Channel estimation for OFDM systems with transmitter diversity for a quasi-static fading channel

IEEE Military Communications Conference, 2003. MILCOM 2003. Pub Date : 2003-10-13 DOI:10.1109/MILCOM.2003.1290120

Sugbong Kang, J. Lehnert

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引用次数: 4

Abstract

A simple channel estimation scheme for OFDM systems with transmitter diversity and a quasi-static fading channel is proposed. It is based on the assumption that the channel is highly correlated at nearby subcarriers. For channel estimation, the pilot sequence is given a different circular time shift at each transmitter antenna, which is equivalent to phase modulation in the frequency domain. Then, nearby subcarriers are used to provide an orthogonal subspace to separate channel frequency responses between transmitter antennas and the receiver antenna. The channel estimator is a simple linear filter whose weight vectors can be precalculated. Using this scheme, the system with transmitter diversity can be implemented with a minimal change in structure from the single antenna implementation. The transmitter diversity gain using the proposed channel estimation scheme is demonstrated in the typical WLAN (wireless LAN) environment. Significant improvement in error performance is achieved using a larger number of transmitter antennas when channel frequency coherence between nearby subcarriers is large.

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准静态衰落信道下具有发射机分集的OFDM系统信道估计

针对具有发射机分集和准静态衰落信道的OFDM系统，提出了一种简单的信道估计方案。它是基于信道在附近的子载波高度相关的假设。对于信道估计，导频序列在每个发射天线处被赋予不同的圆时移，这相当于频域的相位调制。然后，使用附近的子载波提供正交子空间来分离发射天线和接收天线之间的信道频率响应。信道估计器是一个简单的线性滤波器，其权向量可以预先计算。使用该方案，可以实现具有发射机分集的系统，与单天线实现相比，结构变化最小。在典型的无线局域网(WLAN)环境中演示了使用所提出的信道估计方案的发射机分集增益。当附近子载波之间的信道频率相干性较大时，使用更多的发射天线可以显著改善误差性能。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

IEEE Military Communications Conference, 2003. MILCOM 2003.

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