| US 7,352,704 B1 | ||
| Method and apparatus for multi-path delay spread detection in wideband CDMA systems | ||
| Karim Nassiri Toussi, Belmont, Calif. (US); Rajaram Subramoniam, San Jose, Calif. (US); Huoy-Bing Lim, Saratoga, Calif. (US); and Debarag Banerjee, Sunnyvale, Calif. (US) | ||
| Assigned to National Semiconductor Corporation, Santa Clara, Calif. (US) | ||
| Filed on Aug. 29, 2003, as Appl. No. 10/651,850. | ||
| Int. Cl. H04L 12/26 (2006.01) | ||
| U.S. Cl. 370—238 [370/487] | 23 Claims |
| 1. A method for multi-path searching in a mobile device such that the mobile device detects delays and gains of different
propagation paths for a received signal, the method for the mobile device comprising:
correlating data corresponding to a first one of the propagation paths of the received signal with a conjugate of a pilot
channel sequence;
repeating the correlation for other propagation paths of the received signal, wherein the other propagation paths correspond
to a first set of propagation paths that also includes the first one of the propagation paths;
coherently accumulating results corresponding to the correlation for the first set of propagation paths;
calculating square-magnitudes of the coherently accumulated results corresponding to the first set of propagation paths; and
comparing the calculated square-magnitudes of the coherently accumulated results corresponding to the first set of propagation
paths to a threshold to identify first search results for the first set of propagation paths from the square-magnitudes of
the first set of propagation paths that surpass the threshold, wherein the first search results include corresponding delays
and gains for the first set of propagation paths.
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