| OFDM系统中相干解调M-PSK的导引符号功率优化 |
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| 引用本文： | 陈继明,唐友喜,李少谦.OFDM系统中相干解调M-PSK的导引符号功率优化[J].电子科技大学学报(社会科学版),2003(5). |
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| 作者姓名： | 陈继明 唐友喜 李少谦 |
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| 作者单位： | 电子科技大学通信抗干扰技术国家级重点实验室，电子科技大学通信抗干扰技术国家级重点实验室，电子科技大学通信抗干扰技术国家级重点实验室 成都 610054，成都 610054，成都 610054 |
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| 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 |
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| 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。
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| 关 键 词： | 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 |
Analysis and Optimization of Pilot-Symbol-Assisted M-PSK for OFDM Systems |
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| Chen Timing Tang Youxi Li Shaoqian.Analysis and Optimization of Pilot-Symbol-Assisted M-PSK for OFDM Systems[J].Journal of University of Electronic Science and Technology of China(Social Sciences Edition),2003(5). |
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| Authors: | Chen Timing Tang Youxi Li Shaoqian |
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| 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. |
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| Keywords: | orthogonal frequency division multiplexing pilot symbol assisted modulation pilot-to-data power ratio fading channel |
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