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Low complexity optimal soft-input soft-output demodulation of MSK based on factor graph

Journal Article


Abstract


  • 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.

Publication Date


  • 2014

Citation


  • S. Tong, D. Huang, Q. Guo, J. Xi & Y. Yu, "Low complexity optimal soft-input soft-output demodulation of MSK based on factor graph," IEEE Communications Letters, vol. 18, (7) pp. 1139-1142, 2014.

Scopus Eid


  • 2-s2.0-84904312254

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/2806

Number Of Pages


  • 3

Start Page


  • 1139

End Page


  • 1142

Volume


  • 18

Issue


  • 7

Place Of Publication


  • United States

Abstract


  • 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.

Publication Date


  • 2014

Citation


  • S. Tong, D. Huang, Q. Guo, J. Xi & Y. Yu, "Low complexity optimal soft-input soft-output demodulation of MSK based on factor graph," IEEE Communications Letters, vol. 18, (7) pp. 1139-1142, 2014.

Scopus Eid


  • 2-s2.0-84904312254

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/2806

Number Of Pages


  • 3

Start Page


  • 1139

End Page


  • 1142

Volume


  • 18

Issue


  • 7

Place Of Publication


  • United States