一种基于PN序列的OFDMA上行链路参数估计和信号检测方法

该文研究了OFDMA上行链路的频偏信道参数估计和信号检测问题,设计了一种OFDMA上行链路发射信号帧结构,信号帧的帧头由PN序列构成;提出了基于PN序列的频偏信道参数估计算法;并根据频偏信道参数采用时域最小均方误差检测算法进行信号检测.仿真表明:该文提出的频偏信道估计算法充分利用PN序列的相关特性,具有良好的抗噪特性、衰落信道适应性和高的估计精度;而时域最小均方误差信号检测算法也具有较好的误比特率性能.

Approach to Parameters Estimation and Signal Detection for OFDMA Uplink Based on PN Sequence

This paper addresses the problem of parameters estimation and signal detection for OFDMA Uplink. Firstly, a transmit signal frame structure for OFDMA uplink is designed, the preamble of frame structure consists of PN sequence. Secondly, the carrier frequency offset and channel estimation algorithm based on PN sequence are proposed, also a time minimum-mean-squre-error signal detection algorithm is proposed for OFDMA uplink. Simulation results demonstrate the carrier frequency offset and channel estimation algorithm can get more accurate parameters estimation because of correlation of PN sequence, meanwhile it is immune to the noise and adapts to the fading channel, the time minimum-mean-squre-error signal detection algorithm can provide better bit error rate performance.