Patents Represented by Attorney, Agent or Law Firm Richard A. Sonnentag
  • Patent number: 5722072
    Abstract: A method for determining a handover for a mobile station in a multicellular communication system including the steps of measuring received signal parameters received from a serving cell and a plurality of neighboring cells, comparing received signal parameters with a variable threshold value for each of the plurality of neighbor cells, measuring the amount of time, or the number of times, the received signal parameters are above the threshold value for each of the plurality of neighbor cells, and determining handover based on the measurement.
    Type: Grant
    Filed: March 20, 1995
    Date of Patent: February 24, 1998
    Assignee: Motorola, Inc.
    Inventors: Paul Crichton, Rupinder Singh Oberoi, Howard Thomas
  • Patent number: 5710990
    Abstract: An apparatus (10) for adjusting peak-to-average power of a multicarrier signal. The apparatus (10) comprises a first (26) and second (28) combiner, a phase-changing device (30), and a switch (36). The first combiner (26) receives a first group of channels (20) and a second group of channels (22) and produces a first combined signal (46). The phase-changing device (30) receives the first group of channels (20) and produces a group of phase-adjusted channels. The second combiner (28) receives the phase-adjusted channels and the second group of channels (22) and produces a second combined signal (48), and the switch (36) responds to the first (26) and second (28) combiners and selects at least one of the first (46) and second (48) combined signals.
    Type: Grant
    Filed: March 21, 1996
    Date of Patent: January 20, 1998
    Assignee: Motorola, Inc.
    Inventors: James Frank Long, Yuda Y. Luz
  • Patent number: 5710763
    Abstract: A filter fast Fourier transmultiplexer divides a multi-channel communication signal into single channel communication signals through a cascade of filters and mixers. The output sample rate is maintained at the input sample rate and memory requirements and computations are substantially reduced.
    Type: Grant
    Filed: July 31, 1995
    Date of Patent: January 20, 1998
    Assignee: Motorola, Inc.
    Inventor: Robert Mark Harrison
  • Patent number: 5708969
    Abstract: A method of reducing interference within a cellular system (10) by partitioning a designated frequency spectrum within a service coverage area (11, 12, 13, 14, 15, 16, or 17) into a first and at least second spectrum inclusive of the designated frequency spectrum and each with an associated power level. Assignment of communication units to a spectrum and power level are based upon distance from the base site (as determined through signal strength measurements). The spectral content of spectra in adjacent service coverage areas is adjusted to include non-coincidental frequencies.
    Type: Grant
    Filed: January 25, 1994
    Date of Patent: January 13, 1998
    Assignee: Motorola, Inc.
    Inventors: Michael Kotzin, Eugene Bruckert
  • Patent number: 5701297
    Abstract: There is provided a mechanism for providing data services over a wireless cellular network. It comprises: establishing communications over the cellular network; upon a subscriber designating that it has a data communication, redirecting data traffic to the designated frequency (a shared data channel) on an interconnected wireless data network exhibiting (cellular) reuse of data channel frequencies; and returning the subscriber's transceiver to voice mode upon cessation of data communications. Data service will appear to have been provided by the cellular network.
    Type: Grant
    Filed: July 28, 1994
    Date of Patent: December 23, 1997
    Assignee: Motorola, Inc.
    Inventors: John Steven Csapo, James Peter Aldrich, Ben Douglas Gay
  • Patent number: 5697073
    Abstract: A transmitter architecture is disclosed which offers a new combination of signal shaping and power control which optimizes transmitter noise figure performance. The disclosed apparatus and method is implemented by separating the shaping element (303) from the power control elements (406, 412, 418) in frequency. Placing the shaping element (303) at a fixed intermediate frequency (IF) allows for the use of readily available, temperature stable shaping elements while distributing the power control elements (406, 412, 418) at radio frequency (RF) facilitates optimization of noise figure performance in the transmitter (200).
    Type: Grant
    Filed: August 26, 1994
    Date of Patent: December 9, 1997
    Assignee: Motorola, Inc.
    Inventors: Christopher John Daniel, Kevin Joseph Holoubek
  • Patent number: 5687198
    Abstract: A receiver (200, 400) implements improved channel estimation. The receiver (200, 400) demodulates a transmitted signal, and makes an initial channel estimate (115). The receiver (200, 400) then makes a hard decision (301) as to whether the channel estimate was correct and groups samples representing the decision. A vector sum of the group of samples is computed (302), and each sample is compared to the vector sum (303). The sample having the largest projection on the vector sum is retained (304), and the other samples are considered noise, and are thus discarded (305). After obtaining a predetermined number of retained samples (306), the retained samples are used to generate an new channel estimate (226). Since the noisy estimates are discarded, the new channel estimate (226) contains fewer errors than the initial channel estimate (115). The new channel estimate (226) is used to generate decoded data (250).
    Type: Grant
    Filed: January 4, 1996
    Date of Patent: November 11, 1997
    Assignee: Motorola, Inc.
    Inventors: Thomas A. Sexton, Fuyun Ling
  • Patent number: 5684795
    Abstract: In a Time Division Multiple Access System, multiple offset values are provided to a divider control circuit (213) of a fractional-N synthesizer (200) by utilizing a microprocessor (305). The microprocessor (305) utilizes timeslot information provided to it by a timeslot selector (301), frequency information provided to it by a frequency selector (303) and a read-only memory (307), to provide offset values to the divider control circuit (213).
    Type: Grant
    Filed: January 30, 1996
    Date of Patent: November 4, 1997
    Assignee: Motorola, Inc.
    Inventors: Christopher John Daniel, Thomas J. Kovarik, Robert Scott Swenson
  • Patent number: 5682416
    Abstract: A method of communication handover from a first communication entity (33) to a second communication entity (43) in a communication system (10) where a communication unit (80), communicating with a transceiver (23) associated with the second communication entity, is linked to the first communication entity. The invention provides for establishing a communication link between the communication unit and the second communication entity while maintaining a communication link between the communication unit and the first communication entitiy. Then, communications are substantially simultaneously transfered to the second communication entity while terminated from the first communication entity.
    Type: Grant
    Filed: May 9, 1995
    Date of Patent: October 28, 1997
    Assignee: Motorola, Inc.
    Inventors: Chris Schmidt, Michael D. Kotzin, Barry J. Menich, Eugene J. Bruckert
  • Patent number: 5671255
    Abstract: A receiver (500) utilizes parameters generated by a Viterbi decoder (530) to determine one of a plurality of coding rates in which user information is transmitted. The receiver (500) combines the parameters in a predetermined manner, the result of which is a detection statistic (dij). By utilizing the detection statistic (dij), the coding rate at which user information is accurately determined.
    Type: Grant
    Filed: March 29, 1996
    Date of Patent: September 23, 1997
    Assignee: Motorola, Inc.
    Inventors: Michael Mao Wang, Fuyun Ling, Kenneth A. Stewart
  • Patent number: 5659622
    Abstract: A noise suppression system implemented in communication system provides an improved update decision during instances of sudden increase in background noise level. The noise suppression system, inter alia, generates an update by continually monitoring the deviation of spectral energy and forcing an update based on a predetermined threshold criterion. The spectral energy deviation is determined by utilizing an element which has the past values of the power spectral components exponentially weighted. The exponential weighting is a function of the current input energy, which means the higher the input signal energy the longer the exponential window. Conversely, the lower the signal energy the shorter the exponential window. The noise suppression system also inhibits a forced update during periods of continuous, non-stationary input signals (such as "music-on-hold").
    Type: Grant
    Filed: November 13, 1995
    Date of Patent: August 19, 1997
    Assignee: Motorola, Inc.
    Inventor: James P. Ashley
  • Patent number: 5659573
    Abstract: A method and apparatus is provided for facilitating coherent communication reception. A received reference symbol coded spread spectrum communication signal is despread with a spreading code to derive a stream of reference samples and a stream of data samples. The channel response is estimated by utilizing the stream of reference samples. An offset frequency detector determines an offset to be applied to the received signal via a frequency locked loop, while a timing control compensates for slow timing drift and fast fading based on power estimates derived from the stream of reference samples and/or the stream of data samples. A slot detector controls gates which optimize the timing control and frequency offset detector outputs from the various timing branches. Thus an improved detection of estimated data symbols from the stream of received data samples is provided.
    Type: Grant
    Filed: October 4, 1994
    Date of Patent: August 19, 1997
    Assignee: Motorola, Inc.
    Inventors: Eugene J. Bruckert, Fuyun Ling
  • Patent number: 5650913
    Abstract: A surface mountable component (110) is urged toward a substrate (102) during a bonding operation. The apparatus consists of a thermally activated clamping device (TACD) (300) having alloys with differing relative deflection-temperature characteristics. When exposed to elevated temperatures, the thermally activated clamping device (300) deforms a predetermined amount depending upon the heat-energy applied to the thermally activated clamping device (300). This allows for a mounting bracket that applies a force on a component (110) in proportion to an amount of heat-energy applied to the mounting bracket. In addition, the thermally activated clamping device (300) is coupled locally to the substrate in an area surrounding the component which eliminates the need for long, fragile mounting brackets. The method consists of utilizing the relative deflection-temperature characteristics of metals to clamp a component (110) during a bonding operation.
    Type: Grant
    Filed: November 22, 1995
    Date of Patent: July 22, 1997
    Assignee: Motorola, Inc.
    Inventor: Ronald Peter Kochanski
  • Patent number: 5646444
    Abstract: An apparatus to improve upon the problem of mismatched CTEs in electrical circuits comprises a small heat sink (206), a substrate (202), and an aperture existing within the substrate (202). The heat sink (206) is located on one side of the substrate (202) in a location substantially overlapping the aperture (204). The transistor (106) is coupled to the heat sink (206) and extends through the aperture (204). The apparatus reduces manufacturing costs since no exotic bonding agents are needed to accommodate for the mismatch in CTEs. Additionally, the apparatus reduces the number of substrates required during the manufacturing process, and allows for the heat sink (206) to be soldered in an automated fashion to the bottom of the substrate (202) in much the same way component parts are reflowed onto the top of a printed circuit board.
    Type: Grant
    Filed: October 5, 1995
    Date of Patent: July 8, 1997
    Assignee: Motorola, Inc.
    Inventors: Michael H. Bartlett, Michael C. Wuensch
  • Patent number: 5640431
    Abstract: A method and apparatus for improved offset frequency estimation includes in a first embodiment a receiver (100) for coherent reception of a signal having known reference information, the receiver including an extractor (106) for extracting the reference information (107) from the signal, and an offset frequency estimator (110). The offset frequency estimator (110) includes a filter (121) for filtering the reference information and outputting a filtered reference sequence; a correlator (122, 124) for correlating the filtered reference sequence against a predetermined reference signal to form correlation values; and a peak detector (126) for determining an offset frequency estimate (131) from the correlation values. Other embodiments are also shown.
    Type: Grant
    Filed: March 10, 1995
    Date of Patent: June 17, 1997
    Assignee: Motorola, Inc.
    Inventors: Eugene J. Bruckert, Fuyun Ling, Thomas A. Sexton
  • Patent number: 5638375
    Abstract: In a communications system having transmissions containing certain information-of-interest at predetermined intervals in the transmission, there is provided a method for isolating and processing that information-of-interest. The method comprises sensing the start of a transmission and isolating for processing as the information-of-interest, the information received about instant(s) predeterminally removed in time from the sensed start of transmission. Thus, the information-of-interest is isolated principally on the basis of elapsed time.
    Type: Grant
    Filed: November 30, 1988
    Date of Patent: June 10, 1997
    Assignee: Motorola, Inc.
    Inventors: Gregory J. Dettro, Gerald P. Labedz, Frederick G. Atkinson
  • Patent number: 5627830
    Abstract: An RF cellular communication system employing offset frame synchronization between cells, any cell being omni-directional or directional, such that a frame at one cell is offset by an integral number of frames from another cell; the system incorporating multiplexed speech transcoding of traffic channels from multiple cells while supporting stringent delay requirements. Offset frame synchronization for providing rapid mobile assisted handoff.
    Type: Grant
    Filed: March 31, 1993
    Date of Patent: May 6, 1997
    Assignee: Motorola, Inc.
    Inventor: Michael D. Kotzin
  • Patent number: 5619524
    Abstract: A method and apparatus is provided for facilitating coherent communication reception. A received reference symbol coded spread spectrum communication signal is despread with a spreading code to derive a stream of reference samples and a stream of data samples. The channel response is estimated by utilizing the stream of reference samples. An offset frequency detector determines an offset to be applied to the received signal via a frequency locked loop, while a timing control compensates for slow timing drift and fast fading based on power estimates derived from the stream of reference samples and/or the stream of data samples. A rate estimator determines the rate at which the information was encoded, and the rate information is used to optimize the timing control, frequency offset detector and channel estimator. Thus an improved detection of estimated data symbols from the stream of received data samples is provided.
    Type: Grant
    Filed: February 28, 1995
    Date of Patent: April 8, 1997
    Assignee: Motorola, Inc.
    Inventors: Fuyun Ling, Thomas A. Sexton, Gene Bruckert
  • Patent number: 5604787
    Abstract: A smart card (100) is equipped with an internal time-of-day clock and calendar (106). Between the smart card (100) and a subscriber unit (209, 300), into which it is inserted, there is a communication of the subscriber's identity and a negotiated agreement for how long the subscriber unit (209, 300) is to maintain the transferred identity. For that duration of time, the subscriber unit (209, 300) is enabled with the subscriber's identity, and the smart card is essentially "dumb," and therefore unusable until that duration has elapsed.
    Type: Grant
    Filed: October 7, 1994
    Date of Patent: February 18, 1997
    Assignee: Motorola, Inc.
    Inventors: Michael D. Kotzin, Jeffrey D. Bonta
  • Patent number: D390553
    Type: Grant
    Filed: January 16, 1996
    Date of Patent: February 10, 1998
    Assignee: Motorola, Inc.
    Inventors: Thomas Glenn Beaumont, Bruce Wade Ross, Paul Sylvester Stevens