24/06/2005 - Controller General of Patents, Designs, and Trade Marks

(21) Application No. 3814/DEL/1997 A (22) Date of filing of Application: 29/12/1997
(54) Title of the invention: “A METHOD FOR DEMODULATING A CODE DIVISION
MULTIPLE ACCESS (CDMA) SIGNAL IN A
(51) International Classification 7 : H 04B 7/216
(30) Priority Data:
(31) Document No.: 08/778,430
(32) Date: 02/01/1997
(33) Name of convention country: USA
(66) Filed U/s 5(2): NIL
(61) Patent of addition to application No.: NA
(62) Filed on: NA
(63) Divisional to Application No.: NIL
(64) Filed on: NA
Total No Of Pages: 28
(57) Abstract:
COMMUNICATION SYSTEM.”
(71) Name of the applicant:
MOTOROLA INC.
Address of the Applicant:
1303 East Algonquin Road, Schaumburg,
IIIinois, 60196, United States of America.
(72) Name of the Inventor:
GREGORY PETER SPOCK
In a code division multiple access (CDMA) signal demodulator in a communication system (50),
samples of a CDMA signal are stored in a sample buffer (52). A plurality of the samples that
represent a plurality of chips of a symbol are then recalled from the sample buffer (52). Thereafter,
the plurality of samples are demodulated in parallel (56) using a selected user code (68) to produce
at least a portion of a user’s symbol in the code division multiple access signal. Signals from
multiple users (22, 24) having multiple fingers are demodulated by sharing the resources of a
parallel demodulator (56). Signal searching may use the same parallel demodulator (56). Fingers
for multiple users may be dynamically allocated and relocated according to the needs of each
user’s signal and the total demodulation resources available.
18189