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A NOVEL SEMI-BLIND TIME-FREQUENCY DOMAIN TRACKING ALGORITHM SUITABLE FOR MPSK-OFDM
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作者 Wei Li Xu Youyun Cai Yueming Pan Xiaofei 《Journal of Electronics(China)》 2008年第2期150-156,共7页
This paper presents a semi-blind tracking algorithm used for Multiple Phase Shift Keying based Orthogonal Frequency Division Multiplexing(MPSK-OFDM) system. By using special pream-bles to assist the decision of a feed... This paper presents a semi-blind tracking algorithm used for Multiple Phase Shift Keying based Orthogonal Frequency Division Multiplexing(MPSK-OFDM) system. By using special pream-bles to assist the decision of a feedback loop and to solve the problem of phase ambiguity,the tracking performance of the algorithm has been improved greatly. Only a few preambles are needed in the al-gorithm since the preambles are not used to estimate the frequency offset but used to provide the variation information of the phase due to the presence of frequency offset. Simulations verify that the algorithm has low SNR bound for tracking as well as high tracking accuracy and the tracking range is expanded to 30% of one subcarrier spacing. 展开更多
关键词 Phase ambiguity multiple Phase shift Keying based Orthogonal frequency Division multiplexing (MPSK-OFDM) SEMI-BLIND TRACKING
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DESIGN OF MODULATION AND COMPRESSION CODING IN UNDERWATER ACOUSTIC IMAGE TRANSMISSION
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作者 程恩 余丽敏 林耿超 《Chinese Journal of Oceanology and Limnology》 SCIE CAS CSCD 2002年第3期202-207,共6页
This paper describes the design of modulation, compression coding and transmission control in underwater acoustic color image transmission system. This design adapts a special system of modulation and transmission con... This paper describes the design of modulation, compression coding and transmission control in underwater acoustic color image transmission system. This design adapts a special system of modulation and transmission control based on a DSP(Digital Signal Processing) chip, to cope with the complex underwater acoustic channel. The hardware block diagram and software flow chart are presented. 展开更多
关键词 underwater image transmission MFSK (multiple frequency shifting Keying) RLE (Route Length Encode) DSP
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