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    42.
    发明专利
    未知

    公开(公告)号：DE69133561T2

    公开(公告)日：2007-06-21

    申请号：DE69133561

    申请日：1991-12-03

    Applicant: INTERDIGITAL TECH CORP

    Inventor： SCHILLING DONALD L

    IPC: G01S5/00 ,  G01S5/14 ,  G01S13/82 ,  G01S19/16 ,  G01S19/48 ,  H04B1/707 ,  H04B1/71 ,  H04B7/005 ,  H04B7/185 ,  H04B7/216 ,  H04B7/26 ,  H04J13/00 ,  H04W16/02 ,  H04W52/34

    Abstract: A spread spectrum code division multiple access (CDMA) receiver for receiving data from a spread spectrum CDMA transmitter in a same geographic region as covered by a cellular system, the cellular system communicating using a plurality of predetermined frequency bandwidths, is disclosed. The receiver is characterized by means (149, 140, 147, 141, 169, 161, 163, 330, 331, 332) for receiving a spread spectrum CDMA data signal from said CDMA transmitter, the CDMA data signal having a wide bandwidth overlaying said plurality of predetermined frequency bandwidths, means (143, 333) for notch filtering the received CDMA data signal at said plurality of predetermined frequency bandwidths, and means (145, 165, 334, 335) for recovering data from said notch filtered CDMA data signal. A method of receiving data is also disclosed.

    ADAPTIVE POWER CONTROL FOR A SPREAD SPECTRUM COMMUNICATIONS SYSTEM AND METHOD
    43.
    发明专利
    ADAPTIVE POWER CONTROL FOR A SPREAD SPECTRUM COMMUNICATIONS SYSTEM AND METHOD 未知

    公开(公告)号：CA2505875C

    公开(公告)日：2007-06-05

    申请号：CA2505875

    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 and method 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.

    WIRELESS DEBIT CARD SYSTEM AND METHOD
    44.
    发明专利
    WIRELESS DEBIT CARD SYSTEM AND METHOD 未知

    公开(公告)号：CA2356150C

    公开(公告)日：2007-02-13

    申请号：CA2356150

    申请日：1993-10-06

    Applicant: INTERDIGITAL TECH CORP

    Inventor： SCHILLING DONALD L

    IPC: H04Q7/32 ,  H04B7/00

    Abstract: A wireless debit card communication system comprises a radio unit, a base station and an end station. The radio unit comprises a card reader for reading information from a card and a transceiver for transmitting a first signal including the red telephone number to a base station and for receiving calls directed to the red telephone number, whereby the first signal enables the wireless communication system to redirect calls for the red telephone number to the radio unit. Also described is a method for directing to the radio unit calls to a number carried on a card and communicated to a base station.

    47.
    发明专利
    未知

    公开(公告)号：SE525117C2

    公开(公告)日：2004-11-30

    申请号：SE0301545

    申请日：2003-05-27

    Applicant: INTERDIGITAL TECH CORP

    Inventor： SCHILLING DONALD L

    IPC: G01S3/42 ,  H01Q3/22 ,  H01Q3/38 ,  H01Q3/26 ,  H04B1/10 ,  H04B1/26 ,  H04B1/69 ,  H04B1/707 ,  H04B7/08 ,  H04B15/00 ,  H04L1/06

    Abstract: A phased array spread spectrum system for maximizing signal strength of a spread-spectrum signal with multipath through the use of a first RF/IF section 21, a second RF/IF section 22, a first digital delay device 27, a second digital delay device 28, a first summer 29, a second summer 30, a despreader 31, a magnitude device 32, a shift register 33, and a comparator 34. The first RF/IF section 21 receives a plurality of spread-spectrum signals and the second RF/IF section 22 receives a plurality of phased versions of the plurality of spread-spectrum signals. The first and second digital delay devices 27, 28 delay the received plurality of spread-spectrum signals with respect to the plurality of phased versions of the plurality of spread-spectrum signals by a plurality of delays. The first and second summers 29, 30 combine the delayed spread-spectrum signals and the plurality of phased versions of the plurality of spread-spectrum signals as a plurality of combined signals. The despreader 31 despreads the plurality of combined signals as a plurality of despread signals. The magnitude device 32 generates a plurality of magnitude values from the plurality of despread signals. The shift register 33 stores a plurality of previous-magnitude values previously generated by the magnitude device 32 and a plurality of present magnitude values presently generated by the magnitude device 32. The comparator 34 compares the previous-magnitude values and the present-magnitude values and, responsive to the comparison, outputs a plurality of comparison signals. The first and second digital delay devices 27, 28 respond to the plurality of comparison signals by lengthening or shortening the plurality of delays.

    50.
    发明专利
    未知

    公开(公告)号：FI20040598A

    公开(公告)日：2004-04-28

    申请号：FI20040598

    申请日：2004-04-28

    Applicant: INTERDIGITAL TECH CORP

    Inventor： SCHILLING DONALD L

    IPC: H04B1/707 ,  H04B1/7093 ,  H04B7/216 ,  H04B7/26 ,  H04M3/56 ,  H04W88/08

    Abstract: A communication unit for use in a spread-spectrum communication system having a plurality of the units which allow for simultaneous communication among of a plurality of active units, each communication unit comprising a command signal generator for generating a command signal; a transmitter for transmitting communication signals at one of two frequencies and for transmitting said command signal; and a receiver for receiving communication signals at one of said two frequencies and for receiving said command signal, whereby upon initiation of said command signal, said command signal is transmitted for receipt by all active units in the system and the unit transmitting said command signal receives communication signals at a selected frequency of said two frequencies and transmits communication signals at another frequency, and whereby upon reception of said command signal from another unit in the system, the unit receiving said command signal transmits a communication signal at said selected frequency of said two frequencies and receives communication signals at said another frequency.

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