Approaching the MIMO Capacity with a Low-Rate Feedback Channel in V-BLAST

This paper presents an extension of the vertical Bell Laboratories Layered Space-Time (V-BLAST) architecture in which the closed-loop multiple-input multiple-output (MIMO) capacity can be approached with conventional scalar coding, optimum successive decoding (OSD), and independent rate assignments...

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Bibliographic Details
Published inEURASIP journal on advances in signal processing Vol. 2004; no. 5; p. 816702
Main Authors Chung, Seong Taek, Lozano, Angel, Huang, Howard C, Sutivong, Arak, Cioffi, John M
Format Journal Article
LanguageEnglish
Published New York Springer Nature B.V 01.05.2004
Subjects
Algorithms
Antennas
Closed loops
Decoding
Feedback
MIMO communication
Power control
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Summary:This paper presents an extension of the vertical Bell Laboratories Layered Space-Time (V-BLAST) architecture in which the closed-loop multiple-input multiple-output (MIMO) capacity can be approached with conventional scalar coding, optimum successive decoding (OSD), and independent rate assignments for each transmit antenna. This theoretical framework is used as a basis for the proposed algorithms whereby rate and power information for each transmit antenna is acquired via a low-rate feedback channel. We propose the successive quantization with power control (SQPC) and successive rate and power quantization (SRPQ) algorithms. In SQPC, rate quantization is performed with continuous power control. This performs better than simply quantizing the rates without power control. A more practical implementation of SQPC is SRPQ, in which both rate and power levels are quantized. The performance loss due to power quantization is insignificant when 4–5 bits are used per antenna. Both SQPC and SRPQ show an average total rate close to the closed-loop MIMO capacity if a capacity-approaching scalar code is used per antenna.
ISSN:1687-6180
1687-6172
1687-6180
DOI:10.1155/S1110865704312035