Performance analysis of IEEE 802.16e TBCC decoder
碩士 === 國立臺北科技大學 === 電腦與通訊研究所 === 97 === In this paper, We discuss how to decrease TBCC(Tail-Biting Convolutional Codes) memory and maintain optimal error rate in channel coding system of 802.16e OFDMA(Orthogonal Frequency-Division Multiple Access ; OFDMA) standard. We use AWGN (Additive White Gaussi...
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ndltd-TW-097TIT056521362019-08-03T15:50:39Z http://ndltd.ncl.edu.tw/handle/jrhjug Performance analysis of IEEE 802.16e TBCC decoder IEEE 802.16e 去尾迴旋碼解碼器效能分析 Yao-Yu Tsai 蔡燿宇 碩士 國立臺北科技大學 電腦與通訊研究所 97 In this paper, We discuss how to decrease TBCC(Tail-Biting Convolutional Codes) memory and maintain optimal error rate in channel coding system of 802.16e OFDMA(Orthogonal Frequency-Division Multiple Access ; OFDMA) standard. We use AWGN (Additive White Gaussian Noise) channel and Rayleigh fading channel as the simulation environment. TBCC decoder adopts soft-decision, the optimal TBCC decoder adopts maximum likelihood decoding algorithm, although it has the optimal error rate, but it needs high complexity and memory demand. To decrease system complexity and memory demand, we combine circular viterbi decoder with sliding window, and it's suitable for hardware implementation. However, the adding length of sliding window and tail are affected by other factor such as code rate, modulation, encoding block length and channel environment. So we find and suitable length of sliding window and tail in different channel environment. The factor is according to 802.16e OFDMA standard. This result can be referred for har ware implementation. 劉玉蓀 2009 學位論文 ; thesis 37 zh-TW |
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碩士 === 國立臺北科技大學 === 電腦與通訊研究所 === 97 === In this paper, We discuss how to decrease TBCC(Tail-Biting Convolutional Codes) memory and maintain optimal error rate in channel coding system of 802.16e OFDMA(Orthogonal Frequency-Division Multiple Access ; OFDMA) standard. We use AWGN (Additive White Gaussian Noise) channel and Rayleigh fading channel as the simulation environment. TBCC decoder adopts soft-decision, the optimal TBCC decoder adopts maximum likelihood decoding algorithm, although it has the optimal error rate, but it needs high complexity and memory demand. To decrease system complexity and memory demand, we combine circular viterbi decoder with sliding window, and it's suitable for hardware implementation. However, the adding length of sliding window and tail are affected by other factor such as code rate, modulation, encoding block length and channel environment. So we find and suitable length of sliding window and tail in different channel environment. The factor is according to 802.16e OFDMA standard. This result can be referred for har ware implementation.
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劉玉蓀 |
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劉玉蓀 Yao-Yu Tsai 蔡燿宇 |
author |
Yao-Yu Tsai 蔡燿宇 |
spellingShingle |
Yao-Yu Tsai 蔡燿宇 Performance analysis of IEEE 802.16e TBCC decoder |
author_sort |
Yao-Yu Tsai |
title |
Performance analysis of IEEE 802.16e TBCC decoder |
title_short |
Performance analysis of IEEE 802.16e TBCC decoder |
title_full |
Performance analysis of IEEE 802.16e TBCC decoder |
title_fullStr |
Performance analysis of IEEE 802.16e TBCC decoder |
title_full_unstemmed |
Performance analysis of IEEE 802.16e TBCC decoder |
title_sort |
performance analysis of ieee 802.16e tbcc decoder |
publishDate |
2009 |
url |
http://ndltd.ncl.edu.tw/handle/jrhjug |
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