基于Chirp组合信号调制的多址技术

Multiple Access Technology Based on Chirp Composite Signal Modulation

为了最大程度降低多址干扰对系统性能的影响,提出了一种新的基于Chirp组合信号调制的多址技术。在充分利用系统带宽的情况下,结合调频率和初始相位设计一组正交性较好的多址信号来抑制用户间的多址干扰,进而提高系统的误码率性能。仿真结果表明,在不显著牺牲系统性能的情况下,利用Chirp组合信号调制的多址技术可以容纳更多用户同时接入系统;与基于二进制正交键控调制的多址技术相比,系统误码率性能至少提高5 d B以上。

In order to improve the bit error rate performance of multiple access systems, a multi access technique based on Chirp combined signal modulation is proposed. In the full use of the characteristics of the system bandwidth, a set of orthogonal signals with good orthogonality is designed with the combination of frequency and initial phase, which can reduce the multiple access interference. And the advantages of adjusting the parameters of Chirp signal in constructing multiple access signals are analyzed and deduced. Simulation results show that ,in the case of no significant sacrifice of system performance, the use of Chirp combined signal modulation of the multi access technology can accommodate more users to access system. Compared to the multiple access technique based on binary orthogonal keying modulation, the system error rate performance is improved at least 5 dB.