一种多带多chirp基调制解调技术  

Technique of modulation and demodulation based on multi-carrier and multi chirp-basis

作　　者：肖绵合 郑霖[1] 杨超[1] Xiao Mianhe;Zheng Lin;Yang Chao(Key Laboratory of Wideband Wireless Communications & Signal Processing,Guilin University of Electronic Science & Technology,Guilin Guangxi 541004,China)

机构地区：[1]桂林电子科技大学广西无线宽带通信与信号处理重点实验室

出　　处：《计算机应用研究》2019年第7期2130-2133,共4页Application Research of Computers

基　　金：国家自然科学基金资助项目(61571143,61371107);通信网信息传输与分发技术重点实验室开放课题(KX172600033)

摘　　要：多带线性调频二进制开关键控(chirp-BOK)调制是在线性调频(chirp)信号基础上合成的,其传统的检测方案匹配滤波法存在非相关项自干扰问题,在子带个数较多或chirp基的时带宽积较小情况下误码性能较差。建立了一种多带chirp信号的数学模型并提出一种简易的调制流程。基于该模型,采用最小二乘法解决了匹配滤波法自干扰问题,相比于匹配滤波法具有较好的信干噪比增益。更进一步地,通过分析多带chirp-BOK技术缺陷提出一种多带多chirp基调制技术(MMCM)。MMCM技术可以灵活地调整码率与扩频增益之间的关系。仿真表明,扩频增益为0dB情况下,MMCM与OFDM技术有相同频带利用率;对于MMCM的信源组个数为J与时带宽积为P的情况,系统处理增益为P/J。The multi-band chirp-BOK modulation is based on chirp signal,which has problem of non-related items self-interference in traditional detection scheme which is matching filtering method(MF).The MF has lower bit error rate performance in the case of a larger number of sub-bands or smaller chirp-based bandwidth.This paper established a mathematical model with multi-band chirp signals and proposed a simple modulation workflow based on the model,it could use the least square(LS) method to solve the self-interference problem of matched filter.LS method could provide a better SNR gain compared with the MF.Further,it proposed a multi-band multi-chirp-based modulation technique (MMCM) by analyzing the multi-band chirp-BOK technique.MMCM technology could flexibly adjust the relationship between code rate and spread-spectrum gain.MMCM had the same frequency band utilization as OFDM technology with spread spectrum gain of 0 dB.For the case that the number of source groups of MMCM is J and the time-bandwidth product is P,the system processing gain is P/J .

关 键 词：多带chirp-BOK MMCM技术 线性调频基 

分 类 号：TN928[电子电信—通信与信息系统]