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In this paper, we analyze the advantages of multi-access (MA) systems in heterogeneous networks, where a mobile station (MS) can simultaneously access different non-interfering networks with different radio access technologies (RATs). For this analysis, we consider the following problem: How many RATs should the MS connect to? First, the beneficial aspects of MA is demonstrated by a simplified example,...
Beyond third generation (B3G) mobile communication systems may allow users to simultaneously launch multiple multimedia applications with very diverse quality of service (QoS) requirements. In order to achieve resource efficiency, if two applications of the same user have different bit-error-rate (BER) constraints, depending on the multi-user mutiple access technology, the symbols of these two applications...
This paper considers a sum-rate-maximizing power allocation for the Gaussian cognitive multiple-access channel (MAC), where primary users and secondary users may communicate under mutual interference. Formulation of the problem as a standard nonconvex quadratically constrained quadratic problem (QCQP) provides a simple method to find a solution using semidefinite relaxation (SDR). Numerical examples...
Beyond third generation (3 G) mobile communication systems are expected to support various multimedia services. A mobile user, under the constraint of his/her maximum transmission rate and power may launch multiple services simultaneously. In the uplink, the mobile station (MS) will need to allocate its limited resources (processing and transmit power, rate) among the user's different services, based...
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