OFDM系统中PSAM M-QAM的导引符号功率的优化

陈继明; 唐友喜; 李少谦

OFDM系统中PSAM M-QAM的导引符号功率的优化

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出版历程
- 收稿日期: 2004-08-30
- 修回日期: 2005-02-16
- 刊出日期: 2006-04-19

Analysis and Optimization of Pilot-Symbol-Assisted- Modulation M-QAM for OFDM Systems

摘要

摘要: 该文分析了多径衰落信道下OFDM系统中导引符号辅助相干解调(PASM)M-QAM的导引符号功率对解调性能的影响，优化了导引符号与数据符号功率比，计算了不精确信道估计造成性能的损失。分析和仿真结果表明，最优导引符号功率与数据符号的功率之比由信噪比、多普勒频率和内插滤波器系数等因素决定。当采用最优的比值时，为达到相同的误比特率，所需的发射总功率最低。
- 正交频分复用;导引符号辅助调制;导引数据功率比;多进制幅度调制;误码率
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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参考文献(1)

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