积分判决的高效协同信号调制解调方法

刘晨¹, 沙学军¹, 张文彬¹, 陈叶菁²

(1.哈尔滨工业大学 通信技术研究所, 150001 哈尔滨; 2. 空军第二通信团, 95880 部队)



摘要:

为了解决传统调制方式误码率和谱效率互相制约的问题,设计了一种以余弦信号和线性调频信号为载波的高效协同信号调制解调方式． 在调制端,在传统的正交相移键控（ＱＰＳＫ）调制的两信号上各增加一路线性调频信号进行混频调制,从原有的两路信号传输变成四路信号同时传输；在解调端,通过载波信号的组合,设计了8个积分器,对积分后结果通过比较取最大值,以此对信号进行判决． 仿真结果表明：这种信号调制解调方式的误码率和比特通过率较传统调制方式均有改善．说明本文设计的信号调制解调方式在误码率与谱效率之间取得综合优势,提升了系统有效容量．

关键词:  线性调频信号  调制解调  误码率  协同传输

DOI：10.11918/j.issn.0367-6234.2015.03.005

分类号:TN911

基金项目:国家自然科学基金(61171110).



An efficient signal modulation and demodulation method based on integral judgments

LIU Chen¹, SHA Xuejun¹, ZHANG Wenbin¹, CHEN Yejing²

(1.Communication Research Center,Harbin Institute of Technology, 150001 Harbin,China; 2. Air force 2nd communication regiment, 95880 troops, China)

Abstract:

In order to solve the problem that the BER and spectral efficiency restrict each other in the traditional modulation methods, we design a novel signal modulation and demodulation method where the cosine signal and the chirp signal are used as carriers to transmit cooperatively. In the modulation, each signal of the traditional QPSK modulation is inserted by a chirp signal to form the mix modulation. In this case, the new modulation will permit the four signals to transmit simultaneously; In the demodulation, consisting of the carrier signals, we design eight integrators. Moreover, the signals will be estimated by the maximum value of integral results. Numerical results imply that this modulation and demodulation method improves both BER and the bit pass rate.It means that the modulation and demodulation method we design in this paper obtains the comprehensive advantages between BER and spectral efficiency, and enhances the effective capacity of the system.

Key words:  chirp signal  modulation and demodulation  the BER performance  cooperative transmission