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IEEE International Conference on Computer and Information Technology (CIT 2014)

作者： Li, Lingyun Hou, Shujuan Yang, Peiyao Beijing Inst Technol Sch Informat & Elect Beijing 100081 Peoples R China

ISBN: (纸本)9781479962396

A novel distributed turbo code (DTC), called dual-systematic bits DTC (DS-DTC), is proposed for a two-hop relay system. The source broadcasts a punctured turbo code to both relay and destination. After iterative decoding the received codes, the relay forwards the systematic bits to the destination in case of successful cyclic redundancy check (CRC). And a modified turbo decoder based on double versions of systematic bits is designed at destination in order to make full use of the information coming from source and relay. The superiority of the proposed DS-DTC to conventional DTC and punctured DTC is revealed through simulations.

关键词： relay distributed turbo code error propagation

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Multiple-Access Relay System based on Nested distributed turbo code

Multiple-Access Relay System based on Nested Distributed Tur...

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IEEE Radio and Wireless Symposium (RWS)

作者： Ishii, K. Ishibashi, K. Ochiai, H. Kagawa Univ 2217-20 Hayashi Cho Takamatsu Kagawa 7610396 Japan Shizuoka Univ Hamamatsu Shizuoka 4328561 Japan Yokohama Natl Univ Yokohama Kanagawa 4328561 Japan

ISBN: (纸本)9781424476855

We propose a novel cooperative protocol with the joint channel and network code for the multiple-access relay channel with two sources, one relay, and one destination. In the proposed cooperation, by using a superposition technique, the relay node combines the information from both sources and forwards it to the destination, simultaneously. Although several superposition techniques have been proposed (e.g., superposition modulation, network coding), we will utilize a modified nested coding scheme which can be applied to iterative decoding. In the proposed relay system, the decoding operation at the destination node is adaptively changed according to the decoding results of each direct link (from source to destination channel), but the structures of sources and relay are not changed. If the one of the direct links is in failure, the system can be operated as just the distributed turbo coding proposed for the simplest relay channel with one source, one relay and one destination. Even if both direct links are in failure, the destination can still iteratively decode both sources' data with three received signals from individual sources and relay. Simulation results reveal that the proposed system can significantly improve the performance.

关键词： Multiple-access relay channel superposition technique distributed turbo code nested code

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Bit error probability of distributed turbo coded relay systems over quasi-static Rayleigh fading channels

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The Journal of China Universities of Posts and Telecommunications 2010年第2期17卷 41-45页

作者： PENG Yue-xing WU Mu-zi ZHAO Hui WANG Wen-bo Wireless Signal Processing and Network Laboratory Key Lab of Universal Wireless Communications Ministry of Education School of Information and Communication Engineering Beijing University of Posts and Telecommunications Beijing 100876 China

As is known, distributed turbo coding （DTC） performs close to the theoretic outage probability bound of a relay channel when correct decoding is assumed at the relay. However, decoding error is inevitable in practical fading channels due to the error-prone feature of radio channels, and the decoding error propagation in DTC scheme will severely degrade the error performance of the relay system. As a result, it is necessary to evaluate the error performance of the DTC scheme in multi-hop relaying wireless systems in practical fading channels. Moreover, the theoretical method of analysis provides an effective tool for obtaining the error performance besides lengthy simulations. In this article, the concept of equivalent signal-to-noise ratio （SNR） of the two-hop relay channel and the method of computing equivalent SNR are developed, and then the upper bound on the bit error probability （BEP） of DTC relay systems is analyzed by use of turbo code＇s distance spectrum, the concept of uniform interleaver, the limit-before-averaging technique, and the union bound method. Both theoretical analysis and numerical simulation are implemented for relay systems with DTC scheme over quasi-static Rayleigh fading channels. The results show that the upper bound approaches the simulation results in the medium to high SNR region.

关键词： bit error probability distributed turbo code relay network union bound distance spectrum SNR

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A Pre-BSC Model for distributed turbo codes

A Pre-BSC Model for Distributed Turbo Codes

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69th IEEE Vehicular Technology Conference

作者： Hoshyar, Reza Tafazolli, Rahim Univ Surrey Dept Elect Engn CCSR Guildford GU2 7XH Surrey England

ISBN: (纸本)9781424425167

A model that effectively captures the relay decoding error is proposed for a distributed turbo code (DTC) over a cooperative relay channel. The model consists of a memoryless binary symmetric channel (BSC) placed before the relay encoder, hence called pre-BSC. Accordingly the required iterative decoder is derived that consists of an extra update function to be applied on extrinsic information before their exchange. The derived update function is in form of a smooth clipping and therefore the overall decoder is called clipped iterative decoder (clipped ID). Clipped ID is robust to the relay decoding error and is able to significantly improve the final performance, especially when source-to-relay link becomes erroneous.

关键词： Relay Channels cooperative DF distributed turbo code robustness

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turbo codes with Modified code Matched Interleaver for coded-Cooperation in Half-Duplex Wireless Relay Networks

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FREQUENZ 2015年第3-4期69卷 171-184页

作者： Ejaz, Saqib Yang, Feng-Fan Nanjing Univ Aeronaut & Astronaut Coll Elect & Informat Engn Nanjing 210016 Jiangsu Peoples R China

The parallel encoding and decoding structure of turbo codes makes them natural candidate for code-dcooperative scenarios. In this paper, we focus on one of the key components of turbo codes i.e., interleaver, and analyze its effect on the performance of coded-cooperative communication. The impact of an interleaver on the overall performance of cooperative systems depends on the type of an interleaver and its location in the cooperative encoding scheme. We consider code matched interleaver (CMI) as an optimum choice and present its role in a coded-cooperation scenario. The search and convergence of CMI for long interleaver sizes is an issue;therefore, a modification in the search conditions is included without any compromise on the performance of CMI. We also present analytical method to determine maximum S-constraint length for a CMI design. Further, we analyze the performance of two different encoding schemes of turbo codes, i.e., distributed turbo code (DTC) and distributed multiple turbo code (DMTC) after inclusion of CMI. Monte Carlo simulations show that CMI increases the diversity gain relative to other conventional interleavers such as uniform random interleaver. The channel is assumed to be Rayleigh fading among all communication nodes.

关键词： coded-cooperation code matched interleaver cooperation diversity distributed turbo code multiple turbo codes joint parallel iterative decoding

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A Tutorial on Lossy Forwarding Cooperative Relaying

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IEEE COMMUNICATIONS SURVEYS AND TUTORIALS 2019年第1期21卷 66-87页

作者： He, Jiguang Tervo, Valtteri Zhou, Xiaobo He, Xin Qian, Shen Cheng, Meng Juntti, Markku Matsumoto, Tad Univ Oulu Ctr Wireless Commun Oulu 90014 Finland Nokia Mobile Networks Oulu 90650 Finland Tianjin Univ Sch Comp Sci & Technol Tianjin Key Lab Adv Networking Tianjin 300350 Peoples R China Anhui Normal Univ Sch Math & Comp Sci Wuhu 241000 Peoples R China Japan Adv Inst Sci & Technol Sch Informat Sci Nomi Ishikawa 9231292 Japan Japan Adv Inst Sci & Technol Nomi Ishikawa 9231292 Japan

Lossy decode-and-forward (DF) relaying, also referred to as lossy forwarding (LF), can significantly enhance the transmission reliability and expand the communication coverage at the cost of a small increase in computational effort compared to its DF counterpart. Furthermore, it can further simplify the operations at the relay nodes by removing the error-detecting operation, e.g., cyclic redundancy check, which is used in the conventional DF systems. Due to these advantages, LF has been intensively investigated with the aim of its applications to various cooperative communication networks with different topologies. This paper offers a comprehensive literature review on the LF relaying strategy and makes comparisons between LF and DF. Five basic exemplifying scenarios are taken into consideration. These are the three-node network, the single-source multi-relay network with direct source-to-destination link, the multiple access relay channel, the two-way relay network, and the general multi-source multi-relay network. The paper includes not only theoretical performance limit analyses, but also performance evaluation by employing low-complexity accumulator aided turbo codes at the sources and relays as well as joint decoding at the destination. As expected, the performance enhancement in terms of outage probability, frame error rate, and epsilon-outage achievable rate by LF over DF is significant, which is demonstrated in all the exemplifying scenarios in the literatures. Hence LF has a great potential to be applied to future 5G wireless communication networks, e.g., device-to-device, vehicle-to-vehicle, and machine-type communications, which are composed of the aforementioned exemplifying scenarios.

关键词： Decode-and-forward distributed turbo code joint decoding lossy forwarding lossy source-channel separation theorem multiple access relay channel Slepian-Wolf source coding with a helper

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Performance Analysis for coded Cooperative Multiple-Relay in distributed turbo Channels

Performance Analysis for Coded Cooperative Multiple-Relay in...

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22nd IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)

作者： Li, Chang Wang, Yafeng Xiang, Wei Yang, Dacheng Network Management Center China Mobile Hebei China Wireless Theories and Technologies Lab. Beijing University of Posts and Telecom. China Faculty of Engineering and Surveying University of Southern Queensland Toowoomba QLD Australia

ISBN: (纸本)9781457713484

Diversity is an effective technique to enhance link quality and increasing network capacity. In this paper, we propose a generalized distributed turbo codes (DTC)-based coded cooperation protocol for two-hop relay networks with an arbitrary number of relays. This scheme aims at achieving improved diversity over the classical coded cooperation method in Rayleigh fading channels. We develop a closed-form expression for the pairwise error probability (PEP) and a tight upper bound for the bit error rate (BER) using DTC. The results demonstrate the merits of DTC-based coded cooperation with multiple relays, under various relay and uplink channel conditions. Moreover, the analytical upper bounds are validated with simulation results.

关键词： bit error rate channel coding coded cooperation distributed turbo code fading channels multiple relays pairwise error probability

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distributed turbo Coding Techniques with HARQ at Relays for LTE-A

Distributed Turbo Coding Techniques with HARQ at Relays for ...

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77th IEEE Vehicular Technology Conference (VTC)

作者： Maret, Luc Ktenas, Dimitri CEA Leti F-38054 Grenoble France

ISBN: (纸本)9781467363372

Advanced relaying concepts that enhance capacity on top of coverage need to be investigated in future releases of LTE-Advanced. In this context, the challenge of our work is to design novel distributed HARQ protocols for cooperative transmissions. The analysis will focus on a relay channel in which source and relay cooperatively construct a distributed turbo code (DTC), but the proposed strategy could be extended to other forward error correction (FEC) schemes. What we propose is to exploit the instantaneous mutual information knowledge at the receiver location. Then in order to select the node that retransmits we check the quality not only of the relay-to-destination channel, but also of the source-to-destination one. Moreover, outage probability is considered to evaluate the link quality between relay and destination and to estimate/predict if retransmission will fail. Simulation results show that the proposed distributed HARQ protocols can significantly enhance the User Equipment (UE) throughput and residual Packet Error Rate (PER).

关键词： LTE-A HARQ distributed turbo code relay cooperative communications

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distributed turbo Coding Techniques with HARQ at Relays for LTE-A

Distributed Turbo Coding Techniques with HARQ at Relays for ...

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IEEE Vehicular Technology Conference

作者： Luc Maret Dimitri Kténas CEA-Leti MINATEC Campus 17 rue des Martyrs F-38054 Grenoble France

ISBN: (纸本)9781467363365

关键词： LTE-A HARQ distributed turbo code relay cooperative communications HARQ relay relay channel cooperative communication Distribute

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Performance Analysis for coded Cooperative Multiple-Relay in distributed turbo Channels

Performance Analysis for Coded Cooperative Multiple-Relay in...

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IEEE International Symposium on Personal, Indoor and Mobile Radio Communications

作者： Chang Li Yafeng Wang Wei Xiang Dacheng Yang Network Management Center Wireless Theories and Technologies Lab Beijing University of Posts and Telecom Faculty of Engineering and Surveying University of Southern Queensland

ISBN: (纸本)9781457713460

关键词： Bit error rate Channel coding coded cooperation distributed turbo code Fading channels Multiple relays Pairwise error probability

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