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adaptive coding scheme for wireless LANs with CSMA/CA MAC protocol

ELECTRONICS LETTERS 1998年第15期34卷 1450-1452页

作者： Liu, YS Wu, SW Chung Yuan Christian Univ Dept Elect Engn Chungli 32023 Taiwan

The generalised type II hybrid automatic repeat-request scheme based on rate-compatible convolutional codes is used to achieve adaptive error protection in wireless local access networks (LANS) with the CSMA/CA protocol. Simulation results show that this coding scheme is a suitable error control method for wireless LANs where the channel state is unpredictable.

关键词： Protocols wireless local access networks BER wireless LANs error statistics fading channel model digital radio Multiple access communication error control method bit error rate Codes Computer communications adaptive coding scheme automatic repeat-request scheme adaptive error protection wireless LAN rate-compatible convolutional codes convolutional codes CSMA/CA MAC protocol automatic repeat request Radio links and equipment Local area networks generalised type II hybrid ARQ scheme carrier sense multiple access fading Information theory telecommunication channels adaptive codes

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adaptive Rate-Compatible Non-Binary LDPC coding scheme for the B5G Mobile System

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SENSORS 2019年第5期19卷 1067-1067页

作者： Zhao, Dan-feng Tian, Hai Xue, Rui Harbin Engn Univ Coll Informat & Commun Engn Harbin 150001 Heilongjiang Peoples R China

This paper studies an adaptive coding scheme for B5G (beyond 5th generation) mobile system-enhanced transmission technology. Different from the existing works, the authors develop a class of rate-compatible, non-binary, low-density parity check (RC-NB-LDPC) codes, which expresses the strong connection between the algebra-based and graph-theoretic-based constructions. The constructed codes can not only express rate-compatible (RC) features, but also possess a quasi-cyclic (QC) structure that facilitates the encoding implementation. Further, in order to achieve the code rate-adaptive allocation scheme, the authors propose using the K-means++ clustering algorithm to cluster different channel environments, considering various factors that affect channel characteristics. Finally, in order to present the advantages of the adaptive coding scheme, the authors construct a coding scheme for image transmission. The numerical results demonstrate that the developed code can obtain better waterfall performance in a larger code rate range, which is more suitable for data transmission;the adaptive coding transmission scheme can obtain higher reconstructed image quality compared to the fixed code rate-coding scheme. Moreover, when considering unequal error protection (UEP), the proposed scheme can further improve the reconstructed image quality.

关键词： B5G adaptive coding scheme channel clustering k-means plus plus algorithm rate-compatible LDPC

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Analytical Investigation of All-Optical FEC coding scheme with Convolutional Code

Analytical Investigation of All-Optical FEC Coding Scheme wi...

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2015 International Conference on Photonics in Switching (PS)

作者： Aikawa, Yohei Uenohara, Hiroyuki Tokyo Inst Technol Precis & Intelligence Lab Midori Ku 4259 Nagatsuda Yokohama Kanagawa 2260026 Japan

ISBN: (纸本)9781479988211

In this paper, we propose an optical forward-error-correction (FEC) coding scheme with convolutional code using FWM in a HNLF to realize adaptive coding scheme corresponding to the signal-to-noise ratio between nodes. The performance of the proposed scheme was analytically investigated for 2(11) -1 PRBS DPSK-modulated RZ format signals at 10Gbps. The insertion losses of the FEC coding circuit were approximately 0.5 and -0.8dB at BER = 10(-9) in the cases of two-and three-input optical XOR operations, respectively, indicating that the proposed scheme offers a net coding gain.

关键词： convolutional codes differential phase shift keying encoding forward error correction optical fibre networks optical logic BER FEC coding circuit FWM HNLF PRBS DPSK-modulated RZ format signals adaptive coding scheme all-optical FEC coding bit rate 10 Gbit/s convolutional code forward-error-correction coding scheme insertion losses optical XOR signal-to-noise ratio adaptive optics Encoding Logic gates Optical attenuators Optical mixing Optical sensors

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Variable LDPC coding rate performances for multicarrier systems using HD decoding

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IEE PROCEEDINGS-COMMUNICATIONS 2006年第1期153卷 69-73页

作者： Cances, JP Meghdadi, V Univ Limoges ENSIL F-87068 Limoges France

An adaptive coding scheme minimising the BER of a bit-interleaved coded modulation OFDM system performing hard-decisions (HD) after the demodulation and ideal interleaving is proposed. The subcarrier code rate levels subject to a rate constraint are varied according to perfect channel state information at the transmitter. The derived adaptive scheme uses low-density parity-check codes. A modified bit-flipping algorithm provides HD decoding and can be applied either alone or combined with a power loading scheme. It is shown by Monte Carlo simulations that, for broadband systems with Rayleigh fading, the loading procedure provides a signal-to-noise ratio gain up to 3dB for in average BER level of 10(-5).

关键词： adaptive coding scheme bit-interleaved coded modulation Game theory channel coding variable rate codes bit error rate BICM parity check codes Monte Carlo simulation modulation coding multicarrier system OFDM modulation broadband system power loading scheme adaptive codes interleaved codes OFDM system low-density parity-check code Monte Carlo methods broadband networks Rayleigh channels decision theory hard-decision decoding error statistics perfect channel state information BER decoding demodulation bit-flipping algorithm Rayleigh fading LDPC transmitter Codes Radio links and equipment orthogonal frequency division multiplexing

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