Patent ID: 6795487
Filing Date: 2004-09-21
Classification: G01S,H04B

Abstract:
A receiver for receiving and processing radio-frequency pseudo-random encoded signals, the receiver having a channel comprising:a code replica generator having a first output and being arranged to provide code replica signals on the first output; a mask generator device having a second output and being controllable to provide any one of at least two predetermined time varying mask signals at the second output; a frequency translator having a third output and being arranged to receive and to frequency translate the encoded signals and to provide translated signals at the third output in response thereto; an accumulator; a signal path of the channel comprising, between the frequency translator and the accumulator: a code mixer arranged to mix the translated signals with the code replica signals; a mask mixer arranged to mix the translated signals with the mask signals, the mask signals having a period equal to an integer multiple (1, 2, 3, . . . ) of the chip period of the code replica signals; the mask generator device comprising a plurality of programmable memory elements, each memory element storing one data bit used in providing the mask signals for at least one predetermined part of the mask signal period; a control logic device arranged to provide data bits from at least one of the programmable registers for at least two non-consecutive intervals in the mask signal period; and the control logic device being arranged to provide the mask signal with data bits from at least two programmable registers in sequence and subsequently to provide data bits from the at least two programmable registers in reverse sequence in the mask signal period.