摘要
鉴于Chirp信号的良好自相关性和匹配滤波后尖锐的时域特性,将Chirp扩频技术用于超宽带的通信,设计了基于正交二进制键控法的Chirp-UWB系统,并在AWGN信道下比较了Chirp-UWB与TH-PPM-UWB系统的可靠性。重点通过IEEE 802.15.4a推荐的信道模型讨论了2种室外传播的典型信道,并使用Chirp-UWB信号通过信道,对系统链路性能进行了仿真。仿真结果表明,在各种不同的传输情况下,Chirp-UWB信号的最大传输距离不同。在一定的情况下,随着数据速率的减少,传输的距离不断地增大;随着误符号率的减小,传输的距离也越来越近。同时,在系统中加入Rake接收机后,能起到很好的能量收集的作用。
In view of excellent autocorrelation and the knife - edged time domain property after the matched filter, Chirp spread spectrum technology has been applied to range communication of UWB. A Chirp - UWB system has been designed with binary orthogonal keying modulationm, further more, the BER performance is analyzed in AWGN channel while using Chirp- UWB and TH - PP - UWB systems. Considering the channel model recommended by IEEE802.15.4a,two typical channel are discussed,then using Chirp- UWB signal through the channel, simulating the link budget of system. Simulation results show that The difference of transmission,the maximum distance is different. The same transmission, the data is decreased, the distance is extended. The bit error is decreased,and the distance is decreased. Rake receiver plays an efficient role in energy receiving after adding in the system.
出处
《现代电子技术》
2009年第7期15-17,21,共4页
Modern Electronics Technique
