相位误差对信干比估计性能的影响

通过使用概率密度函数估计的方法,得出CDMA系统解扩后基带信号近似服从高斯分布。因此,CDMA系统信干比估计可以采用高斯白噪声条件下BPSK调制基带信号的信噪比估计方法。在此基础上,通过理论分析和计算机仿真,比较存在相位误差情况下三种信干比估计方法的性能。仿真结果表明,基于二阶矩和四阶矩的估计方法M2M4不受相位误差的影响,适合工程应用。

Performance Analysis of SIR Estimation Techniques with Phase Error

This paper deduces that the probability density function(pdf) of the baseband signal in code division multiple access(CDMA) communication system is nearly gaussian by using the method of pdf estimation. Therefore, the signal to interference ratio(SIR) estimation can use the method of signal to noise ratio(SNR) estimation techniques for binary phase-shift keying(PSK) signals in additive white gaussian noise(AWGN). A comparison of the performance of four SIR estimation techniques with the phase error has deduced by using analyze and simulation. The result of computer simulation shows that the M2M4 method which based on second-and fourth-order moments ( M2M4)estimation is less sensitive to phase error and it is suitable for engineering applications.