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Hybrid digital/analog precoding has been widely utilized in millimeter-wave (mmWave) multiple-input multiple-output (MIMO) systems. Compared to the digital precoder, it is more challenging to design the analog precoder because of the constant amplitude (CA) constraints on the entries. Although high-resolution analog phase shifters (APSs) can provide more choices in phase adjustment, it also adds the...
In this letter, we study the feasibility of interference neutralization (IN) for a two-user interference channel (IC) with a multi-input-multi-output (MIMO) instantaneous relay. With this channel model, Lee et al. show that instantaneous relaying is a promising approach to neutralize interference and increase the degrees of freedom (DoF). However, only the scenario where each node has the same number...
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