电讯技术2016，Vol.56Issue(12)：1327-1334,8.DOI:10.3969/j.issn.1001-893x.2016.12.005
采用截断循环前缀的OFDM系统码元盲同步
Blind Symbol Synchronization Using Truncated Cyclic Prefix in OFDM Systems
摘要
Abstract
In order to improve the anti-interference capability of orthogonal frequency-division multiplexing ( OFDM) systems in low signal-to-noise ratio( SNR) condition,a robust blind symbol synchronization al-gorithm is proposed. According to cyclic prefix( CP) and distance analysis,this algorithm realizes the blind estimation of timing offset in frequency-domain without the information of SNR. The basic idea is to ex-plore the comparability between cyclic prefix( CP) and corresponding tail of the symbol body and minimize the distance between symbols in frequency domain. The distance may also be measured in time domain to decrease the implement complexity greatly. In order to strip the multipath interference and improve per-formance as much as possible,a truncated CP is used,which is shortened by cutting the top. Simulation re-sults show that the minimum of this function necessarily points to the correct timing offset at 0 dB. The pro-posed algorithm is robust and outperforms previous CP-based algorithms, particularly when SNR is low. Hence,this algorithm may be more suited for low SNR applications,such as systems combining the direct sequence spread spectrum technology with OFDM.关键词
正交频分复用/码元盲同步/截断循环前缀/低信噪比Key words
orthogonal frequency-division multiplexing(OFDM)/blind symbol synchronization/truncated cyclic prefix/low SNR分类
信息技术与安全科学引用本文复制引用
张立民,马钰,张仲凯,刘思琦,王建雄,吴莉强..采用截断循环前缀的OFDM系统码元盲同步[J].电讯技术,2016,56(12):1327-1334,8.基金项目
国家自然科学基金重大研究计划项目(91538201) （91538201）
山东省“泰山学者”建设工程项目(ts201511020) （ts201511020）
