Dissertation > Excellent graduate degree dissertation topics show

Hybrid Automatic Retransmission Research in Mobile Communication Technology

Author: ZhaoZan
Tutor: ZhangLiZuo
School: Harbin Engineering University
Course: Pattern Recognition and Intelligent Systems
Keywords: RTP / RTCP HARQ Adaptive Streaming
CLC: TN929.5
Type: Master's thesis
Year: 2011
Downloads: 14
Quote: 0
Read: Download Dissertation

Abstract


Network technology, the rapid development of communication technology, microelectronics, mobile communications media applications to provide a very broad space. At the same time, mobile communications have long been a single voice calls are not met, the basic features of text-based transmission and data downloads, streaming with its advantages of continuity, real-time and timing being widely applied to various fields of society and even to people's daily lives. Because wireless channel noise, multipath fading and interference caused high error and high packet loss, which gives reliable data transmission belt to a series of questions, so we need to ensure the quality of data transmission error control. The hybrid automatic retransmission is an excellent error control techniques, and design an error-correcting ability and good real-time hybrid automatic retransmission mechanism is the theme of this paper. This paper first introduces the origin of hybrid automatic retransmission. Automatic repeat request (ARQ) and forward error correction ((FEC) is a major technology to solve the transmission problems, forward error correction is belongs to the field of channel coding and describe in detail the implementation of several traditional automatic repeat request mechanism and the current variety of commonly used channel coding method. Both techniques have their advantages and disadvantages exists, people will be the advantages of both rolled proposed the technique of hybrid automatic retransmission. subsequently detailed herein are three basic types of hybrid automatic the realization of the principle of the hybrid automatic retransmission mechanism and a nearly constant transmission delay retransmission mechanism, as well as their advantages and disadvantages, in preparation for the final improvement program. shortcomings and deficiencies of this article for this TCP and UDP protocols, and for multimedia data according to the specific application of streaming media in mobile communications, RTP / RTCP protocol data transmission between the sending and receiving ends must comply with the relevant agreement, the Real-time Transport Protocol (RTP) and Real-time Transport Control Protocol RTCP is defined by IETF stream transport protocol, the former is responsible for data transmission, and the latter for the reliable transmission of data to provide assurance but they just provide a an agreement framework, specific application may be needed conducted Add and excision. Finally additive white Gaussian noise (AWGN) letter Road mixed type Ⅱ ARQ technology will improve in packet loss, bit error, the third generation mobile communication recommended protocols and TCP protocol simulation comparison, you can verify that the advantage of the improved performance of the agreement. nearly constant transmission delay a hybrid automatic retransmission technical shortcoming its improvements, proposed a modified protocol based on RTP / RTCP adaptive HARQ technique reported by the sender and the receiver side report to determine whether retransmission is necessary, according to the channel conditions, adaptive adjust the encoding bit rate, and to distinguish between retransmission decoding failed or packet loss. effectively improve the utilization of feedback information to reduce the number of retransmissions, select the appropriate redundancy rate and to ensure that information about the correct transfer rate .

Related Dissertations

  1. Design and Research on Stabilization Loop of Gyro Stabilized Pod Control System,V241.5
  2. Robust Adaptive Control Algorithms Research for the System of Spacecraft Attitude Dynamics,V448.22
  3. Research on Spread Spectrum Code Acquisition of Double Threshold Based on Sliding Correlator,TN914.42
  4. Study of Synchronization and Adaptive Frequency in Frequency-Hopping System,TN914.41
  5. The Technology Research on Channel Coding and Channel Estimation in MC-CDMA Systems,TN929.533
  6. Video Coding Research Based on Texture Characteristics,TP391.41
  7. Research on Removal Algorithm of Shadows in Image Segmentation,TP391.41
  8. Study on Nonlinear Variable Structure Guidance Law,TJ765
  9. Optimal Synchronization Control of a Class of Underactuated Lagrangian Systems,TP13
  10. Adaptive Control of Post-Boost Vehicle Using Multiple Models,TP273.2
  11. Application and Research of Dual Control in Vertical Landing Aircraft,TP273
  12. Design of Gyro Stabilized Pod Control System,TP273
  13. Study on Adaptive Fuzzy Control Algorithm and Its Implementation,TP273.4
  14. Image-Guided Adaptive Radiation Therapy of Intensity-Modulated Radiation for Cervical Cancer,R737.33
  15. Research on synchronization control of chaotic systems,O415.5
  16. Research of Anomaly Detection Algorithms of Hyperspectral Imagery Based on Kernel Method,TP751
  17. Active Power Filter and Its Application in Distribution Network,TN713.8
  18. Research on Adaptive Control of Recovery of UUV with Near Wall Constraint,TP273
  19. Research on Key Technologies for Image Compression and Transmission in Telemedical System,R318.0
  20. Research and Design on Indoor Localization System Based on ZigBee,TN929.5
  21. An Adaptive Processing Node Selection Based Spatio-Temporal Query Alogrithm,TN929.5

CLC: > Industrial Technology > Radio electronics, telecommunications technology > Wireless communications > Mobile Communications
© 2012 www.DissertationTopic.Net  Mobile