公开(公告)号：FI970276A0

公开(公告)日：1997-01-23

申请号：FI970276

申请日：1997-01-23

Applicant: INTERDIGITAL TECH CORP

Inventor： SCHILLING DONALD L ,  KOWALSKI JOHN ,  MOSHAVI SHIMON

IPC: H04B1/10 ,  H04B1/12 ,  H04B1/707 ,  H04B1/709 ,  H04B1/7093 ,  H04B1/7107 ,  H04B7/216 ,  H04L7/00 ,  H04B

公开(公告)号：CA2569056A1

公开(公告)日：1994-04-07

申请号：CA2569056

申请日：1993-10-06

Applicant: INTERDIGITAL TECH CORP

Inventor： SCHILLING DONALD L

IPC: H04W8/20 ,  G06Q20/32 ,  H04B1/69 ,  H04W92/08

公开(公告)号：CA2356150A1

公开(公告)日：1994-04-07

申请号：CA2356150

申请日：1993-10-06

Applicant: INTERDIGITAL TECH CORP

Inventor： SCHILLING DONALD L

IPC: H04B7/00 ,  H04Q7/32

Abstract: A wireless debit card communications system comprising a radio unit, a base station, and an end station. The radio unit, for example, a radio telephone, includes a first processor, a reader for reading a credit amount and a personal access number from a debit card, and a transceiver for communicating, using radio waves, a credit signal. The base station receives and relays the credit signal over a communications channel to the end station. The end station includes a switch to generate a first control signal to allocate the credit amount of the debit card to the radio unit, and to set a radio unit access number of the radio unit to the personal access number of the debit card with a communications path through the base station. The end station also generates a second control signal for changing the credit amount and the personal access number of the debit card. The base station may be connected to a debit meter. The radio unit and the debit meter respond to the second control signal to change the credit amount and the personal access number using magnetic writers or writer processors to store an updated credit amount and personal access number on a magnetic strip on a debit card or on a chip on the debit card as the debit card is used in the radio unit. The personal access number may be used as a telephone number of the radio unit.

公开(公告)号：CA2616764A1

公开(公告)日：1993-05-27

申请号：CA2616764

申请日：1992-11-18

Applicant: INTERDIGITAL TECH CORP

Inventor： SCHILLING DONALD L

IPC: H04B1/707 ,  H04B7/005 ,  H04W52/14 ,  H04W52/22 ,  H04W52/24 ,  H04W52/52

Abstract: An apparatus for adaptive-power control of a spread-spectrum transmitter of a mobile station operating in a cellular-communications network using spread-spectrum modulation. A base station transmits a first spread-spectrum signal. A mobile station has an automatic-gain-control circuit for generating an AGC-output signal, from a received signal. The received signal includes the first spread-spectrum signal and an interfering signal. The mobile station also has a correlator for despreading the AGC-output signal, a power-measurement circuit responsive to processing the received signal with the despread AGC-output signal for generating a received-power level, a comparator coupled to the power-measurement circuit for generating a comparison signal by comparing the received-power level to a threshold level, a transmitter for transmitting a second spread-spectrum signal, an antenna, and a variable-gain device responsive to the comparison signal for adjusting a transmitter-power level of the second spread-spectrum signal.

公开(公告)号：CA2679170A1

公开(公告)日：1992-06-15

申请号：CA2679170

申请日：1991-12-10

Applicant: INTERDIGITAL TECH CORP

Inventor： SCHILLING DONALD L

IPC: G01S5/00 ,  G01S5/14 ,  G01S13/82 ,  G01S19/22 ,  H04B1/707 ,  H04B7/005 ,  H04B7/185 ,  H04J13/00

Abstract: A spread spectrum communications system for use over a communications channel, including a transmitter-generic-chip-code generator, a transmitter-message-chip-code generator, an EXCLUSIVE-OR gate, a combiner, a transmitter, a receiver-generic-chip-code generator, a receiver-generic mixer, a generic-bandpass filter, a receiver-message-chip-code generator, a receiver-message mixer, a message-bandpass filter, and a synchronous detector. The transmitter-generic-chip-code generator generates a generic-chip-code signal and the transmitter-message-chip-code generator generates a message-chip-code signal. The EXCLUSIVE-OR gate spread-spectrum processes message data with the message-chip-code signal to generate a spread-spectrum signal. The combiner combines the generic-chip-code signal with the spread-spectrum signal. The transmitter transmits the combined generic-chip-code signal and spread-spectrum signal, on a carrier signal over the communications channel as a spread-spectrum-communications signal. The receiver-generic-chip-code generator generates a replica of the generic-chip-code signal. The generic mixer recovers the carrier signal from the spread-spectrum-communications signal. The receiver-message-chip-code generator generates a replica of the message-chip-code signal. The receiver-message mixer despreads the spread-spectrum-communications signal as a modulated-data signal. The tracking and acquisition circuit uses the recovered carrier signal for synchronizing the replicas of the generic-chip-code signal to the recovered carrier signal. The synchronous detector synchronously demodulates the modulated-data signal as received data.

公开(公告)号：CA2354687A1

公开(公告)日：1992-06-15

申请号：CA2354687

申请日：1991-12-10

Applicant: INTERDIGITAL TECH CORP

Inventor： SCHILLING DONALD L

IPC: H04B1/69 ,  H04B7/216

Abstract: A spread spectrum communications system for use over a communication channel, including a transmitter-generic- chip-code generator (101), a transmitter-message-chip- code generator (102), an EXCLUSIVE-OR gate(103), a combiner (104), a transmitter (107), a receiver-generic- chip-code generator (121), a receiver-generic mixer (123), a generic-bandpass filter (125), a receiver- message-chip-code generator (122), a receiver-message mixer (124), a message-bandpass filter (126), and a synchronous detector (139). The transmitter-generic- chip-code generator (101) generates a generic-chip-code signal and the transmitter-message-chip-code generator (102) generates a message-chip-code signal. The EXCLUSIVE-OR gate (103) spread-spectrum process message data with the message-chip-code signal to generate a spread-spectrum signal. The transmitter (107) transmits the combined generic-chip-code signal and spread-spectrum signal, on a carrier signal (108) over the communications channel as a spread-spectrum-communications signal. The receiver-generic-chip-code generator (121) generates a replica of the generic-chip-code signal. The generic mixer (123) recovers the carrier signal from the spread- spectrum-communications signal. The receiver-message- chip-code generator (122) generates a replica of the message-chip-code signal. The receiver-message mixer (124) despreads the spread-spectrum-communications signal as a modulated-data signal. The tracking and acquisition circuit (121) uses the recovered carrier signal for synchronizing the replicas of the generic-chip-code signal to the recovered carrier signal. The synchronous detector (139) synchronously demodulates the modulated- data signal as received data.

公开(公告)号：CA2320638A1

公开(公告)日：1992-06-06

申请号：CA2320638

申请日：1991-12-03

Applicant: INTERDIGITAL TECH CORP

Inventor： SCHILLING DONALD L

IPC: H04B1/7097 ,  H04B1/69 ,  H04W80/00 ,  H04B7/216 ,  H04Q7/36

Abstract: A spread spectrum CDMA communications system for communicating data and/or digitized voice between a plurality of users to a plurality of PCN units. The spread spectrum communications system is located within a same geographical region as occupied by an existing FDMA, proposed TDMA or any other mobile cellular system. The spread spectrum CDMA communications system includes a plurality of PCN-base stations and a plurality of PCN units. A PCN-base station has a comb filter (333) for notch filtering predetermined channels of the mobile cellular system, a device for converting the format of the data into a form suitable for communicating over radio waves, a spread spectrum modulator for spread spectrum processing the data, and a transmitter for transmitting the spread spectrum processed converted data from the PCN-base station to a PCN unit. The PCN-base station also has an antenna, and spread spectrum detectors (334) for recovering data communicated from the PCN units. A PCN nit has an antenna (330), and a detector coupled to the antenna for recovering data communicated from PCN-base station. The detector includes a spread spectrum demodulator (334). Also, the PCN unit has a device for converting the format of the data into a form suitable for communicating over radio waves, a spread spectrum modulator and a transmitter.

公开(公告)号：CA2634337A1

公开(公告)日：1992-05-17

申请号：CA2634337

申请日：1991-11-14

Applicant: INTERDIGITAL TECH CORP

Inventor： SCHILLING DONALD L

IPC: H04B1/707 ,  H04B1/7075 ,  H04B7/005 ,  H04W52/14 ,  H04W52/22 ,  H04W52/24 ,  H04W52/52

Abstract: A spread spectrum base station comprising an automatic gain control (AGC) circuit having an input configured to receive a received spread spectrum signal and gain control the received spread spectrum signal to produce a gain controlled signal; a correlation circuit having an input configured to receive the gain controlled signal and correlate the gain controlled signal with a code to produce a despread signal; a power measurement and comparator circuit configured to receive the despread signal and a control level of the AGC circuit and processing at least the despread signal and the control level to produce a processed signal and comparing the processed signal with a threshold to produce a comparison signal, the comparison signal used to produce a power command; and a multiplexer for multiplexing the power command with a signal for transmission over an antenna.

公开(公告)号：CA2634337C

公开(公告)日：2010-11-02

申请号：CA2634337

申请日：1991-11-14

Applicant: INTERDIGITAL TECH CORP

Inventor： SCHILLING DONALD L

IPC: H04W52/18 ,  H04B1/707 ,  H04B1/7075 ,  H04B7/005 ,  H04W52/14 ,  H04W52/22 ,  H04W52/24 ,  H04W52/52 ,  H04W88/02

Abstract: A spread spectrum base station comprising: an automatic gain control (AGC) circuit having an input configured to receive a received spread spectrum signal and gain control the received spread spectrum signal to produce a gain controlled signal; a correlation circuit having an input configured to receive the gain controlled signal and correlate the gain controlled signal with a code to produce a despread signal; a power measurement and comparator circuit configured to receive the despread signal and a control level of the AGC circuit and processing at least the despread signal and the control level to produce a processed signal and comparing the processed signal with a threshold to produce a comparison signal, the comparison signal used to produce a power command; and a multiplexer for multiplexing the power command with a signal for transmission over an antenna.

公开(公告)号：SE532856C2

公开(公告)日：2010-04-20

申请号：SE0702343

申请日：1995-07-05

Applicant: INTERDIGITAL TECH CORP

Inventor： SCHILLING DONALD L ,  KOWALSKI JOHN ,  MOSHAVI SHIMON

IPC: H04B1/10 ,  H04B1/12 ,  H04B1/707 ,  H04B1/709 ,  H04B1/7093 ,  H04B1/7107 ,  H04B7/216 ,  H04L7/00