摘要
研究了相位噪声对QPSK系统的性能影响,利用高斯信道下带有相位噪声的条件误码率公式,分析了不同相位噪声谱所带来的解调损失。相位调制是一种恒包络调制方式,它对调制信号的相位偏移非常敏感,在单频相位噪声模型基础上,把相位噪声功率谱密度与相干解调的误码率公式相联系起来,计算了高斯信道条件下不同相位噪声谱对不同速率QPSK信号的解调损失。
This paper studies the QPSK demodulation performance with phase noise characterized by its power spectrum density.According to the conditional symbol error rates of QPSK,demodulation penalty with different phase noise spectral shape is derived.QPSK is a kind of constant envelope modulation,of which the signal envelope is not as sensitive as its phase.Based on the model of single frequency phase noise,the phase noise represented by its power spectral shape and the symbol error rates of coherent demodulation are connected together.Then the effect of phase noise on demodulation performance over a Gauss channel is analyzed.The experimental result shows the demodulation penalty of different phase noise spectral shape and different symbol rate.
出处
《通信技术》
2010年第4期65-66,69,共3页
Communications Technology
基金
国家自然科学充分利用空间资源的无线通信传输理论(批准号:60496313)
