Method and apparatus for acquiring and tracking pilots in a CDMA communication system
First Claim
1. In a wireless communication system, a method of acquiring signal instances in a received signal, comprising:
- acquiring a frequency of each of one or more candidate signal instances with a respective first frequency control loop;
detecting acquisition on at least one candidate signal instance; and
tracking an average frequency of the at least one acquired signal instance with a second frequency control loop.
1 Assignment
0 Petitions
Accused Products
Abstract
Techniques to acquire and track pilots in a CDMA system. In an aspect, frequency acquisition of a number of signal instances (i.e., multipaths) in a received signal may be achieved concurrently based on a frequency control loop (RAFC) maintained for each finger processor of a rake receiver. Upon successful acquisition, frequency tracking of acquired multipaths may be achieved based on a combination of a frequency control loop (VAFC) maintained for an oscillator used for downconverting the received signal and the RAFCs for the finger processors. In a tracking mode, the VAFC tracks the average frequency of the acquired multipaths by adjusting the frequency of the oscillator. The RAFC of each finger processor tracks the residual frequency error (e.g., due to Doppler frequency shift) of the individual acquired multipath by adjusting the frequency of a complex sinusoidal signal used in a rotator within the finger processor.
-
Citations
46 Claims
-
1. In a wireless communication system, a method of acquiring signal instances in a received signal, comprising:
-
acquiring a frequency of each of one or more candidate signal instances with a respective first frequency control loop;
detecting acquisition on at least one candidate signal instance; and
tracking an average frequency of the at least one acquired signal instance with a second frequency control loop. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
-
-
32. A method of acquiring one or more pilots in a CDMA communication system, comprising:
-
acquiring a frequency of each of one or more candidate signal instances with a respective first frequency control loop;
detecting acquisition on at least one candidate signal instance;
transferring a frequency error of each acquired signal instance from the first frequency control loop to the second frequency control loop;
tracking an average frequency of the at least one acquired signal instance with a second frequency control loop; and
tracking a residual frequency error of each acquired signal instance with the first frequency control loop. - View Dependent Claims (33)
-
-
34. In a wireless communication system, a method of acquiring signal instances in a received signal, comprising:
-
acquiring a frequency of each of one or more candidate signal instances;
detecting frequency acquisition on at least one candidate signal instance based on at least one detector;
performing system acquisition on an acquired signal instance having a best detector output; and
retaining frequency acquisition information for each acquired signal instance for which system acquisition is not performed. - View Dependent Claims (35, 36)
-
-
37. A receiver unit in a wireless communication system, comprising:
-
one or more finger processors operative to acquire frequency of one or more candidate signal instances in a received signal with one or more respective first frequency control loops;
at least one detector operative to detect acquisition on at least one candidate signal instance; and
a second frequency control loop operative to track an average frequency of the at least one acquired signal instance. - View Dependent Claims (38, 39, 40, 41)
-
-
42. A terminal in a CDMA system comprising:
-
one or more finger processors operative to acquire frequency of one or more candidate signal instances in a received signal with one or more respective first frequency control loops;
at least one detector operative to detect acquisition on at least one candidate signal instance; and
a second frequency control loop operative to track an average frequency of the at least one acquired signal instance. - View Dependent Claims (43, 44, 45, 46)
-
Specification