANG  Kiseon KIM  

IEICE TRANSACTIONS on Communications   Vol.E85-B   No.5   pp.902-907
Publication Date: 2002/05/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Wireless Communications Issue)
orthogonal frequency division multiplexing (OFDM),  subchannel power control,  wireless LAN,  bit error rate (BER),  

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We propose a subchannel power control scheme in the OFDM system, which transmits data with a variable power level for each subchannel based on the received SNR. The OFDM system, employing the D-QPSK modulation and the proposed subchannel power control with a grouping coefficient equal to 3, gives about 2.3 dB gain in Eb/N0 comparing with the conventional OFDM system, under the two-ray multipath channel with the mean value of the second-ray's attenuation coefficient equal to 0.25, for the required BER equal to 10-5.