Energy efficiency and spectral efficiency balance optimization algorithm in distributed antenna system

A distributed antenna, spectrum efficiency technology, applied in wireless communication, energy consumption reduction, advanced technology and other directions, can solve the problems of power waste, incomplete power model, and reduced system energy efficiency.

Active Publication Date: 2017-10-27
GUILIN UNIV OF ELECTRONIC TECH
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Problems solved by technology

[0004] 1) Some studies only consider the unilateral optimization of energy efficiency, and mainly study how to better allocate power, ignoring RAU selection; some studies combine the two well to further optimize the energy efficiency of the system without optimizing In terms of spectral efficiency, in the trend of increasingly pursuing high data transmission rates, spectral efficiency and energy efficiency are...

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  • Energy efficiency and spectral efficiency balance optimization algorithm in distributed antenna system
  • Energy efficiency and spectral efficiency balance optimization algorithm in distributed antenna system
  • Energy efficiency and spectral efficiency balance optimization algorithm in distributed antenna system

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Embodiment

[0083] An algorithm for optimizing the trade-off between energy and spectrum efficiency in a distributed antenna system, comprising the following steps:

[0084] Step 1: Establish a system model and determine the optimization goal:

[0085] Such as figure 1 As shown, in the cell, the base station is located in the center of the cell, and there are 1 RAUs uniformly distributed around the base station, which are denoted as RAU1, RAU2, ..., RAUI, and each RAU is connected to the base station through an optical fiber, and M users are randomly dispersed in the cell, denoted as For user 1, user 2,..., user M, the user and the RAU are equipped with an antenna, and the signal is received through the simple joint processing of the RAUs, and then forwarded to the central processing unit (Center Processing Unit, CPU for short) through the optical fiber, where the base station That is, the CPU can be regarded as a special RAU, which is denoted as RAU1. The RAUs distributed in the cell ca...

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Abstract

The invention discloses an energy efficiency and spectral efficiency balance optimization algorithm in a distributed antenna system. After carrying out remote access unit (RAU) selection in the condition of known user number and positions, system energy efficiency and spectral efficiency are optimized preliminarily. Then the Cobb-Douglas production function is introduced, the energy efficiency and spectral efficiency are considered at the same time, the Lagrange duality theory and the Kuhn-Tucker condition are applied to solve an approximate solution, finally a subgradient iteration algorithm is applied, a Lagrange multiplier and the transmission power approximation value of each RAU are updated in each time of iteration until the convergence of a transmission power value and the Lagrange multiplier, and power distribution at that time is an approximation value of a global optimal solution of the optimization of energy and spectral efficiency at the same time. Through taking different preference factors, the energy and spectral efficiency can be flexibly balanced, and an effect of optimizing the energy efficiency and spectral efficiency at the same time is achieved.

Description

technical field [0001] The invention belongs to the field of wireless communication, in particular to the trade-off optimization of energy efficiency and spectrum efficiency, in particular to an algorithm for trade-off optimization of energy efficiency and spectrum efficiency in a distributed antenna system. Background technique [0002] At present, distributed antenna systems, large-scale multiple input multiple output (MIMO), cloud radio access networks (CRANs) and heterogeneous networks (Heterogeneous Network, HETS) are considered to meet the requirements of 5G cellular networks. technology. Different from the traditional centralized antenna system (Centralized AntennaSystems, referred to as CAS), the distributed antenna system (Distributed Antenna System, referred to as DAS) has one or more remote access units (Remote Access Unit, referred to as RAU) antenna distributed in In different locations of the cell, each RAU is connected to the central processing unit (CENTER P...

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Application Information

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IPC IPC(8): H04W16/14H04W36/00
CPCH04W16/14H04W36/0077H04W36/0088Y02D30/70
Inventor 王吉平邓世燕陈宏滨
Owner GUILIN UNIV OF ELECTRONIC TECH
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