Research On The Antenna Selection For Distributed Wireless Networks

In recent years, some literatures show that the wireless communication networks based on distributed antenna technology has the advantages in network coverage, frequency utilization and power control. In this dissertation, antenna selection which is one of the most important technology for distributed wireless networks is investigated.In this dissertation, two theses are studied on the channel capacity of distributed MIMO system and the remote antenna units(RAU) selection for distributed antenna system. Firstly, we studied the channel capacity of distributed MIMO system where the channel model considered the influences of path loss, fast fading and lognormal shadowing. MIMO channel capacity between distributed antenna (DA) systems and conventional centralized antenna (CA) systems were compared. Through the comparison, it was found that the DA systems could acquire equal coverage property in the cell, and achieve a better channel capacity than CA systems. Secondly, we investigated the RAU dynamic selection criteria for distributed antenna system. A selection model is studied for RAU selection in distributed system based on soft handoff theories. The selection strategy is based on received signal strength (RSS) measurements and described as a multiple state Markov chain. The RSS threshold is determined by velocity of MS. This model can be used in the tranceive controlling and GN-Cell handover for distributed antenna system.This dissertation is based on many literatures about the distributed antenna technology. We studied the channel capacity and antenna selection for distributed antenna system. With the help of computer simulation, we attained many new conclusions.