MB-OFDM UWB系统频率同步设计  

Design of MB-OFDM UWB System Frequency Synchronization

作　　者：任世杰[1,2] 安建平[1] 卜祥元[1] 徐湛[3] 张霞[2] 

机构地区：[1]北京理工大学信息与电子学院,北京100081 [2]聊城大学山东省光通信科学与技术重点实验室,山东聊城252000 [3]北京信息科技大学信息与通信工程学院,北京100192

出　　处：《北京理工大学学报》2016年第12期1283-1288,共6页Transactions of Beijing Institute of Technology

基　　金：国家自然科学基金资助项目(61402044;61501214);国家"八六三"计划项目(2015AA01A706);北京市教委科研计划资助项目(KM201511232011);北京市科技新星计划资助项目(Z161100004916086)

摘　　要：研究多频带正交频分复用超宽带（MB-OFDM UWB）系统中载波频偏（CFO）和采样频偏（SFO）对系统性能的影响及频率同步设计;系统频率同步设计首先在时域利用前导估计CFO,并按频带加权平均以提高估计精度,然后在频域利用导频估计剩余CFO和SFO,最后在频域进行剩余相位跟踪.所设计的方法适用于超宽带各个带组（BG1-BG5）所有的跳频模式（TFC1-TFC10）.仿真结果表明,在15dB信噪比下,归一化CFO的均方误差达到10-16数量级,归一化SFO的均方误差达到10-10数量级,所设计方法具有较高的精度,适合于高速MB-OFDM UWB系统.The influence of carrier frequency offset （CFO） and sampling frequency offset （SFO） on the system performance in multi-band orthogonal frequency division multiplexing ultra wideband （MB-OFDM UWB） system and frequency synchronization was analyzed. First, preambles were used to estimate the CFO in time domain, the estimated value was averaged according to each frequency band＇s SNR in order to improve the estimate precision. Second, pilots were used to estimate the residual CFO and the SFO in frequency domain. In the end, the residual phase error was compensated in frequency domain. Analysis results show that, the methods are suitable for each band group （BG1 - BGS） and all frequency hopping patterns （TFCI-TFC10）. The simulation results show that, when SNR is 15 dB, the mean square error level of normalized CFO is 10^-16 , the mean square error level of normalized SFO is 10^-10. The design method is of high accuracy, and is suitable for high speed MB-OFDM UWB system.

关 键 词：MB-OFDM UWB ECMA-368 载波频偏 采样频偏 同步 

分 类 号：TN911.22[电子电信—通信与信息系统]