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公开(公告)号：MY114998A
公开(公告)日：2003-03-31
申请号：MYPI9600743
申请日：1996-02-29
Applicant: QUALCOMM INC
Inventor： MARTIN CHRISTOPHER B , KORNFELD RICHARD K , GREGORY SHERMAN
Abstract: A TRANSCEIVER SYSTEM FOR INTERFACING DIGITAL MODEMS WITH RADIO FREQUENCY SIGNALS IS DESCRIBED. THE TRANSCEIVER SYSTEM INCLUDES AN ANTENNA, AN ANTENNA INTERFACE SYSTEM AND MODEM INTERFACE SYSTEM SEPARATED BY A CABLE. THE ANTENNA IS PLACED IN A LOCATION HAVING OPTIMAL RECEPTION SUCH AS THE ROOF OF A BUILDING AND IN CLOSE PROXIMITY TO THE ANTENNA INTERFACE SYSTEM. THE CABLE COUPLES THE ANTENNA INTERFACE SYSTEM TO THE MODEM INTERFACE SYSTEM WHICH IS PLACED WITHIN THE BUILDING SO THAT IT MAY BE EASILY ACCESSED FOR SERVICE AND CONFIGURATION AND SO THAT IT MAY BE COUPLED TO THE MODEMS. THE MODEM INTERFACE SYSTEM INCLUDES A TWO STATE VARIABLE ATTENUATOR AND AN ATTENUATION REGISTER THAT ARE CONFIGURED TO EITHER REDUCE THE STRENGTH OF THE RECEIVE (RX) SIGNAL WHEN THE MODEMS ARE LOCATED NEAR A BASE STATION, OR TO TRANSMIT THE RX SIGNAL WITHOUT ATTENUATION WHEN THE CONCENTRATED SUBSCRIBER UNIT IS AT A MORE DISTANT LOCATION. THE OUTGOING, OR TRANSMIT (TX), SIGNAL IS ALSO ATTENUATED IN A SIMILAR MANNER TO THE INCOMING SIGNAL. ONCE THE TRANSCEIVER SYSTEM IS PUT IN PLACE, A SIGNAL LOSS DETECTION SYSTEM FIXES THE AMOUNT OF SIGNAL LOSS EXPERIENCED BY THE INCOMING SIGNAL BEFORE BEING SUPPLIED TO THE MODEMS OVER CHANGING ENVIRONMENTAL CONDITIONS. THE SIGNAL LOSS DETECTION SYSTEMS INCLUDES A DETECTOR LOCATED IN THE MODEM INTERFACE SYSTEM THAT RECEIVES AN OSCILLATING SIGNAL TRANSMITTED FROM THE ANTENNA INTERFACE SYSTEM THROUGH THE COAXIAL CABLE. A DIFFERENTIAL INTEGRATOR THEN DETERMINES THE AMOUNT OF SIGNAL LOSS EXPERIENCED BY THIS OSCILLATING SIGNAL BY TRANSMISSION THROUGH THE COAXIAL CABLE AND ATTENUATES THE SIGNAL FROM THE ANTENNA INTERFACE SYSTEM ACCORDINGLY SO THE AMOUNT OF LOSS EXPERIENCED REMAINS CONSTANT OR IS NORMALIZED. ADDITIONALLY, DC POWER IS TRANSMITTED FROM THE MODEM INTERFACE SYSTEM TO THE ANTENNA INTERFACE SYSTEM THROUGH THE COAXIAL CABLE. THE ANTENNA INTERFACE SYSTEM ALLOWS MULTIPLE MODEMS TO GENERATE A SIGNAL USING A SINGLE POWER AMPLIFIER CIRCUIT BY INCLUDING A MAXIMUM POWER LIMITING SYSTEM THAT DETECTS WHEN THE SIGNAL BEING GENERATED EXCEEDS THE CAPACITY OF THE TRANSMIT POWER AMPLIFIER, AND THAT TRANSMIT AN ALARM SIGNAL TO THE MODEM INTERFACE SYSTEM IN RESPONSE SO THAT THE MODEM INTERFACE SYSTEM CAN SIGNAL THE REST OF THE CONCENTRATED SUBSCRIBER SYSTEM.
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公开(公告)号：AU697823B2
公开(公告)日：1998-10-15
申请号：AU5091096
申请日：1996-03-01
Applicant: QUALCOMM INC
Inventor： MARTIN CHRISTOPHER B , KORNFELD RICHARD K , GREGORY SHERMAN
Abstract: A transceiver system for interfacing digital modems with radio frequency signals including an antenna, an antenna interface system and a modem interface system separated by a cable. The antenna is placed in a location having optimal reception and in close proximity to the antenna interface system. The cable couples the antenna interface system to the modem interface system. The modem interface system includes a two state variable attenuator and an attenuation register that are configured to either reduce the strength of the receive (Rx) signal when the modems are located near a base station, or to transmit the Rx signal without attenuation when the concentrated subscriber unit is at a more distant location. The outgoing, or transmit (Tx), signal is also attenuated in a similar manner to the incoming signal. A signal loss detection system includes a detector located in the modem interface system that receives an oscillating signal transmitted from the antenna interface system through the coaxial cable. A differentiating integrator then determines the amount of signal loss experienced by this oscillating signal during transmission through the coaxial cable and attenuates the signal from the antenna interface system accordingly so the amount of loss experienced remains constant. DC power is transmitted from the modem interface system to the antenna interface system through the coaxial cable. A maximum power limiting system detects when the signal being generated exceeds the capacity of the transmit power amplifier and transmits an alarm signal to the modem interface system.
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公开(公告)号：DE69926767D1
公开(公告)日：2005-09-22
申请号：DE69926767
申请日：1999-09-08
Applicant: QUALCOMM INC
Inventor： HARMS BRIAN , GREGORY SHERMAN
IPC: H04B1/7075 , H04B1/708 , H04B1/707
Abstract: The present invention is a method and apparatus for detecting the presence of or acquiring a signal in a data stream, where the signal has been spread using a pseudonoise sequence. The method comprises the steps of delaying a pseudonoise sequence by a plurality of predetermined delays to produce a plurality of delayed pseudonoise sequences, combining each of the delayed pseudonoise sequences with the data stream to produce a plurality of despread data streams, and accumulating each of the despread data streams for a preselected duration to produce a plurality of coherent sums. Each of the coherent sums are accumulated for a further duration to produce a plurality of non-coherent sums. The non-coherent sums are examined to determine the most likely PN offset hypothesis.
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公开(公告)号：ZA961022B
公开(公告)日：1996-08-13
申请号：ZA961022
申请日：1996-02-08
Applicant: QUALCOMM INC
Inventor： MARTIN CHRISTOPHER B , KORNFELD RICHARD K , GREGORY SHERMAN
Abstract: A transceiver system for interfacing digital modems with radio frequency signals including an antenna, an antenna interface system and a modem interface system separated by a cable. The antenna is placed in a location having optimal reception and in close proximity to the antenna interface system. The cable couples the antenna interface system to the modem interface system. The modem interface system includes a two state variable attenuator and an attenuation register that are configured to either reduce the strength of the receive (Rx) signal when the modems are located near a base station, or to transmit the Rx signal without attenuation when the concentrated subscriber unit is at a more distant location. The outgoing, or transmit (Tx), signal is also attenuated in a similar manner to the incoming signal. A signal loss detection system includes a detector located in the modem interface system that receives an oscillating signal transmitted from the antenna interface system through the coaxial cable. A differentiating integrator then determines the amount of signal loss experienced by this oscillating signal during transmission through the coaxial cable and attenuates the signal from the antenna interface system accordingly so the amount of loss experienced remains constant. DC power is transmitted from the modem interface system to the antenna interface system through the coaxial cable. A maximum power limiting system detects when the signal being generated exceeds the capacity of the transmit power amplifier and transmits an alarm signal to the modem interface system.
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公开(公告)号：AT302507T
公开(公告)日：2005-09-15
申请号：AT99945587
申请日：1999-09-08
Applicant: QUALCOMM INC
Inventor： HARMS BRIAN , GREGORY SHERMAN
IPC: H04B1/7075 , H04B1/708 , H04B1/707
Abstract: The present invention is a method and apparatus for detecting the presence of or acquiring a signal in a data stream, where the signal has been spread using a pseudonoise sequence. The method comprises the steps of delaying a pseudonoise sequence by a plurality of predetermined delays to produce a plurality of delayed pseudonoise sequences, combining each of the delayed pseudonoise sequences with the data stream to produce a plurality of despread data streams, and accumulating each of the despread data streams for a preselected duration to produce a plurality of coherent sums. Each of the coherent sums are accumulated for a further duration to produce a plurality of non-coherent sums. The non-coherent sums are examined to determine the most likely PN offset hypothesis.
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Patent Agency Ranking
公开(公告)号：DE69628550T2
公开(公告)日：2004-04-29
申请号：DE69628550
申请日：1996-03-01
Applicant: QUALCOMM INC
Inventor： MARTIN B , KORNFELD K , GREGORY SHERMAN
Abstract: A transceiver system for interfacing digital modems with radio frequency signals including an antenna, an antenna interface system and a modem interface system separated by a cable. The antenna is placed in a location having optimal reception and in close proximity to the antenna interface system. The cable couples the antenna interface system to the modem interface system. The modem interface system includes a two state variable attenuator and an attenuation register that are configured to either reduce the strength of the receive (Rx) signal when the modems are located near a base station, or to transmit the Rx signal without attenuation when the concentrated subscriber unit is at a more distant location. The outgoing, or transmit (Tx), signal is also attenuated in a similar manner to the incoming signal. A signal loss detection system includes a detector located in the modem interface system that receives an oscillating signal transmitted from the antenna interface system through the coaxial cable. A differentiating integrator then determines the amount of signal loss experienced by this oscillating signal during transmission through the coaxial cable and attenuates the signal from the antenna interface system accordingly so the amount of loss experienced remains constant. DC power is transmitted from the modem interface system to the antenna interface system through the coaxial cable. A maximum power limiting system detects when the signal being generated exceeds the capacity of the transmit power amplifier and transmits an alarm signal to the modem interface system.
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公开(公告)号：DE69628550D1
公开(公告)日：2003-07-10
申请号：DE69628550
申请日：1996-03-01
Applicant: QUALCOMM INC
Inventor： MARTIN B , KORNFELD K , GREGORY SHERMAN
Abstract: A transceiver system for interfacing digital modems with radio frequency signals including an antenna, an antenna interface system and a modem interface system separated by a cable. The antenna is placed in a location having optimal reception and in close proximity to the antenna interface system. The cable couples the antenna interface system to the modem interface system. The modem interface system includes a two state variable attenuator and an attenuation register that are configured to either reduce the strength of the receive (Rx) signal when the modems are located near a base station, or to transmit the Rx signal without attenuation when the concentrated subscriber unit is at a more distant location. The outgoing, or transmit (Tx), signal is also attenuated in a similar manner to the incoming signal. A signal loss detection system includes a detector located in the modem interface system that receives an oscillating signal transmitted from the antenna interface system through the coaxial cable. A differentiating integrator then determines the amount of signal loss experienced by this oscillating signal during transmission through the coaxial cable and attenuates the signal from the antenna interface system accordingly so the amount of loss experienced remains constant. DC power is transmitted from the modem interface system to the antenna interface system through the coaxial cable. A maximum power limiting system detects when the signal being generated exceeds the capacity of the transmit power amplifier and transmits an alarm signal to the modem interface system.
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公开(公告)号：AT242564T
公开(公告)日：2003-06-15
申请号：AT96907159
申请日：1996-03-01
Applicant: QUALCOMM INC
Inventor： MARTIN CHRISTOPHER B , KORNFELD RICHARD K , GREGORY SHERMAN
Abstract: A transceiver system for interfacing digital modems with radio frequency signals including an antenna, an antenna interface system and a modem interface system separated by a cable. The antenna is placed in a location having optimal reception and in close proximity to the antenna interface system. The cable couples the antenna interface system to the modem interface system. The modem interface system includes a two state variable attenuator and an attenuation register that are configured to either reduce the strength of the receive (Rx) signal when the modems are located near a base station, or to transmit the Rx signal without attenuation when the concentrated subscriber unit is at a more distant location. The outgoing, or transmit (Tx), signal is also attenuated in a similar manner to the incoming signal. A signal loss detection system includes a detector located in the modem interface system that receives an oscillating signal transmitted from the antenna interface system through the coaxial cable. A differentiating integrator then determines the amount of signal loss experienced by this oscillating signal during transmission through the coaxial cable and attenuates the signal from the antenna interface system accordingly so the amount of loss experienced remains constant. DC power is transmitted from the modem interface system to the antenna interface system through the coaxial cable. A maximum power limiting system detects when the signal being generated exceeds the capacity of the transmit power amplifier and transmits an alarm signal to the modem interface system.
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公开(公告)号：HK1006245A1
公开(公告)日：1999-02-19
申请号：HK98105438
申请日：1998-06-16
Applicant: QUALCOMM INC
Inventor： MARTIN CHRISTOPHER B , KORNFELD RICHARD K , GREGORY SHERMAN
Abstract: A transceiver system for interfacing digital modems with radio frequency signals including an antenna, an antenna interface system and a modem interface system separated by a cable. The antenna is placed in a location having optimal reception and in close proximity to the antenna interface system. The cable couples the antenna interface system to the modem interface system. The modem interface system includes a two state variable attenuator and an attenuation register that are configured to either reduce the strength of the receive (Rx) signal when the modems are located near a base station, or to transmit the Rx signal without attenuation when the concentrated subscriber unit is at a more distant location. The outgoing, or transmit (Tx), signal is also attenuated in a similar manner to the incoming signal. A signal loss detection system includes a detector located in the modem interface system that receives an oscillating signal transmitted from the antenna interface system through the coaxial cable. A differentiating integrator then determines the amount of signal loss experienced by this oscillating signal during transmission through the coaxial cable and attenuates the signal from the antenna interface system accordingly so the amount of loss experienced remains constant. DC power is transmitted from the modem interface system to the antenna interface system through the coaxial cable. A maximum power limiting system detects when the signal being generated exceeds the capacity of the transmit power amplifier and transmits an alarm signal to the modem interface system.
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公开(公告)号：DE69926767T2
公开(公告)日：2006-06-29
申请号：DE69926767
申请日：1999-09-08
Applicant: QUALCOMM INC
Inventor： HARMS BRIAN , GREGORY SHERMAN
IPC: H04B1/7075 , H04B1/708
Abstract: The present invention is a method and apparatus for detecting the presence of or acquiring a signal in a data stream, where the signal has been spread using a pseudonoise sequence. The method comprises the steps of delaying a pseudonoise sequence by a plurality of predetermined delays to produce a plurality of delayed pseudonoise sequences, combining each of the delayed pseudonoise sequences with the data stream to produce a plurality of despread data streams, and accumulating each of the despread data streams for a preselected duration to produce a plurality of coherent sums. Each of the coherent sums are accumulated for a further duration to produce a plurality of non-coherent sums. The non-coherent sums are examined to determine the most likely PN offset hypothesis.
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