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Relay-aided opportunistic scheduling in wireless networks

Relay-aided opportunistic scheduling in wireless networks

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© The Institution of Engineering and Technology
Published

One of the most promising approaches to boost the communication efficiency in wireless systems is the use of multiuser diversity (MUDiv), where the fading of channels is exploited. The mechanism of scheduling the user with the best channel condition is called opportunistic scheduling (OS). In this paper, we propose a novel OS algorithm in wireless networks that reduces the feedback load with the aid of relaying. It is called relay-aided opportunistic scheduling (RAOS). We consider two schemes: non-greedy RAOS and greedy RAOS. In the non-greedy RAOS schemes, we consider two scenario: non-persistent and p-persistent, where the persisting occurs when no feedback is received via a relay. The RAOS algorithm requires users to feedback their signal-to-noise ratios (SNRs) either directly to the access point (AP) or via a relay. Furthermore, We analyse the RAOS algorithm under slow Rayleigh fading assumption and derive the closed-form expressions for the feedback load as well as the spectral efficiency. The result shows that the RAOS algorithm provides 55% feedback load reduction compared with other scheduling algorithms.

Inspec keywords: Rayleigh channels; radio networks

Other keywords: wireless networks; multiuser diversity; fading channels; signal-to-noise ratios; Rayleigh fading; relay-aided opportunistic scheduling; opportunistic scheduling; access point

Subjects: Radio links and equipment

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