Frame Synchronization Techniques and Performance Evaluation for OFDM-Based Systems
碩士 === 國立交通大學 === 電信工程系所 === 92 === Bandwidth efficiency and multipath immunity make orthogonal frequency division multiplexing (OFDM) an attractive modulation technique for modern high data rate communication systems. A major concern of OFDM systems is that symbol timing and frequency synchronizat...
Main Authors: | , |
---|---|
Other Authors: | |
Format: | Others |
Language: | en_US |
Published: |
2004
|
Online Access: | http://ndltd.ncl.edu.tw/handle/98s888 |
id |
ndltd-TW-092NCTU5437025 |
---|---|
record_format |
oai_dc |
spelling |
ndltd-TW-092NCTU54370252019-05-15T19:38:01Z http://ndltd.ncl.edu.tw/handle/98s888 Frame Synchronization Techniques and Performance Evaluation for OFDM-Based Systems 應用於正交分頻多工系統之框碼同步方法及其效能評估 Ke-Wei Jhan 詹克偉 碩士 國立交通大學 電信工程系所 92 Bandwidth efficiency and multipath immunity make orthogonal frequency division multiplexing (OFDM) an attractive modulation technique for modern high data rate communication systems. A major concern of OFDM systems is that symbol timing and frequency synchronization errors can seriously degrade the system performance. Therefore, it is important to obtain accurate estimate of time and frequency offsets. In this thesis, we focus on frame timing synchronization. Several cyclic prefix based techniques are investigated and two modified algorithms based on global search algorithm are proposed. In the local search algorithm, we only search the sample points near the estimated point of previous frame; this can increase the accuracy of estimated timing at high SNR. Another algorithm, called modified global search algorithm, yields a comparable performance and lower complexity compared with other techniques. Our proposed algorithms are all self-learning in the sense that they can automatically track slowly time varying channel conditions. The performance and complexity of our proposed algorithms will be compared with other cyclic prefix based algorithms from simulation results. Tsern-Huei Lee 李程輝 2004 學位論文 ; thesis 77 en_US |
collection |
NDLTD |
language |
en_US |
format |
Others
|
sources |
NDLTD |
description |
碩士 === 國立交通大學 === 電信工程系所 === 92 === Bandwidth efficiency and multipath immunity make orthogonal frequency division multiplexing (OFDM) an attractive modulation technique for modern high data rate communication systems. A major concern of OFDM systems is that symbol timing and frequency synchronization errors can seriously degrade the system performance. Therefore, it is important to obtain accurate estimate of time and frequency offsets. In this thesis, we focus on frame timing synchronization. Several cyclic prefix based techniques are investigated and two modified algorithms based on global search algorithm are proposed. In the local search algorithm, we only search the sample points near the estimated point of previous frame; this can increase the accuracy of estimated timing at high SNR. Another algorithm, called modified global search algorithm, yields a comparable performance and lower complexity compared with other techniques. Our proposed algorithms are all self-learning in the sense that they can automatically track slowly time varying channel conditions. The performance and complexity of our proposed algorithms will be compared with other cyclic prefix based algorithms from simulation results.
|
author2 |
Tsern-Huei Lee |
author_facet |
Tsern-Huei Lee Ke-Wei Jhan 詹克偉 |
author |
Ke-Wei Jhan 詹克偉 |
spellingShingle |
Ke-Wei Jhan 詹克偉 Frame Synchronization Techniques and Performance Evaluation for OFDM-Based Systems |
author_sort |
Ke-Wei Jhan |
title |
Frame Synchronization Techniques and Performance Evaluation for OFDM-Based Systems |
title_short |
Frame Synchronization Techniques and Performance Evaluation for OFDM-Based Systems |
title_full |
Frame Synchronization Techniques and Performance Evaluation for OFDM-Based Systems |
title_fullStr |
Frame Synchronization Techniques and Performance Evaluation for OFDM-Based Systems |
title_full_unstemmed |
Frame Synchronization Techniques and Performance Evaluation for OFDM-Based Systems |
title_sort |
frame synchronization techniques and performance evaluation for ofdm-based systems |
publishDate |
2004 |
url |
http://ndltd.ncl.edu.tw/handle/98s888 |
work_keys_str_mv |
AT keweijhan framesynchronizationtechniquesandperformanceevaluationforofdmbasedsystems AT zhānkèwěi framesynchronizationtechniquesandperformanceevaluationforofdmbasedsystems AT keweijhan yīngyòngyúzhèngjiāofēnpínduōgōngxìtǒngzhīkuāngmǎtóngbùfāngfǎjíqíxiàonéngpínggū AT zhānkèwěi yīngyòngyúzhèngjiāofēnpínduōgōngxìtǒngzhīkuāngmǎtóngbùfāngfǎjíqíxiàonéngpínggū |
_version_ |
1719091794928467968 |