- Journal Article
Rights / licenseIn Copyright - Non-Commercial Use Permitted
We investigate an orthogonal frequency-division multiplexing (OFDM)-based downlink transmission scheme for large-scale multi-user (MU) multiple-input multiple-output (MIMO) wireless systems. The use of OFDM causes a high peak-to-average (power) ratio (PAR), which necessitates expensive and power-inefficient radio-frequency (RF) components at the base station. In this paper, 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 propose to jointly perform MU precoding, OFDM modulation, and PAR reduction by solving a convex optimization problem. We develop a corresponding fast iterative truncation algorithm (FITRA) and show numerical results to demonstrate tremendous PAR-reduction capabilities. The significantly reduced linearity requirements eventually enable the use of low-cost RF components for the large-scale MU-MIMO-OFDM downlink. Show more
Journal / seriesIEEE Journal on Selected Areas in Communications
Pages / Article No.
SubjectConvex optimization; Multi-user wireless communication; Multiple-input multiple-output (MIMO); Orthogonal frequency-division multiplexing (OFDM); Peak-to-average (power) ratio (PAR) reduction; Precoding
Organisational unit09695 - Studer, Christoph / Studer, Christoph
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