一种新型消息驱动跳频系统及其性能分析  

A new message-driven frequency hopping system and its performance analysis

作　　者：宁晓燕[1] 宁宇 孙志国[1] 彭爽 王秋滢[1] NING Xiaoyan;NING Yu;SUN Zhiguo;PENG Shuang;WANG Qiuying(College of Information and Communication Engineering, Harbin Engineering University, Harbin 150001, China)

机构地区：[1]哈尔滨工程大学信息与通信工程学院,黑龙江哈尔滨150001

出　　处：《哈尔滨工程大学学报》2020年第9期1384-1390,共7页Journal of Harbin Engineering University

基　　金：国家自然科学基金项目(51879046);中央高校基本科研业务费专项资金项目(201749).

摘　　要：为了提高常规跳频系统的频谱效率,近年来消息驱动型跳频技术被提出。它采用信息序列代替伪随机序列选择跳频频点,调制效率大幅提升,其代价是接收端需要全频带接收以判断跳频点位置,解调复杂度较高,同时系统性能受衰落信道的影响较大。为了解决消息驱动跳频实现复杂度过高的问题,本文提出一种基于IFFT/FFT架构的新型消息驱动跳频系统,并在该架构下设计了一种新型OG-2FSK映射方式,对该调制方式在高斯白噪声信道和多普勒频移信道下的理论误码率公式进行了推导。仿真结果验证了公式推导的正确性,并表明在多普勒频移信道下,所提出的OG-2FSK映射方式比传统的BPSK具有更好的误码率性能。The Message-driven frequency hopping(MDFH)MDFH system adopts an information sequence instead of a pseudo-random sequence to select the frequency hopping point.Thus,the modulation efficiency is greatly improved.However,its disadvantage is that demodulation is complex because the receiving end needs full-band reception to determine the position of frequency hopping point,and the system performance is greatly affected by fading channels.A new MDFH system based on IFFT/FFT architecture is proposed in this paper to reduce the complexity of MDFH system.Furthermore,a new mapping method named orthogonal grouped binary frequency shift keying(OG-2FSK)is designed under this architecture.In addition,the theoretical bit error rate(BER)formula of OG-2FSK is derived in additive white Gaussian noise and Doppler shift channels.Simulation results prove the validity of the formula derivation and indicate that OG-2FSK has a better BER performance than binary phase-shift keying in Doppler shift channels.

关 键 词：快速傅里叶变换 OFDM 跳频同步 高斯白噪声 误码率伪随机序列 调制效率 

分 类 号：TN911.6[电子电信—通信与信息系统]