Approach to Parameters Estimation and Signal Detection for OFDMA Uplink Based on PN Sequence
一种基于PN序列的OFDMA上行链路参数估计和信号检测方法

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.