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In this paper, we formulate and solve a weighted-sum transmitter and receiverenergy minimization (WSTREMin) problem in the downlink of an orthogonalfrequency division multiplexing (OFDM) based multiuser wireless system. Theproposed approach offers the flexibility of assigning different levels ofimportance to base station (BS) and mobile terminal (MT) power consumption,corresponding to the BS being connected to the grid and the MT relying onbatteries. To obtain insights into the characteristics of the problem, we firstconsider two extreme cases separately, i.e., weighted-sum receiver-side energyminimization (WSREMin) for MTs and transmitter-side energy minimization (TEMin)for the BS. It is shown that Dynamic TDMA (D-TDMA), where MTs are scheduled forsingle-user OFDM transmissions over orthogonal time slots, is the optimaltransmission strategy for WSREMin at MTs, while OFDMA is optimal for TEMin atthe BS. As a hybrid of the two extreme cases, we further propose a new multipleaccess scheme, i.e., Time-Slotted OFDMA (TS-OFDMA) scheme, in which MTs aregrouped into orthogonal time slots with OFDMA applied to users assigned withinthe same slot. TS-OFDMA can be shown to include both D-TDMA and OFDMA asspecial cases. Numerical results confirm that the proposed schemes enable aflexible range of energy consumption tradeoffs between the BS and MTs.

Joint Transmitter and Receiver Energy Minimization in Multiuser OFDM Systems