A simple multiplexing scheme for MIMO systems using multiple spreading codes

Conference Record of the Thirty-Fourth Asilomar Conference on Signals, Systems and Computers (Cat. No.00CH37154) Pub Date : 2000-10-29 DOI:10.1109/ACSSC.2000.911056

S. Mudulodu, A. Paulraj

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引用次数: 16

Abstract

There has been a growing interest in the use of multiple transmit and receive antennas for wireless communications, due to the enormous increase in data rate that they promise over single antenna systems. Spatial multiplexing is a scheme that aims to achieve such high data rates by transmitting an independent substream of data from each transmit antenna. However when the receive spatial signatures are poor (i.e., when the channel is not favorable), one or more transmit antennas can not be used to transmit an independent stream. In fixed modulation systems this results in some loss in data rate. We consider such fixed modulation systems and propose a scheme that uses multiple spreading codes as in CDMA MIMO (multiple input multiple output) systems to smartly combine code multiplexing with spatial multiplexing in order to mitigate this loss in data rate. We also show that, in the presence of a low bandwidth feedback path, the proposed scheme, unlike the spatial-only multiplexing scheme, allows the transmitter to adapt the data, rate smoothly based on the receive spatial signatures.

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一个简单的多路复用方案，用于MIMO系统使用多个扩展码

在无线通信中使用多个发射和接收天线的兴趣越来越大，因为它们比单天线系统承诺的数据速率有了巨大的提高。空间复用是一种旨在通过从每个发射天线传输独立的数据子流来实现如此高的数据速率的方案。然而，当接收空间特征较差时(即当信道条件不佳时)，不能使用一个或多个发射天线来传输独立的流。在固定调制系统中，这会导致数据速率的一些损失。我们考虑了这种固定调制系统，并提出了一种方案，该方案使用CDMA MIMO(多输入多输出)系统中的多个扩展码，将码复用与空间复用巧妙地结合起来，以减轻数据速率的损失。我们还表明，在存在低带宽反馈路径的情况下，与仅空间复用方案不同，所提出的方案允许发射机根据接收的空间签名平滑地调整数据速率。

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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Conference Record of the Thirty-Fourth Asilomar Conference on Signals, Systems and Computers (Cat. No.00CH37154)

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