Collaboration With Multi-point Transmission System Capacity Simulation Study

IMT Advanced is the future evolution, it with various mobile communications standards goals, and now the evolution of mobile wireless technology, there are three main paths: WCDMA and TD-SCDMA, from HSPA to HSPA+, to the LTE / LTE Advanced; CDMA2000 along the lxEV-DORev. 0, 1 xEV-DORev.A, ixEV-DORev.B, to UMB / UMB Adanced or LTE / LTE Advancd; 802.16e evolution to 802.16m.IMT Advanced will be the ultimate goal,it is to achieve high-capacity, high data rate, low cost per bit transmitted, a wide range of enhanced coverage, and high spectral efficiency, lower propagation delay, flexible spectrum use and application of programs to support enhanced network load ( such as full-motion video), and effective support ranging from the load cell and so on.CoMP(Coordinated Multiple Point) is built around the goal of IMT Advanced,it made through the base station in different radio access points (RRU) collaboration, base stations and base stations in their respective Relay coordination and collaboration among a variety of multi - Point collaborative approach, reducing the cell edge interference and improve the cell edge spectral efficiency, to increase effective coverage of technical measures. Single-site multi-antenna technology, or non-CoMP class technology can increase the data transfer rate, but it does not significantly improve cell edge performance, but a lot of work mode multi-antenna technology, such as multiplexing, Beamforming universality is not very good; and through multi-point collaboration, can constitute a virtual MIMO (VMIMO), increase the cell edge performance, is not very high-end requirements.The full name of BD also known as channel block diagonalization algorithm is pre-coding algorithm CoMP more important in a technology, but also the focus of this project research. Block Diagonalization (BD) algorithm is for each multi-antenna receiver is the case of another sub-optimal solution. Channel Block Diagonalization using SVD deCoMPosition of the pre-coding techniques to find other user MIMO channel, the zero space vector (Null Space) as the user's pre-coding vector, can CoMPletely eliminate CCI. Since the null space vector is generated by unitary vector, so the channel block diagonalization precoding technology can CoMPletely eliminate multi-user interference and to produce a certain pre-coding gain at the same time requires less transmit power, in terms of performance than the channel inversion Pre-coding technology greatly enhanced.