Practical linear precoder design for finite alphabet multiple-input multiple-output orthogonal frequency division multiplexing with experiment validation

A low complexity precoding method is proposed for practical multiple-input multiple-output (MIMO) orthogonal frequency-division multiplexing (OFDM) systems. Based on the two-step optimal precoder design algorithm that maximises the lower bound of the mutual information with finite-alphabet inputs, t...

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Vydáno v:	IET communications Ročník 7; číslo 9; s. 836 - 847
Hlavní autoři:	Zheng, Yahong Rosa, Wang, Mingxi, Zeng, Weiliang, Xiao, Chengshan
Médium:	Journal Article
Jazyk:	angličtina
Vydáno:	Stevenage The Institution of Engineering and Technology 01.06.2013 John Wiley & Sons, Inc
Témata:	8PSK Algorithms bit error rate channel coding channel diagonalisation methods Channels codecs Complexity computational complexity data processing Design engineering experiment validation extended channel matrices finite alphabet multiple‐input multiple‐output orthogonal finite‐alphabet inputs fixed‐platform nonline‐of‐sight channels frequency division multiplexing indoor experiments indoor radio iterative methods linear codes linear precoder design low complexity precoding method Mathematical analysis maximum diversity MIMO communication MIMO OFDM systems MIMO size MIMO‐OFDM system multiplexing OFDM modulation optimisation Optimization Orthogonal Frequency Division Multiplexing phase shift keying precoder matrix precoding precoding matrices precoding method QPSK quadrature phase shift keying radio transceivers SNR region transceiver test bed transceivers two‐step algorithm two‐step optimal precoder design algorithm Vectors (mathematics) water‐filling methods iterative methods experiment validation linear codes channel coding SNR region two-step optimal precoder design algorithm water-filling methods linear precoder design precoding quadrature phase shift keying MIMO OFDM systems QPSK optimisation phase shift keying transceivers two-step algorithm OFDM modulation indoor radio MIMO communication MIMO-OFDM system precoder matrix low complexity precoding method radio transceivers codecs maximum diversity data processing fixed-platform nonline-of-sight channels precoding method 8PSK transceiver test bed bit error rate MIMO size finite-alphabet inputs finite alphabet multiple-input multiple-output orthogonal indoor experiments precoding matrices multiplexing extended channel matrices frequency division multiplexing computational complexity channel diagonalisation methods
ISSN:	1751-8628, 1751-8636
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Popis
Shrnutí:	A low complexity precoding method is proposed for practical multiple-input multiple-output (MIMO) orthogonal frequency-division multiplexing (OFDM) systems. Based on the two-step optimal precoder design algorithm that maximises the lower bound of the mutual information with finite-alphabet inputs, the proposed method simplifies the precoder design by fixing the right singular vectors of the precoder matrix, eliminating the iterative optimisation between the two steps, and discretising the search space of the power allocation vector. For a 4 × 4 channel, the computational complexity of the proposed precoder design is reduced to 3 and 6% of that required by the original two-step algorithm with quadrature phase shift keying (QPSK) and 8 phase-shift keying (8PSK), respectively. The proposed method achieves nearly the same mutual information as the two-step iterative algorithm for a large range of signal-to-noise ratio (SNR) region, especially for large MIMO size and/or high constellation systems. The proposed precoding design method is applied to a 2 × 2 MIMO-OFDM system with 2048 subcarriers by designing 1024 precoders for extended channel matrices of size 4 × 4. A transceiver test bed implements these precoding matrices in comparison with other existing precoding schemes. Indoor experiments are conducted for fixed-platform non-line-of-sight channels, and the data processing results show that the proposed precoding method achieves the lowest bit error rate compared with maximum diversity, classic water-filling and channel diagonalisation methods.
Bibliografie:	SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 14 ObjectType-Article-2 content type line 23
ISSN:	1751-8628 1751-8636
DOI:	10.1049/iet-com.2012.0731