Abstract: A method for tracking a locally generated spread spectrum signal sequence includes the step of correcting the spread spectrum signal sequences with respect to the synchronization time in an early/late interval. The correlation responses are subtracted from one another and the clock of the locally generated spread spectrum signal sequence is controlled as a function of the subtraction. Correlations are performed through the use of at least two hierarchically graduated closed-loop controls having different early/late intervals. The early interval of the one closed-loop control having a small early/late interval must not become earlier than the early interval of the other closed-loop control system having a next-larger early/late interval. Furthermore, the late intervals of the one closed-loop control system having a small early/late interval must not become later than the late interval of the other closed-loop control system having a next-larger early/late interval.

Abstract: An acquisition method for identifying a transmitter, and a correlator for carrying out the method includes correlating a received binary-coded spread sequence having m bits at a frequency f with a locally generated spread sequence by phase-shifting a multiplicity of locally generated spread sequences with respect to the received spread sequence, where f is the frequency of the incoming spread sequence. The received spread sequence is correlated with a locally generated spread sequence at the frequency f. The received spread sequence is stored and the stored, received spread sequence is processed at an oversampling rate i*f. The received, stored spread sequence is split into i sections and the correlation is carried out in i steps. The correlator includes a shift register with feedback. Register positions of the shift register are connected in parallel to a memory input, and the memory output is connected in parallel with the register positions.

Abstract: A communications acquisition method includes a correlation of a received, coded spread sequence having a length of m bits with a locally generated spread sequence m times, in each case delayed by one bit, in order to form m correlation responses. Each correlation response is added, with a delay, to a succeeding correlation response to form a correlation result, the delay being an integer multiple of m and of a further bit. Finally, a maximum search is carried out over all m correlation results. A configuration for carrying out the method includes a correlator having an output connected to a first input of an adder and also to a second input of the adder through a delay element.

Abstract: A method and a signal evaluator determine a noise part in a signal mix of a reception signal of a CDMA receiver. An additional spread code with which the reception signal is despread is formed at the reception side in addition to the individual spread codes of the individual CDMA connections. The resulting reference signal is subsequently evaluated and the noise part is determined from the reference signal.