Pulse or digital communications – Repeaters – Testing
Patent
1997-11-21
2000-09-05
Vo, Don N.
Pulse or digital communications
Repeaters
Testing
375208, H04B 1500, H04K 100, H04L 2730
Patent
active
06115413&
ABSTRACT:
A differential receiver which receives a signal corresponding to transmission of a carrier modulated by symbols S.sub.k, where k is an integer designating an order of the symbol, each symbol S.sub.k has a duration Ts and carries information, and the symbols S.sub.k have been multiplied by a psuedorandom sequence. The differential receiver includes a first processing channel configured to receive a first part of the transmitted signal in phase with the carrier to generate samples I.sub.k and delayed samples I.sub.k-1. The receiver further includes a second processing channel configured to receive a second part of the transmitted signal in phase quadrature with the carrier to generate samples Q.sub.k and delayed samples Q.sub.k-1. In addition, the receiver includes a multiplication circuit configured to generate a signal Dot(k) equal to I.sub.k I.sub.k-1 +Q.sub.k Q.sub.k-1 and a signal Cross(k) equal to Q.sub.k I.sub.k-1 -I.sub.k Q.sub.k-1, a calculating mechanism configured to calculate, for each order k of a symbol, the following equation: E=[Dot(k).sup.2 +Cross(k).sup.2 ].sup.1/2, and configured to calculate a mean E.sup.moy, a weighting circuit having two multipliers configured to respectively multiply the signal E.sup.moy and the signals Dot(k) and Cross(k) to obtain a mean signal Dot(k).sup.moy and a mean signal Cross(k).sup.moy, and a circuit configured to receive the mean signal Dot(k).sup.moy and the mean signal Cross(k).sup.moy supplied by the calculating mechanism to integrate the mean signals on the time of a symbol and restore the corresponding information.
REFERENCES:
patent: 5609155 (1997-03-01), Guracar
patent: 5757845 (1998-05-01), Fukawa et al.
patent: 5768307 (1998-06-01), Schramm et al.
patent: 5778022 (1998-07-01), Walley
patent: 5909462 (1999-06-01), Kamerman et al.
Daniele Norbert
Lattard Didier
Lequepeys Jean-Rene
Piaget Bernard
Commissariat a l''Energie Atomique
Phu Phuong
Vo Don N.
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