四种超宽带扩频方案的电磁兼容性能研究
doi: 10.3724/SP.J.1146.2010.00659
Research on the Electromagnetic Compatibility of Four Ultra-wideband Spread Spectrum Schemes
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摘要: 由于保护距离有限，在满足功率谱密度限制的条件下超宽带信号仍然可能对其它通信系统产生一定的干扰。该文在直接序列扩频、跳时扩频、跳频扩频和线性调频扩频4种超宽带扩频信号通过AWGN信道时，推导了在超宽带扩频信号干扰下未扩频的其它通信系统误比特率的通用表达式，并通过蒙特卡罗仿真验证了理论推导的正确性。同时还给出了超宽带扩频信号通过IEEE 802.15.3a CM4信道时的仿真结果。这些结论为超宽带系统的电磁兼容性能评价和扩频方案选择提供了重要参考。Abstract: As the protection distance is limited, ultra-wideband signals may still interfere another communication system even with the satisfaction of the power spectral density limit. This paper derives the common expressions of bit error rate of another communication system without spread spectrum under the interference of the four ultra-wideband spread spectrum signals which pass through AWGN channel, and the four ultra-wideband spread spectrum schemes are direct sequence spread spectrum, time-hopping spread spectrum, frequency-hopping spread spectrum and chirp spread spectrum. The derived expressions are validated by Monte Carlo simulations. Also provided here are the simulation results obtained when ultra-wideband spread spectrum signals pass through IEEE 802.15.3a CM4 channel. The conclusions can be used as important references for the electromagnetic compatibility performance evaluation and the selection of spread spectrum schemes of ultra-wideband systems.
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