High energy efficiency adaptive hybrid precoding scheme based on delay line combined phase modulation
Aiming at the high-power consumption impact of millimeter-wave large-scale multiple-input-multiple-output systems using hybrid precoding techniques,an indirect fully-connected hybrid precoding system architecture is designed based on de-lay line combined phase modulator devices,and an adaptive connected hybrid precoding scheme is proposed,which can sig-nificantly reduce the phase modulators directly connected to the antenna and thus reduce the power loss caused by the hard-ware.The scheme divides the solution of the coding matrix into three parts for alternating optimization:the digital coding ma-trix,the analog coding matrix,and the connection exchange matrix composed of switches.An algorithm based on complemen-tary orthogonal projection matrix is proposed to solve the optimization of the analog coding matrix;the power constraints and least squares algorithm are utilized to simplify the solution of the digital coding matrix;and the low-complexity cross-entropy algorithm is utilized for the optimization of discrete combinations of connected exchange matrices.Simulation results show that the proposed scheme can ensure system performance close to pure digital precoding scheme while effectively improving system energy efficiency.
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维普
