Method and apparatus for quick acquisition of pilot signals usin

Details Method and apparatus for quick acquisition of pilot signals usin Method and apparatus for quick acquisition of pilot signals usin

1997-10-22

2000-07-18

Chin, Stephen

Pulse or digital communications

Repeaters

Testing

375206, 370350, 370515, H04B 169

Patent

active

060917628

ABSTRACT:
When a mobile communication unit (e.g. a cellular telephone) is powered up, the unit must lock on to a local base station, or "acquire" a base station signal, to enable the user to send and receive calls. To lock on a local base station, the mobile unit must determine the delay at which the base station is sending the pseudo random (PN) code. This process is called the "acquisition." The current art of acquiring a base station involves collecting a set of samples at a particular code phase, or delay, testing the collected sample, and repeating these steps using another code phase until the correct code phase is found. The present invention discloses a method and apparatus for collecting a set of samples at a particular code phase, and simultaneously testing the collected sample and collecting the next set of samples for another code phase. Using multiple banks, the system resources such as the dwell accumulators and the DSP are used concurrently to reduce the time required to test the phase delays of the short code to lock on to a base station.

REFERENCES:
patent: 5440597 (1995-08-01), Chung et al.
patent: 5768306 (1998-06-01), Sawahashi et al.
patent: 5901171 (1999-05-01), Kohli et al.
D. Dicarlo, "Multiple Dwell Serial Search: Performance and Application to Direct Sequence Code Acquisition", IEEE Transactions on Communications, vol. COM-31, No. 5, May, 1983, pp. 650-659.

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