中文摘要：

针对OFDM无线信道估计中的上行链路与下行链路信号冲突和估计精度低等问题,提出一种适用于正交频分复用（orthogonal frequency division multiplexing,OFDM）无线信道的基于自适应时变的机会信道估计机制。考虑OFDM符号特征、离散信号串并转换特性和自适应傅里叶变换及其逆变换过程,为优化信道估计复杂度,提出OFDM无线信道模型。基于中继节点集合选取策略和基于多跳无线信道传输的信道估计,提出基于自适应时变的OFDM无线信道机会估计机制。对所提信道估计算法与基于判决反馈的信道估计机制进行实验对比,对比结果表明,所提估计算法可以更好地适应子载波规模和用户规模的动态变化,提供高精度和高吞吐率的无线信道估计。

英文摘要：

For the uplink and downlink signal conflict and the poor estimation precision in OFDM wireless channel estimation,an adaptive time-varying opportunity channel estimation method was presented for the OFDM（orthogonal frequency division multiplexing）wireless channel.The OFDM symbol features,discrete signal series and parallel conversion characteristics and adaptive Fourier transform and its inverse transform process were considered.To optimize the complexity of channel estimation,the OFDM wireless channel model was proposed.Based on the relay node set selection strategy and the channel estimation based on multi hop wireless channel transmission,OFDM wireless channel chance estimation mechanism was proposed.The channel estimation algorithm and decision feedback mechanism were compared through experiments based on the proposed channel estimation.The results show that the proposed estimation algorithm can better adapt to the dynamic changes of subcarrier scale and the users,with high accuracy and high throughput of wireless channel estimation.