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Random Access Game in Fading Channels With Capture: Equilibria and Braess-like Paradoxes

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2 Author(s)
Fu-Te Hsu ; Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei, Taiwan ; Hsuan-Jung Su

The Nash equilibrium point of the transmission probabilities in a slotted ALOHA system with selfish nodes is analyzed. The system consists of a finite number of heterogeneous nodes, each trying to minimize its average transmission probability (or power investment) selfishly while meeting its average throughput demand over the shared wireless channel to a common base station (BS). We use a game-theoretic approach to analyze the network under two reception models: one is called power capture, the other is called signal-to-interference-plus-noise ratio (SINR) capture. It is shown that, in some situations, Braess-like paradoxes may occur. That is, the performance of the system may become worse instead of better when channel state information (CSI) is available at the selfish nodes. In particular, for homogeneous nodes, we analytically presented that Braess-like paradoxes occur in the power capture model, and in the SINR capture model with the capture ratio larger than one and the noise to signal ratio sufficiently small.

Published in:

Signal Processing, IEEE Transactions on  (Volume:59 ,  Issue: 3 )

Date of Publication:

March 2011

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