基于信号波形协同提高无线通信系统容量的研究

针对有限频谱资源与迅速增长业务需求的矛盾,提出了一种基于信号波形协同的无线通信技术。在传统正弦载波通信系统的基础上,在相同的频谱范围内利用正弦信号和线性调频信号在频域和分数域能量积聚特性的对偶关系在正弦载波通信信号上叠加线性调频信号波形来传输不同的用户信息,并在接收端分别通过频域和分数域滤波处理实现两类用户信号波形的分别提取,从而达到提高频谱效率和增加系统容量的目的。建立了系统模型,给出了理论分析,并进行了数值验证。研究结果表明,在传统正弦载波通信体制的基础上,通过信号波形协同和变换域滤波处理可以有效地提高频谱效率,理论上能够将系统容量提升近一倍。

Increasing capacity for wireless communication systems based on signal waveform collaboration

A wireless communication technology based on signal waveform collaboration was proposed for resolving the conflict between limited spectrum resources and the rapidly growing service needs.The proposed technology employs linear frequency modulation(LFM) signals to transmit different users’ information by utilizing the dual relationship be-tween the energy concentration property of sinusoidal signals and that of LFM signals in the frequency and fractional domains,and the transmitted signals are superimposed on communication waveforms of the traditional sinusoidal carrier communication system on the same frequency band.At the receiver,frequency-and fractional-domain filters are applied to separate two kinds of users’ signals.Moreover,the system model of the proposed technology is constructed,and theo-retical analysis is also derived.The validity of the theoretical derivations is demonstrated via simulations.It has been shown that spectral efficiency can be effectively improved using signal waveform collaboration and transform-domain filtering.Theoretically,the proposed technology can achieve twice system capacity as large as that of the traditional si-nusoidal carrier communication system.