802.16e中测距码相关性研究及仿真

摘要

在802.16e系统中,测距是实现上行链路初始接入同步的重要过程.不同的用户选择不同的测距码,基站利用测距码的相关性来检测用户并估计信号时廷.对测距码的生成原理和相关性能进行了详细的分析,并利用Matlab进行了仿真.理论分析和计算机仿真结果表明:测距码自相关峰值明显高于互相关峰值,峰均比可达4倍以上.%Ranging is an important process for uplink initial access and synchronous in 802.16e system. Different users select different ranging codes, base station detects the ranging signals and estimate their signal delay by the correlation of the ranging codes. This paper carefully researched its generative principle and correlation property, and did simulation by MATLAB. The results show that the ranging code has higher auto-correlation peak than cross-correlation obviously, peak average ratio gets more than 4 times.