Dissertation > Excellent graduate degree dissertation topics show

Research on Multicarrier Modulation with Nonuniform Carrier Spaces

Author: XieShiChang
Tutor: ChenFangJiong
School: South China University of Technology
Course: Communication and Information System
Keywords: Multi - carrier modulation Fourier transform Warping discrete Fourier transform OFDM
CLC: TN919.3
Type: Master's thesis
Year: 2010
Downloads: 47
Quote: 0
Read: Download Dissertation

Abstract


Multicarrier modulation technique is a kind of parallel data processing , effective against multipath fading , can improve the data transfer rate of the wireless band-limited channel . As the main multi-carrier modulation technique , the conventional orthogonal frequency division multiplexing (OFDM) technology with a uniform spacing of sub - carrier modulation , the channel gain of each sub-carrier is the channel frequency response of the uniform sampling . Thus, when the channel to different sub-carriers having a different gain , this approach fails to consider the degree of attenuation of the respective sub - carriers to the channel . This paper presents a non-uniform carrier spacing in multi - carrier modulation method . This modulation method is based on the general discrete Fourier transform , the main features of the proposed multi-carrier modulation carrier spacing adjustable . In the case of access to the channel state information , according to the channel state information using the appropriate spacing of the carrier modulation and demodulation , and good in the state of the channel frequency band using denser spacing of the carrier , while in the poor state of the channel frequency band used compared with sparse spacing of the carrier , to get a better system error performance . The new method is based on wireless channel state information , it is necessary to study the characteristics and modeling of the radio channel . The wireless channel is usually time-varying channel , large-scale and small -scale fading characteristics . Algorithm simulation using indoor channel model . The warpage of the discrete Fourier transform can be through a warping the allpass function adjusting sampling frequency distribution, typically used for signal processing to improve the accuracy of the spectral analysis . The warpage of the discrete Fourier transform of introducing the concept of communication on this basis , based on the general discrete Fourier transform of multi-carrier modulation of the non-uniform carrier spacing . This article describes the selection method of non - uniform spacing carrier modulation and demodulation process data as well as the use of general discrete Fourier matrix Finally, computer simulation and results analysis .

Related Dissertations

  1. Synchronization and Channel Estimation Algorithm in Bursted OFDM System and Its Implementation on FPGA,TN919.3
  2. Analysis of Spread Spectrum Signals Based on FRFT,TN911.6
  3. Research on Improvement of DSSS Receiver Based on Phase Domain,TN914.42
  4. Analysis of Infrared Spectral Features and Identification of Al-responsive Genes in Small Black Soybean with Aluminum Stress,S529
  5. The Research on Reliability of Low-Voltage Power Line Communication,TM73
  6. Guide heliocentric orbit simulation Research and Improvement,O53
  7. A Study of the Methods to Reduce Peak-to-average Power Ratio of MIMO-OFDM System,TN919.3
  8. Research on Sidelobe Suppression for NC-OFDM Systems,TN919.3
  9. Research on Channel Estimation Technique in OFDM System,TN919.3
  10. Application of the Fractional Fourier Transform to ISAR Maneuvering Target Imaging,TN957.52
  11. The Anti-interference Research of Cell in LTE System,TN929.5
  12. Research on the Reduction of Peak to Average Power Ratio in SLM OFDM Systems,TN919.3
  13. Study on Frequency Offset Estimation in High-Speed Mobile Environment,TN919.3
  14. Research on PAPR Technology of Wavelet Packet Multicarrier Modulation System,TN919.3
  15. Study on the Related Parameters of High-Speed Mobile Channel,TN919.3
  16. Study on the High-Speed Mobile Channel Estimation,TN919.3
  17. Single-Channel Color Image Encryption Algorithms with Chaos and Fractional Fourier Transform,TP309.7
  18. Purification of an Estrogen Receptor from Carp and the Interaction with Phthalic Acid Esters (PAEs),S917.4
  19. Research and Design of Electronic Equalization Based on Most Likelihood Sequence Estimation,TN911.5
  20. The Low Power Operation Design of OFDM Communication System,TN919.3
  21. OOK-OFDM Hybrid Modulation and Channel Coding of Visible Light Communication,TN911.22

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