한국해양대학교

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광대역 무선 통신을 위한 고속 적응형 터보 복호기 FPGA 설계

Title
광대역 무선 통신을 위한 고속 적응형 터보 복호기 FPGA 설계
Alternative Title
An FPGA Design of High-Speed Adaptive Turbo Decoder for Broadband Wireless Communications
Author(s)
최덕군
Publication Year
2006
Publisher
한국해양대학교 대학원
URI
http://kmou.dcollection.net/jsp/common/DcLoOrgPer.jsp?sItemId=000002174627
http://repository.kmou.ac.kr/handle/2014.oak/8689
Abstract
This thesis proposes an adaptive turbo decoding algorithm for high order modulation scheme combined with original design for a standard rate-1/2 turbo decoder for B/QPSK modulation. A transformation applied to the incoming I-channel and Q-channel symbols allows the use of an off-the-shelf B/QPSK turbo decoder without any modifications. Adaptive turbo decoder processes the received symbols recursively to improve the performance. As the number of iterations increases, the execution time and power consumption also increase as well. To reduce the latency and power consumption, this thesis employs the combination of the radix-4, dual-path processing, parallel decoding, and early-stop algorithms. This thesis implemented the proposed scheme on a field-programmable gate array (FPGA) and compared its decoding speed with that of a conventional decoder. From the result of implementation, it was found that the decoding speed of proposed adaptive decoding is faster than that of conventional scheme by 6.4 times under the following conditions : N=212, iteration=3, 8-states, 3 iterations, and 8PSK modulation scheme.
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전파공학과 > Thesis
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