Proceedings of the IEEK Conference (대한전자공학회:학술대회논문집)
- 2004.06a
- /
- Pages.43-46
- /
- 2004
Carrier phase recovery algorithm for LDPC coded system
LDPC 코드를 이용한 위상 동기 알고리즘
- Lee Juhyung (Information and communication University (ICU)) ;
- Kim Namshik (Information and communication University (ICU)) ;
- Park Hyuncheol (Information and communication University (ICU)) ;
-
Kim Pansu
(Electronics and Telecommunications Research Institute (ETRI))
;
-
Oh Dukgil
(Electronics and Telecommunications Research Institute (ETRI))
;
-
Lee Hojin
(Electronics and Telecommunications Research Institute (ETRI))
- 이주형 (한국정보통신대학원대학교) ;
- 김남식 (한국정보통신대학원대학교) ;
- 박현철 (한국정보통신대학원대학교) ;
-
김판수
(한국전자통신연구원)
;
-
오덕길
(한국전자통신연구원)
;
-
이호진
(한국전자통신연구원)
- Published : 2004.06.01
Abstract
In this paper, we present a carrier phase estimation algorithm for LDPC coded systems. LDPC coded system can not achieve the ideal performance if phase offset is introduced by channel. However, the estimation of phase offset is very hard since the operating point of LDPC is very low SNR. To solve this problem, the algorithm using the tentative soft decision value and based on Maximum Likelihood (ML), was proposed in [2]. But this algorithm has problem which works only under constant phase offset. If phase offset is time variant, it has a severe degradation in performance. To solve this problem. we propose two types of estimators. symbol by symbol estimator: Unidirectional estimator (UDE) and hi-directional estimator (BDE), and sub-block estimator (SBE).
Keywords