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(12) INTERNATIONAL APPLICATION PUBLISHED UNDER THE PATENT COOPERATION TREATY (PCT)
(11) WO 02/096049
 
(13) A1
(21) PCT/RU01/00187
(22) 23 May 2001 (23.05.2001)
(25) English
(26) English
 
(43) 28 November 2002 (28.11.2002)
(51)7 H04L 25/02
(54) CHANNEL ESTIMATION IN CDMA COMMUNICATIONS SYSTEMS USING BOTH LOWER POWER PILOT CHANNEL AND HIGHER POWER DATE CHANNEL
(71) NORTEL NETWORKS LIMITED [CA/CA]; 2351 Boulevard Alfred-Nobel, St. Laurent, Quebec H4S 2A9 (CA). WANG, Chao (legal representative of the deceased inventor) [CA/CA]; 1204-900 Dynes Road, Ottawa, Ontario K2C 3L6 (CA).
(72) WANG, Rui (deceased) ;
(72)
(75)
EL-TARKHUNI, Mohamed [AE/AE]; c/o American University of Sharjah, P.O. Box 26666, Sharjah (AE). DING, Zhi [US/US]; 15 Carlsbad Place, Iowa City, IA 52246 (US). SHINAKOV, Yury S. [RU/RU]; ul. Vilnusskaja, 7-2-125, Moscow, 117574 (RU). CHLOMA, Alexandre M. [RU/RU]; ul. Gagavina, 63-27, Zhukovsky, Moskovskaya obl., 140160 (RU). BAKOULINE, Mikhail G. [RU/RU]; ul. Kirova, 35-31, Podolsk, Moskovskaya obl., 142110 (RU). KREINDELINE, Vitali B. [RU/RU]; ul. Grajvoronosvkaya, 8-1-87, Moscow, 109518 (RU).
(74) KLIUKIN, Viacheslav Alexandrovich; Gowlings International Inc., Prechistensky pereulok 14, Building 1, 4th Floor, Moscow, 119034 (RU).
(81) AE, AG, AL, AM, AT, AU, AZ, BA, BB, BG, BR, BY, BZ, CA, CH, CN, CO, CR, CU, CZ, DE, DK, DM, DZ, EC, EE, ES, FI, GB, GD, GE, GH, GM, HR, HU, ID, IL, IN, IS, JP, KE, KG, KP, KR, KZ, LC, LK, LR, LS, LT, LU, LV, MA, MD, MG, MK, MN, MW, MX, MZ, NO, NZ, PL, PT, RO, RU, SD, SE, SG, SI, SK, SL, TJ, TM, TR, TT, TZ, UA, UG, US, UZ, VN, YU, ZA, ZW
(84) ARIPO patent (GH, GM, KE, LS, MW, MZ, SD, SL, SZ, TZ, UG, ZW), Eurasian patent (AM, AZ, BY, KG, KZ, MD, RU, TJ, TM), European patent (AT, BE, CH, CY, DE, DK, ES, FI, FR, GB, GR, IE, IT, LU, MC, NL, PT, SE, TR), OAPI patent (BF, BJ, CF, CG, CI, CM, GA, GN, GW, ML, MR, NE, SN, TD, TG)
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(57) An iterative arrangement of channel estimator (12), a Kalman filter unit (14), and a soft demodulator (16) is provided for producing an estimate of complex gain of a CDMA communications channel carrying data and pilot channels, and demodulated data of the data channel. An initial channel estimate is produced by the etimator (12) using only the low-power pilot channel. This later is improved by the iterative process using the data channel. The complex gains is represented by a sum of sinusoidal signals with different frequencies and randomly variable amplitude and phase.