Dissertation > Excellent graduate degree dissertation topics show

Collaborative multi - point transmission key technology research

Author: LiQiang
Tutor: WuGang
School: University of Electronic Science and Technology
Course: Communication and Information System
Keywords: LTE Collaborative multi-point transmission Combined treatment Collaborative beamforming
CLC: TN919.3
Type: Master's thesis
Year: 2011
Downloads: 99
Quote: 0
Read: Download Dissertation

Abstract


MIMO (Multi-Input Multi-Output, MIMO) technology can effectively improve the system peak spectrum efficiency, have been set by the LTE (Long Term Evolution, LTE), the follow-up to the long-term evolution of the system (Long Term Evolution-Advanced, LTE -A) and the worldwide interoperability for microwave access (Worldwide Interoperability for Microwave Access, WiMax) system is adopted. In the LTE system cell edge spectrum efficiency due to the multi-cell co-channel interference is serious and not much improvement. To solve the problem of the bottleneck of the system capacity of the cell edge in the LTE system, the LTE-A system, a cooperative multi-point transmission technology (coordinated the Multi-Point Transmission, COMP). CoMP technology utilizes multi-cell co-processing can reduce multi-cell co-channel interference, and expand the scope of coverage and significantly improve the cell edge user throughput and system capacity. However, the the CoMP main problem is a compromise between the amount of feedback information and signaling overhead and processing latency and performance. CoMP system based on low-feedback precoding technology has become a hot research. The key technologies for collaborative multi-point transmission, first introduced the basic concepts, relevant background knowledge as well as pre-coding scheme, under the joint processing and detailed description of both cases for the uplink CoMP downlink CoMP and introduced himself research work. The first chapter gives an overview of the research background and current status of this work as well as some of the basic concepts and the main content of the framework is given in Fig. Second chapter for downlink CoMP system, detailed study of the four joint processing of the case of pre-coding scheme, namely: the global precoding, multicast single frequency network (Multicast Broadcast Single Frequency Network, the MBSFN) precoding, local precoding, weighted partial pre-encoding, and gives the preliminary results of computer simulation. Finally, detailed CoMP feedback mechanism. Chapter was first proposed in the uplink multi-user pairing technology into CoMP system. First introduces the basic concepts and background the uplink CoMP systems as well as multi-user pairing; then study the multi-user pairing scheme: random pairing orthogonal pairing determinant pairing, and proposed a new multi-user pairing algorithm The algorithm at the same time consider the system capacity as well as the user between the orthogonal nature; Finally, through computer simulation analysis and validation of the various options in the characteristics and performance space channel model (Spatial Channel Model, SCM) channel conditions, including when to be selected The number of users to 30, the proposed scheme can obtain capacity indicators of performance to enhance existing determinant pairing the algorithm 20bps/Hz enhance. The fourth chapter a the downlink CoMP system in the two types of processes: Joint processing and collaborative beamforming. For joint processing, mainly low-feedback-based zero forcing (Zero-forcing, ZF) precoding algorithms and low feedback of quantify merge letter leakage noise ratio (Signal-to-leakage-and-noise ration, SLNR under ) pre-coding algorithm, the proposed algorithm of the MIMO channel into a vector channel, further reducing the amount of feedback, and shows the simulation result related to authentication, when the base station transmit power to 46dBm, the proposed algorithm and traditional letter leakage noise than compared to the pre-coding algorithm, some 2.3bps/Hz enhance system capacity. For collaborative beamforming in a multi-cell based on the letter leakage noise ratio collaborative beamforming algorithm and derived expressions, and finally analyzed by computer simulation results show that the proposed scheme can reduce the amount of feedback overhead and system capacity. The performance loss is not serious. The last chapter of the thesis summarizes previous research and points out the future research directions.

Related Dissertations

  1. Study on Implementation Technology of Channel Estimation in OFDM System Based on DSP,TN919.3
  2. The Research on the Vertical Handoff Algorithms in Heterogeneous Wireless Networks,TN929.5
  3. Research on Error Controller of LTE Physical Layer,TN929.5
  4. The Anti-interference Research of Cell in LTE System,TN929.5
  5. The Research of Multi-user Scheduling of RRM for LTE,TN929.5
  6. Uplink Power Control of TD-LTE System,TN929.5
  7. Research on the Relay and M2M Random Access Technology of LTE-Advanced,TN929.5
  8. Research and Implementation of Downlink Simulation Platform Based on the LTE Protocol,TN929.5
  9. Research of Handoff Algorithm in High-speed Railway System,TN929.532
  10. The Research of Virtual Multiple-input Multiple-output for the Uplink of LTE System,TN929.5
  11. Research on the LTE Antenna Applied in 4G Communication,TN828.6
  12. A new dual- LTE-A and robustness of the design,TN929.5
  13. Multiple-input multiple-output (MIMO) antenna technology under study multiple base stations feedback,TN919.3
  14. LTE-WLAN switch interconnection protocol for heterogeneous systems,TN925.93
  15. FDD LTE base transceiver module RF performance testing and debugging,TN929.5
  16. RF front-end design of ultra-wideband transmitter,TN858
  17. Research and design of the FFT processor multiplier multiplexed multiplexer,TN919.3
  18. 2.6GHzTDD-LTE receiver design and implementation,TN851
  19. Research on Feedback Technology in LTE-A Downlink,TN929.5
  20. Research on Digital Predistortion Technique in LTE System,TN929.5
  21. Design of LTE Downlink Simulation Platform and Analysis of the Physical Layer Key Technology,TN929.5

CLC: > Industrial Technology > Radio electronics, telecommunications technology > Communicate > Data communication > Data transmission technology
© 2012 www.DissertationTopic.Net  Mobile