Dissertation > Excellent graduate degree dissertation topics show

OFDM system carrier aggregation technology

Author: LiuChaoSheng
Tutor: ZhangZhongPei
School: University of Electronic Science and Technology
Course: Communication and Information System
Keywords: OFDM Carrier Aggregation multi-carrier aggregation direct wideband aggregation guard band
CLC: TN919.3
Type: Master's thesis
Year: 2010
Downloads: 262
Quote: 7
Read: Download Dissertation

Abstract


The mobile communication development has created an increasing demand for high data rate and large band. Although the transmission rate is greatly improved by the 3G application, some services, such as the Multimedia and Internet, require a higher transmission speed. In order to achieve this aim, it is needed not only to heighten spectrum efficiency but also to expand bandwidth in the limited frequency resources.The carrier aggregation is regarded as the key technology for bandwidth expansion when the quasi-4G system that LTE and IEEE 802.16 transform toward IMT-advanced. As a research hotspot in the 3GPP LTE-Advanced and 802.16e, it has obtained lots of attentions. OFDM is one of the common key technologies in LTE and WiMAX. So it is important to study carrier aggregation in OFDM system.The carrier aggregation is introduced in the paper firstly. Then, there are two carrier aggregation methods proposed --- multi-carrier aggregation and direct wideband aggregation. They are compared with the performance of PAPR and BER. The results indicate that the performance of direct wideband mode is better than the other. Due to the better flexibility and backward compatibility, multi-carrier aggregation is supposed to be retained. The combined use of the two aggregations should be considered in future system.Based on the analysis of adjacent-channel interference and out-of-band power, a few suggestions are presented in the thesis. For instance, the reuse of guard band can get gain in system capacity; the principle of carrier spacing is set to ensure backward compatibility with the earlier equipment. In the end, the design of variable-length tree resources naming is given to reduce control signaling overhead in carrier aggregation. These provide low-level simulation foundation for the application of carrier aggregation.

Related Dissertations

  1. Synchronization and Channel Estimation Algorithm in Bursted OFDM System and Its Implementation on FPGA,TN919.3
  2. A Study of the Methods to Reduce Peak-to-average Power Ratio of MIMO-OFDM System,TN919.3
  3. Study on the Related Parameters of High-Speed Mobile Channel,TN919.3
  4. Study on the High-Speed Mobile Channel Estimation,TN919.3
  5. Research and Design of FFT Processor for MIMO-OFDM Applications,TN919.3
  6. The Low Power Research of Adaptive Receiver of OFDM Digital Base-band,TN851
  7. Link Enhancement Technology in High Frequency Sky-wave Communication,TN925
  8. Design and Implementation of Semi-Blind Channel Estimation Based on Matrix Decomposition for MIMO-OFDM Systems,TN919.3
  9. 4G MIMO-OFDM communication system of synchronization,TN929.5
  10. Multi-user downlink MIMO-OFDM systems using the technology interference,TN919.3
  11. Design of LTE Downlink Simulation Platform and Analysis of the Physical Layer Key Technology,TN929.5
  12. Investigation on Channel Estimation Based on Pilot Arrangement in MIMO-OFDM System,TN919.3
  13. Research on Channel Estimation of MIMO-OFDM System,TN919.3
  14. Study of Antenna Selection Technologies im MIMO-OFDM System,TN919.3
  15. Optimization and Implementation for Key Technologies in MIMO-OFDM Transceiver,TN919.3
  16. Research on System Moding Based on 3GPP SCM,TN929.5
  17. Research on the Algorithm for Carrier Synchronization in MIMO-OFDM Systems,TN919.3
  18. Research on Coding in MIMO-OFDM,TN919.3
  19. OFDM Mobile Communications Receivers Implemented with DSP Based on Multiwavelet Noise Reduction,TN851
  20. The OFDM Physical Layer Technology’s Algorithm Research and Implementation That Is Base on the IEEE 802.16e Standard,TN919.3
  21. Study on Performance of NOSTBC-OFDM System,TN919.3

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