Journal
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
Volume 67, Issue 8, Pages 7407-7418Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TVT.2018.2837112
Keywords
Large-scale MIMO; OFDM; perturbation-assisted PAPR reduction; ADMM
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Funding
- National Science Foundation of China [61522104]
- Foundation of the Science and Technology on Communication Networks Laboratory
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We consider the problem of peak-to-average power ratio (PAPR) reduction for orthogonal frequency-division multiplexing based large-scale multiple-input multiple-output systems. A novel perturbation-assisted scheme is developed to reduce the PAPRs of the transmitted signals by exploiting the redundant degrees-of-freedom inherent in the large-scale antenna array. Specifically, we introduce carefully devised perturbation signals to the frequency-domain precoded signals, with the aim of reducing the PAPRs of their time-domain counterpart signals. Meanwhile, the additive perturbation signal associated with each tone is constrained to lie in the null-space of its associated channel matrix, such that it does not cause any multiuser interference and out-of-band radiations. Such a problem is formulated as convex optimization problems, and two efficient algorithms, referred to as PROXINF-ADMM1 and PROXINF-ADMM2, are developed by resorting to the variable splitting and alterative direction method of multipliers techniques. Simulation results show that the proposed method has a fast convergence rate and achieves substantial PAPR reduction within only tens of iterations.
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