Effect of Feedback Delay on the Performance of Cooperative Networks with Relay Selection

Seyfi, Mehdi; Muhaidat, Sami; Liang, Jie; Dianati, Mehrdad

doi:10.1109/twc.2011.101711.100901

Cited by 51 publications

(28 citation statements)

References 24 publications

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“…The relays decode the received signal, perform a CRC check and verify the credibility of their decoded signal. Then the best relay is selected based on the criterion mentioned in (9) and (10). The selected relay forwards its decoded symbol to the end source nodes.…”

Section: Average Symbol Error Ratementioning

confidence: 99%

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Noncoherent relay selection for bidirectional cooperative networks

Seyfi

Muhaidat

Liang

et al. 2012

2012 IEEE Globecom Workshops

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In this paper we propose a new noncoherent relay selection strategy for two-way relay cooperative networks. In our proposed scenario, channel state information (CSI) or feedback link is not needed, neither for relay selection nor for data detection. We assume M -ary frequency shift keying (FSK) modulation for our transmission scheme and decodeand-forward (DF) protocol for our system relaying method. Relay selection is performed based on a min-max criterion on the received instantaneous signal energies at the relay nodes. Furthermore, by using energy detectors at both destination nodes the transmitted signal is decoded. We present a closedform formula for the average symbol error rate (ASER) of the proposed noncoherent selection method. We also provide high signal-to-noise-ratio (SNR) analysis and the achievable diversity order for the proposed selection method. Finally we present a simulation study to corroborate the analytical results and to demonstrate the performance of the introduced noncoherent selection method.Index Terms-Noncoherent relay selection, cooperative communication, relay selection, average symbol error rate.

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Section: Average Symbol Error Ratementioning

confidence: 99%

“…Because of the time varying nature of the channel, any delay in the feedback link may cause an erroneous selection of the relay. Since the channel condition may change and the selected relay may not yet be the best relay for cooperation [10].…”

Section: Introductionmentioning

confidence: 99%

Noncoherent relay selection for bidirectional cooperative networks

Seyfi

Muhaidat

Liang

et al. 2012

2012 IEEE Globecom Workshops

Self Cite

View full text Add to dashboard Cite

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“…The effect of outdated CSI on AF OR was analyzed in [10]- [13]. In [14], [15], both channel estimation errors and outdated CSI were considered 0090-6778 © 2014 IEEE. Personal use is permitted, but republication/redistribution requires IEEE permission.…”

Section: Introductionmentioning

confidence: 99%

Cooperative Distributed Beamforming With Outdated CSI and Channel Estimation Errors

Kim

Choi

Cioffi

2014

IEEE Trans. Commun.

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This paper investigates the effect of imperfect channel state information (CSI) on the outage performance of cooperative distributed beamforming (DBF). The acquisition of perfect CSI is disturbed by outdated CSI and channel estimation errors. Decode-and-forward relays are considered with individual power constraints at each relay. Considering a training-and-feedback strategy to acquire CSI, a closed-form approximate expression for outage probability and the achievable diversity gain are first provided under Rayleigh fading channels. Numerical observations verify that the approximation is very tight. It is shown that outdated CSI seriously degrades the performance, and therefore, the outage probability is bounded and no diversity is achieved. Conversely, channel estimation errors cause slight performance degradation, and full diversity order is still achievable. However, even when CSI is outdated, it is shown that the asymptotic outage decreases as the number of relays K increases, where the logarithm of the outage probability decreases at the rate of K log K. This paper shows that, when the destination re-estimates the current CSI for decoding, the effect of outdated CSI is greatly mitigated and consequently achieves a diversity gain of one. To re-estimate the current CSI with small overhead, the beamformed training sequence (BFTS) strategy is proposed, in which a new closed-form formula for minimum-mean-square-error estimation is presented using Gaussian approximation. Numerical results verify that the outage performance with the proposed BFTS scheme is close to that of a perfect estimation. A closed-form outage expression of DBF with the proposed BFTS scheme is also presented under an assumption of high-signal-to-noise ratio (SNR), but the expression is very tight even in low-to-moderate SNR regimes.Index Terms-Cooperative relaying, distributed beamforming, outdated CSI, channel estimation errors, minimum mean square error, outage probability, diversity order.

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“…Vicario et al derived a closed-form expression of outage probability for decode-and-forward (DF) ORS with outdated CSI [5]. Seyfi et al investigated the impact of feedback delay and channel estimation errors on the system performance [6], [7]. In [8], Kim error rate.…”

Section: Introductionmentioning

confidence: 99%

An MGF-Based Performance Analysis of Opportunistic Relay Selection with Outdated CSI

Jiang

Cao

Kaiser

2014

2014 IEEE 79th Vehicular Technology Conference (VTC Spring)

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Up to now, a closed-form expression of the ergodic capacity for amplify-and-forward opportunistic relaying in the presence of outdated channel state information (CSI) is still not available in the literature. That is mainly due to the mathematical intractability in the conventional performance analysis through manipulations of probability density function (PDF). In this paper, therefore, we take advantage of a novel mathematical approach based on moment generating function (MGF) to evaluate the performance. MGF of the end-to-end signalto-noise ratio for opportunistic relaying over independent and identically distributed Rayleigh channels with outdated CSI is given. Then, the closed-form expressions of ergodic capacity and outage probability are derived directly from MGF without any involvement of PDF. Finally, Monte-Carlo simulations are set up to corroborate the validity of the theoretical analysis.

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Effect of Feedback Delay on the Performance of Cooperative Networks with Relay Selection

Cited by 51 publications

References 24 publications

Noncoherent relay selection for bidirectional cooperative networks

Noncoherent relay selection for bidirectional cooperative networks

Cooperative Distributed Beamforming With Outdated CSI and Channel Estimation Errors

An MGF-Based Performance Analysis of Opportunistic Relay Selection with Outdated CSI

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