Pilot strength measurement and multipath delay searcher for CDMA receiver
First Claim
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1. A method for evaluating a channel'"'"'s signal strength at a mobile station comprising the steps of:
- receiving a signal;
converting the received signal into a first sample stream according to a first sampling rate;
converting the first sample stream into a second sample stream according to a second sampling rate, wherein the second sampling rate is different than the first sampling rate;
generating a search window for the first sample stream using a sliding correlator; and
measuring the signal strength of the second sample stream using the search window.
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Abstract
A method and apparatus for evaluating signal strength of a channel received at a mobile station within a spread spectrum communication systems is disclosed. If the receiver at the mobile station receives a spread spectrum signal, a first sampling means converts the received signal into a first sample stream as a first sampling. A second sampling means converts the first sample stream into a second sample stream at a second sample rate, different from the first sample rate. The signal strength of a pilot channel is measured based upon the first and second sample streams.
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Citations
19 Claims
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1. A method for evaluating a channel'"'"'s signal strength at a mobile station comprising the steps of:
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receiving a signal; converting the received signal into a first sample stream according to a first sampling rate; converting the first sample stream into a second sample stream according to a second sampling rate, wherein the second sampling rate is different than the first sampling rate; generating a search window for the first sample stream using a sliding correlator; and measuring the signal strength of the second sample stream using the search window. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An apparatus for evaluating CDMA channel signal strength at a mobile station in a spread spectrum communications system, comprising:
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a receiver for receiving a signal; first sampling means for converting the received signal into a first sample stream according to a first sampling rate; second sampling means for converting the first sample stream into a second sample stream according to a second sampling rate, wherein the second sampling rate is different than the first sampling rate; a sliding correlator for generating a search window for the first sample stream; and a measurer for measuring the signal strength of the second sample stream using the search window.
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13. A method for evaluating CDMA channel signal strength at a mobile station comprising the steps of:
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receiving a CDMA signal; converting the received CDMA signal into a first sample stream according to a first sampling rate; converting the first sample stream into a second sample stream according to a second sampling rate, wherein the second sampling rate is lower than the first sampling rate; selecting an optimal down sampling phase for the second sample stream; generating a search window for the first sample stream using a sliding correlator; measuring the CDMA signal strength of the second sample stream using the search window. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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Specification