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| Analysis and Optimization of Pilot-Symbol-Assisted-
Modulation M-QAM for OFDM Systems |
| Chen Ji-ming; Tang You-xi; Li Shao-qian |
| National key Lab of Communication of UESTC, Chengdu 610054, China |
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Abstract In this paper, the current analysis focuses on the influence of demodulation performance in multipath fading propagation environments, which results from the pilot power variation of Pilot Symbol Assisted Modulation (PSAM) M-QAM in Orthogonal Frequency Division Multiplexing (OFDM) systems. The Pilot-to-Data power Ratio (PDR) is optimized analytically, and the loss due to imperfect channel estimation is calculated. Theoretical and simulation results show that the optimum PDR is effected by the Signal-to-Noise Ratio (SNR), Doppler frequency and interpolation size etc. When the optimization parameter of PDR is used, the power of system transmission is the minimum but the same bit error rate (BER) is obtained.
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Received: 30 August 2004
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2006, Vol. 28 
