一种频偏条件下新的Chirp-BOK分数域解调方法  

New chirp-BOK demodulation method in fractional Fourier domain under frequency offset conditions

作　　者：宁晓燕 聂毅帆 孙志国 王秋滢[1] NING Xiaoyan;NIE Yifan;SUN Zhiguo;WANG Qiuying(College of Information and Communication Engineering, Harbin Engineering University, Harbin 150001, China)

机构地区：[1]信息与通信工程学院哈尔滨工程大学,黑龙江哈尔滨150001

出　　处：《哈尔滨工程大学学报》2021年第5期703-709,共7页Journal of Harbin Engineering University

基　　金：国家自然科学基金项目(62001138);中国博士后科学基金项目(2020M670885);黑龙江省博士后专项经费(LBH-Z20049).

摘　　要：为了解决频偏条件下Chirp-BOK调制的传统解调方法性能下降的问题,本文提出了一种峰值搜索-分数域非相干解调方法,将传统的固定频点采样扩展为区域峰值搜索。首先将码同步误差、多普勒频移、收发端接收机参数误差等统一为Chirp信号频率的偏移,分析了传统解调方法克服频率偏移时的不足。然后对该解调方法在AWGN信道和频偏条件下与传统方法进行对比,理论推导和仿真证明:该方法在频偏条件下具有更好的误码率性能。This study proposes a peak search noncoherent demodulation method in the fractional domain to solve the performance degradation of the traditional demodulation methods for chirp-BOK modulation under frequency offset conditions.Regional peak search is used instead of the traditional fixed frequency sampling.First,the code synchronization error,Doppler frequency shift,and receiver parameter error are unified as the chirp signal frequency offset.The shortcomings of traditional demodulation methods under frequency offset conditions are also analyzed.Second,the new demodulation method is compared with traditional methods under AWGN channel and frequency offset conditions.Theoretical derivation and simulation prove that the new method achieves satisfactory BER performance under frequency offset conditions.

关 键 词：扩频通信 Chirp-BOK调制 分数域Fourier变换 定点采样 频率偏移 峰值搜索 

分 类 号：TN911.6[电子电信—通信与信息系统]