ZigBee网络的物理层性能研究-检测技术与自动化装置专业论文.docx

山东轻工业学院硕士学位论文 山东轻工业学院硕士学位论文 I I ABSTRACT ZigBee network technology developed in recent years. It has been widely used in smart homes, industrial control, intelligent transportation, intelligent buildings and home care and other areas,because of low cost, low-speed, low-power consumption and high reliability. In order to ensure ZigBee network reliable and efficient communication, this paper studied the physical layer of ZigBee networks. In this paper, ZigBee network communication system model is the main line and analysis and simulation the various modules of the ZigBee communication process. In order to improve the reliability of ZigBee network and reduce the system bit error rate, this paper uses direct sequence spread spectrum (DSSS) communication technology.Compared with the normal communication systems Direct sequence spread spectrum communication system have a stronger anti-fading multipath interference and have the information hiding, multi-site security and communications features. In order to improve the reliability of ZigBee network and reduce the system bit error rate. This paper also encodes the binary sequence of programs in the sending side.Through the analysis and comparison of a linear code and convolutional code characteristics, this paper uses convolutional codes to encode the signal.The thsis focuses on the theoretical basis and the realization of a specific process of the encoding and decoding convolutional codes of error control code. The thsis analyzed Viterbi and Sequential decode two kinds of programs according the length of the sequence. Experimental simulation of the convolutional code has a better anti-Interference performance. Selecting the spread spectrum communication programs and coding schemes and transmising signal in the Gaussian white noise channel,we use binary phase shift keying (BPSK) and offset quadrature phase shift keying (O-QPSK) modulation and demodulation the signal respectively.Established a ZigBee network communication sy