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The energy efficiency (EE) maximization problem in amplify-and-forward (AF) relay-assisted downlink channels with orthogonal frequency-division multiple access (OFDMA) is studied. The power allocation is optimized together with subcarrier allocation and pairing at the relay. As the base station and the relay have individual power constraints, an alternating optimization approach is adopted to solve...
This paper investigates the optimal design of multiple-input-multiple-output (MIMO) precoders for orthogonal frequency-division multiplexing (OFDM) systems in the presence of nonlinear distortions due to the high power amplifier (HPA). In traditional approaches, the designer lets the input backoff (IBO) of the HPA be large enough to neglect the unavoidable nonlinear effects of the amplifier. However,...
In this paper, a low coherence compressed channel estimation method is proposed for high mobility MIMO OFDM systems. High mobility always causes large Doppler frequency spread which costs large spectrum and time resources to obtain the accurate channel state information (CSI). As numerous recent experimental studies have shown that high mobility broadband wireless channels tend to have some inherent...
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