Introducing space sampling for OFDM systems with multipath diversity

Proceedings of the 3rd IEEE International Symposium on Signal Processing and Information Technology (IEEE Cat. No.03EX795) Pub Date : 2003-12-14 DOI:10.1109/ISSPIT.2003.1341149

G V Rangaraj, D. Jalihal, K. Giridhar

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引用次数: 3

Abstract

Multiple receive antennas are known to provide receiver diversity but typically require considerable separation between them. We introduce the concept of space sampling at the receiver where antennas are placed relatively close to each other. Since the antennas are close, the samples are highly spatially correlated and does not help in performance improvement in a typical wireless system with flat fading. However, this concept is very useful particularly in an OFDM system with frequency selective fading which has an inherent multipath diversity. Under these circumstances, the required space diversity for performance improvement is obtained by the transformation of multipath diversity to useful space diversity in frequency domain inherently by an OFDM system (G. V. Rangaraj et al., June 2003). The minimum separation required between the antennas under such circumstances is derived analytically and we have show that even with a separation of only 0.44/spl lambda/, the required spatial correlation in the frequency domain becomes sufficiently low.

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介绍了多径分集OFDM系统的空间采样

已知多个接收天线可以提供接收器分集，但通常要求它们之间有相当大的距离。我们在接收端引入空间采样的概念，其中天线彼此放置相对较近。由于天线很近，因此采样具有高度的空间相关性，在典型的平坦衰落无线系统中无助于性能改进。然而，这个概念是非常有用的，特别是在频率选择性衰落的OFDM系统，它具有固有的多径分集。在这种情况下，OFDM系统通过将多径分集转换为频域固有的有用空间分集来获得性能提升所需的空间分集(G. V. Rangaraj et al.， June 2003)。在这种情况下，天线之间所需的最小距离是解析导出的，我们已经表明，即使只有0.44/spl λ /的距离，所需的空间相关性在频域变得足够低。

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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Proceedings of the 3rd IEEE International Symposium on Signal Processing and Information Technology (IEEE Cat. No.03EX795)

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