Research Of The Antenna Selection And Position Of Distributed Antenna System

The two most important of LTE technology are orthogonal frequency division multiplexing(OFDM) and multiple-input multiple-output(MIMO) antenna technology. MIMO studies on centralized have had quite a lot, the antennas of traditional MIMO technology are centrally located. Distribution Antenna although also a generalized MIMO system, but the multiple antennas are located at different locations in the district, and therefore presents many and centralized MIMO many different characteristics. Optical fiber connectes distributed antenna system antenna and the central processor together, the antenna is only responsible for sending signals, the central processor controls the configuration of the entire system. Such a distributed antenna system can narrow the distance between the mobile terminal and base station antennas to improve coverage system, increase energy and spectral efficiency of the system.Since the proposed distributed antenna system has been widely studied scholars distributed antenna system in the antenna selection, power distribution and put forward a number of algorithms, but there are still many problems in the realization of specific projects, This paper mainly work in the following areas:1, Summarizes the research stage distributed antenna system, will stage algorithm is divided into antenna selection algorithms and power allocation algorithm. Introduced antenna selection and power allocation algorithm in the optimal solution, as well as on best Solutions to simplify the calculation of the optimal solution proposed algorithm published at this stage.2, Improve the disadvantages of single antenna selection, antenna selection single stage forced to select only one antenna, simplifying the algorithm steps, while the loss of the user’s performance in the center of the antenna, this paper presents a single antenna selection and more in Antenna Select bound program.3, Summarizes the conventional multi-antenna selection algorithm, the proposed based on multi-antenna selection scheme, the channel capacity while safeguarding system to improve the energy efficiency of the system, simulation of the program system channel capacity and energy efficiency.4, Distributed Antenna System to locate and solve the LTE base station location when synchronization between base stations of the time difference, to improve the positioning accuracy.