Optimal SNR-based selection relaying scheme with M-ary modulations in cooperative wireless networks

Bastami, Ali H.; Olfat, Ali

doi:10.1049/iet-com.2010.0233

Cited by 11 publications

(14 citation statements)

References 18 publications

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“…(54) leads to equation (17) for optimal threshold computation. (21) In this appendix, similar to Appendix D, we prove relation (21) . The relations (55) through (58) show how the proof proceeds at the bottom of the page.…”

Section: Appendix B Proof Of Relation (13)mentioning

confidence: 84%

“…We consider linear M-ary modulation schemes and the optimum threshold can be computed by (21). We assume equal energy per bit for all constellations, i.e., E b = 1 and therefore for constellation Ω = {s 1 , s 2 , .…”

Section: Simulation Resultsmentioning

confidence: 99%

“…Selection relaying is an alternative for optimal or near-optimal detectors (cooperative maximal ratio combiner for example) [20]. However, proper selection of the threshold plays a key role in the performance of cooperative systems based on selection relaying [21], [22]. A novel decoding algorithm for a cooperative decode-and-forward beamforming system that takes the potential errors in forwarded signals into account in the computation of the likelihood ratio of coded bits is proposed in [23].…”

Section: Introductionmentioning

confidence: 99%

“…By substitution of (71) and (72) in equation (21) and using Q √ 2γ t ≈ 1 2 e −γt and then taking logarithms of both sides of the equation, we obtain…”

mentioning

confidence: 99%

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Cooperative Beamforming for Two-Hop Multi-Relay Decode-and-Forward Networks

Moharrer

Olfat

Beaulieu

2015

IEEE Trans. Commun.

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Cooperative communication through relaying can improve the performance of communication systems under multipath fading conditions. Increasing the number of relays will also boost the performance of the system but since relays transmit through orthogonal channels this improvement is at the cost of bandwidth or rate of the system. A two hop multi-relay decode-and-forward cooperative system is proposed in which selected relays transmit simultaneously in the same band and, therefore, there is no rate or bandwidth loss. To mitigate the error propagation due to incorrect decoding of symbols at the relays we use a selection relaying method in which a relay transmits in the second hop if the channel quality between that relay and source exceeds a minimum threshold regardless of the relaydestination link. In our proposed beamforming scheme, the phase of selected relays for transmission in the second hop are adjusted to compensate for the channel between relay and destination and achieve the best performance at the destination using only a simple MRC receiver. The relays use only two-bit quantized phase information of the channel gain between the relay and destination, that can be sent to the relays by the destination. The general family of M-QAM modulation constellations is considered in the performance and diversity analysis. It is proved that the scheme achieves full diversity order and closed-form expressions for the thresholds that achieve full diversity are found. . He is an asscciate professor at communication engineering department and director of Signal Processing and Communication Systems Laboratory. He has served as director of communication engineering deprtment between 2012 and 2014. His research interests are cooperative communications, Information theory, statistical and adaptive signal processing, array signal processing, detection and estimation theory and MIMO communication systems.

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Section: Appendix B Proof Of Relation (13)mentioning

confidence: 84%

Section: Simulation Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…By substitution of (71) and (72) in equation (21) and using Q √ 2γ t ≈ 1 2 e −γt and then taking logarithms of both sides of the equation, we obtain…”

mentioning

confidence: 99%

See 2 more Smart Citations

Cooperative Beamforming for Two-Hop Multi-Relay Decode-and-Forward Networks

Moharrer

Olfat

Beaulieu

2015

IEEE Trans. Commun.

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“…Some researchers considered other ways to prevent the forwarding of erroneous data in practical DF cooperation networks. On one hand, some adaptive/selective relaying techniques were proposed, including the link-adaptive relaying [7][8][9] and threshold-based relaying [1,[10][11][12][13][14][15]. Both approaches are executed at the relay and utilise some instantaneous channel state information (CSI) of the cooperation network to evaluate the reliability of the data received by the relay.…”

Section: Introductionmentioning

confidence: 99%

Detection with erasure for error‐propagation mitigation in decode‐and‐forward relaying with general pulse amplitude‐modulated/quadrature amplitude‐modulated signals

Lee

Shieh

2014

IET Communications

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In the research of decode-and-forward (DF) cooperative communications, it is often supposed that the included relay only transmits correctly decoded signals. This simplifies the analysis of DF cooperation. However, in practical circumstances, erroneous messages may be forwarded which makes the decision at the destination even worst. In this study, the authors formulate a special detection way, named 'detection with erasure', to make certain that the relay-forwarded signals are mostly correct. Specifically, whenever the decoded result at the relay falls into some preset 'erasure regions', the relay will not process and transmit it anymore. This effectively prevents the forwarding of erroneous messages. With general pulse amplitude-modulated or squared quadrature amplitude-modulated signals, the authors demonstrate that these erasure regions can be adjusted to minimise the end-to-end symbol error rate (SER). This detection scheme can be extended to be used in the DF cooperation employing multiple relays as well. Simulations reveal that in terms of the end-to-end SER performance, the proposed detection with erasure can outperform some signal-to-noise ratio threshold-based relaying approaches, and can perform quite similarly as compared with those decoding/combining methods realised at the destination with the advantage of less channel state information exchange.

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On the performance of space‐time coding and threshold‐based selection relaying in cooperative networks with multiple antenna relays

Gilan

Olfat

2018

Trans Emerging Tel Tech

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In this paper, a threshold‐based selection relaying scheme that employs space‐time coding (STC) strategy is considered in a decode and forward (DF) cooperative network with multiple‐input–multiple‐output relays. One of the serious imperfections affecting these systems is error propagation on the source‐relay link, which culminates in intersymbol interference (ISI). Two scenarios are studied. In the first scenario, a new beamforming method is proposed for removing ISI between symbols of distributed space‐time coding scheme caused by erroneous detection of symbols at relays. It is demonstrated that this system is more power efficient in comparison to other systems without beamforming. In the second scenario, a new central STC that we nominate its orthogonal‐STC generator is proposed for multiple‐input–multiple‐output relays. The proposed new transmission scheme, in this case, removes ISI between symbols, which significantly mitigates the adverse effects of error propagation in DF relay networks. A closed‐form expression for end‐to‐end bit error rate of the system is derived for both scenarios. The asymptotic behavior analysis of the system shows that the threshold‐based selection relaying scheme in the second scenario, which uses a simple maximal ratio combining, by employing proper thresholds derived in the paper, achieves full diversity order 2M + 1 in the DF relay network with M relays. Numerical results show an excellent agreement between analytical and simulation results. There is 4 dB power saving at bit error rate of 10−4 for the second scenario compared with the first one and it outperforms other existing works.

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Optimal SNR-based selection relaying scheme with M-ary modulations in cooperative wireless networks

Cited by 11 publications

References 18 publications

Cooperative Beamforming for Two-Hop Multi-Relay Decode-and-Forward Networks

Cooperative Beamforming for Two-Hop Multi-Relay Decode-and-Forward Networks

Detection with erasure for error‐propagation mitigation in decode‐and‐forward relaying with general pulse amplitude‐modulated/quadrature amplitude‐modulated signals

On the performance of space‐time coding and threshold‐based selection relaying in cooperative networks with multiple antenna relays

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