Telecommunications – Receiver or analog modulated signal frequency converter – Plural receivers
Reexamination Certificate
2006-04-25
2006-04-25
Nguyen, Simon (Department: 2685)
Telecommunications
Receiver or analog modulated signal frequency converter
Plural receivers
C455S182200, C455S192200, C455S257000, C375S344000
Reexamination Certificate
active
07035605
ABSTRACT:
A method for controlling frequency of a local oscillator in a DS-CDMA type receiver includes transforming a known spread spectrum signal into a sampled digital signal formed of symbols with a despreaded frequency spectrum, and determining a residual frequency error fefor each symbol including a first residual frequency error fe1. The method further includes correcting the frequency of the local oscillator with the residual frequency errors, and determining an average of absolute values of a predetermined number of successive residual frequency errors. The average is compared with a threshold, and if the average is greater than or equal to the threshold, the local oscillator frequency is corrected using an error equal to −sgn(fe1) (1/T−|fe1|), where sgn is the sign function, | | is the absolute value function and T is duration of a symbol before determining the next residual frequency error associated with the next symbol.
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D'Andrea et al.,Design of Quadricorrelators for Automatic Frequency Control Systems, IEEE Transactions on Communications, vol. 41, No. 6, Jun. 6, 1993, pp. 988-997, XP002225621.
Berens Friedbert
Kirsch Miguel
Allen Dyer Doppelt Milbrath & Gilchrist, P.A.
Jorgenson Lisa K.
Nguyen Simon
STMicroelectronics N.V.
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