摘要
针对通信对抗领域中二进制连续相位调制(Continuous Phase Modulation,CPM)信号的符号速率盲估计问题,提出了一种基于循环谱和内插法的符号速率估计方法。该方法利用信号带宽对符号速率进行初步估计,以确定循环谱的计算区间和谱峰的搜索区间;接着采用一种新形式的基于单侧频移的离散频域平滑法来计算循环相关谱,并结合内插法对谱峰搜索结果进行校正,进一步提高符号速率的估计精度。理论分析结果表明,该方法在相同条件下可将栅栏效应的缝隙间隔缩小至原来的1/2。计算机仿真结果表明,在信噪比大于-3 dB时,同其他两种已有算法相比,该方法符号速率估计的归一化均方误差至少下降10^(-1)。
In order to achieve the blind symbol rate estimation of binary continuous phase modulation(CPM)signal in the field of communication countermeasure,a symbol rate estimation method based on cyclic spectrum and interpolation is proposed.The symbol rate is initially estimated using the calculated bandwidth of signal,which is used to determine the calculation interval and the search interval of the cyclic spectrum.Then the cyclic correlation spectrum is calculated by a new discrete frequency domain smoothing method based on one-sided frequency-shift,and the peak search result is corrected by interpolation method to further improve the estimation accuracy of the symbol rate.It’s proved by theoretical analysis that this method can reduce the gap of the barrier effect to half of the original one under the same conditions.Computer simulation results show that,compared with other two existing algorithms,the normalized mean square error of the symbol rate estimation of this method is reduced by at least 10^(-1) when the signal-to-noise ratio is morn than-3 dB.
作者
王旭
王春燕
王文静
魏国华
WANG Xu;WANG Chunyan;WANG Wenjing;WEI Guohua(School of Information and Electronics,Beijing Institute of Technology,Beijing 100081,China;Shanghai Radio Equipment Research Institute,Shanghai 201109,China)
出处
《电讯技术》
北大核心
2021年第12期1496-1502,共7页
Telecommunication Engineering
基金
国家自然科学基金资助项目(61671059)。
关键词
二进制连续相位调制
符号速率估计
循环谱
内插法
binary continuous phase modulation
symbol rate estimation
cyclic spectrum
interpolation method
