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鉴于上行线性调频与下行线性调频信号在实际中的交叠和非完全正交而导致的互相关干扰,设计了基于脉冲位置调制的线性调频扩频超宽带无线通信系统。同时,对提出的系统在AWGN信道和其他的多径信道下做了仿真,并与正交二进制键控线性调频超宽带系统做了比较。仿真结果显示所设计的系统通过引入脉冲位置调制和声表面波Rake接收机,在IEEE802.15.4a制定的室内外信道环境下,有着稳健的抗多径干扰和阴影衰落的能力,并且在非视距环境下性能要远优于正交二进制键控线性调频超宽带系统。
In view of the cross-correlation interference caused by the up-link and down-link LFM signals in practice, a linear FM spread-spectrum UWB wireless communication system based on pulse position modulation is designed. At the same time, the proposed system is simulated on AWGN channels and other multipath channels, and compared with orthogonal binary-modulated FM UWB systems. Simulation results show that the system designed by the introduction of pulse position modulation and surface acoustic wave Rake receiver, developed in IEEE802.15.4a indoor and outdoor channel environment, has robust anti-multipath interference and shadow fading ability, and in non-visual Performance far better than the environment than the orthogonal binary keyed FM FM UWB system.