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SNR maximization while adhering to interference constraint towards primary users is a key challenge in Cognitive Radio Networks (CRNs). Cooperative communication is a promising technique to achieve this goal by exploiting spatial diversity. We consider an Amplify-and-Forward based cognitive relay network comprising one source-destination pair and multiple relays in underlay spectrum sharing environment...
This research investgates the physical layer aspect of power allocation in orthogonal frequency division multiplexing (OFDM) based indoor wireless optical communication (WOC) systems with intensity modulation and direct detection (IM/DD). The main objective is to reduce the average transmit optical power subject to a constraint on the bit error rate (BER). Based on the channel gain information, the...
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