基于ZigBee的无线低压电力数据集抄系统终端设计

摘要

This paper reports a study on the direct sequence spreading spectrum (DSSS) processing and Offset Quadrature Phase Shirt Keying(OQPSK) modulation wireless transceiver specified by ZigBee standard.The study focuses on the performance withstanding noise in Additive White Gaussian Noise (AWGN) and Rayleigh flat-fading channels.A Matlab-based simulator is developed for DSSS transceiver,and the correlation between the length of spectrum spreading chip and the performance of communication system withstanding noise is researched.The results indicate that 32 yards long spread spectrum communication system bit error rate can be reduced to 1/23 compared with 16 yards long spread spectrum communication system when signal-to-noise ratio is 6dB.In other words,the performance withstanding noise could be enhanced using long spectrum spreading chip.%研究了符合ZigBee规定的直接序列扩频(DSSS)和偏移正交相移键控(OQPSK)调制的无线低压电力数据集抄系统收发机,重点分析了ZigBee收发机在加性高斯白噪声(AWGN)信道和瑞利信道中的抗噪性能表现.利用Matlab编程工具对直接序列扩频通信收发机系统进行仿真,研究了扩频码片长度与通信系统抗噪性能的关系.仿真结果表明,信噪比为6dB时,32位码长扩频通信系统误码率可以降低到16位码长扩频通信系统的1/23,即使用长扩频码片可以提高无线低压集抄系统的抗噪性能.