Fast Two-Stage Max-Log MAP Detection Schemes for the Soft-Input Soft-Output Detection of Coded Generalized Spatial Modulation Signals

We study soft-input soft-output (SISO) maximum logarithmic maximum a posteriori (max-log-MAP) detection of coded generalized spatial modulation (GenSM) signals for the iterative detection and decoding receiver. Due to the property of GenSM, extrinsic bit log-likelihood ratio associated with each bit...

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Bibliographic Details
Published in:IEEE transactions on wireless communications Vol. 23; no. 7; pp. 7745 - 7758
Main Authors: Liu, Tsung-Hsien, Chen, Zhen-Chang
Format: Journal Article
Language:English
Published: New York IEEE 01.07.2024
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects:
Computation
Detectors
Generalized spatial modulation
Indexes
Likelihood ratio
maximum a posteriori probability
Maximum likelihood decoding
MIMO communication
Modulation
single tree search
soft-input soft-output detection
Sorting algorithms
sphere decoding algorithm
Symbols
Transmitting antennas
ISSN:1536-1276, 1558-2248
Online Access:Get full text
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Summary:We study soft-input soft-output (SISO) maximum logarithmic maximum a posteriori (max-log-MAP) detection of coded generalized spatial modulation (GenSM) signals for the iterative detection and decoding receiver. Due to the property of GenSM, extrinsic bit log-likelihood ratio associated with each bit of the transmit antenna combination index and transmit symbol vector needs to be computed. By extending our sorting assisted successive sphere decoding algorithm (SA-SSDA) for the hard-output detection of GenSM signals, we study two-stage detection schemes here to conduct multiple single tree search sphere decoding algorithms (STS-SDAs) for the second stage computation, where the order of the multiple STS-SDAs is determined in the first stage computation. Unlike previous two-stage detectors, our emphasis is on studying the ordering metrics for determining the order of STS-SDAs and is on giving suggestions about the scenarios to use adequate ordering metrics for the purpose of complexity reduction. Accordingly, incorporating the tricks used by the SA-SSDA and STS-SDA, we arrive at a fast SA-SSTS-SDA for exactly max-log-MAP detection of GenSM signals. Our proposed detector is feasible for hardware implementation and may motivate future research on the SISO detection of coded GenSM signals.
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ISSN:1536-1276
1558-2248
DOI:10.1109/TWC.2023.3344174