Distributed multi-cell large-scale MIMO power distribution method for energy efficiency and spectrum efficiency joint optimization

Abstract

The invention discloses a distributed multi-cell large-scale MIMO (Multiple Input Multiple Output) power distribution method for joint optimization of energy efficiency and spectrum efficiency, which comprises the following steps of: constructing a cell cluster, configuring an antenna array, and generating a beam set through beam forming; acquiring statistical channel state information of each user in the cell cluster; power distribution is carried out among the base stations through distributed cooperation by using a deterministic equivalent method, an MM method and an iterative water injection algorithm; the optimization target of the power distribution optimization problem is the minimum value of the weighted sum of the energy efficiency and the spectrum efficiency of each cell; and dynamically implementing multi-cell large-scale MIMO beam domain power allocation according to the change of the statistical channel state information. On the basis of a multi-cell distributed scene, limited information interaction is carried out between the base stations, the backhaul overhead is small, the beam domain of the user is fully utilized to count the channel state information, the energy efficiency and the spectrum efficiency of the system can be effectively improved, the balance of the energy efficiency and the spectrum efficiency can be realized, and the complexity of optimization problem solving and physical layer implementation is remarkably reduced.

Description

technical field [0001] The present invention relates to the technical field of multi-cell massive MIMO power allocation, in particular to a distributed multi-cell massive MIMO power allocation method with joint optimization of energy efficiency and spectrum efficiency. Background technique [0002] In a massive MIMO system, a massive antenna array is arranged at the base station to serve multiple users simultaneously. The use of massive MIMO technology can effectively reduce the interference between users and greatly improve the energy efficiency and spectral efficiency of wireless communication systems. Beam domain transmission means that the base station side converts the transmitted signal to the beam domain through a unified unitary transformation, making full use of the spatial angular resolution of the large-scale antenna array and the local characteristics of the user channel in the beam domain. [0003] In the multi-cell massive MIMO downlink transmission process, t...

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Problems solved by technology

Traditional optimization problems are often based on instantaneous channel state information, but in massive MIMO systems, it is difficult to obtain instantaneous channel state information, and when the number of antennas on the base station side is large, the complexity of the expected process in solving the user rate is very high. high

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