IEEE802.16e系统上行链路初始测距算法研究  

Study on the Initial Ranging Algorithm in Uplink IEEE 802.16e System

作　　者：王薇[1,2] 杨维[1,2] 韩东升[1] 

机构地区：[1]北京交通大学轨道交通控制与安全国家重点实验室,北京100044 [2]东南大学移动通信国家重点实验室,南京210096

出　　处：《电子与信息学报》2010年第4期805-810,共6页Journal of Electronics & Information Technology

基　　金：国家自然科学基金(60572036;50534060);国家863计划项目(2007AA01Z259);国家科技重大专项(2009ZX03003-005);东南大学移动通信国家重点实验室开放基金(W200816)资助课题

摘　　要：该文提出了一种适用于IEEE802.16e的OFDMA系统上行链路的初始测距频域改进算法。频域算法利用测距信号具有连续相位的特点,在频域将接收信号与备选码字共轭相关,按照接入用户信号的强弱依次检测出不同用户发送的码字和定时偏差,从而完成初始测距过程。改进频域算法在频域检测方法的基础上结合了串行干扰抵消的思想,提高了多用户同时接入系统时的正确检测概率,降低了虚警概率。通过仿真比较了改进算法和时域、频域算法的性能。结果表明,所提出的算法在计算复杂度和性能上兼有一定的优势。A novel improved initial ranging algorithm in frequency domain is proposed for the uplink OFDMA system based on IEEE 802.16e. The initial ranging progress in frequency domain is completed by correlating the receiving signal with ranging codes in the frequency domain and detecting the used ranging code and timing offset of different users according to the power of ranging signal. Combined with serial interference cancellation,the proposed algorithm increases the correct detection probability of the system and decreases the false alarm rate when multi-users are accessing to the system simultaneously. The performance of the proposed algorithm and algorithms both in time and frequency domain is compared by simulation. The simulation results show that the proposed algorithm outperforms the original time and frequency domain algorithms both in performance and calculation complexity.

关 键 词：正交频分复用多址接入 初始测距 串行干扰抵消 

分 类 号：TN929.5[电子电信—通信与信息系统]