Synchronization techniques and guard-band-configuration scheme for single-antenna vector-OFDM systems
Synchronization techniques and guard-band-configuration scheme for single-antenna vector-OFDM systems
复制标题
DOI：
10.1109/twc.2005.853910
复制
发表时间：
2005-09
影响因子：
10.4
通讯作者：
Hong Zhang;Xiang-Gen Xia;Leonard J. Cimini;Pak Chung Ching
中科院分区：
文献类型：
--
作者：
Hong Zhang;Xiang-Gen Xia;Leonard J. Cimini;Pak Chung Ching
矢量正交频分复用(Ofdm)是单天线系统中的一种推广。它将一个符号间干扰(ISI)信道转换为多个“无符号间干扰”的矢量信道，同时在单抽头均衡中使用信道矩阵而不是信道系数。在多径衰落信道中，它受益于信号空间分集。本文讨论了矢量OFDM的保护带配置、定时估计、载波同步和采样频率同步等实际问题。给出了矢量OFDM的一种等价结构，揭示了矢量OFDM与传统OFDM之间的关系，从而可以修改传统OFDM的保护带配置以及载波和采样频率同步的解决方案，使之适合于矢量-OFDM框架。分析还表明，在性能相当的情况下，传统OFDM框架中用于定时估计和载波频率同步的预快速傅立叶变换(FFT)算法可以直接扩展到矢量OFDM。未编码系统的仿真结果表明了所提出的同步技术的有效性。
Vector orthogonal frequency division multiplexing (OFDM) was proposed for single-antenna systems as a generalization of OFDM. It converts an intersymbol interference (ISI) channel into multiple "ISI-free" vector channels while involving channel matrices instead of channel coefficients in one-tap equalization. Over multipath fading channels, it benefits from signal-space diversity. This paper addresses practical issues such as guard-band configuration, timing estimation, and carrier- and sampling-frequency synchronization for vector OFDM. An equivalent structure derived for vector OFDM manifests the relation between vector OFDM and conventional OFDM so that the solutions to guard-band configuration as well as carrier- and sampling-frequency synchronization for conventional OFDM can be modified to fit into the vector-OFDM framework. It is also shown by analysis that the pre-fast Fourier transform (FFT) algorithms for timing estimation and carrier-frequency synchronization in the conventional OFDM framework can be extended straightforwardly to vector OFDM with comparable performance. Simulation results of uncoded systems are given to show the effectiveness of the proposed synchronization techniques.