Key Techniques Of Joint Processing In Coordinated Multi-Point Transmission

Current wireless communications are developing towards higher data rates and wider bandwidth. As one of the typical representations, 3GPP is promoting 4G's standardization actively. Moreover, coordinated multi-point transmission (CoMP) is adopted as one of the most important key techniques of IMT-Advanced for its potential in improving the cell-edge throughput and cell coverage. In addition,3GPP will focus on standardization work of CoMP in LTE-Advanced Realease 11 of 2011. On the basis of great development of current communications and the backup of libratoty's projects, the thesis focuses on the research of CoMP technique, including joint processing schemes, uplink data combination techniques and capacity in CoMP scenarios.Firstly, the paper proposes three beamforming-based joint processing schemes in downlink CoMP scenarios from the standardization aspect. Via simulations based on LTE link platform, it is proved that the propsed three schemes improve cell-edge user's quality effectively.Next, a novel data combination scheme is proposed in uplink CoMP scenarios, which is proved to reduce X2 interface overhead effectively.Finally, the thesis works at CoMP capacity on the basis of each base station individual peak-power constraint with the tool of convex and matrix theories. Moreover, an explicit capacity expression is deduced in a special CoMP scenario where two base stations cooperate to serve the user. In the subsequent theory research, the paper promotes the application scenarios of the above capacity analysis result. Finally, an optimal global precoding and power allocation method is proposed to maximize the instantaneous transmit rate of the two cooperated base station scenarios.