Iterative decoding of serially concatenated convolutional codes and MSK

Abstract: Inthis paper, two hybrid concatenated super-orthogonal space-time trellis codes(SOSTTC) applying iterative decoding are proposed for flat fading channels. Theencoding operation is based on the concatenation of convolutional codes,interleaving and super-orthogonal space-time trellis codes. The firstconcatenated scheme consists of a serial concatenation of a parallelconcatenated convolutional code with a SOSTTC while the second consists ofparallel concatenation of two serially concatenated convolutional and SOSTTCcodes. The decoding of these two schemes is described, their pairwise errorprobabilities are derived and the frame error rate (FER) performances areevaluated by computer simulation in Rayleigh fading channels. The proposedtopologies are shown to perform better than existing concatenated schemes with aconstituent code of convolutional andspace-time codes in literature.

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Serially Concatenated Polar Coded CPM System with Iterative Decoding

10.1109/wcsp52459.2021.9613535 ◽

2021 ◽

Author(s):

Weilong Dou ◽

Ming-Min Zhao ◽

Ming Lei ◽

Min-Jian Zhao

Keyword(s):

Iterative Decoding ◽

Serially Concatenated

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Serially concatenated OSMLD codes: design and iterative decoding

Applied Mathematical Sciences ◽

10.12988/ams.2016.6387 ◽

2016 ◽

Vol 10 ◽

pp. 2179-2188 ◽

Cited By ~ 1

Author(s):

Fouad Ayoub ◽

Abderrazak Farchane ◽

Askali Mohamed ◽

Mostafa Belkasmi ◽

Mohammed Majid Himmi

Keyword(s):

Iterative Decoding ◽

Serially Concatenated

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The Study of Coded CPM Schemes

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.198-199.1408 ◽

2012 ◽

Vol 198-199 ◽

pp. 1408-1412

Author(s):

Lin Bo Su ◽

Jian Hua Chen ◽

Ying Peng Hu

Keyword(s):

Fading Channels ◽

Convolutional Codes ◽

Continuous Phase ◽

Coded Modulation ◽

Superior Performance ◽

Continuous Phase Modulation ◽

Codes Over Rings ◽

Constant Envelope ◽

Modulation Schemes ◽

Serially Concatenated

Continuous Phase Modulation (CPM) schemes belong to a class of constant-envelope digital modulation schemes, the constant-envelope nature of the CPM signals makes them robust for the nonlinear and fading channels, and very useful for the satellite and/or the mobile radio channels. Comparing to PSK modulation, CPM modulation can not only provide spectral economy, but also exhibit a “coding gain”. CPM can be decomposed into a Continuous Phase Encoder (CPE) followed by a Memoryless Modulator (MM), this allows many new coded modulation schemes of combination of convolutional encoder and CPM modulator to be possible, such as serially-concatenated CPM (SC-CPM), SC-CPM with Convolutional Codes over Rings, pragmatic CPM (P-CPM), Concatenation of convolutional endocder and extended CE（CCEC）, etc. Some simulations show that these new CPM schemes can offer superior performance.

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Some Extended Results on the Design of Punctured Serially Concatenated Convolutional Codes

Journal of Communications Software and Systems ◽

10.24138/jcomss.v2i3.286 ◽

2017 ◽

Vol 2 (3) ◽

pp. 235

Author(s):

Massimiliano Laddomada ◽

Bartolo Scanavino

Keyword(s):

Error Probability ◽

Selection Criteria ◽

Convolutional Codes ◽

Companion Paper ◽

Design Guidelines ◽

Effective Algorithm ◽

Signal To Noise ◽

Convolutional Encoders ◽

Simulation Results ◽

Serially Concatenated

The aim of this paper is twofold. On one hand, it presents the results of the search for good punctured systematicrecursive convolutional encoders suitable for application in serially concatenated convolutional codes (SCCCs) operating in two different target regions: at low-to moderate signal-to-noise ratios (SNRs), i.e., in the so called waterfall region, and at high SNRs. On the other hand, it provides some useful design guidelines for choosing the constituent encoders in an SCCC. The results of the search for good SCCCs operating in the waterfall region rely upon an effective algorithm, based on density evolution technique, first proposed in a companion paper. Good punctured SCCCs were obtained through considerationsdeduced by the behaviour of the bit error probability of an SCCC for high values of both SNR and interleaver length, i.e., through asymptotic considerations. The mother codes in the serial concatenation are rate 1/2 recursive convolutional encoders (RCC) found by an exhaustive search for encoders tailored to SCCC schemes, using two different selection criteria. Extensive tables of optimized puncturing patterns for various mother codes and SCCCs are presented along with sample simulation results.

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Rate-compatible LDPC convolutional codes over non-gaussian noise channel

MATEC Web of Conferences ◽

10.1051/matecconf/202030901010 ◽

2020 ◽

Vol 309 ◽

pp. 01010

Author(s):

Qiang Liu

Keyword(s):

Gaussian Noise ◽

Iterative Decoding ◽

Belief Propagation ◽

Additive White Gaussian Noise ◽

Convolutional Codes ◽

Gaussian Mixture ◽

Performance Study ◽

Shift Keying ◽

Non Gaussian ◽

The Impact

This paper is aimed to study the characteristics of the underwater acoustic channel with non-Gaussian noise channel. And Gaussian mixture model (GMM) is utilized to fit the background noise over the non-Gaussian noise channel. Furthermore, coding techniques which use a sequence of rate-compatible low-density parity-check (RC-LDPC) convolutional codes with separate rates are constructed based on graph extension method. The performance study of RC-LDPC convolutional codes over non-Gaussian noise channel and the additive white Gaussian noise (AWGN) channel is performed. Study implementation of simulation is that modulation with binary phase shift keying (BPSK), and iterative decoding based on pipeline log-likelihood rate belief propagation (LLRBP) algorithm. Finally, it is shown that RC-LDPC convolutional codes have good bit-rate-error (BER) performance and can effectively reduce the impact of noise.

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