雷富军毕业论文.docx

毕业论文无线传感器网络信息传输技术研究学生姓名：雷福军 学号：1205064255学 院：信息与通信工程学院 _专 业：电子信息工程 _指导教师：王伟 _2016年6月无线传感器网络信息传输技术研究摘要无线传感器网络集信息获取、处理和传输为一体，在工业、农业、军事、环境监控、生物医疗、城市管理和抢险救灾等领域有着非常广泛的应用前景。传感器网络中信息传输是用户分发控制信息和获取感知数据的根本途径，而高效的信息传输技术则是一种提高网络能源使用效率的重要手段。偏移正交相移键控(OQPSK：Offset Quadrature Phase Shift Keying)调制技术是一种恒包络调制技术，其频谱特性好，且具有非常高的频谱利用率。适合实际应用环境下的数据传输系统，在卫星通信和移动通信领域有着广泛的应用。论文首先介绍了QPSK调制与解调技术的应用背景与现状，在深入研究QPSK调制解调技术原理的基础上引出了OQPSK。OQPSK是QPSK的改进，把同相和正交两支路的码流在时间上错开半个码元周期，因而不会出现两支路码元极性同时翻转的情况。然后分析了OQPSK的调制解调原理，在MATLAB中搭建了OQPSK调制解调系统的仿真平台，验证了算法的有效性。仿真结果表明，所设计的OQPSK调制解调系统实现了收发端的正确调制解调。对实际应用有一定的指导意义和研究价值。 关键词：无线传感器网络，QPSK，OQPSK，误比特率Research on Data Delivery Technolpogy in Wireless Sensor NetworksAbstractWireless sensor networks(WSNs)are integrated networks which can perform information gathering，processing and delivering．There are wide applications for WSNs in industry，agriculture，military affairs，environment monitoring，biomedicine，city managing and disaster succoring．As a basic issue in WSNs，data delivery determines how control packets are disseminated to sources and how data packets are gathered to sink through multi—hop routing．Moreover，high efficient data delivery determines the performance and energy efficiency in WSNs.Offset Quadraphase Phase Shift Keying (OQPSK: Offset Quadraphase Phase Shift Keying) modulation technique is a permanent envelope modulation technique with high spectral efficiency and power efficiency, and good spectral properties.It is widely used in real application environment request data transfer systems, satellite communication and mobile communication. First of all, the QPSK modulation and demodulation technology development as well as the background and study of current conditions is introduced and followed by a simple expound of OQPSK modulation and demodulation principle.OQPSK is an improved version of QPSK,OQPSK put the in-phase and quadrature two tributaries of the Bitstream in time staggered half the code element cycle,there will