Smart Regenerative Relays for Link-Adaptive Cooperative Communications

Wang, Tairan; Wang, Renqiu; Giannakis, Georgios B.

doi:10.1109/ciss.2006.286619

Cited by 61 publications

(108 citation statements)

References 18 publications

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“…In relation to this, various relay schemes, such as nonregenerative amplify-and-forward (AF), regenerative decode-and-forward (DF), selective decode-and-forward (SDF), and compress-and-forward (CF), have been studied in [1]- [6]. The nonregenerative AF relay scheme employed in this current paper is a more popular and realistic protocol due to no required signal processing at the relay nodes for decoding and compressing procedures compared to the other three relay schemes.…”

Section: Introductionmentioning

confidence: 99%

MMSE-Based amplifying relay matrix for noncooperative AF wireless relay network under power constraints

Lee

Kwon

Wang

2011

2011 IEEE Symposium on Computers and Communications (ISCC)

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Abstract-This paper derives analytically an optimum amplifying relay matrix using the minimum mean square error (MMSE) criteria for a noncooperative amplify-and-forward (AF) distributed relay network. Global and local power constraints are included in the analysis. And a one-source-one-destination node pair and -relay network is considered. Because the relays are noncooperative, this paper exploits the diagonal property in an amplifying relay matrix for the optimum matrix derivation. Then, this paper claims that the bit error rate of the AF network using the proposed amplifying relay matrix is significantly better than that of the AF network with the other existing amplifying matrices.Index Terms-Amplify-and-forward, minimum mean square error, amplifying relay matrix, power constraint.

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Section: Introductionmentioning

confidence: 99%

MMSE-Based amplifying relay matrix for noncooperative AF wireless relay network under power constraints

Lee

Kwon

Wang

2011

2011 IEEE Symposium on Computers and Communications (ISCC)

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“…Existing techniques for mitigating error propagation can be classified into two groups. The first of these comprises selective and adaptive relaying techniques, which include link adaptive relaying (LAR) [4], [5] and threshold digital relaying (TDR) [9]- [11]. Both techniques use link SNRs to evaluate the reliability of the data received by the relay.…”

Section: Introductionmentioning

confidence: 99%

Threshold Based Relay Selection in Cooperative Wireless Networks

Onat

Fan

Yanıkömeroğlu

et al. 2008

IEEE GLOBECOM 2008 - 2008 IEEE Global Telecommunications Conference

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Abstract-This paper considers two-hop cooperative relaying using multiple relays and proposes a threshold based relay selection protocol. In this protocol the relays are selected among those having received SNR higher than a threshold value. The relay selection is performed by the destination based on the received SNRs at the destination during the last hop. The exact bit error rate of this protocol is derived and it is shown that it achieves full diversity order. Unlike some other full diversity achieving protocols in the literature, the requirement that the exact/average SNRs of the source-relay links be known at the destination is eliminated using an appropriate SNR threshold. I. INTRODUCTIONCooperative relaying can induce spatial diversity in wireless networks without any reliance on multiple antennas. Various decode-and-forward protocols have been proposed based on selective relaying, distributed space-time coding and relay selection, and have been shown to achieve full diversity [1]- [3]. Recently, detection aspects of cooperative relaying have been analyzed [4]-[8]. These works study digital (or demodulate-and-forward) cooperative relaying protocols, in which the relaying does not rely on any error correction or detection codes. Such protocols are particularly attractive for wireless sensor networks, for which coded transmission can be costly due to severe energy limitations.Unlike ideal decode-and-forward relaying, in digital relaying the relays can forward erroneous information, and with a conventional combining scheme such as Maximal Ratio Combining (MRC), these errors propagate to the destination, causing end-to-end (e2e) detection errors. Existing techniques for mitigating error propagation can be classified into two groups. The first of these comprises selective and adaptive relaying techniques, which include link adaptive relaying (LAR) [4], [5] and threshold digital relaying (TDR) [9]-[11]. Both techniques use link SNRs to evaluate the reliability of the data received by the relay. In TDR a relay forwards the received data only when its received SNR is above a threshold value. In LAR the relay transmits with a fraction α of its maximum transmit power, where α depends on the source-relay and relay-destination SNRs. In [4], a function for calculating α

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“…As recognized in [5], performance analysis and implementation of such detector are quite complicated and thus, a suboptimum combiner termed as λ-MRC was derived. Another suboptimum detector is the Cooperative MRC (C-MRC) [15] and Link Adaptive Regeneration (LAR) [16]. In these works, the collaboration is performed at the destination, i.e., the receiver treats the relays as a multiple-source transmitter and tries to combine the multiple received signals to obtain the best performance.…”

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confidence: 99%

“…Relay schemes can be categorized into three different groups: Amplify-and-Forward (AF) [7,8,12,[15][16][17][18], Compress-and-Forward (CF) [21,9] and Decode-and-Forward (DF) [5-7, 10,11,13,20]. In the AF schemes, relays amplify (and sometimes transform [8]) the received signal and broadcast it to the destination.…”

mentioning

confidence: 99%

“…Jointly with Orthogonal Frequency Division Multiplexing (OFDM) [3] or Orthogonal Frequency Division Multiple-Access (OFDMA) [4] it can also provide reliability. Additionally, the idea of increasing coverage, capacity and reliability in future wireless networks by using cooperative single-antenna relays has recently attracted much attention [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20].…”

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confidence: 99%

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Virtual Maximum Ratio Transmission for Downlink OFDMA Relay-based Networks

Jiménez

Gameiro

Armada

2010

Wireless Pers Commun

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In this paper, a novel and practical transmission scheme for a Multiple Input Multiple Output-Orthogonal Frequency Division Multiple Access (MIMO-OFDMA) relaybased network is proposed and evaluated. We coin the term Virtual Maximum Ratio Transmission (VMRT) for the scheme which obtains diversity and array gain at both links in a two-hop transmission, while keeping the complexity low. Besides, the requirements of Channel State Information needed at the different network elements such as the Base Station, Relay Station or User Terminals are also limited, and so the feedback. The obtained global performance by using proposed VMRT outperforms other schemes. Diversity gains larger than 6 can be easily obtained with a reduced number of relays. For this reason, VMRT is a good candidate to achieve high speed transmission or increase coverage and reliability in slow varying channels for relay-based networks.

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Smart Regenerative Relays for Link-Adaptive Cooperative Communications

Cited by 61 publications

References 18 publications

MMSE-Based amplifying relay matrix for noncooperative AF wireless relay network under power constraints

MMSE-Based amplifying relay matrix for noncooperative AF wireless relay network under power constraints

Threshold Based Relay Selection in Cooperative Wireless Networks

Virtual Maximum Ratio Transmission for Downlink OFDMA Relay-based Networks

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