Amplify-and-Forward Relay Networks Under Received Power Constraint

Relay networks have received considerable attention recently, especially when limited size and power resources impose constraints on the number of antennas at each node. While fixed and mobile relays can cooperate to improve reception at the desired destination, they also contribute to unintended in...

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Bibliographic Details
Published in:IEEE transactions on wireless communications 2009-11, Vol.8 (11), p.5422-5426
Main Authors: Behbahani, A.S., Eltawil, A.M.
Format: Article
Language:English
Subjects:
Amplification
Analytical models
Antennas
Applied sciences
Audio frequencies
Communications technology
Cost function
Degradation
Digital relays
Exact sciences and technology
Frequency
Interference
Interference constraints
Minimum-mean-square-error (MMSE)
noise correlation
Optimization
Radiocommunications
Receiving antennas
Relay
Relay networks
relay optimization
Signal analysis
Signal to noise ratio
signal-to-noise ratio (SNR)
Telecommunications
Telecommunications and information theory
Wireless communication
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Summary:Relay networks have received considerable attention recently, especially when limited size and power resources impose constraints on the number of antennas at each node. While fixed and mobile relays can cooperate to improve reception at the desired destination, they also contribute to unintended interference for neighboring cells reusing the same frequency. In this paper, we propose and analyze a relay scheme to simultaneously maximize SNR and minimize MSE, for an amplify-and-forward (AF) relay network operating under a receive power constraint guaranteeing that the received signal power is bounded to control interference to neighboring cells. If the intended destination lies at the periphery of the cell, then the proposed scheme guarantees that the total power leaking into neighboring cells is bounded. The optimal relay factors are provided for both correlated and uncorrelated noise at the relays. Simulation results are presented to verify the analysis.
ISSN:1536-1276
1558-2248
DOI:10.1109/TWC.2009.081522