OFDM系统中相干解调<i>M</i>-PSK的导引符号功率优化

OFDM系统中相干解调M-PSK的导引符号功率优化

基金项目:

国家863计划资助项目,编号:2001AA123013;国家自然科学基金,编号:60272009

详细信息

摘要: 在多径衰落信道下,分析了采用M-PSK的相干解调正交频分复用系统中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引起的系统性能的损失。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。当采用最优功率比值时,为达到相同的误比特率,所需的总发射功率最小。
- 正交频分复用 /
- 导引符号辅助调制 /
- 导引数据功率比 /
- 衰落信道
Abstract: 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 M-PSK in orthogonal frequency division multiplexing systems. The pilot-to-data power ratio is optimized analytically, and the loss due to imperfect channel estimation is calculated. Theoretical and simulation results show that the optimum pilot-to-data power ratio is affected by the signal-to-noise ratio, Doppler frequency and interpolation size etc. Once the optimization parameter of pilot-to-data power ratio is used, system transmission power is minimum while still meeting the fixed bit error rate target.
- orthogonal frequency division multiplexing /
- pilot symbol assisted modulation /
- pilot-to-data power ratio /
- fading channel