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The relay selection problem in a large wireless sensor network (WSN) with uniformly distributed identical nodes is investigated for a two-phase cooperative protocol where the signal transmitted from a single source is overheard by the network and is then relayed by multiple selected nodes subject to a total average transmission power. First, a relay selection technique is considered that maximizes...
In this paper, we address a sub-optimum distributed power allocation (SODPA) scheme for two-hop parallel relay networks, which includes a source-destination pair and multiple relay nodes. The system employs Decode-and-Forward (DF) as relaying protocol. In the proposed scheme, each relay is assumed to be able to decode the received signal if it satisfies the given SNR threshold and may make decision...
In this paper, we propose a hybrid relay selection (HRS) scheme in a general cooperative network using differential modulation. In the HRS scheme, when the destination decodes successfully, the relay nodes will remain silent. Otherwise, optimal relay node has to be determined to make an additional transmission. In this process, all the relays are divided into two groups, referred to as an amplify-and-forward...
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