LMMSE Channel Estimation for IEEE 802.16e and 802.16m OFDMA Downlink
碩士 === 國立交通大學 === 電子工程系所 === 98 === OFDMA (orthogonal frequency division multiple access) technique has drawn much interest recently in the mobile transmission environment and been successfully applied to a wide variety of digital communications applications over the past several years. One of the m...
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ndltd-TW-098NCTU54280702016-04-25T04:27:14Z http://ndltd.ncl.edu.tw/handle/39985531924885606593 LMMSE Channel Estimation for IEEE 802.16e and 802.16m OFDMA Downlink IEEE802.16e與802.16mOFDMA下行通道之線性最小均方差通到估計 Wang, Chih-Wei 王志偉 碩士 國立交通大學 電子工程系所 98 OFDMA (orthogonal frequency division multiple access) technique has drawn much interest recently in the mobile transmission environment and been successfully applied to a wide variety of digital communications applications over the past several years. One of the main reason to use OFDMA is its robustness against frequency selective fading and narrowband interference. We focus on the OFDMA downlink channel estimation based on IEEE 802.16e and 802.16m. We present two channel estimation methods. One is advanced 4-point linear interpolation. First, we use LS estimator on pilot subcarriers because of its low computational complexity. Second, we estimate the channel response in the middle of the pilot location in the time domain. Finally we estimate the channel response on data subcarriers using linear interpolation in the frequency domain. The other method is LMMSE channel estimation, First, we use LS estimator on pilot subcarriers, and do linear interpolation at the pilot location in time. Second, we estimate the delay parameters. Third, we find the autocorrelation function associated with the approximate PDP. Finally base on this autocorrelation function, do LMMSE filtering to estimate the data subcarrier response. We verify our simulation model on AWGN channel and then do the simulation on multipath channels for IEEE 802.16e and 802.16m. In this thesis, we first introduce the standard of the IEEE 802.16e and 802.16m OFDMA downlink. Then we describe the channel estimation methods we use and discuss the performance in each transmission condition for IEEE 802.16e and 802.16m. Lin, David 林大衛 2009 學位論文 ; thesis 107 en_US |
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碩士 === 國立交通大學 === 電子工程系所 === 98 === OFDMA (orthogonal frequency division multiple access) technique has drawn
much interest recently in the mobile transmission environment and been successfully
applied to a wide variety of digital communications applications over the past several
years. One of the main reason to use OFDMA is its robustness against frequency
selective fading and narrowband interference. We focus on the OFDMA downlink
channel estimation based on IEEE 802.16e and 802.16m.
We present two channel estimation methods. One is advanced 4-point linear
interpolation. First, we use LS estimator on pilot subcarriers because of its low
computational complexity. Second, we estimate the channel response in the middle of
the pilot location in the time domain. Finally we estimate the channel response on
data subcarriers using linear interpolation in the frequency domain. The other method
is LMMSE channel estimation, First, we use LS estimator on pilot subcarriers, and do
linear interpolation at the pilot location in time. Second, we estimate the delay
parameters. Third, we find the autocorrelation function associated with the
approximate PDP. Finally base on this autocorrelation function, do LMMSE filtering
to estimate the data subcarrier response. We verify our simulation model on AWGN
channel and then do the simulation on multipath channels for IEEE 802.16e and
802.16m.
In this thesis, we first introduce the standard of the IEEE 802.16e and 802.16m
OFDMA downlink. Then we describe the channel estimation methods we use and
discuss the performance in each transmission condition for IEEE 802.16e and
802.16m.
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author2 |
Lin, David |
author_facet |
Lin, David Wang, Chih-Wei 王志偉 |
author |
Wang, Chih-Wei 王志偉 |
spellingShingle |
Wang, Chih-Wei 王志偉 LMMSE Channel Estimation for IEEE 802.16e and 802.16m OFDMA Downlink |
author_sort |
Wang, Chih-Wei |
title |
LMMSE Channel Estimation for IEEE 802.16e and 802.16m OFDMA Downlink |
title_short |
LMMSE Channel Estimation for IEEE 802.16e and 802.16m OFDMA Downlink |
title_full |
LMMSE Channel Estimation for IEEE 802.16e and 802.16m OFDMA Downlink |
title_fullStr |
LMMSE Channel Estimation for IEEE 802.16e and 802.16m OFDMA Downlink |
title_full_unstemmed |
LMMSE Channel Estimation for IEEE 802.16e and 802.16m OFDMA Downlink |
title_sort |
lmmse channel estimation for ieee 802.16e and 802.16m ofdma downlink |
publishDate |
2009 |
url |
http://ndltd.ncl.edu.tw/handle/39985531924885606593 |
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