B3G系统RACH信道前导码的设计与检测算法  

Preamble Design for RACH and Research on Detection Algorithm in B3G Systems

作　　者：别志松[1] 张晓林[1] 张瀚峰[1] 吴伟陵[1] 

机构地区：[1]北京邮电大学信息工程学院,北京100876

出　　处：《北京邮电大学学报》2007年第4期19-22,共4页Journal of Beijing University of Posts and Telecommunications

基　　金：国家自然科学基金重大项目(90204001)

摘　　要：采用具有零相关区特性的generalized chirp-like(GCL)序列作为随机接入信道的前导码,并加上循环后缀以便有效利用GCL序列良好的周期相关特性,提高前导码的检测性能.提出了一种基于相关窗内峰均比检测的前导码检测算法.针对该算法设计了固定阈值,分析了虚警和漏检概率;讨论了该算法通过简单修正作为碰撞检测和信道估计方法的可行性.分析和仿真结果证明,这种前导码和相应的检测算法具有良好的性能.A kind of generalized chirp-like （GCL） sequences are adopted as the preambles of the random access channel（RACH）, meanwhile, a cyclic postfix is added. The structure can utilize the perfect periodic correlation properties of GCL sequences effectively to improve the detection performance. Furthermore, a kind of detection algorithm is proposed, that is based on the peak-average ratio detection within a window. A threshold is designed based on the proposed algorithm. Both false alarming probability and missing detection probability are analyzed. The possibility to adapt the proposed algorithm to be used as collision detection algorithm and channel estimation algorithm is also analyzed. Analysis and simulation results show that the proposed preamble structure and the corresponding detection algorithms have good performance.

关 键 词：随机接入信道 前导码 零相关区序列 虚警 漏检 

分 类 号：TN911.23[电子电信—通信与信息系统]