Patents Represented by Attorney, Agent or Law Firm Sayed Hossain Beladi
  • Patent number: 5960324
    Abstract: In a satellite communication system, a method of unobtrusively intercepting a communication call includes establishing a first connection to originate from a first satellite subscriber (SU) and terminate at a first node at a first transcoder, establishing a second connection to originate from a second node at a second transcoder and terminate at a second SU, switching the first connection to originate from the first SU and terminate at a third node at the second transcoder, passing a first information carried by the first connection at the third node to the second connection at the second node. The first information without substantial delay or processing is transmitted by the second connection to be received by the second SU. The first information may be decoded in a decoder portion of the second transcoder to produce a first decoded information. The first decoded information, accordingly, may unobtrusively be monitored.
    Type: Grant
    Filed: June 30, 1998
    Date of Patent: September 28, 1999
    Assignee: Motorola, Inc.
    Inventor: Michael Mark Mattera
  • Patent number: 5953659
    Abstract: A method and apparatus for implementing spatial diversity utilizing coaxial interconnections between a plurality of receivers, transmitters and radiating elements in a communication system is disclosed. The long coaxial line used for feeding associated receive antennas is used for creating delay of a signal for implementing downlink diversity. Similarly, the long coaxial lines used for feeding associated transmit antennas are used for creating delay of a signal for implementing uplink diversity. The method and apparatus, in particular, further includes utilization of at least one of the radiating elements for receiving a signal and transmitting a delayed version of a signal to be transmitted.
    Type: Grant
    Filed: May 5, 1997
    Date of Patent: September 14, 1999
    Assignee: Motorola, Inc.
    Inventors: Michael D. Kotzin, Dennis R. Schaeffer
  • Patent number: 5949773
    Abstract: The method of transferring a CDMA data signal (107) associated with a mobile station (103) which operates between a source system (202) and a target system (204). The method includes establishing a frame relay switched virtual circuit (FR SVC) transport function capability in the source system (202) and, consequently generating a plurality of parameters. The method also includes determining that the mobile station (103) requires a transfer of the CDMA data signal (107) which results in forwarding a message from the source system to the target system to transfer the CDMA data signal (107), the message including the plurality of parameters. Based on the plurality of parameters, converting the CDMA data signal (107) into a FR SCV format by the target system (204), forming a frame relay data signal, which is routed via the target system (204) to an inter working function element (IWF)(214) of the source system (202).
    Type: Grant
    Filed: March 31, 1998
    Date of Patent: September 7, 1999
    Assignee: Motorola, Inc.
    Inventors: Rajesh Bhalla, Lewis J. Milton
  • Patent number: 5926761
    Abstract: A wireless communication system (200) estimates (303) the location of a mobile station (215) when a degradation in the mobile station's communication occurs due to interference, and stores (305) the location estimate in a database. The database is used to determine the potential for the mobile station (215) within the wireless communication system to receive interference based on its estimated location or its proximity to the known interference location. When the mobile station (215) is within a predetermined distance of the known interference location, the likelihood for the mobile station (215) to experience a degradation in call quality, duration, etc. increases. To mitigate the degradation due to interference, an alternate carrier (104) is found and if available, the mobile station's communication is handed off to the alternate carrier (104). Attenuation can also be added in the front-end of the mobile station (215) to mitigate the degradation due to interference.
    Type: Grant
    Filed: June 11, 1996
    Date of Patent: July 20, 1999
    Assignee: Motorola, Inc.
    Inventors: John Douglas Reed, Walter Joseph Rozanki, Jr.
  • Patent number: 5913167
    Abstract: A wireless communication system, including a first fixed communication unit and a second fixed communication unit, a mobile communication unit responsive to the first fixed communication unit and the second fixed communication unit, a method for transferring a communication signal associated with the mobile communication unit from the first fixed communication unit to the second fixed communication unit, the method comprising the steps of establishing the communication signal between the first fixed communication unit and the mobile communication unit; and sending a list to the mobile communication unit, the list comprising a reserved traffic channel associated with the second fixed communication unit, the mobile communication unit establishing communication with the second fixed communication unit over the reserved traffic channel when the communication signal is interrupted.
    Type: Grant
    Filed: February 28, 1997
    Date of Patent: June 15, 1999
    Assignee: Motorola, Inc.
    Inventors: Jeffrey D. Bonta, Stephen L. Spear
  • Patent number: 5898696
    Abstract: A method and system for controlling an encoding rate in a communication system utilizes feedforward rate information (48) and/or rate desirability information (50) sent from each of a plurality of variable rate vocoders (34) to a communication link output controller (24), such as a network arbitor. The communication link output controller (24) then sends a feedback control signal (32) to a selected variable rate vocoder to change the encoding rate of the selected variable rate vocoder to facilitate re-encoding of the speech packet when a bottleneck is detected. In another embodiment, the network arbitor (134) may additionally and independently modify speech packet data when it determines that a bottleneck may occur. The network arbitor (134) also communicates a packet modification control signal (132) for the variable rate vocoder that generated the dropped packet so that the corresponding variable rate vocoder can adjust its filter states to maintain convergence.
    Type: Grant
    Filed: September 5, 1997
    Date of Patent: April 27, 1999
    Assignee: Motorola, Inc.
    Inventors: Lee Michael Proctor, James Patrick Ashley
  • Patent number: 5894498
    Abstract: A communication system receives and codes a plurality of information signals according to coding assignments to produce a plurality of coded baseband signals. From these signals, a simulated composite carrier signal is formed which has all the characteristics of an actual composite carrier signal which would have resulted if the plurality of coded baseband signals had been formed. The simulated composite carrier signal is analyzed to determine its peak-to-average ratio. The communication system selects a different coding assignments for coding the plurality of information signals if, based on the determined peak-to-average ratio and a selection criteria, the coding assignment does not produce the desired results. The communication system selects a different coding assignments until at least one or several desired coding techniques have been identified, ranks the coding techniques and makes a final selection of the coding technique to meet the peak-to-average ratio requirements.
    Type: Grant
    Filed: February 26, 1997
    Date of Patent: April 13, 1999
    Assignee: Motorola, Inc.
    Inventors: Michael D. Kotzin, Joseph Schuler
  • Patent number: 5892396
    Abstract: A method and apparatus for controlling the gain of a power amplifier wherein the method includes the steps of attenuating, detecting, and comparing. An attenuator (108) attenuates an amplified version of a radio frequency signal to an attenuated level. A single detector (109) alternatively detects the radio frequency signal power level at a power amplifier (101) input and the attenuated version of the amplified radio frequency signal. The detector (109) produces a first and a second signal each having a DC level representing the detected power levels. An operation amplifier configured for closed loop operation compares the DC levels of the first and second signals to produce a control signal (102) for controlling power amplifier (101) gain. Filters (119) and (120) filter the first and second signals before the comparing step.
    Type: Grant
    Filed: July 31, 1997
    Date of Patent: April 6, 1999
    Assignee: Motorola, Inc.
    Inventors: Mark B. Anderson, Brian D. Wiseman
  • Patent number: 5831478
    Abstract: A method and apparatus in a feedforward amplifier (100) includes a summer (293) summing the desired signal (12) with a pair of tag signals (241, 242). An error signal (226) is coupled with a delayed version of the summed signal (48). The phase and amplitude of signals (226, 237) are adjusted according to a first and second gradient decent controllers (221, 231) output signal (225) which is based on the first DC signal (224) and output signal (235). The output signal (235) is based on the detected power level of a leaked signal at the output coupler (62). The adjustment of the input signal (237) to the second amplifier, when the detected power level fluctuation exceeds a predetermined threshold level, is repeated. The tag signals (241) are produced in phase lock with the sweeping detecting (222) function.
    Type: Grant
    Filed: September 30, 1997
    Date of Patent: November 3, 1998
    Assignee: Motorola, Inc.
    Inventor: James Frank Long