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检索条件"主题词=Convolutional coding"

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Investigation of the Performance of Single Carrier Visible Light Communication Systems in Multi-Path Fading Optical Channels 28

Investigation of the Performance of Single Carrier Visible L...

引用

28th Signal Processing and Communications Applications Conference (SIU)

作者： Yasar, Sabiha Sinop, Hayriye Tek, Yusuf Islam Tuna, Elif Busra Karaerik, Kudret Ozen, Ali Nuh Naci Yazgan Univ Elekt Elekt Muhendisligi BOlumu HARGEM Kayseri Turkey

ISBN: (纸本)9781728172064

In this paper, the performances of single carrier visible light communication systems are analyzed in multi-path fading optical channels. Distortions in the data sent due to the multipath optical channel are corrected by linear and nonlinear channel equalizers. Computer simulations are performed to compare the equalizers with each other and to obtain the uncoded and encoded bit error rate performances. As a result of the simulation results, it was observed that the convolutional coded and Turbo coded system eliminates the error floor at each iteration.

关键词： visible light communication multipath optical channel channel equalizer convolutional coding Turbo coding

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Distance profile of multilevel coded transmission and rate design

Distance profile of multilevel coded transmission and rate d...

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IEEE Information Theory Workshop

作者： Wachsmann, U Huber, JB Ericsson Eurolab Deutschland GMBH Nurnberg Germany

ISBN: (纸本)0780344081

The analytic estimation of the error probability at the individual levels of a multilevel coding (MLC) scheme based on the distance profile in Euclidean space is given. An obvious application is to design the individual rates of an MLC scheme according to the criterion of approximately equal bit error probabilities at all levels. This so-called error probability rule is demonstrated for 16-state convolutional codes.

关键词： Error probability multilayers Euclidean space Multilevel coding convolutional coding

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Anytime Properties of Protograph-Based Repeat-Accumulate Codes

Anytime Properties of Protograph-Based Repeat-Accumulate Cod...

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IEEE Information Theory Workshop

作者： Zhang, Nan Noor-A-Rahim, Md. Vellambi, Badri N. Nguyen, Khoa D. Univ South Australia Inst Telecommun Res Adelaide SA 5095 Australia New Jersey Inst Technol Dept Elect & Comp Engn Newark NJ 07102 USA

ISBN: (纸本)9781467378529

In this paper, a highly efficient protograph-based repeat-accumulate (P-RA) anytime code is proposed, which is derived from the combination of protograph-based low-density parity-check convolutional (P-LDPCC) and spatially coupled low-density parity-check convolutional (SC-LDPCC) codes. Density evolution technique is applied to demonstrate the anytime properties of the P-RA codes over the binary erasure channel (BEC). The simulation results show that P-RA codes perform better than SC-LDPCC and P-LDPCC codes. More importantly, the finite-length performance of P-RA codes is only dependent on the decoding delay rather than the decoding message position.

关键词： convolutional codes Decoding Delays Indexes Parity check codes Reliability theory reliability theory parity check codes DEcoding convolutional coding Codes delay Parity check

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Serial Concatenation Schemes for PSK Waveforms vs. Turbo Codes

Serial Concatenation Schemes for PSK Waveforms vs. Turbo Cod...

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Conference on Wireless Sensing, Localization and Processing VII

作者： Kellerman, Fred C. Nieto, John W. Harris RF Commun Rochester NY 14610 USA

ISBN: (纸本)9780819490827

For radio communication systems, powerful error correction codes are necessary to operate in noisy and fading channel conditions. Iterative forward error correction schemes like Turbo codes can achieve near Shannon capacity performance on memory-less channels and also perform well on correlated fading channels. The key to the excellent decoding performance of the Turbo coding systems is the BCJR algorithm in conjunction with the iterative processing of soft information. A very popular modulation technique is Differential Phase Shift Key (DPSK) which is not only a simple non-coherent modulation and demodulation technique;it is also a recursive rate one code. Combining DPSK with a single convolutional code structure as an iterative inner outer forward error correction system can provide excellent Turbo like performance. Bit Interleaved Coded Modulation with Iterative Demodulation (BICM-ID), another powerful iterative technique achieves near Turbo code performance with significantly less mips. We will also introduce and compare with the latter systems yet another novel iterative scheme that utilizes coherent demodulation in conjunction with convolutional codes. This new system can easily be extended to higher order modulations such as 16 and 64 Quadrature Amplitude Modulation (QAM) while only requiring modest amounts of processing power. Monte Carlo simulation results will be shown for the Additive White Gaussian Noise (AWGN) channels.

关键词： Forward Error Correction BCJR Iterative Decoding DPSK BICM-ID convolutional coding Turbo coding coding PSK QAM

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On the Tail-Biting convolutional Code Decoder for the LTE and LTE-A Standards'

On the Tail-Biting Convolutional Code Decoder for the LTE an...

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47th Asilomar Conference on Signals, Systems, and Computers

作者： Omar, Mohamed H. El-Mahmoudy, Ahmed Seddik, Karim G. Elezabi, Ayman Varkon Semicond Cairo 11434 Egypt Amer Univ Cairo Dept Elect Engn Cairo 11835 Egypt Wimatek Syst Vancouver BC V6E 2E9 Canada

ISBN: (纸本)9781479923908

In this paper, we consider the design of the Tail-Biting convolutional Code Decoder (TB-CCD) for the Long Term Evolution (LTE) system. Tail-biting convolutional coding is used for channel coding on two downlink channels, namely the Physical Broadcast Channel (PBCH) and the Physical Downlink Control Channel (PDCCH). The decoding in the latter channel occurs blindly, with the decoder having no prior knowledge of the location of the desired bits. The crucial constraint on the TB-CCD design will be the required decoding time and the exhaustive processing for the PDCCH blind decoding. The TB-CCD will be required to carry out at most 44 decoding attempts per LTE subframe, which has a duration of 1 ms. In this paper, we describe the various aspects of our design that result in savings in processing time and complexity while showing negligible performance degradation. We then provide a description of the implementation architecture for the selected TB-CCD design and briefly describe the verification process.

关键词： convolutional coding Local thermodynamic equilibrium Long Term Evolution decoders tail biting degradation of performance DEcoding Channel coding processing time Prior Learning

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Series concatenation of 2D convolutional codes 9

Series concatenation of 2D convolutional codes

引用

IEEE 9th International Workshop on Multidimensional (nD) Systems (nDS)

作者： Climent, Joan-Josep Napp, Diego Pinto, Raquel Simoes, Rita Univ Alacant Dept Matemat Ap Correus 99 E-03080 Alacant Spain Univ Aveiro Dept Math CIDMA Ctr Res & Dev Math & Applicat P-3810193 Aveiro Portugal

ISBN: (纸本)9781479987399

In this paper we study two-dimensional (2D) convolutional codes which are obtained from series concatenation of two 2D convolutional codes. In this preliminary work we confine ourselves to dealing with finite-support 2D convolutional codes and make use of the so-called Fornasini-Marchesini input-state-output (ISO) model representations. In particular, we show that the series concatenation of two 2D convolutional codes is again a 2D convolutional code and we explicitly compute an ISO representation of the code. Within these ISO representations we study when the structural properties of reachability and observability of the two given ISO representations carry over to the resulting 2D convolutional code.

关键词： concatenated codes convolutional codes Fornasini-Marchesini input-state-output model representations ISO model representations finite support 2D convolutional codes series concatenation convolutional codes ISO Linear systems Observability Polynomials Radio frequency Trajectory convolutional coding Observability ISO Concatenated codes radiofrequency Linear system trajectory Polynomial

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Stream-oriented parallel concatenated convolutional codes

Stream-oriented parallel concatenated convolutional codes

引用

IEEE Information Theory Workshop

作者： Hall, EK Wilson, SG Univ Virginia Dept Elect Engn Charlottesville VA 22903 USA

ISBN: (纸本)0780344081

A stream-oriented parallel concatenated convolutional (Turbo) code (PCCC) is examined. The stream encoder uses continuous encoding with an interleaver constructed with using a tapped delayline. Stream decoding is envisioned using a pipeline of continuous decoding modules. Performance of the stream PCCC is examined and compared to a block-oriented scheme. Block interleaver design is addressed for continuous encoding and a class of non-block interleavers termed convolutional interleavers are considered.

关键词： interleaver pipeline PCCC convolutional coding streams DEcoding convolutional turbo code tapped delay line Parallel Lines block-oriented

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Performance of an indoor optical wireless communication system employing convolutional encoding

Performance of an indoor optical wireless communication syst...

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Photonics Global Conference (PGC)

作者： Yang, Yeon-Mo Kim, Soeun Lee, Chung Ghiu Kumoh Inst Technol Dept Elect Engn Gumi South Korea GIST APRI Nanophoton Lab Gwangju South Korea Chosun Univ Dept Elect Engn Gwangju South Korea

ISBN: (纸本)9781467325165

The optical wireless communication attracts much attention as an option for the indoor mobile communication technology. It utilizes the optical transmitter as a carrier source and photodiodes in the transmitted wavelength range as a signal detector. An indoor optical wireless communication system using convolutional coding is demonstrated by computer simulation. The data stream is coded into a convolutional code and then modulates the light from a optical transmitter. In this paper, we consider the convolutional encoding with k=1, n=2, K=3. In the receiver, a photodiode senses the optical signals transmitted from the optical transmitter and the received electrical signal is amplified. And then, the digital data is decoded. The simulation results show that the BER performance is improved by the convolutional encoding/decoding algorithm. The soft decision algorithm provides the BER improvement of approximately 2 dB compared to the hard decision algorithm.

关键词： optical wireless communication simulation convolutional coding

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Detection and Performance of Coded FSK Wireless Telemeter Signals

Detection and Performance of Coded FSK Wireless Telemeter Si...

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1st International Conference on Networking and Digital Society

作者： Liu, Wei Zhang, Chun-yang Xiang, Fei Henan Univ Sci & Technol Sch Elect Informat Engn Luoyang 471003 Henan Peoples R China

ISBN: (纸本)9780769536354

The noncoherent symbol-by-symbol maximum a posteriori (MAP) detection and the soft-decision Viterbi decoding in a convolutionally coded frequency shift-keying (FSK) telemeter system are studied and the performance of coded FSK telemeter system in flat Rayleigh-fading channel is also analyzed. The coded bit metrics of FSK signal are calculated by MAP detector, and the bit metrics are applied in realization of soft-decision Viterbi decoding. The results show that the reliability of FSK telemeter system can be improved by MAP detection and soft-decision Viterbi decoding. Compared with the envelop detection and hard-decoding of coded FSK signal over flat Rayleigh -fading channel, the potential gain of 6-8dB can be obtained by using MAP detection and soft-decision Viterbi detection.

关键词： wireless telemetry frequency shift keying convolutional coding maximum a posteriori detection Viterbi decoding

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A state space approach for constructing MDS rate 1/n convolutional codes

A state space approach for constructing MDS rate 1/n convolu...

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IEEE Information Theory Workshop

作者： Smarandache, R Rosenthal, J Univ Notre Dame Dept Math Notre Dame IN 46556 USA

In this paper we provide a state space approach for constructing convolutional codes of rate 1/n and complexity delta, whose free distance is n(delta + 1), the maximal possible free distance.

ISBN: (纸本)0780344081

In this paper we provide a state space approach for constructing convolutional codes of rate 1/n and complexity delta, whose free distance is n(delta + 1), the maximal possible free distance.

关键词： State-space methods convolutional coding

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