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Advances in Multiuser Detection by Michael L. Honig

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6

JOINT DETECTION FOR MULTI-ANTENNA CHANNELS

Antonia Tulino, Matthew R. McKay, Jeffrey G. Andrews,Iain B. Collings, and Robert W. Heath, Jr.

6.1 INTRODUCTION

Multiuser and multiantenna communication systems have many similarities. This is particularly true when the transmit antenna array sends multiple independent data streams that interfere in time and frequency, a paradigm that is commonly referred to as multiple-input multiple-output (MIMO) or more specifically, spatial multiplexing. In the case of spatial multiplexing, each data stream must be separated and decoded at the receiver, which creates a scenario that is formally nearly identical to the case of jointly decoding multiple interfering users. Indeed, many of the theoretical advances in multiantenna receivers have closely followed previous advances in multiuser detectors. At the present time, innovation in both realms is synergistic since advances in either the spatial or user domain can be used to spur progress in the other.

The goal of this chapter is to provide a contemporary overview of joint detection techniques in MIMO systems and to generate insights into parallels with multiuser systems. We begin by developing a general matrix channel model for MIMO systems, and note how this model is applicable to many multiuser scenarios, as well as highlighting the areas of departure for single user MIMO versus multiuser single antenna systems. We then review the key capacity results for multi-antenna systems under varying assumptions ...

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