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Linear minimum-distance precoding for MIMO systems using quadrature amplitude modulation | IEEE Conference Publication | IEEE Xplore

Linear minimum-distance precoding for MIMO systems using quadrature amplitude modulation


Abstract:

The criterion of maximizing the minimum Euclidean distance under the transmit power constraint is investigated in this paper for multiple-input multiple-output (MIMO) spa...Show More

Abstract:

The criterion of maximizing the minimum Euclidean distance under the transmit power constraint is investigated in this paper for multiple-input multiple-output (MIMO) spatial multiplexing systems. With a real-valued constraint on the precoding matrix, a new low-complexity construction algorithm is proposed for arbitrary number of data streams and rectangular quadrature amplitude modulation (QAM) input. Feasible precoding matrices are constructed with distinctive ranks dropping from full rank to rank one, where the full-rank precoder is generated through an iteration mechanism, and the rank-one precoder is obtained by a parameterized matrix associated with the particular modulation level of QAM constellation. In addition, the other rank-deficient precoders are formally constructed by a combination of two sub-precoders from lower dimensional space. The achievable minimum distance is also presented in closedform expression for the proposed precoder, and simulation results validate the efficiency of the proposed precoder as compared with the traditional cross-form precoder.
Date of Conference: 24-26 October 2013
Date Added to IEEE Xplore: 02 December 2013
Electronic ISBN:978-1-4799-0308-5
Conference Location: Hangzhou, China

I. Introduction

Multiple-input multiple-output (MIMO) wireless systems [1] have been extensively investigated due to the potential for high-speed transmission in many different communication scenarios, such as unicast with single user and broadcast with multiple users. When the perfect channel knowledge is available at the transmit side, various precoding schemes can be employed to improve spectral efficiency as well as link reliability for the MIMO system. It's rational that for MIMO Gaussian channels with finite alphabet input, the bit-error-rate (BER) performance is essentially dominated by the minimum Euclidean distance between points in the received signal space. In this regard, a linear precoder, associated with the maximum likelihood (ML) receiver, is considered in this paper under the criterion of maximizing the minimum Euclidean distance with average transmit power constraint, which is referred to as minimum-distance precoder hereinafter.

References

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