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distributed space time coding for Wireless Two-Way Relaying

IEEE TRANSACTIONS ON SIGNAL PROCESSING 2013年第4期61卷 980-991页

作者： Muralidharan, Vijayvaradharaj T. Rajan, B. Sundar Indian Inst Sci Dept Elect Commun Engn Bangalore 560012 Karnataka India

We consider the wireless two-way relay channel, in which two-way data transfer takes place between the end nodes with the help of a relay. For the Denoise-And-Forward (DNF) protocol, it was shown by Koike-Akino et al. that adaptively changing the network coding map used at the relay greatly reduces the impact of Multiple Access Interference at the relay. The harmful effect of the deep channel fade conditions can be effectively mitigated by proper choice of these network coding maps at the relay. Alternatively, in this paper we propose a distributed space time coding (DSTC) scheme, which effectively removes most of the deep fade channel conditions at the transmitting nodes itself without any CSIT and without any need to adaptively change the network coding map used at the relay. It is shown that the deep fades occur when the channel fade coefficient vector falls in a finite number of vector subspaces of, which are referred to as the singular fade subspaces. DSTC design criterion referred to as the singularity minimization criterion under which the number of such vector subspaces are minimized is obtained. Also, a criterion to maximize the coding gain of the DSTC is obtained. Explicit low decoding complexity DSTC designs which satisfy the singularity minimization criterion and maximize the coding gain for QAM and PSK signal sets are provided. Simulation results show that at high Signal to Noise Ratio, the DSTC scheme provides large gains when compared to the conventional Exclusive OR network code and performs better than the adaptive network coding scheme.

关键词： distributed space time coding physical layer network coding wireless two-way relaying

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An OFDM based space-time Transmission Scheme for Asynchronous Cooperative Systems over Frequency-Selective Channels

An OFDM based Space-Time Transmission Scheme for Asynchronou...

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6th International Conference on Wireless Communications, Networking and Mobile Computing (WICOM)

作者： Cheng, Wenjing Huang, Qinfei Ma, Dongtang Wei, Jibo Natl Univ Def Technol Sch Elect Sci & Engn Changsha Hunan Peoples R China

ISBN: (纸本)9781424437092

This paper proposes an OFDM based transmission scheme for asynchronous amplify-and-forward cooperative systems with two relay nodes over frequency-selective channels. To combat the inter-symbol interference from multi-path fading and timing errors, the cyclic prefix (CP) is used at both the source node and relay nodes. Unlike [7] using IDFT and DFT modulation for two consecutive OFDM blocks respectively, all data blocks are modulated by IDFT at the source node and demodulated by DFT at the destination node in the proposed scheme. A subcarrier basis symbol-by-symbol ML decoding can be employed by exploiting the Alamouti code structure of two consecutive OFDM blocks at the destination node. Simulation results show that the proposed scheme can achieve diversity order 2 over frequency-selective channels in the presence of asynchronism between nodes. Moreover, we prove that the proposed scheme over frequency selective fading channel has the identical BER performance with the case of flat fading. Extension to more relay nodes is straightforward and the proposed scheme can achieve diversity order equal to the number of relay nodes.

关键词： Asynchronous Cooperative Diversity distributed space time coding Frequency-Selective Channels OFDM

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distributed space-time coded transmission for mobile satellite communication using ancillary terrestrial component

Distributed space-time coded transmission for mobile satelli...

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IEEE International Conference on Communications (ICC 2007)

作者： Kim, Hee Wook Kang, Kunseok Ahn, Do-Seob Elect & Telecommun Res Inst Taejon 305606 South Korea

ISBN: (纸本)9781424403523

A mobile satellite broadcasting service including an ancillary terrestrial component (ATC) takes advantage of the satellite's inherent capability to provide broadcast service over global coverage. We consider the downlink transmission concept using ATC with space-time code (STC) for the mobile satellite communication. We do not regard ATC as simply a repeater but consider it as an antenna for STC. First, transmission scenarios for an application of STC are represented. Next, we apply STC in the mobile satellite system including ATC and compare the system performance in the proposed architecture of ATC to that in the conventional structure. The simulation results are compared to the conventional downlink transmission concept for the mobile satellite broadcasting service.

关键词： mobile satellite communication ancillary terrestrial component distributed space time coding

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