Low Complexity Optimal Soft-Input Soft-Output Demodulation of MSK Based on Factor Graph

The soft-input-soft-output (SISO) MSK demodulator is a key component in the iterative receiver for coded MSK systems. To reduce the complexity of the optimal SISO MSK demodulator using the BCJR algorithm, a low complexity suboptimal MSK demodulator was developed by K. R. Narayanan et al. However, ou...

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Bibliographic Details
Published in:IEEE communications letters Vol. 18; no. 7; pp. 1139 - 1142
Main Authors: Tong, Sheng, Huang, Defeng, Guo, Qinghua, Xi, Jiangtao, Yu, Yanguang
Format: Journal Article
Language:English
Published: New York, NY IEEE 01.07.2014
Institute of Electrical and Electronics Engineers
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects:
Algorithms
Applied sciences
Coding, codes
Complexity theory
Decoding
Demodulation
Exact sciences and technology
Information rates
Information, signal and communications theory
Iterative decoding
Modulation, demodulation
Signal and communications theory
Systems, networks and services of telecommunications
Telecommunications
Telecommunications and information theory
Transmission and modulation (techniques and equipments)
factor graph
demodulation
extrinsic information transfer (EXIT) chart
Minimum shift keying (MSK)
Performance evaluation
Information rate
Iterative method
Algorithm
Information transmission
Information loss
Simulation
Minimum shift keying
Algorithm complexity
Error correcting code
Parity check codes
Demodulator
Demodulation
ISSN:1089-7798, 1558-2558
Online Access:Get full text
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Description
Summary:The soft-input-soft-output (SISO) MSK demodulator is a key component in the iterative receiver for coded MSK systems. To reduce the complexity of the optimal SISO MSK demodulator using the BCJR algorithm, a low complexity suboptimal MSK demodulator was developed by K. R. Narayanan et al. However, our investigation on the symmetric information rate of MSK with the suboptimal demodulator shows that it incurs a significant information rate loss compared with the BCJR demodulator. To avoid the rate loss, a low complexity SISO MSK demodulator is derived based on a new factor graph for MSK, which is found to have comparable complexity to the suboptimal demodulator. Moreover, the proposed algorithm is equivalent to the BCJR algorithm and thus achieves optimal performance. Simulation results for LDPC coded MSK systems are provided to demonstrate the effectiveness of the proposed algorithm.
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ISSN:1089-7798
1558-2558
DOI:10.1109/LCOMM.2014.2325818