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This paper considers the downlink of a cellular orthogonal frequency division multi-access (OFDMA) system, in which multiple base stations (BS) are coordinated by a centralized resource allocation algorithm. We address the problem of maximizing the weighted sum min-rate (WSMR) subject to a total power constraint at each BS, in terms of jointly optimizing coordinated BSs' subcarrier and power allocation...
In the heterogeneous networks, radio resource management (RRM) plays an important role to utilize the potential network diversity. In this paper, we study the RRM strategy in the heterogeneous networks involved with an orthogonal frequency division multiple access (OFDMA) network, with the aim of maximizing the minimum user throughput. An analytical model which reflects the feature of heterogeneous...
In this paper, we investigate the optimal spectrum management problem in multiuser frequency selective interference channels. First, a simple pairwise interference coupling condition under which FDMA can achieve all Pareto optimal points of the rate region is discovered. Not only is this condition sufficient, we show that it is also necessary for FDMA to be always optimal at least in symmetric channels...
This paper focuses on subchannel and power allocation problem in OFDMA-based decode-and-forward (DF) cooperative relay networks. The objective of this problem is to maximize the total data rate under the constraints of joint total transmission power and subchannels occupation, while maintaining the maximum fairness among multiple relay nodes. We transform this mixed integer programming problem to...
As wireless systems continue to proliferate, interference management is becoming a concern in both military and commercial domains. This paper introduces a novel cognitive coexistence framework between infrastructure and ad hoc networks. Based on sensing and predicting the ad-hoc networkpsilas activity, the infrastructure system allocates power and transmission time such as to minimize its impact...
This paper studies the downlink multiuser multiple input multiple output-orthogonal frequency division multiple access (MIMO-OFDMA) system for margin adaptive multiuser eigenmode transmission (MET) with perfect channel state information at the transmitter. In margin adaptive objective, base station (BS) has to satisfy individual quality of service (QoS) constraints of the users subject to transmit...
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