Wideband Hybrid Precoding using Time Modulated Arrays
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Date
2020
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Publisher
IEEE
Abstract
Hybrid digital-analog precoding is a cost effective solution for transmitting over the large bandwidths
and huge antenna arrays available in the millimeter wave frequency bands. In this work we focus on the
transmission of wideband signals over hybrid precoders that utilize Time-Modulated Arrays in the analog
domain. We consider analog precoders constructed with Single-Pole-Double-Throw switches which are both
flexible and efficient. We pose two Orthogonal Frequency-Division Multiplexing symbol configurations
to cope with the harmonic interference introduced by the Time-Modulated Array. One does not take
advantage of the wireless channel frequency diversity and the other does. We optimize digital and analog
precoders to maximize the achievable rate in both symbol configurations. Optimization takes into account
the switching devices efficiency and the inherent losses of this antenna technique. Finally, we show the
excellent performance obtained with the proposed approach, in terms of achievable rate, compared to that
of conventional phased arrays.