Use of correlation combination to achieve channel detection
First Claim
1. A method for use in wireless communications, the method comprising:
- receiving a message in a time slot;
decoding the received message byperforming a plurality of correlations involving higher and lower rate codes and a received coded signal, wherein at least one lower rate code includes at least two code sequences of a higher rate code, andcomparing results of the plurality of correlations to determine presence of a signal indication; and
performing synchronization with an access unit based on the decoded received message.
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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.
47 Citations
25 Claims
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1. A method for use in wireless communications, the method comprising:
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receiving a message in a time slot; decoding the received message by performing a plurality of correlations involving higher and lower rate codes and a received coded signal, wherein at least one lower rate code includes at least two code sequences of a higher rate code, and comparing results of the plurality of correlations to determine presence of a signal indication; and performing synchronization with an access unit based on the decoded received message. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A mobile wireless device comprising:
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a receiver to receive a coded signal, 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; one or more correlators coupled with the receiver to perform a plurality of correlations involving higher and lower rate codes and the received coded signal, wherein at least one lower rate code includes at least two code sequences of a higher rate code; and a comparator coupled with the one or more correlators to compare results of the plurality of correlations to determine presence of a signal indication. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification