Resource allocation for downlink two-user OFDMA systems with wireless network coding

We first address a sum-rate maximization problem under a sum-power constraint. By introducing the concept of virtual user, we solve the problem by using the Lagrange dual method. We then look into a sum-power minimization problem under sum-rate constraints. The Lagrange dual method and an exhaustive...

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Bibliographic Details
Main Authors: Tarasak, P., Sumei Sun
Format: Conference Proceeding
Language:English
Subjects:
Encoding
Minimization
Network coding
Resource management
Search methods
Signal to noise ratio
Wireless networks
Online Access:Request full text
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Summary:We first address a sum-rate maximization problem under a sum-power constraint. By introducing the concept of virtual user, we solve the problem by using the Lagrange dual method. We then look into a sum-power minimization problem under sum-rate constraints. The Lagrange dual method and an exhaustive search method are proposed, which achieve similar performance, but the former has a lower complexity. Our simulation shows about 3-dB power saving of our scheme over an OFDMA system without network coding.
ISSN:1948-3244
1948-3252
DOI:10.1109/SPAWC.2011.5990408