Patent ID: 7212565
Filing Date: 2007-05-01
Classification: G01S,H04B,H04J

Abstract:
1. Method for generating an internal sequence of analog values that are synchronous to an external sequence coded in a received signal, the analog values having a specific period, which corresponds to and is synchronous with the external sequence, and the external sequence comprising repetitions of a fundamental sequence of length N, which substantially corresponds to a sequence of binary values which can be produced by logical combination of a first generating binary sequence of length N with a non-constant second generating binary sequence of length N, the first generating binary sequence being capable of being generated by a binary feedback shift register of length n, in which a next value of the first generating binary sequence is produced in each case by binary logical combination of an oldest value of the binary feedback shift register with at least one subsequent value of the binary feedback shift register following the oldest value, according to a fixed feedback pattern, and no segment of the length n occurs more often than once in the fundamental sequence, so that the position of such a segment is uniquely determined with respect to the fundamental sequence the method comprising: producing an intermediate value by a logical combination of an actual value of the external sequence with an actual value of a second generating sequence; producing an input value to an analog feedback shift register by superposition of the intermediate value with an analog feedback value derived according to a feedback function from analog values in the analog feedback shift register, the analog feedback shift register having a length n and including a feedback pattern corresponding to a feedback pattern of the binary feedback shift register; feeding the input value to an input of the analog feedback shift register; and a position of an actual value of the second generating sequence corresponding to a position of a segment with respect to the first generating sequence, the segment including a determinative set of n binary values derived from the analog values in the analog feedback shift register.