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This paper defines a new metric: a relay gain that measures the performance gain of users using relaying channels at distance s from a base station. The paper derives the closed form of the relay gain for urban macro-cells and rural areas, and shows that the closed form provides much information about how to maximize the performance gain of relay systems. Further, this paper investigates the fairness...
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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