摘要
针对估计相移键控(PSK)信号的码速率时需要构建多维矩阵从而导致计算复杂度高的问题,提出首先使用循环自相关的一维切片估计信号载频,然后根据载频的估计值构造相关接收机,使用相关接收机得到码元宽度的粗估计结果后,以此作为循环自相关计算的延迟值并以此缩小循环频率计算区间,从而得到码速率的精确估计结果。此方法的运算复杂度低,操作简单,能够获得载频及码速率的精确估计结果,且适用于低信噪比的情况。分析了此方法的运算复杂度,并通过仿真实验对该估计方法进行了验证,实验结果证实了方法的有效性。
The calculation complexity is high due to multi-dimension matrix construction when the code rate of phase-shift keying （PSK） signals is estimated,so this paper presents a method,which firstly uses one-dimension slice of the cyclic autocorrelation for signal to estimate the carrier frequency of signals,then a correlation receiver is obtained according to the estimated parameters of carrier frequency. After the code rate is estimated roughly by using the correlation receiver, the rate is taken as the delay value of the cyclic autocorrelation and the interval of the cycle frequency can be lessened,thereby the accurate estimation of the code rate can be obtained. The complication of this method is low,and the method is simple in operation,accurate in estimation and effective for situations of low signal to noise ratio （SNR）. This paper analyzes the computation complexity of this method, validates the estimation method through simulation experiment, and the experiment result verifies the effectiveness of this method.
出处
《舰船电子对抗》
2017年第6期83-86,共4页
Shipboard Electronic Countermeasure
关键词
循环自相关
相关接收机
码速率
cyclic autocorrelation
correlation receiver
code rate
