The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 09, 2004
Filed:
Jun. 29, 2000
Masahiro Komatsu, Tokyo, JP;
NEC Corporation, , JP;
Abstract
A direct sequence CDMA receiver is disclosed that includes an interpolative delay profile production unit. An A/D converter receives signals that have been received by an antenna and converted to a baseband signal and samples the signals at twice the chip rate. A matched filter finds correlation values with the received data using a spreading code of 1/−1, and the delay profile production means interpolates these correlation values by means of, for example, a filter. A timing detector selects delay profiles in descending order of size, and extracts the timings of each. A despreader interpolates the spreading code to synchronize with the timing signals, and using these interpolated values carries out despreading of the received data. A mixer carries out RAKE/diversity mixing of the despread signals.