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With the advent of new applications, one of the primary applications supported in downlink cellular systems is streaming video. QoS for streaming video entails data transmission to the mobile stations with limited latency and limited jitter. This requirement on latency and jitter can be mapped to the number of yet-to-be-played packets in a mobile station's buffer, to always be above a certain minimum...
This paper reformulates the multi-user OFDMA resource allocation problems in broadcast and multiple-access channels by defining an equivalent interference channel. The resulting problems are then solved by employing low-complexity algorithms for spectrum optimization in the interference channel. The re-formulation averts the high-complexity integer programming problem that otherwise results from an...
This paper develops the optimal power-allocation algorithm to maximize the sum-rate in orthogonal frequency-division multiple-access (OFDMA) regenerative relaying downlink systems with separate power constraints. The optimal algorithm is based on the Lagrange dual-decomposition method when subchannels are pre-assigned to users and relay stations (RS). This paper also proposes a heuristic algorithm,...
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