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joint decoding and estimation of S patio-Temporally Correlated Binary Sources

IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY 2018年第7期67卷 6690-6694页

作者： Izbar, Mohd Azri Mohd Aljohani, Abdullah Jeza Ng, Soon Xin Hanzo, Lajos Univ Teknol Malaysia Razak Sch Engn & Adv Technol Wireless Commun Ctr Kuala Lumpur 54100 Malaysia Univ Teknol Malaysia Razak Sch Engn & Adv Technol U BAN Grp Kuala Lumpur 54100 Malaysia Umm Alqura Univ Mecca Saudi Arabia Univ Southampton Sch Elect & Comp Sci Southampton SO17 1BJ Hants England

In the context of distributed joint source-channel coding, we conceive a joint decoding and estimation scheme for binary Markov sources exhibiting spatio-temporal correlation. The proposed scheme is designed based on the serial concatenation of a trellis coded modulation (TCM) scheme and a unity-rate code. The symbol-based maximum a posteriori algorithm employed for TCM. decoding is modified in order to exploit the source correlation. The estimation of both the spatial and temporal correlation parameters is performed jointly with the iterative decoding, hence allowing the estimated parameters to he updated after each iteration. Our simulation results reveal that when both the spatial and temporal correlation parameters are unknown, the proposed joint decoding and estimation scheme approaches the performance to the ideal system relying on perfectly known correlation parameters, therefore, demonstrating the superiority of the proposed scheme.

关键词： joint source-channel coding distributed source coding joint decoding and estimation

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Incremental frequency, amplitude and phase tracker (IFAPT) for coherent demodulation over fast flat fading channels

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IEEE COMMUNICATIONS LETTERS 1999年第11期3卷 314-316页

作者： Bar-David, I Elia, A Technion Israel Inst Technol Dept Elect Engn IL-32000 Haifa Israel

The Incremental Frequency Amplitude and Phase Tracker (IFAPT) is a recursive algorithm that estimates the parameters of piecewise-linear approximation to assumed continuous narrow-band signals. The parameters are amplitude, phase, and their respective slopes. The simple, recursive nature of IFAPT enables its direct interaction with recursive algorithms, such as the Viterbi and the BCJR in the APP SISO module, used for iteratively decoding concatenated codes. An augmented APP (A(2)P(2))-module, containing IFAPT and BCJR algorithms, is here applied to iterative decoding serial concatenated convolutional codes under Rayleigh fading conditions with diversity reception. The bit-error rate under Rayleigh fading with dual diversity reception at E-hT/N-o - 6 dB and f(d)T(s) = 10(-2) is 10(-4), where E-bT is the total mean energy per bit in both diversity branches, f(d) is the Doppler frequency, and T-s the symbol time.

关键词： channel parameter tracking iterative decoding joint decoding and estimation turbo codes

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Augmented APP (A²P²) module for a posteriori probability calculation and channel parameter tracking

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IEEE COMMUNICATIONS LETTERS 1999年第1期3卷 18-20页

作者： Bar-David, I Elia, A Technion Israel Inst Technol Dept Elect Engn IL-32000 Haifa Israel

The augmented a posteriori probability (APP) module, denoted A(2)P(2), comprises two mutually supporting algorithms: 1) a soft-input soft-output (SISO) APP module, adjusted to output edge metric information and 2) a recursive estimator for the channel parameters that benefits from this information at each step of the recursion, The thus-estimated parameters appropriately transform, in turn, the channel output signals that feed the SISO module. When applied to decoding a parallel concatenated convolutional code (PCCC) transmitted by binary phase-shift keying through a channel with frequency offset (0.08/T-s Hz) and phase jitter (0.23-rad rms), concentrated at 0.01/T-s Hz, (T-s-symbol duration), the degradation compared to fully coherent reception is a small fraction of 1 dB, without use of preamble.

关键词： channel parameter tracking iterative decoding joint decoding and estimation turbo codes

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