Realizing Fully Digital Precoders in Hybrid A/D Architecture With Minimum Number of RF Chains

In this letter, the minimum number of required radio frequency (RF) chains for realizing any MIMO fully digital precoder (FDP) with the hybrid analog/digital precoder (HADP) architecture is investigated from a new perspective. First, in order to take full advantage of the digital domain, an extended system formulation of the hybrid structure is presented in… CONTINUE READING