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Performance evaluation of adaptive OFDM systems in time-varying channels

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4 Author(s)
Haixia Zhang ; Sch. of Inf. Sci. & Eng., Shandong Univ., China ; Dongfeng Yuan ; Ci Song ; Xinying Gao

One of advantages of the OFDM transmission technique is that it has the inherent flexibility to adapt the modulation scheme on each subcarrier according to the signal-to-noise ratio (SNR) on the subcarrier, leading to an adaptive OFDM (AOFDM) system. We proposed a coded AOFDM system in a time-varying channel. By choosing an optimal M-QAM modulation scheme used by a subcarrier on the instantaneous channel knowledge, we extensively investigate the bit-error-rate (BER) performances of AOFDM systems with different vehicle speeds, modulation schemes and bit rates under Rayleigh fading channels.

Published in:

Communications, Circuits and Systems, 2004. ICCCAS 2004. 2004 International Conference on  (Volume:1 )

Date of Conference:

27-29 June 2004