公开(公告)号：ZA9104847B

公开(公告)日：1992-04-29

申请号：ZA9104847

申请日：1991-06-24

Applicant: QUALCOMM INC

Inventor： GILHOUSEN KLEIN S ,  KLEIN S GILHOUSEN ,  PADOVANI IRWIN M JACOBS ROBERT ,  IRWIN M JACOBS ROBERTO PADOVAN ,  WEAVER LINDSAY A JR ,  LINDSAY A WEAVER JR ,  WHEATLEY CHARLES E III ,  CHARLES E WHEATLEY III ,  VITERBI ANDREW J ,  ANDREW J VITERBI

IPC: H04B1/707 ,  H04B1/7075 ,  H04B1/709 ,  H04B1/7115 ,  H04B7/005 ,  H04B7/26 ,  H04J3/02 ,  H04J3/16 ,  H04J3/22 ,  H04J11/00 ,  H04J13/00 ,  H04J13/10 ,  H04J13/18 ,  H04L20060101 ,  H04L1/00 ,  H04L1/06 ,  H04L1/08 ,  H04L5/02 ,  H04L5/12 ,  H04L23/02 ,  H04L27/30 ,  H04W52/26 ,  H04M ,  H04J ,  H04B

CPC classification number: H04L1/0002 ,  H04B1/3888 ,  H04B1/707 ,  H04B1/70757 ,  H04B1/709 ,  H04B1/7115 ,  H04B7/2618 ,  H04B7/2628 ,  H04B7/2637 ,  H04B2201/70701 ,  H04B2201/70703 ,  H04J13/0022 ,  H04J13/0048 ,  H04J13/10 ,  H04J13/107 ,  H04J13/18 ,  H04L1/0006 ,  H04L1/0046 ,  H04L1/0065 ,  H04L1/0068 ,  H04L1/0071 ,  H04L1/06 ,  H04L1/08 ,  H04L5/02 ,  H04L5/12 ,  H04L23/02 ,  H04W52/26 ,  Y02D50/10

Abstract: 1. A modulation system for use in spread spectrum communications, comprising: means for generating a first orthogonal sequence signal corresponding to a selected one of a plurality of orthogonal binary sequences; means for generating a pseudo-noise (PN) signal corresponding to a predetermined PN binary sequence; means for combining said first orthogonal sequence signal and said PN signal and for providing a resultant first modulation signal. 2. The system of 1 further comprising additional means for combining said first modulation signal with an input information signal and for providing a resultant spread spectrum information signal. 3. The system of 1 wherein said plurality of orthogonal binary sequences are Walsh sequences. 4. The system of 1 wherein said PN sequence is an augmented length maximal linear sequence PN code.

公开(公告)号：ZA908857B

公开(公告)日：1991-08-28

申请号：ZA908857

申请日：1990-11-05

Applicant: QUALCOMM INC

Inventor： GILHOUSEN KLEIN S ,  KLEIN S GILHOUSEN ,  PADOVANI ROBERTO ,  ROBERTO PADOVANI ,  WHEATLEY CHARLES E III ,  CHARLES E WHEATLEY III

IPC: H04B1/707 ,  H04W36/18 ,  H04J ,  H04M ,  H04B

Abstract: In a cellular telephone system a system for directing communications between a mobile user and cell-sites as a mobile user changes cell-site service areas. The mobile user includes an apparatus for, while in communication with another system user via one cell-site, determining a transition of the mobile user from the cell-site service area to the service area of another cell-site. The system includes circuitry responsive to the indication for coupling communications between the mobile user and the other system user via the new cell-site while the mobile user also remains in communication with the system user via the first cell-site. The system further includes apparatus responsive to the coupling of the communications between the mobile user and the other system user via the new cell-site for terminating the communications between the mobile user and another system user via cell-site with communications continuing between the mobile user and the system user via the new cell-site.

公开(公告)号：ZA908856B

公开(公告)日：1991-08-28

申请号：ZA908856

申请日：1990-11-05

Applicant: QUALCOMM INC

Inventor： GILHOUSEN KLEIN S ,  KLEIN S GILHOUSEN ,  PADOVANI ROBERTO ,  ROBERTO PADOVANI ,  WHEATLEY CHARLES E III ,  CHARLES E WHEATLEY III

IPC: H04B1/7115 ,  H04B1/712 ,  H04B7/08 ,  H04B7/26 ,  H04L1/06 ,  H04Q7/30 ,  H04J ,  H04M ,  G01R ,  G08C

Abstract: A spread spectrum receiver subsystem for utilization in a CDMA cellular telephone having a searcher receiver for scanning the time domain so as to use the PN processing gain and time discrimination properties of spread spectrum coding to determine the location in the time domain and the received signal strength of multiple receptions of a pilot signal traveling upon one or more physical propagation paths to reception. The searcher receiver provides a control signal indicative of the received pilot signals of greatest strength and corresponding time relationship. A data receiver receives spread spectrum communication signals accompanying each received pilot signal and is responsive to the searcher control signal for acquiring and demodulating a spread spectrum communication signal, concomitant with the pilot signal of greatest signal strength, and thus providing a corresponding information bearing encoded output signal.