L1 Minimization Based Par Reduction in MU-MIMO-OFDM
|G.Ranga Reddy1, Prof.C.Chandrasekhar2
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The use of OFDM causes a high peak to- average (power) ratio (PAR), which necessitate expensive and power- inefficient radio-frequency (RF) components at the base station. In this article we present a novel downlink transmission scheme, which exploits the massive degrees-of-freedom available in large-scale MU-MIMO-OFDM systems to achieve low PAR. Specifically, we suggest to jointly perform MU pre coding, modulation, and PAR reduction by solving a convex optimization predicament. We develop a corresponding fast iterative truncation algorithm (FITRA) with l1 minimization and show numerical results to demonstrate tremendous PAR-reduction capability The significantly reduced linearity requirements ultimately enable the use of low-cost RF components for the large-scale MU-MIMO-OFDM downlink.