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비트-직렬 생성기를 활용한 저면적, 높은 처리율을 가지는 LDPC 복호기 구조
- Alternative Title
- Lee Jea Hack
- Author(s)
- 이재학
- Alternative Author(s)
- Lee Jea Hack
- Advisor
- 선우명훈
- Department
- 일반대학원 전자공학과
- Publisher
- The Graduate School, Ajou University
- Publication Year
- 2017-02
- Language
- eng
- Keyword
- Area-time complexity; bit-serial scheme; low-complexity design; low-density parity-check (LDPC) decoder; minimum-value generator; min-sum algorithm
- Alternative Abstract
- Low-density parity-check (LDPC) codes are one of the block coding techniques that can approach the Shannon’s limit within a fraction of a decibel for high block lengths. Recently, LDPC codes have been chosen to be part of many digital communication systems such as IEEE 802.11ad, IEEE 802.15.3c, and 5G telecommunications standard. As the standards are used to provide multi-Gbps throughput in mobile and portable computing devices, the codes allow effective hardware implementation and simultaneously achieve multi-Gbps decoding. The first two minimum values generator is the most complex module of LDPC decoder. This thesis introduces two low-complexity generators. The proposed bit-serial generator reduces the hardware complexity by approximately 26% compared with the existing bit-serial generator. Since the proposed generator requires long latency, a LDPC decoder using the bit-serial scheme is not suitable for multi-Gbps throughput. To achieve short latency, a bitwise generator is proposed, which is constructed using serially connected w bit-serial generators, where w is the word length. The bitwise generator takes only one clock cycle, reducing the hardware complexity by 15%. As the case studies, I have designed two LDPC decoders, flooding and layered schemes, based on a bitwise generator for the 802.11ad standard with the 90-nm CMOS technology. Compared to conventional decoders for 802.11ad, the decoders achieve the most efficient throughput-area ratio.
- Fulltext
- Appears in Collections:
- Graduate School of Ajou University > Department of Electronic Engineering > 4. Theses(Ph.D)
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