A simple cooperative extension to wireless relaying

Herhold, P.; Zimmermann, Ernesto; Fettweis, Gerhard

doi:10.1109/izs.2004.1287382

Cited by 160 publications

(122 citation statements)

References 3 publications

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“…In the SLS-DF protocol, the relay forwards every correctly received (or reliable) symbol to the destination. Recently, the SLS-DF protocol has received considerable attention for cooperative communications (e.g., [19]- [22]). This is because the SLS-DF protocol can offer the significant performance improvement in comparison with the FLS-DF protocol [22].…”

Section: B the Sls-df Protocolmentioning

confidence: 99%

Bit and Power Loading for OFDM-Based Three-Node Relaying Communications

Tafazolli

2008

IEEE Trans. Signal Process.

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Abstract-Bit and power loading (BPL) techniques have been intensively investigated for the single-link communications. In this paper, we propose a margin-adaptive BPL approach for orthogonal frequency-division multiplexing (OFDM) systems assisted by a single cooperative relay. This orthogonal half-duplex relay operates either in the selection detection-and-forward (SDF) mode or in the amplify-and-forward (AF) mode. Maximum-ratio combining is employed at the destination to attain the achievable distributed spatial diversity-gain. Assuming perfect channel knowledge is available at all nodes, the proposed approach is to minimize the transmit-power consumption at the target throughput (average number of bits/symbol) and the target link performance. With respect to various power-constraint conditions, we investigate two distributed resource-allocation strategies, namely flexible power ratio (FLPR) and fixed power ratio (FIPR). The FLPR strategy is proposed for scenarios without individual local power constraint. The source power and relay power have a flexible ratio for each subcarrier. The FIPR strategy is proposed for scenarios with individual local power constraint. The source power and relay power have a fixed ratio for each subcarrier. Computer simulations are carried out to evaluate the proposed approach with respect to the relay location. Significant performance improvement is observed in terms of both the symbol-error-rate and the transmit-power efficiency.Index Terms-Amplify-and-forward (AF), bit and power loading (BPL), detection-and-forward, orthogonal frequency-division multiplexing (OFDM), relay.

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Section: B the Sls-df Protocolmentioning

confidence: 99%

Bit and Power Loading for OFDM-Based Three-Node Relaying Communications

Tafazolli

2008

IEEE Trans. Signal Process.

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“…In [6] Herhold et al proposed a TDR scheme, where the threshold is selected jointly with the power fraction used by the relay and the source. They determine these parameters through numerical optimization.…”

Section: Introductionmentioning

confidence: 99%

Asymptotic BER analysis of threshold digital relaying schemes in cooperative wireless systems

Onat

Fan

Yanıkömeroğlu

et al. 2008

IEEE Trans. Wireless Commun.

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Abstract-Threshold relaying is an effective technique to achieve cooperative diversity in uncoded cooperative wireless networks, which suffer from error propagation due to detection errors at the relays. This paper analyzes the asymptotic end-toend (e2e) bit error rate (BER) of threshold digital relaying. A three node network with a source, destination and relay and with links experiencing independent Rayleigh fading is considered. It is shown that, as the average link signal-to-noise ratios (SNR) are increased simultaneously, the optimal threshold that minimizes the e2e BER increases as log(SNR). The resulting e2e BER decreases as log(SNR)/SNR 2 . Moreover, any threshold of the form log(c SNR), where c is a positive constant, achieves the same order of e2e BER as the one achieved by the optimal threshold and provides dual diversity. A value of c that performs very close to the optimal threshold is also proposed.Index Terms-Cooperative diversity relaying, threshold maximum ratio combining, diversity order, selective digital relaying, SNR based selective relaying, multihop communication.

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“…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%

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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A simple cooperative extension to wireless relaying

Cited by 160 publications

References 3 publications

Bit and Power Loading for OFDM-Based Three-Node Relaying Communications

Bit and Power Loading for OFDM-Based Three-Node Relaying Communications

Asymptotic BER analysis of threshold digital relaying schemes in cooperative wireless systems

Virtual Maximum Ratio Transmission for Downlink OFDMA Relay-based Networks

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