基于自适应时变的OFDM无线信道机会估计机制

发布时间：2018-01-06 15:03

本文关键词：基于自适应时变的OFDM无线信道机会估计机制　出处：《计算机工程与设计》2017年03期 　论文类型：期刊论文

【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。
[Abstract]:Aiming at the problems of uplink and downlink signal conflict and low estimation accuracy in OFDM wireless channel estimation. A novel orthogonal frequency division multiplexing for orthogonal frequency division multiplexing (OFDM) is proposed. An adaptive time-varying opportunistic channel estimation mechanism for OFDM wireless channel is presented. The characteristics of OFDM symbol, discrete signal string parallel conversion, adaptive Fourier transform and its inverse transform are considered. In order to optimize the complexity of channel estimation, the OFDM wireless channel model is proposed, which is based on the selection strategy of relay node set and the channel estimation based on multi-hop wireless channel transmission. An adaptive time-varying OFDM channel opportunity estimation mechanism is proposed. The experimental results show that the proposed channel estimation algorithm is compared with the channel estimation mechanism based on decision feedback. The proposed estimation algorithm can better adapt to the dynamic changes of subcarrier size and user size and provide high accuracy and high throughput wireless channel estimation.
【作者单位】：南阳理工学院软件学院;黄河交通学院信息工程系;湖北大学计算机与信息工程学院;南阳理工学院计算机与信息工程学院;
【基金】：河南省科技攻关重点计划基金项目(122102210563;132102210215) 河南省高等学校重点科研项目计划基金项目(15B520008)
【分类号】：TN929.53
【正文快照】： 0引言在正交频分复用(orthogonal frequency division multi-plexing,OFDM)无线传输过程中,研究一种适用动态多变环境的无线信道估计机制,既保障信道估计高精度又不增加信道额外负载,从而为无线通信提供可靠保障成为无线通信[1]和信号处理[2]领域的热点问题。OFDM系统方面,文

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