多元位置相移键控调制功率谱的优化
doi: 10.3724/SP.J.1146.2012.01259
On Power Spectrum Optimization of M-ary Position PSK Modulations
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摘要: 该文针对影响多元位置相移键控(MPPSK)调制信号功率谱旁瓣电平的离散线谱杂散，分析出MPPSK调制信号的频谱特性，找出了线谱分布规律，提出了波形优化法和多元满位置法来抑制MPPSK功率谱中的线谱杂散；设计了两类不同的解调器对两种功率谱优化了的MPPSK信号进行解调；从功率谱特性和解调性能方面，对两种方法进行了仿真验证和分析；结果表明，优化后的调制信号功率谱旁瓣电平低，线谱杂散被抑制，-40 dB带宽分别被紧缩了73.72%和43.72%，相同误码率指标下，波形优化法解调所需信噪比要比多元满位置法节省0.3~0.7 dB，表明了这两种方法在功率谱优化中的可行性和有效性。
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关键词:
- 无线通信 /
- 多元位置相移键控调制 /
- 线谱抑制 /
- 带宽紧缩 /
- 功率谱优化
Abstract: Aimed at the discrete components affecting power spectrum sideband level, the spectral properties of the M-ary Position Phase Shift Keying (MPPSK) modulated signal is derived. The waveform optimization and full M-ary position is proposed to suppress these discrete spectral components. Two demodulators to adapt the optimized MPPSK signals are designed and simulated. The theoretical analysis and experimental results show that the discrete components are greatly suppressed with these two methods and the spectrum utilization is enhanced, the -40 dB bandwidth is tightened up by a factor of 73.72% and 43.72% respectively. 0.3~0.7 dB in signal to noise ratio at the same bit error rate is saved for waveform optimization demodulation than for full M-ary position demodulation which demonstrates the feasibility and validity of these two methods. -
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