Use of correlation combination to achieve channel detection
First Claim
1. A method of detecting a received coded signal in a receiver wherein the code applied to the received coded signal includes a lower rate code comprising at least two code sequences of a higher rate code, the method comprising:
- correlating the received coded signal at the receiver with the higher rate code to provide a higher rate code correlation result;
correlating the higher rate code correlation results with a first lower rate code to provide a first lower rate code correlation result;
correlating the higher rate code correlation results with a second lower rate code to provide a second lower rate code correlation result; and
comparing the first lower rate code correlation result to the second lower rate code correlation result to determine the presence of a signal indication.
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Accused Products
Abstract
Combinations of correlation results are used to achieve detection of multiple coded signals at a receiver in a wireless communications system. The code applied to signals includes a lower rate code and a higher rate code. The lower rate code is a nested or tiered code such that it comprises at least two code sequences of the higher rate code. The received coded signal is correlated with the higher rate code using a single higher rate correlator to provide a higher rate code correlation result. The higher rate code correlation results are fed to two or more lower rate code correlators that combine multiple higher rate code correlation results, each using a different lower rate code, to provide corresponding lower rate code correlation results. The presence of at least one coded signal or mutually exclusive coded signals can be determined from the lower rate code correlation results.
106 Citations
38 Claims
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1. A method of detecting a received coded signal in a receiver wherein the code applied to the received coded signal includes a lower rate code comprising at least two code sequences of a higher rate code, the method comprising:
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correlating the received coded signal at the receiver with the higher rate code to provide a higher rate code correlation result; correlating the higher rate code correlation results with a first lower rate code to provide a first lower rate code correlation result; correlating the higher rate code correlation results with a second lower rate code to provide a second lower rate code correlation result; and comparing the first lower rate code correlation result to the second lower rate code correlation result to determine the presence of a signal indication. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of detecting a received coded signal in a receiver wherein a code applied to the received coded signal includes a lower rate code comprising at least two code sequences of a higher rate code, the method comprising:
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demodulating the received coded signal at the receiver into in-phase and quadrature components; correlating the in-phase and quadrature components with the higher rate code to provide higher rate code correlation results; correlating higher rate code correlation results with a first lower rate code to provide a first lower rate code correlation result; correlating higher rate code correlation results with a second lower rate code to provide a second lower rate code correlation result; and comparing the first lower rate correlation result to the second lower rate code correlation result to determine the presence of a signal indication. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38)
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Specification