PSK伪码速率估计

在电子侦察中码速率参数没有先验知识,因此需要对其进行估计。本文提出了一种BPSK(B inary phase-sh ift key ing)和QPSK(Q uadrature phase-sh ift key ing)相位编码信号的码速率估计方法。首先估计信号的载频和初相,然后由估计的参数构造相关接收机,相关接收机的输出在相位跳变处出现拐点,利用拐点之间的距离进行码元宽度估计。仿真结果表明,本方法比H aar小波变换法性能好,尤其在信噪比低于7 dB时,仍然具有较好的性能。对31位M序列,信噪比在0 dB时,均方根误差接近0.01。

Symbol Rate Estimation of Phase Shift Keying

A method for the symbol rate estimation is used to estimate the symbol rate of the binary phase shift keying(BPSK) and quadrature phase-shift keying (QPSK) signals.The carrier frequency and the phase are estimated firstly,and then a receiver with the estimated parameters is obtained.Spinodals appear at the jump of the phase in the output signal,and the symbol rate is estimated by using the distance of the adjacent spinodals.When the method is used to demodulate PSK signals,there needs no consider the synchronization problem.The method can be applied to the radar electronic countermeasure.The performance of the estimator is better than that of the Haar wavelet symbol rate estimator when R_(SN)(signal-to-noise ratio) is smaller than 7 dB.RMSE(root-mean-square error) of BPSK is closed to 0.01 when R_(SN)is 0 dB for the number of symbols is 31.