Amplify-and-Forward Relay Networks Under Received Power Constraint

Behbahani, Alireza S.; Eltawil, Ahmed M.

doi:10.1109/twc.2009.081522

Cited by 35 publications

(41 citation statements)

References 8 publications

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“…The optimal AF scheme was obtained in closed form under a sum relay power constraint. Later, in [14], the optimal AF scheme was proposed for the same network model under a receive power constraint where relays were also exposed to correlated noise. To develop optimal AF schemes under different constraints, noise covariance and instantaneous channel coefficients are required.…”

Section: Introductionmentioning

confidence: 99%

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Optimal Amplify-and-Forward Scheme for Parallel Relay Networks with Correlated Relay Noise

Liu

Yang

2014

ETRI J

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This paper studies a parallel relay network where the relays employ an amplify-and-forward (AF) relaying scheme and are subjected to individual power constraints. We consider correlated effective relay noise arising from practical scenarios when the relays are exposed to common interferers. Assuming that the noise covariance and the full channel state information are available, we investigate the problem of finding the optimal AF scheme in terms of maximum end-to-end transmission rate. It is shown that the maximization problem can be equivalently transformed to a convex semi-definite program, which can be efficiently solved. Then an upper bound on the maximum achievable AF rate of this network is provided to further evaluate the performance of the optimal AF scheme. It is proved that the upper bound can be asymptotically achieved in two special regimes when the transmit power of the source node or the relays is sufficiently large. Finally, both theoretical and numerical results are given to show that, on average, noise correlation is beneficial to the transmission ratewhether the relays know the noise covariance matrix or not.

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Section: Introductionmentioning

confidence: 99%

“…Different from the existing works [13] and [14], the optimal AF scheme is developed under individual relay power constraints. The constraint is a more practical one, which makes the problem more challenging.…”

Section: Introductionmentioning

confidence: 99%

Optimal Amplify-and-Forward Scheme for Parallel Relay Networks with Correlated Relay Noise

Liu

Yang

2014

ETRI J

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“…In addition, efficient amplifying relay matrices using different objective functions and power constraints have been sou- ght for a single-input-single-output AF network [6]- [8]. In [6], the authors presented the AF relay strategy under the received signal power constraint at the destination node for a onesource-one-destination pair and -relay node network.…”

Section: Introductionmentioning

confidence: 99%

“…Behbahani and Eltawil in [7] minimized the mean square error cost under the power constraint at an equalizer input. Recently, the authors in [8] derived an optimal relay factor for the one-source-one-destination pair and -relay node network to minimize MSE under the power constraint at the destination node. However, Behbahani et al in [7] and Behbahani and Eltawil in [8] employed the proportionality to solve the optimization problem as shown in (17) of [7] and in (15) of [8], respectively.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, the authors in [8] derived an optimal relay factor for the one-source-one-destination pair and -relay node network to minimize MSE under the power constraint at the destination node. However, Behbahani et al in [7] and Behbahani and Eltawil in [8] employed the proportionality to solve the optimization problem as shown in (17) of [7] and in (15) of [8], respectively. However, in [9], [10], noncooperative distributed minimum mean square error (MMSE)-based AF relay schemes in wireless networks under the received power constraint at the destination node for single-input single-output with relay nodes was studied by the authors of this paper.…”

Section: Introductionmentioning

confidence: 99%

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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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Iterative receiver for amplify‐and‐forward relay networks with unknown noise correlation

Zhang

Tang²,

Ren

2012

Wireless Communications

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For amplify-and-forward relay networks, we propose an iterative scheme to estimate channel and detect information symbols for the multi-antenna destination in spatially correlated noise. The equivalent channel coefficients and noise covariance are estimated by expectation-maximization algorithm. In addition, we discuss the initialization of iteration and analyze the modified Cramér-Rao bound to show the performance of the proposed iterative estimation. Moreover, on the basis of the structure of the proposed iterative estimator, a joint channel estimation and detection receiver is also provided. Finally, simulation results show that the proposed channel estimator and receiver can achieve the optimal performances in amplify-and-forward relay networks with unknown noise correlation.

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Amplify-and-Forward Relay Networks Under Received Power Constraint

Cited by 35 publications

References 8 publications

Optimal Amplify-and-Forward Scheme for Parallel Relay Networks with Correlated Relay Noise

Optimal Amplify-and-Forward Scheme for Parallel Relay Networks with Correlated Relay Noise

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

Iterative receiver for amplify‐and‐forward relay networks with unknown noise correlation

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