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公开(公告)号：CA2369499A1
公开(公告)日：1996-02-08
申请号：CA2369499
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 , H04B1/69
Abstract: A spread-spectrum CDMA interference canceler for reducing interference in a DS/CDMA receiver having N chip-code channels. The interference canceler includes a plurality of correlators, a plurality of spread-spectrum-processi ng circuits, subtracting circuits, and channel correlators. Using a plurality o f chip- code signals generated from chip codeword signal generators, the correlators despreads the spread-spectrum CDMA signal as a plurality of despread signals . The plurality of spread-spectrum-processing circuits uses a timed version of the plurality of chip-code signals generated from the delay devices, for spread- spectrum processing the plurality of despread signals. For recovering a code channel using an i th chip-code-signal, the subtracting circuits subtracts from the spread-spectrum CDMA signal, each of the N-1 spread-spectrum-processed- despread signals thereby generating a subtracted signal. The channel- correlator despreads the subtracted signal.
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公开(公告)号：AU3094295A
公开(公告)日：1996-01-25
申请号：AU3094295
申请日：1995-06-16
Applicant: INTERDIGITAL TECH CORP
Inventor： SCHILLING DONALD L
IPC: H01Q3/38 , G01S3/42 , H01Q3/22 , H01Q3/26 , H04B1/10 , H04B1/26 , H04B1/69 , H04B1/707 , H04B7/08 , H04B15/00 , H04L1/06 , H01Q3/24 , H01S3/16 , H04K1/00 , H04K1/10 , H04L27/30
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.
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公开(公告)号：CA2193843A1
公开(公告)日：1996-01-11
申请号：CA2193843
申请日：1995-06-16
Applicant: INTERDIGITAL TECH CORP
Inventor： SCHILLING DONALD L
IPC: H01Q3/38 , G01S3/42 , H01Q3/22 , H01Q3/26 , H04B1/10 , H04B1/26 , H04B1/69 , H04B1/707 , H04B7/08 , H04B15/00 , H04L1/06 , H04B1/16 , H04B1/04
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.
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公开(公告)号：AU3467793A
公开(公告)日：1993-08-03
申请号：AU3467793
申请日：1993-01-12
Applicant: INTERDIGITAL TECH CORP
Inventor： SCHILLING DONALD L
Abstract: A spread-spectrum transmitter and receiver using code division multiple access with time division multiple access technology for spread-spectrum communications. At a base station, a spread-spectrum transmitter includes a multiplexer for time multiplexing a synchronization-code signal and a plurality of data signals, which may be encoded as a plurality-encoded data signals, to generate a time-multiplexed signal. A chip-code generator generates a chip-code signal which is modulo added with the time-multiplexed signal by an EXCLUSIVE-OR gate to generate a spread-spectrum-time-multiplexed signal. A transmitter transmits the spread-spectrum-time-multiplexed signal over a communications channel. A spread-spectrum receiver at the base station processes a plurality of spread-spectrum signals, received from a plurality of remote units in as time division sequence of spread-spectrum signals, using a despreader circuit to generate a time-division signal. A demultiplexer demultiplexes the time-division signal as a plurality of data signals or as a plurality of privacy-encoded data signals. A remote unit, which may be a handset, includes a despreader circuit for despreading the spread-spectrum-time-multiplexed signal as a time-multiplexed signal. A synchronization-code matched filter detects the synchronization-code signal embedded in the time-multiplexed signal and thereby generates a timing signal. A controller uses the timing signal to generate a control signal. The control signal controls a transmit-receive switch for switching an antenna between the despreader circuit to the transmitter at the remote unit.
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公开(公告)号：CA2615665A1
公开(公告)日：1992-06-15
申请号：CA2615665
申请日：1991-12-10
Applicant: INTERDIGITAL TECH CORP
Inventor： SCHILLING DONALD L
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Patent Agency Ranking
公开(公告)号：CA2320678A1
公开(公告)日：1992-06-15
申请号：CA2320678
申请日：1991-12-10
Applicant: INTERDIGITAL TECH CORP
Inventor： SCHILLING DONALD L
IPC: H04B1/69
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.
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公开(公告)号：CA2679170C
公开(公告)日：2010-10-26
申请号：CA2679170
申请日：1991-12-10
Applicant: INTERDIGITAL TECH CORP
Inventor： SCHILLING DONALD L
Abstract: Disclosed is method including receiving a spread spectrum signal, despreading the received spread spectrum signal using a reference code signal, as a despread reference code signal, despreading the received spread spectrum signal using at least one message code signal, as at least one despread message code signal and using the despread reference code signal as a phase reference for the despreading of the received spread spectrum signal using the at least one message code signal and recovering data from the at least one despread message code signal.
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公开(公告)号：ES2329048T3
公开(公告)日：2009-11-20
申请号：ES05000354
申请日：1991-11-14
Applicant: INTERDIGITAL TECH CORP
Inventor： SCHILLING DONALD L
Abstract: Estación móvil para realizar el control de potencia adaptativo de un transmisor de espectro expandido de la estación móvil que funciona en una red de comunicación celular que usa modulación de espectro expandido, la estación móvil caracterizada por el hecho de que comprende: medios (104) para detectar un nivel de potencia recibido de una señal de amplio espectro genérica en un primer canal; medios (105) para descodificar una señal de datos APC en un canal secundario como un umbral; donde el primer canal y el segundo canal no son un mismo canal; medios (106) para generar una señal de comparación mediante la comparación del nivel de potencia recibido con dicho umbral; medios (112) para transmitir una señal de espectro expandido de transmisión; una antena; y medios de ganancia variable (111) sensibles a dicha señal de comparación para ajustar un nivel de potencia de transmisor de la señal de espectro expandido de transmisión desde dicho transmisor.
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公开(公告)号：ES2303572T3
公开(公告)日：2008-08-16
申请号：ES03008734
申请日：1995-06-16
Applicant: INTERDIGITAL TECH CORP
Inventor： SCHILLING DONALD L
Abstract: Método para llamada de conferencia en un sistema de comunicación de amplio espectro inalámbrico que tiene una pluralidad de unidades, pudiendo operar cada una como una estación base y como una estación remota, comprendiendo el método: una unidad que opera como una estación base que recibe datos de otras de la pluralidad de unidades que operan como estaciones remotas a través de una primera frecuencia; la unidad que opera como una estación base mezclando los datos recibidos de las otras unidades que operan como estaciones remotas con datos de la unidad que opera como una estación base y transmitiendo los datos mezclados a través de una segunda frecuencia; las otras unidades que operan como estaciones remotas recibiendo los datos mezclados a través de la segunda frecuencia de la unidad que opera como una estación base; cada una de las otras unidades que operan como estaciones remotas transmitiendo sus datos a través de la primera frecuencia; y transmitir una orden desde una de las otras unidades que operan como estaciones remotas a la pluralidad de unidades; donde la unidad que transmite la orden opera como una estación base y todas las unidades que reciben la orden operan como estaciones remotas.
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公开(公告)号：DE69535594T2
公开(公告)日：2008-06-12
申请号：DE69535594
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
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