公开(公告)号：BR9306032A

公开(公告)日：1997-11-18

申请号：BR9306032

申请日：1993-03-04

Applicant: QUALCOMM INC

Inventor： TIEDERMANN EDWARD G JR ,  WEAVER LINDSAY A ,  PADOVANI ROBERTO

IPC: H04B1/707 ,  H04B1/7103 ,  H04B7/26 ,  H04J13/00 ,  H04J13/10 ,  H04J13/16 ,  H04L1/16 ,  H04L12/28 ,  H04L12/403 ,  H04L12/413 ,  H04L27/30 ,  H04W28/04 ,  H04W52/48 ,  H04W52/50 ,  H04W74/00 ,  H04W74/08

Abstract: Collisions between messages simultaneously transmitted by multiple spread spectrum transmitters are reduced by distributing the transmissions over the available resources of the receiver. Each mobile station uses one or more randomization methods to distribute its transmissions. Each mobile station includes a microprocessor (100); an encoder (140); a timing generator (136); a PN long code sequence generator (146); and XOR gate (152). The system is used in a CDMA mobile telephone system.

公开(公告)号：ID27751A

公开(公告)日：2001-04-26

申请号：ID20001381

申请日：1999-01-15

Applicant: QUALCOMM INC

Inventor： WHEATLEY CHARLES E III ,  TIEDERMANN EDWARD G JR

IPC: H04W56/00 ,  H04B1/707 ,  H04B1/7075 ,  H04B1/7077 ,  H04B7/26 ,  H04J3/06 ,  H04J13/00

Abstract: In the present invention, the slave base station attains synchronization with the reference base station through messages transmitted from and received by a mobile station either in the soft handoff region between the reference base station and the slave base station or within a range which allows the mobile station to communicate with the slave base station. When the mobile station is not in communication with both the reference base station and the slave base station, then the round trip delay between the mobile station and the reference base station is measured by the reference base station. The reference base station communicates the PN code used by the mobile station over the reverse link to the slave base station. The slave base station acquires the signal from the mobile station and determines when the signal from the mobile station arrives. The slave base station then makes and estimates as to the length of the delay between transmission of a signal from the mobile station to the slave base station. Based upon these measurements and estimates, the slave base station determines the error which is present in the slave base station system time.

公开(公告)号：BR9709612A

公开(公告)日：1999-08-10

申请号：BR9709612

申请日：1997-05-28

Applicant: QUALCOMM INC

Inventor： TIEDERMANN EDWARD G JR ,  JOU YU-CHEUN ,  ODEWALDER JOSEPH P

IPC: H04B1/707 ,  H04B7/24 ,  H04B7/26 ,  H04J13/00 ,  H04J13/18 ,  H04L1/00

Abstract: A method for demodulating a received signal comprising complex multiplying (202,204) the received signal by a complex pseudonoise code to produce a complex pseudonoise despread signal (XI,XQ); filtering (214) the complex pseudonoise despread signal to provide a complex filtered pilot signal; multiplying (210) the complex pseudo-noise despread signal by a first demodulation code to provide a first complex demodulated data signal; and phase rotating and scaling (216,218) the first complex demodulated clara signal in accordance with the complex-filtered pilot signal to provide a first soft decision data.