Code sequence generator in a CDMA modem

Details Code sequence generator in a CDMA modem Code sequence generator in a CDMA modem

1996-06-27

1998-08-18

Chin, Stephen

Pulse or digital communications

Transceivers

Modems

375206, 36471704, 36471705, 36471707, 380 46, G06F 102, H04L 2720

Patent

active

057967768

ABSTRACT:
A CDMA modem includes a modem transmitter having: a code generator which provides an associated pilot code signal and which generates a plurality of message code signals; a spreading circuit which produces a spread-spectrum message signal by combining each of the information signals with a respective one of the message code signals; and a global pilot code generator that provides a global pilot code signal to which the message code signals are synchronized. The CDMA modem also includes a modem receiver having an associated pilot code generator and a group of associated pilot code correlators for correlating code-phase delayed versions of the associated pilot signal with a receive CDM signal to produce a despread associated pilot signal. The code phase of the associated pilot signal is changed responsive to an acquisition signal value until a pilot signal is received. The associated pilot code tracking logic adjusts the associated pilot code signal in phase responsive to the acquisition signal so that the signal power level of the despread associated pilot code signal is maximized. Finally, the CDMA modem receiver includes a group of message signal acquisition circuits, each including a plurality of receive message signal correlators which correlate respective local received message code signal to the CDM signal to produce a respective despread received message signal.

REFERENCES:
patent: 4901307 (1990-02-01), Gilhousen et al.
patent: 5022049 (1991-06-01), Abrahamson et al.
patent: 5084900 (1992-01-01), Taylor
patent: 5093840 (1992-03-01), Schilling
patent: 5103459 (1992-04-01), Gilhousen et al.
patent: 5109390 (1992-04-01), Gilhousen et al.
patent: 5166951 (1992-11-01), Schilling
patent: 5193094 (1993-03-01), Viterbi
patent: 5204876 (1993-04-01), Bruckert et al.
patent: 5228054 (1993-07-01), Rueth et al.
patent: 5228056 (1993-07-01), Schilling
patent: 5237586 (1993-08-01), Bottomley
patent: 5241690 (1993-08-01), Larsson et al.
patent: 5245629 (1993-09-01), Hall
patent: 5253268 (1993-10-01), Omura et al.
patent: 5257283 (1993-10-01), Gilhousen et al.
patent: 5260967 (1993-11-01), Schilling
patent: 5265119 (1993-11-01), Gilhoussen et al.
patent: 5267262 (1993-11-01), Wheatley, III
patent: 5283536 (1994-02-01), Wheatley, III et al.
patent: 5295152 (1994-03-01), Gudmundson et al.
patent: 5299226 (1994-03-01), Schilling
patent: 5299228 (1994-03-01), Hall
patent: 5309474 (1994-05-01), Gilhousen et al.
patent: 5327455 (1994-07-01), DeGaudenzi et al.
patent: 5327467 (1994-07-01), DeGaudenzi et al.
patent: 5341396 (1994-08-01), Higgins
patent: 5345598 (1994-09-01), Dent
patent: 5347536 (1994-09-01), Meehan
patent: 5349606 (1994-09-01), Lovell et al.
patent: 5373502 (1994-12-01), Turban
patent: 5377183 (1994-12-01), Dent
patent: 5392287 (1995-02-01), Tiedemann, Jr. et al.
patent: 5396516 (1995-03-01), Padovani et al.
patent: 5404376 (1995-04-01), Dent
patent: 5414728 (1995-05-01), Zehavi
patent: 5414729 (1995-05-01), Fenton
patent: 5416797 (1995-05-01), Gilhousen et al.
patent: 5420896 (1995-05-01), Schilling
patent: 5430760 (1995-07-01), Dent
patent: 5440597 (1995-08-01), Chung et al.
patent: 5442662 (1995-08-01), Fukasawa et al.
patent: 5446683 (1995-08-01), Mullen et al.
patent: 5488629 (1996-01-01), Takahashi et al.
patent: 5519736 (1996-05-01), Ishida
patent: 5559790 (1996-09-01), Yano et al.
Search Report, Apr. 10, 1997.
Search Report, Apr. 15, 1997.
Search Report, Apr. 17, 1997.
Search Report, Apr. 29, 1997.
Search Report, Mar. 5, 1997.
"Code Division Multiple Access (CDMA)", Franz Josef Hagmanns, Volker Hespelt, 8273 ANT Nachrichtentechnische Berichte (1993) Aug., No. 10, Backnang, DE, pp. 64-71.
"CDMA and ATM-zwei Technologien, ein Ziel", 2323 Telcom Report (Siemens) 18(1995) Maerz/Apr., No. 2, Munchen, DE, pp. 60-63.
Raymond W. Nettleton, "Spectral Efficiency in Cellular Land-Mobile Communications: A Spread-Spectum Approach," UMI Dissertation Information Service (1978) 204 pp.
Hossein Al Avi, "Power Control and Interference Management in a Spread-Spectrum Cellular Mobile Radio System," UMI Dissertation Information Services, (1984). 129 pp.
International Search Report, Jan. 14, 1997.

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