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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Bibliographic Details
Published in:IET communications Vol. 7; no. 9; pp. 836 - 847
Main Authors: Zheng, Yahong Rosa, Wang, Mingxi, Zeng, Weiliang, Xiao, Chengshan
Format: Journal Article
Language:English
Published: Stevenage The Institution of Engineering and Technology 01.06.2013
John Wiley & Sons, Inc
Subjects:
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
Online Access:Get full text
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Summary: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.
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ISSN:1751-8628
1751-8636
DOI:10.1049/iet-com.2012.0731