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公开(公告)号：DE1033840T1
公开(公告)日：2001-02-08
申请号：DE00104576
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 , H04J13/02
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公开(公告)号：HK1026801A1
公开(公告)日：2000-12-22
申请号：HK00105938
申请日：2000-09-20
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.
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公开(公告)号：IN185110B
公开(公告)日：2000-11-18
申请号：IN1140CA1998
申请日：1998-06-29
Applicant: INTERDIGITAL TECH CORP
Inventor： SCHILLING DONALD L
IPC: H04L5/00
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公开(公告)号：ES2137911T1
公开(公告)日：2000-01-01
申请号：ES98100395
申请日：1991-11-14
Applicant: INTERDIGITAL TECH CORP
Inventor： SCHILLING DONALD L
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.
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公开(公告)号：ES2118811T4
公开(公告)日：1999-11-01
申请号：ES92903696
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 , H04K1/00
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.
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Patent Agency Ranking
公开(公告)号：DE69129936T2
公开(公告)日：1999-04-22
申请号：DE69129936
申请日：1991-11-14
Applicant: INTERDIGITAL TECH CORP
Inventor： SCHILLING DONALD L
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.
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公开(公告)号：DE19581690T1
公开(公告)日：1999-03-11
申请号：DE19581690
申请日：1995-06-16
Applicant: INTERDIGITAL TECH CORP
Inventor： SCHILLING DONALD L
IPC: H04B1/707 , H04B1/7093 , H04B7/216 , H04B7/26 , H04M3/56 , H04W88/08 , H04B1/69 , H04Q11/04 , H04L12/18
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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公开(公告)号：ES2121842T3
公开(公告)日：1998-12-16
申请号：ES92900991
申请日：1991-11-14
Applicant: INTERDIGITAL TECH CORP
Inventor： SCHILLING DONALD L
IPC: H04B1/709 , H04B1/7113 , H04B1/7117 , H04B1/66
Abstract: An apparatus for adapting to receive a particular path, having the greatest amplitude, of a spread-spectrum signal with multipath. The spread-spectrum signal is modulated by a chip-code. A chip-code generator generates a chip-code signal having the same chip-code as the spread-spectrum signal. A plurality of shift registers shift the chip-code signal by a plurality of time delays. First and second ring counters generate first and second sequencing signals for controlling first and second switching devices. The first switching device successively switches between a plurality of taps of the shift registers in a direction of increasing or decreasing delays for generating the chip-code signal with the first time delay. The second switching device successively switches between the plurality of taps of the shift registers in a direction of increasing or decreasing delays for generating the chip-code signal with a second time delay. A first correlator correlates the spread-spectrum signal received at the input with the chip-code signal with the first time delay. A second correlator correlates the spread-spectrum signal received at the input with the chip-code signal with the second time delay. A comparator generates first and second comparator signals by comparing the outputs of the first correlator and the second correlator.
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公开(公告)号：DE69129936D1
公开(公告)日：1998-09-10
申请号：DE69129936
申请日：1991-11-14
Applicant: INTERDIGITAL TECH CORP
Inventor： SCHILLING DONALD L
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.
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公开(公告)号：CA2552443A1
公开(公告)日：1996-02-08
申请号：CA2552443
申请日：1995-07-05
Applicant: INTERDIGITAL TECH CORP
Inventor： MOSHAVI SHIMON , KOWALSKI JOHN , SCHILLING DONALD L
IPC: H04B1/10 , H04B1/12 , H04B1/707 , H04B1/709 , H04B1/7093 , H04B1/7107 , H04B7/216 , H04L7/00
Abstract: A plurality of channels are received as a received signal. Each channel is associated with a code. For each of the plurality of channels, others of the plurality of channels are subtracted from the received signal and a result of that subtracting is despread as data for that channel.
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