For the insufficient energy efficiency(EE) in mmWave massive MIMO(Multiple-Input Multiple-Output) systems
a method with mixed-resolution phase shifters is proposed. Considering that the closed expression for EE is difficult to solve directly
the EE optimization problem is converted into norm minimization form through the Dinkelbach method. Then it is further decoupled into the hybrid precoding matrix and the mixed-resolution ratio problems to realize the convex optimization transformation of non-convex EE and low norm sum. Finally
in order to maximize the EE of the system
the unitary matrix relaxation constant modulus constraint is introduced to solve the full-resolution hybrid precoding matrix
and the incremental search algorithm is used to solve the optimal mixed-resolution ratio vector. The simulation results show that the spectrum efficiency performance of the proposed mixed-resolution algorithm is better than that of the traditional finite-resolution algorithm
and it has higher EE performance. Meanwhile
the system performance of the proposed mixed-resolution quantization structure is close to the full-digital structure when multiple data streams are transmitted.
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references
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