一种基于OFDM的无线传感器网络PAPR减小方法  

A Method of Reducing the PAPR of Wireless Sensor Networks Based on OFDM

作　　者：孔德彭[1] 周国华[1] 何婷 方栋良[1] 徐云[1] 

机构地区：[1]浙江工业大学技术与教育发展研究中心,杭州310023 [2]杭州南江物联网科技有限公司,杭州310031

出　　处：《传感技术学报》2014年第4期551-556,共6页Chinese Journal of Sensors and Actuators

基　　金：国家科技支撑子项目(2012BAI34B03);国家社科基金重大项目(12&ZD229);教育部人文社科规划项目(13YAZH043)

摘　　要：无线传感器网络(WSNs)集数据采集、处理和通信于一体,在进行大流量媒体信息采集和传输时,采用超宽带技术(UWB)能有效降低WSNs系统功耗并可以方便与其他系统兼容,并较好适应不同的环境;但是超宽带信号使用OFDM调制技术完成信号传输时,会带给系统较高的峰均功率比。提出一种反转双曲正切脉冲成型技术,通过数据与成型矩阵求积,实现子载波符号间的相关性,进而减小系统峰均功率比。文中给出了采用多载波实施设计的方案并进行验证,通过互补积分函数(CCDF)和误码率(BER)指标的对比发现,该方案能得出降低4 dB的效果,证明该方法切实可行。These features can be completed of data collection, processing and communication in wireless sensor networks（ WSNs ） , the ultra-wideband technology （ UWB ） used in WSNs can effectively reduce system power consumption and be easily compatible with other systems and better adapt to different environments than before scheme,during the large flow of media information collection and transmission. Using ultra-wideband technology to complete signal transmission by the method of OFDM modulation,there will exist a very high peak to average power ratio（ PAPR） to the system. This paper presents an inverted hyperbolic tangent pulse shaping technology, which through data and forming matrix product to realize the correlation between subcarrier symbols,in order to reducing the system peak to average power ratio. This paper provides the design of a multi-carrier solutions implemented and validated by comparing the Complementary Cumulative Distribution Function（ CCDF） and symbol error ratio（ BER） index found that the scheme can reach the result of reduce 4 dB,it proves that the method is feasible.

关 键 词：无线传感器网络 正交频分复用 超宽带技术 峰均功率比 多载波系统 

分 类 号：TN929.53[电子电信—通信与信息系统]