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In the multi-user multiple-input multiple-output (MIMO) system, orthogonal random beamforming (ORBF) scheme is proposed to serve multiple users simultaneously in order to achieve the multi-user diversity gain. The opportunistic space-division multiple access system (OSDMA-S) scheme performs multiple weighting matrices during the training phase and chooses the best weighting matrix to be used to broadcast...
In this paper, we propose a distributed precoder design algorithm for suppressing the inter-cell interference(ICI) and maximizing the average throughput of a multi-cell multi-user multi-input multi-output(MU-MIMO) system. Motivated by the recent results of the distributed signal-to-leakage-plus-noise ratio(SLNR) model for ICI coordination(ICIC), we design a joint optimization algorithm to achieve...
We consider dynamic spectrum access among cognitive radio from an adaptive learning perspective. In order to avoid the costly channel switching and to ensure QoS satisfaction of nodes, a secondary user may desire an optimal channel which maximizes the throughput, rather than consistently adapting channels to the random environment. We propose a stochastic spectrum access based on learning automata...
Cooperative OFDM transmission is an efficient solution to combat wireless channel fading and to increase system throughput in future board communication. In this paper, we consider the uplink scenario of a cellular cooperative OFDM network, in which multi-relays can forward the source's message to base station. The uplink throughput is optimized by using decode-and-forward (DF) opportunistic relaying...
Typical wireless mesh networks (WMNs) represent a hybrid solution between infrastructure networks and ad-hoc meshing, and are often regarded as a low-cost alternative technology for last-mile broadband Internet access. In the WMNs each node potentially acts as a relay, forwarding traffic generated by other nodes. However, the theoretical framework that determines the performance of WMN is still illegible...
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