Group Cell Architecture Verification Platform And Field Trial Network Construction And Antenna Selection Algorithm Research

Currently, the third generation (3G) mobile communication networks, which have been widely operated commercially all over the world, bring high-speed mobile Internet experience to people. Smart phones, tablet computers and other mobile terminal equipments are becoming increasingly popular. The demand for mobile communication is still growing constantly. Taking into account the future development and subsequent evolution of the IMT-2000(3G criterion), the International Telecommunication Union (ITU) proposed IMT-Advanced system (4G criterion) in2008, which raised on a number of performance indicators beyond IMT-2000. New physical layer technologies like MIMO-OFDM can effectively improve the spectrum efficiency and can solve the above problem. But the performance enhancement by these technologies is often limited by inter-cell interference. Moreover, the spectrum resources are strain currently, so the future mobile communication system is bound to use higher carrier frequency, which will result in reduced cell coverage and deteriorated cell edge performance. Group Cell architecture theory based on the distributed antennas and MIMO can provide higher system capacity and larger coverage. Slide handover strategy for Group Cell can make users always in the cell center, eliminating cell edge effect. Group Cell architecture provides more flexible access network and flat network architecture, and these advantages are in line with the needs of IMT-Advanced system. The project "IMT-Advanced open key technologies research (under Group Cell architecture)" is an important subproject of the National Science and Technology Major Project "next-generation broadband wireless mobile communication network". The task of this project is to investigate the key technologies for IMT-Advanced systems under Group Cell architecture, and to propose technical solutions and applications. To verify these technologies, a set of test system and field trial network must be built, including three access points (AP), two mobile terminals (MT), remote antenna units via optical fiber and IP networks. OFDM and MIMO are used in the physical layer, and MAC layer has the functions of QoS guarantee and radio resource management and scheduling. I tested the physical layer algorithm, the MAC layer function and the system performance, and analyzed the test results. This thesis describes the OFDM PAPR (Peak to Average Power Ratio) suppression algorithm test.The wireless channel environment was tested around Beijing University of Posts and Telecommunications. A field trial network was designed and built. Radio resource management and scheduling were tested in the trial network. This thesis introduces the power allocation test on antenna units. Slide handover performance was tested by HD video stream service.Antenna selection for distributed MIMO system under Group Cell architecture is researched in this thesis, which is a basis of slide handover. Based on Markov chain Monte Carlo (MCMC) method, an antenna selection algorithm for uplink receiving antenna selection is proposed. The basic idea of MCMC method is to construct a suitable Markov chain whose stationary distribution is just the target distribution. The MCMC method is used for sampling and can also be used for stochastic optimization to reduce the computational complexity. In this thesis, based on MCMC, an antenna selection algorithm for distributed MIMO system is proposed and the simulation results show its performance is very close to the optimal.