A Unique Word Detection Scheme for High-Speed Satellite Communications

Myung Sup KIM  Deock Gil OH  

IEICE TRANSACTIONS on Communications   Vol.E83-B   No.11   pp.2562-2565
Publication Date: 2000/11/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Satellite and Space Communications
unique,  word,  detection,  carrier,  phase and satellite,  

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We propose a unique word detection scheme having the correction of the phase ambiguity that remains in the output of a carrier recovery circuit for QPSK systems. The performance of the proposed scheme is analyzed by obtaining the probability generating function (PGF) for the output of the detector. The PGF is obtained from the z-transform of the probability density function (PDF) for each matched symbol with the reference symbol and by using the characteristics at this time that the random variables for matched symbols are independent and identically distributed. Then the total PGF for a unique word is obtained from powering the PGF for the individual symbol. From the total PGF, the length of a UW and the threshold value for detection can be obtained with a detection probability defined in a required system specification.