Method and apparatus for performing search acquisition in a CDMA communication system
First Claim
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1. A method for determining a synchronized PN sequence, comprising the steps of:
- demodulating a received signal by a first plurality of PN sequences of a first set of windows of PN sequences determined in accordance with a first window parameter format to provide a first set of demodulation metrics;
analyzing said first set of demodulation metrics to determine whether said synchronized PN sequence is of said first plurality of PN sequences; and
demodulating said received signal by a second plurality of PN sequences of a second set of windows of PN sequences determined in accordance with a second window parameter format to provide a second set of demodulation metrics;
wherein said first window parameter format further comprises a number of passes for verification.
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Abstract
A novel and improved method of acquisition in a spread spectrum communication system is presented. In the present invention, a large window of PN chip offset hypotheses are searched and if an energy signal is found that might indicate the presence of the pilot signal having one of the chip offsets of the large search window, then a search of a subset of offset hypotheses, or small window, is searched.
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Citations
12 Claims
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1. A method for determining a synchronized PN sequence, comprising the steps of:
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demodulating a received signal by a first plurality of PN sequences of a first set of windows of PN sequences determined in accordance with a first window parameter format to provide a first set of demodulation metrics; analyzing said first set of demodulation metrics to determine whether said synchronized PN sequence is of said first plurality of PN sequences; and demodulating said received signal by a second plurality of PN sequences of a second set of windows of PN sequences determined in accordance with a second window parameter format to provide a second set of demodulation metrics; wherein said first window parameter format further comprises a number of passes for verification. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An apparatus for determining a synchronized PN sequence, comprising:
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demodulator means for demodulating a received signal by a first plurality of PN sequences of a first set of windows of PN sequences determined in accordance with a first window parameter format to provide a first set of demodulation metrics; and analysis means for analyzing said first set of demodulation metrics to determine whether said synchronized PN sequence is of said first plurality of PN sequences; wherein said demodulator means is further for demodulating said received signal by a second plurality of PN sequences of a second set of windows of PN sequences determined in accordance with a second window parameter format to provide a second set of demodulation metrics; wherein said first window parameter format further comprises a number of passes for verification. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification