MSK信号误码性能分析

Error Performances of MSK Signal

本文首先分析MSK信号在受到噪声干抗及码间干扰情况下的误码性能。分析结果表明,MSK信号因载波相位误差而造成的误码性能恶化介于BPSK与QPSK之间。其次,分析了位定时抖动对误码率的影响。最后,指出在存在码间干抗与加性高斯噪声的情况下,为减小系统的误码率,解调器前窄带滤波器的带宽(双边)B≈1.2/T_b。

The error performances of MSK signal under noise and intersymbol interference are analysed. The results illustrate that the deterioration of error performances of MSK signal caused by false carrier phase is between that of BPSK and QPSK. Secondly, the effects of the jitter of bit-timing on error performances are discussed. Finally, in order to decrease the error performances of whole system, the authors point oub that under the circumstances of intersymbol interference and additive Gaussian noise, the bandwidth (double-side) of narrowband filter before demodulator is B≈1.2/T_b.