Research On Coordinated Multi-Point Transmission In Lte-Advanced System

This paper focuses on the research of coordinated multi-point transmission (CoMP) technology in LTE-Advanced system. According to its collaborative approach, CoMP can be further subdivided into Joint Processing (JP) and Coordinated scheduling/Coordinated beamforming (CS/CB), this paper analyzes the application scenarios of these two collaborative approach. And with an emphasis on research and simulation under the joint processing (JP) conditions, this paper studied the impact of different collaborative clusters selection strategies (collaboration within the base stations, collaboration between base stations) and different planning strategies (dynamic planning, static planning).Scheduling is the key of resource allocation in CoMP system, this paper analyzes Round Robin, Max C/I, Proportional Fair scheduling algorithms, and highlights a new channel-correlation-based multi-user scheduling algorithm. Simulation results show that in the case of joint scheduling in coordinated clusters, this algorithm can give more than25%performance gain to the edge users in CoMP system.Beamforming is another key for CoMP-JP, this paper describes some traditional beamforming algorithms, such as zero-forcing, block diagonalization, BD-SVD, MET, and use the idea of equivalent channel in MET to present a novel zero forcing algorithm.In the end, this paper studied the impact of some real world imperfect such as antenna calibration error, frequency offset between base stations and SRS channel estimation errors, simulation results showed that compared to the first two error, SRS channel estimation errors can cause more loss. But even suffered with these non-ideal factors, CoMP can still show significant performance advantages.