MIMO Precoder Design With a Compensated QR-Decomposition Combination for CoMP Downlink Scenarios

This paper presents a multiple-input-multiple-output (MIMO) precoder with a compensated QR decomposition (CQRD) combination for coordinated multipoint (CoMP) downlink transmission. Unlike conventional QR decomposition (QRD) combination, CQRD combination adopts compensated channel matrix orderings. T...

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Vydáno v:IEEE transactions on vehicular technology Ročník 65; číslo 10; s. 7982 - 7992
Hlavní autoři: Chen, Chia-Wei, Tsao, Hen-Wai, Tsai, Pei-Yun
Médium: Journal Article
Jazyk:angličtina
Vydáno: New York IEEE 01.10.2016
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Témata:
Bit error rate
Coordinated multipoint (CoMP)
Decoding
Gain
Interference
MIMO
multiple-input–multiple-output (MIMO) precoding
QR decomposition (QRD)
Receivers
Sorting
vector precoding (VP)
ISSN:0018-9545, 1939-9359
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Shrnutí:This paper presents a multiple-input-multiple-output (MIMO) precoder with a compensated QR decomposition (CQRD) combination for coordinated multipoint (CoMP) downlink transmission. Unlike conventional QR decomposition (QRD) combination, CQRD combination adopts compensated channel matrix orderings. This paper first proposes CQRD combination for CoMP scenarios. The statistics for combined spatial subchannel gains with a CQRD combination of two coordinated base stations (BSs) are derived, and these statistics show that more balanced subchannel gains are generated with a CQRD combination than with a QRD combination. Furthermore, this paper proposes a generalized CQRD combination scheme with a joint sorting strategy that can be applied to scenarios with more than two coordinated BSs. Unlike the unsorted strategy, the joint sorting strategy determines an enhanced compensated combination to further increase spatial subchannel gains; therefore, the performance can be upgraded. Because conventional Tomlinson-Harashima precoding (THP) cannot be used in the CQRD combination, interference presubtraction and vector precoding (VP) is adopted. Theoretical analysis and simulation results are both provided to demonstrate the advantages of balanced spatial subchannel gains and enhanced bit-error-rate (BER) performance in the proposed CQRD-based schemes. Compared with existing QRD-based MIMO precoders in CoMP scenarios, the proposed CQRD-based schemes have substantial signal-to-noise ratio (SNR) improvements of 2-5 dB.
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ISSN:0018-9545
1939-9359
DOI:10.1109/TVT.2015.2510823