Iterative Kalman Channel Estimation and Parallel Interference Cancellation for Synchronous CDMA Mobile Radio Channels
碩士 === 長庚大學 === 電機工程研究所 === 90 === In synchronous CDMA system, the traditional two-stage channel estimation (Kalman filter) which was combining multiuser detection (PIC) must use the decorrelator to be first stage structure. We can see the decorrelator has two disadvantages. One is that t...
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ndltd-TW-090CGU004420032015-10-13T17:34:59Z http://ndltd.ncl.edu.tw/handle/70687898262071168946 Iterative Kalman Channel Estimation and Parallel Interference Cancellation for Synchronous CDMA Mobile Radio Channels 在同步CDMA通道環境下利用反覆式Kalman通道估測器結合PIC多使用者接收器 Yu-Chung Tu 涂又中 碩士 長庚大學 電機工程研究所 90 In synchronous CDMA system, the traditional two-stage channel estimation (Kalman filter) which was combining multiuser detection (PIC) must use the decorrelator to be first stage structure. We can see the decorrelator has two disadvantages. One is that the complexity of decorrelating filter is raised rapidly when the number of users increases .The other is that decorrelator would have bad effect of noise enhancement. The channel estimate using Kalman filters become more difficult as the noise is enhanced. For solving these problems, we propose a new multistage (iterative) structure where Kalman channel estimation and parallel interference cancellation multiuser detection are conducted in every stage (iteration).we get rid of decorrelating filter and use iterative way to estimate the channel coefficient and multiuser detection. In this situation, the estimation of channel coefficient using Kalman filter won’t be precise. However, we can find that the MAI term is removed gradually while signal is passing through more iteration. At the end of this paper; we compare traditional two-stage detector with our new detector. Simulation result shows that our new proposed detector’s performance be superior to traditional two-stage detector’s performance in the Rayleigh fading channel whether the near far problem exist or nor. Chuan-Chun Chiou Shu-Ming Tseng 邱創群 曾恕銘 2002 學位論文 ; thesis 60 zh-TW |
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碩士 === 長庚大學 === 電機工程研究所 === 90 === In synchronous CDMA system, the traditional two-stage channel estimation (Kalman filter) which was combining multiuser detection (PIC) must use the decorrelator to be first stage structure. We can see the decorrelator has two disadvantages. One is that the complexity of decorrelating filter is raised rapidly when the number of users increases .The other is that decorrelator would have bad effect of noise enhancement. The channel estimate using Kalman filters become more difficult as the noise is enhanced. For solving these problems, we propose a new multistage (iterative) structure where Kalman channel estimation and parallel interference cancellation multiuser detection are conducted in every stage (iteration).we get rid of decorrelating filter and use iterative way to estimate the channel coefficient and multiuser detection. In this situation, the estimation of channel coefficient using Kalman filter won’t be precise. However, we can find that the MAI term is removed gradually while signal is passing through more iteration. At the end of this paper; we compare traditional two-stage detector with our new detector. Simulation result shows that our new proposed detector’s performance be superior to traditional two-stage detector’s performance in the Rayleigh fading channel whether the near far problem exist or nor.
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Chuan-Chun Chiou |
author_facet |
Chuan-Chun Chiou Yu-Chung Tu 涂又中 |
author |
Yu-Chung Tu 涂又中 |
spellingShingle |
Yu-Chung Tu 涂又中 Iterative Kalman Channel Estimation and Parallel Interference Cancellation for Synchronous CDMA Mobile Radio Channels |
author_sort |
Yu-Chung Tu |
title |
Iterative Kalman Channel Estimation and Parallel Interference Cancellation for Synchronous CDMA Mobile Radio Channels |
title_short |
Iterative Kalman Channel Estimation and Parallel Interference Cancellation for Synchronous CDMA Mobile Radio Channels |
title_full |
Iterative Kalman Channel Estimation and Parallel Interference Cancellation for Synchronous CDMA Mobile Radio Channels |
title_fullStr |
Iterative Kalman Channel Estimation and Parallel Interference Cancellation for Synchronous CDMA Mobile Radio Channels |
title_full_unstemmed |
Iterative Kalman Channel Estimation and Parallel Interference Cancellation for Synchronous CDMA Mobile Radio Channels |
title_sort |
iterative kalman channel estimation and parallel interference cancellation for synchronous cdma mobile radio channels |
publishDate |
2002 |
url |
http://ndltd.ncl.edu.tw/handle/70687898262071168946 |
work_keys_str_mv |
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