公开(公告)号：DE69133394D1

公开(公告)日：2004-07-15

申请号：DE69133394

申请日：1991-06-21

Applicant: QUALCOMM INC

Inventor： GILHOUSEN KLEIN S ,  WEAVER JR ,  JACOBS IRWIN M ,  WHEATLEY III ,  PADOVANI ROBERTO ,  VITERBI ANDREW J

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

Abstract: A cell site, comprising: means for modulating configured to format digital data for transmission on a communications channel and to insert at least one timing command into the digital data, the digital data comprising a plurality of bits; means for transmitting coupled to the means for modulating and configured to receive the digital data from the means for modulating, convert the digital data to analog data, and transmit the analog data on the communications channel; and means for receiving configured to receive a signal from at least one remote unit and to determine a timing error of the received signal to be used to generate the timing command in accordance with the timing error, the means for receiving being coupled to the means for modulating and configured to provide the timing command to the means for modulating.

公开(公告)号：RO118688B1

公开(公告)日：2003-08-29

申请号：RO9201620

申请日：1991-06-21

Applicant: QUALCOMM INC

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

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

Abstract: The invention relates to a system and a method for signal modulation in a spread spectrum communication system. Pseudo-noise sequences (PN) are generated by employing spread spectrum communication techniques, thereby creating orthogonality between the users, so that mutual interference is reduced, allowing a higher transmission capacity and better performance of the communication link. Using orthogonal PN codes, the cross-correlation is zero over a predetermined time interval, resulting in the lack of interference between the orthogonal codes, only the time synchronization of the time frames of the codes being required. In a specific embodiment, signals are transmitted between a cell-site (12 and 14) and mobile telephone units (16 and 18) using direct sequence spread spectrum communication signals. Pilot-, synchronization-, paging- and voice-channels are defined in a cell-to-mobile unit transmission link. The information communicated through the communication link channels, from the cell to the mobile telephone unit is generally encoded, interleaved and bi-phased shift (BPSK) modulated with orthogonal covering of each BPSK symbol but with quadrature phase shift (QPSK) modulation, for spreading the covered signals. In a mobile unit-to-cell transmission link, access and voice channels are defined. The information communicated through the communication link channels, from the mobile telephone unit to the cell, is generally encoded, interleaved, with orthogonal signalling and QPSK spreading.

公开(公告)号：NO20032576D0

公开(公告)日：2003-06-06

申请号：NO20032576

申请日：2003-06-06

Applicant: QUALCOMM INC

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

IPC: H04B1/7115 ,  H04B1/707

公开(公告)号：IN189670B

公开(公告)日：2003-04-05

申请号：IN1541MA1995

申请日：1995-11-27

Applicant: QUALCOMM INC

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

IPC: H03B29/00 ,  H04L27/18

公开(公告)号：DK0536334T3

公开(公告)日：2002-09-09

申请号：DK91915727

申请日：1991-06-21

Applicant: QUALCOMM INC

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

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

Abstract: A cell site, comprising: means for modulating configured to format digital data for transmission on a communications channel and to insert at least one timing command into the digital data, the digital data comprising a plurality of bits; means for transmitting coupled to the means for modulating and configured to receive the digital data from the means for modulating, convert the digital data to analog data, and transmit the analog data on the communications channel; and means for receiving configured to receive a signal from at least one remote unit and to determine a timing error of the received signal to be used to generate the timing command in accordance with the timing error, the means for receiving being coupled to the means for modulating and configured to provide the timing command to the means for modulating.

公开(公告)号：PT98079B

公开(公告)日：1999-10-29

申请号：PT9807991

申请日：1991-06-24

Applicant: QUALCOMM INC

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

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 ,  H04B7/00

Abstract: A cell site, comprising: means for modulating configured to format digital data for transmission on a communications channel and to insert at least one timing command into the digital data, the digital data comprising a plurality of bits; means for transmitting coupled to the means for modulating and configured to receive the digital data from the means for modulating, convert the digital data to analog data, and transmit the analog data on the communications channel; and means for receiving configured to receive a signal from at least one remote unit and to determine a timing error of the received signal to be used to generate the timing command in accordance with the timing error, the means for receiving being coupled to the means for modulating and configured to provide the timing command to the means for modulating.

公开(公告)号：SG48270A1

公开(公告)日：1998-04-17

申请号：SG1996008554

申请日：1988-12-21

Applicant: QUALCOMM INC

Inventor： ANTONIA FRANKLIN P ,  JACOBS IRWIN M ,  GILHOUSEN KLEIN S ,  WEAVER LINDSAY A JR

IPC: G02B6/293 ,  G02B6/34 ,  G02B6/42 ,  H01S3/08 ,  H01S5/14 ,  H01S5/40 ,  H04B1/7136 ,  H04B7/212 ,  H04B10/155 ,  H04L5/16 ,  H04B7/26 ,  H04J3/26

Abstract: A message communication system employing one or more centralized communication stations transferring messages through Earth orbit repeater satellites to or from mobile terminals with at least one central communication station having a first transceiver for transmitting a first communication signal to one or more mobile terminals and at least one mobile terminal having a second transceiver for receiving the first communication signal and demodulating it, and for transmitting at a predetermined duty cycle of the second transceiver, a second communication signal to at least one of the central communication stations. The preferred duty cycle over which the second communication signal is transmitted is about fifty percent of the second transceiver duty cycle. The communication system uses Time Division Multiplexed (TDM) communication signals using a number of channels as designated address channels with the remainder being used for data transfer. Information transmitted on the address channels is used by terminals to determine both the presence of a message and its corresponding data transmission or reception channel. In addition the terminals use the reception of the first communication signal to adjust return link transmission frequency to compensate for transmission path errors. The alternating duty cycle allows mobile terminals to use a single set of local oscillators for both transmission and reception modes of operation. To decrease interference with other systems the present system employs a power dispersal modulation function to achieve the footprint of a video signal for high transfer rate digital communication signals.

公开(公告)号：IN179893B

公开(公告)日：1997-12-27

申请号：IN479MA1991

申请日：1991-06-25

Applicant: QUALCOMM INC

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

IPC: H03B29/00 ,  H04L27/18

公开(公告)号：BG61514B1

公开(公告)日：1997-10-31

申请号：BG9722292

申请日：1992-12-22

Applicant: QUALCOMM INC

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

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

Abstract: The system and method are applicable in information signals using connection means by distributed spectrum. Pseudonoise series are generated in order to ensure orthogonality between the users so that total mutual interferences will be reduced which guarantees high capacities and improved connections. By means of the orthogonal pseudonoise codes mutual correlation is zero for a preset time interval as a result of which there is no interference between the orthogonal codes. In an alternative, series of signals of distributed spectrum are fed for which a control, synchronization and speech chanels are designed.

公开(公告)号：DE3751232T2

公开(公告)日：1995-08-24

申请号：DE3751232

申请日：1987-10-15

Applicant: QUALCOMM INC

Inventor： GILHOUSEN KLEIN S ,  JACOBS IRWIN M ,  WEAVER LINDSAY A

IPC: H04J13/00 ,  H04B7/15 ,  H04B7/216 ,  H04B7/26 ,  H04B7/185