Title :
A Parity Check Node Synchronization Based Method for Solving Phase Ambiguity Problem in DVB-S Systems
Author :
Fu, Jielin ; Tang, Yongjun
Author_Institution :
Wireless Network Lab., Beijing Univ. of Posts & Telecommun., Beijing, China
Abstract :
Node synchronization is the process of finding codeword boundaries of convolutional code sequence, and syndrome-based method is an efficient algorithm for node synchronization even at low Eb/N0. In this paper, a method derived from syndrome-based node synchronization is proposed, which is applied for phase ambiguity resolution of DVB-S systems. The method proposed can detect and correct plusmnpi/2 phase ambiguity of pi/4-QPSK modulation. Performance simulation and implement results show that it works properly with Eb/N0 below to 6 dB or less.
Keywords :
convolutional codes; digital video broadcasting; direct broadcasting by satellite; quadrature phase shift keying; synchronisation; DVB-S systems; QPSK modulation; codeword boundaries; convolutional code sequence; parity check node synchronization; phase ambiguity problem; quadrature phase shift keying; syndrome-based method; Baseband; Convolutional codes; Decoding; Delay; Demodulation; Digital video broadcasting; Error analysis; Parity check codes; Phase detection; Viterbi algorithm; node synchronization; phase ambiguity; syndrome; viterbi decoder;
Conference_Titel :
Information Assurance and Security, 2009. IAS '09. Fifth International Conference on
Conference_Location :
Xian
Print_ISBN :
978-0-7695-3744-3
DOI :
10.1109/IAS.2009.211
