Patents Represented by Attorney, Agent or Law Firm Richard A. Sonnentag
  • Patent number: 5854982
    Abstract: To alleviate the constraints imposed on communication system management by the assignment of dedicated ranges of MSISDNs and IMSIs to each particular home location register (HLR.sub.1, HLR.sub.2, HLR.sub.N), the present invention provides an ability to separate IMSIs and MSISDNs between HLR platforms by providing at least two databases (80-90) separated from one another and indexed in terms of ranges of MSISDNs and ranges of IMSIs, as illustrated in FIG. 5. A cross-reference (92, 95) is both stored within a particular MSISDN and a particular IMSI to maintain an association therebetween, thereby allowing access to subscription information stored in at least one of the particular MSISDN and the particular IMSI.
    Type: Grant
    Filed: August 21, 1995
    Date of Patent: December 29, 1998
    Assignee: Motorola, Inc.
    Inventors: David Chambers, Kenneth A. Gustafson, Paul Crichton, Karen E. Hathaway-Norman, Sue Ellen Schroeder, Dennis E. Vogt
  • Patent number: 5838733
    Abstract: A communication system mitigates signal distortion of output signals transmitted by a transmitter element (406). The communication system obtains parameters related to, inter alia, the number of traffic channels utilized by the system, the number of RF channels utilized by the system, the voltage levels of certain signal waveforms (321) within the system and information related to power levels being transmitted by the transmitter element (406). The communication system utilizes the obtained parameters to, in a first embodiment, clip the signal waveform at certain portions that exceed a determined threshold, and, in a second embodiment, automatic gain control the signal waveform during a symbol time period. By clipping or automatically gain controlling the input signal into the transmitting element (406), the distortion of a signal output from the transmitting element (406) is mitigated.
    Type: Grant
    Filed: July 21, 1997
    Date of Patent: November 17, 1998
    Assignee: Motorola, Inc.
    Inventor: Eugene J. Bruckert
  • Patent number: 5828960
    Abstract: A method for wireless communication system planning includes, in a first embodiment, determining an image tree (500), based on a transmitter location (401) and the reflective (415) and diffractive (425) surfaces within a coverage region, and limiting the image tree to exclude branching for higher order images requiring more than a predetermined number of reflections and/or diffractions, or potential child images corresponding to surfaces not within the scope of the parent image (530, 560). Based on the image tree and propagation path back-tracing (620) a received signal quality measure (e.g., power) is determined for each receive location. By comparing the different received signal powers an optimal receiver unit location is determined. Further, by building further image trees for further transmitter locations, an overall coverage quality can be determined for each transmitter and compared to yield an optimal transmitter location.
    Type: Grant
    Filed: March 31, 1995
    Date of Patent: October 27, 1998
    Assignee: Motorola, Inc.
    Inventors: Yuqiang Tang, John Douglas Reed
  • Patent number: 5825762
    Abstract: A transmitter (300) is utilized to provide wireless communication in a sectorized coverage area. The transmitter (300) incorporates a hybrid matrix (303) and an inverse hybrid matrix (306) to combine input control signals (315) and traffic signals (316). The hybrid matrix (303) transforms the control signals (315) and traffic signals (316) into output signals which each contain a portion of the control signals (315) and traffic signals (316). The outputs from the hybrid matrix (303) are amplified by amplifiers (319), and the outputs from the amplifiers (319) are then inverse transformed by the inverse hybrid matrix (306). The inverse transform matrix (306) recombines the portions of the control signals (315) and traffic signals (316) originally input to the hybrid matrix (303), and the resulting signals are transmitted to mobile stations (203-205 and 208) in sectorized coverage areas (S1.sub.A and S1.sub.B) using sector antennas (320).
    Type: Grant
    Filed: September 24, 1996
    Date of Patent: October 20, 1998
    Assignee: Motorola, Inc.
    Inventors: Ralph A. Kamin, Jr., Graham Haddock
  • Patent number: 5822359
    Abstract: A method and apparatus is provided to facilitate coherent communication in a random access channel. In encoding, reference symbols are inserted into a stream of access channel message data symbols and appended to a synchronization message to form a reference coded access channel transmission. Subsequently, the access channel transmission is prepared for transmission over a communication channel by being spread with a spreading code. In decoding, a known synchronization sequence is correlated with a received communication signal to generate a correlation peak when a synchronization message is present. The received communication signal is despread with a spreading code to derive a stream of reference samples and data samples. A channel response is determined from the correlation peak and revised based on estimates derived from the stream of reference samples. Finally, an estimated data symbol is detected from the stream of data samples by utilizing the revised channel response.
    Type: Grant
    Filed: October 17, 1994
    Date of Patent: October 13, 1998
    Assignee: Motorola, Inc.
    Inventors: Eugene J. Bruckert, Shawn B. Dempster, Fuyun Ling
  • Patent number: 5819181
    Abstract: A wireless communication system (200, 300, 400, 500) mitigates the effects of excess timing delay caused by varying lengths of communication paths. In one general implementation, a transition communication path (206, 323, 329) is used to transfer a time-advanced version of a timing reference signal so that the cumulative time delay at a transition cell (209, 325, 331) is reduced. In another general implementation, the timing reference signal is time-advanced in all communication paths (403-411), and selected communication paths (403-407) include a time delay means (423-427, 503-507) such that the cumulative time delay at an area (421) near a target coverage area (130) is reduced. By reducing the cumulative time delay at the area (421) near the target coverage area (130), a handoff of a communication of a mobile station (128) into the target coverage area (130) can be performed.
    Type: Grant
    Filed: February 29, 1996
    Date of Patent: October 6, 1998
    Assignee: Motorola, Inc.
    Inventors: Michael D. Kotzin, Dennis R. Schaeffer, John S. Csapo, Dennis J. Thompson, Stephen L. Spear
  • Patent number: 5805575
    Abstract: A beacon signal (313) is provided in a wireless communication system using a hybrid matrix (303) and an inverse hybrid matrix (306). Using an unused port of the hybrid matrix (303), the beacon signal (313) is combined with traffic signals (316) intended for users of the wireless communication system. The hybrid matrix (303) transforms beacon signal (313) and the traffic signals (316) into output signals that each contain a portion of the beacon signal (313) and the traffic signals (316). The outputs from the hybrid matrix (303) are amplified by amplifiers (315). The outputs from the amplifiers (315) are then inverse transformed by an inverse hybrid matrix (306). The inverse transform matrix (306) recombines the portions of the beacon signal (313) and the traffic signals (316) originally input to the hybrid matrix (303), and the resulting signals are transmitted using sector antennas (320) and a beacon antenna (323).
    Type: Grant
    Filed: August 19, 1996
    Date of Patent: September 8, 1998
    Assignee: Motorola, Inc.
    Inventor: Ralph A. Kamin, Jr.
  • Patent number: 5801654
    Abstract: A frequency translation device in a first embodiment includes a plurality of multiplying digital-to-analog converters (MDACs) that multiply an input signal by phase shifted digital sinewave approximation signals to perform frequency translation. In the preferred embodiment the input includes inphase and quadrature phase components, one of which is multiplied by a digital sinewave approximation and the other is multiplied by a digital cosinewave approximation. The use of the multiple MDACs with differing sinewave approximation signals provides a signal that multiplies the input signal such that the effects of odd harmonics at an output are mitigated while the advantages of a traditional switching mixer are retained.
    Type: Grant
    Filed: March 20, 1995
    Date of Patent: September 1, 1998
    Assignee: Motorola, Inc.
    Inventor: Kevin Bruce Traylor
  • Patent number: 5796722
    Abstract: To mitigate the adverse affects of the load imbalance phenomenon prevalent in spread spectrum, multi-carrier wireless communication systems, the system beneficially employs the use of handoff as a means for balancing the call traffic (commonly referred to as "load") among a plurality of carriers within the communication system. The multi-carrier wireless communication system monitors a plurality of metrics corresponding to the loading of each of the plurality of carriers in the communication system and, based upon the metrics, will handoff call traffic to and between the plurality of carriers, thereby mitigating the adverse effects associated with the load imbalance, in accordance with the invention.
    Type: Grant
    Filed: May 17, 1996
    Date of Patent: August 18, 1998
    Assignee: Motorola, Inc.
    Inventors: Michael D. Kotzin, Philip J. Fleming, Aleksandr L. Stolyar
  • Patent number: 5790515
    Abstract: A communication system receiver sorts through potential Walsh indexes and determines survivors for use in subsequent processing. The sort process is implemented in parallel with the subsequent processing so that large amounts of memory to implement a store/sort are eliminated. The communication system receiver implements the sorting operation in a small number of cycles, thereby conserving cycles which could be beneficially utilized for other tasks as required. The sorting operation also lends itself well to a practical implementation from a communication system receiver design perspective.
    Type: Grant
    Filed: August 28, 1995
    Date of Patent: August 4, 1998
    Assignee: Motorola, Inc.
    Inventor: Robert A. Lipa
  • Patent number: 5767738
    Abstract: A receiver (156) includes both a coherent and noncoherent demodulator. When the confidence that estimates of the channel is high, the coherent demodulator is implemented. When the confidence that estimates of the channel is low, the noncoherent demodulator is implemented. A controlling microprocessor (162) controls the selection process and also provides a signal (158) to enable the noncoherent demodulator in instances when noncoherent demodulation would most likely be better than coherent demodulation. As an example, such an instance would be immediately after handoff of a mobile station (505) from a source base-station (503) to a target base-station (502).
    Type: Grant
    Filed: October 21, 1996
    Date of Patent: June 16, 1998
    Assignee: Motorola, Inc.
    Inventors: Tyler A. Brown, Dennis J. Thompson, Fuyun Ling
  • Patent number: 5764188
    Abstract: A method and apparatus for determining the location of a communication unit in a CDMA system includes in a first embodiment, sending a location request via a spread spectrum signal to the subscriber (140), and receiving in return a subscriber signal including a response message showing a receive time of a particular symbol of the base's spreading sequence and a transmit time of a particular symbol of the subscriber's spreading sequence. The base (130), along with other receiving base(s) (140), also receives a predetermined symbol of the subscriber spreading sequence, and each determines a respective receive time of the predetermined symbol. The received information is then processed, along with known base location and delay information, to determine the subscriber location. If insufficient number of bases are capable of communicating with the subscriber, for example due to high loading/interference, auxiliary bases (121) are also provided for receiving from or transmitting to the subscriber.
    Type: Grant
    Filed: April 24, 1997
    Date of Patent: June 9, 1998
    Assignee: Motorola, Inc.
    Inventors: Amitava Ghosh, John Dougles Reed, Walter Joseph Rozanski, Jr., Kevin Andrew Buford
  • Patent number: 5761634
    Abstract: A code division multiple access (CDMA) communication system reduces system self-interference and enhances system capacity by making rate selection decisions for individual speech encoders in concert with other speech encoders. The system utilizes perpetually weighted error metrics (401) as input into a rate controller (404) which determines and provides selected rates (402) back to the encoders (105). The system provides optimum voice quality and system capacity in that it allows specific encoders to decrease their rate, which improves capacity, as necessary while allowing other encoders to maintain their rates. This prevents needless degradation in voice quality at those times when system capacity needs to be temporarily increased.
    Type: Grant
    Filed: April 4, 1996
    Date of Patent: June 2, 1998
    Assignee: Motorola, Inc.
    Inventors: Kenneth A. Stewart, Michael D. Kotzin
  • Patent number: 5754599
    Abstract: Generally stated, a receiver in a communication system implements coherent channel estimation by first receiving an encoded signal and then generating a complex channel estimate from the encoded signal. The receiver then combines the complex channel estimate with the encoded signal to produce a coherent demodulated signal. After combining, the receiver decodes a version of the coherent demodulated signal to produce an estimate of the encoded signal prior to encoding.
    Type: Grant
    Filed: January 4, 1996
    Date of Patent: May 19, 1998
    Assignee: Motorola, Inc.
    Inventors: Fuyun Ling, Terry Michael Schaffner
  • Patent number: 5751763
    Abstract: Reverse channel power control in a CDMA system is accomplished by measuring a power-control group transmitted from a remote unit (403) and determining a transmission time of a next power-control bit. The measurement of the power-control group is discontinued (405) based on the transmission time of the power-control bit and a round trip delay between the base station and the remote unit in order to transmit the power-control bit (419) to the remote unit in the next time slot.
    Type: Grant
    Filed: March 15, 1996
    Date of Patent: May 12, 1998
    Assignee: Motorola, Inc.
    Inventor: Eugene J. Bruckert
  • Patent number: 5742911
    Abstract: A sectorized cellular radio base station antenna is provided comprising: a plurality (e.g. six) of angularly separated directional transmit antennas (11), each transmit antenna having a central access of transmission, for serving mobile units located in sectors centered on the axis of transmission of the transmit antennas; a plurality (e.g. six) of angularly separated directional receive antennas (30), each having a central axis of reception; and diversity combining means for combining signals from adjacent receive antennas. The central axis of the receiving antennas are at an angular offset to the central axis of the transmit antennas and, for a mobile in a given sector served by a given transmit antenna, the diversity combining means are arranged to combine the signals from the two receive antennas the axes of which lie on either side of that transmit antenna axis.
    Type: Grant
    Filed: June 4, 1996
    Date of Patent: April 21, 1998
    Assignee: Motorola, Inc.
    Inventors: Michael James Dumbrill, Idris John Mark Rees
  • Patent number: 5740530
    Abstract: There is provided a method of rapid Received Signal Strength Indication (RSSI) of a time-dispersed signal having echoes (where the time dispersal represents a significant fraction or more of the transmitted symbol interval). It comprises a sliding correlation of a received signal against a known sequence or via channel sounding to obtain the time-dispersal function of the communications channel upon which the signal is transmitted and a summation of the squares of the quadrature components of the energies at relative maxima of the correlations (correlation peaks determined with reference to a threshold level) to integrate the energy defined by the correlation function to determine the energy present among the time-dispersed echoes utilizing the time-dispersal function.
    Type: Grant
    Filed: May 26, 1992
    Date of Patent: April 14, 1998
    Assignee: Motorola, Inc.
    Inventors: Gerald Paul Labedz, Duane C. Rabe
  • Patent number: 5736964
    Abstract: A method and apparatus for determining the location of a communication unit in a CDMA system includes in a first embodiment, sending a location request via a spread spectrum signal to the subscriber (140), and receiving in return a subscriber signal including a response message showing a receive time of a particular symbol of the base's spreading sequence and a transmit time of a particular symbol of the subscriber's spreading sequence. The base (130), along with other receiving base(s) (140), also receives a predetermined symbol of the subscriber spreading sequence, and each determines a respective receive time of the predetermined symbol. The received information is then processed, along with known base location and delay information, to determine the subscriber location. If insufficient number of bases are capable of communicating with the subscriber, for example due to high loading/interference, auxiliary bases (121) are also provided for receiving from or transmitting to the subscriber.
    Type: Grant
    Filed: February 16, 1996
    Date of Patent: April 7, 1998
    Assignee: Motorola, Inc.
    Inventors: Amitava Ghosh, John Douglas Reed, Walter Joseph Rozanski, Jr., Kevin Andrew Buford
  • Patent number: 5734967
    Abstract: A code division multiple access (CDMA) communication system reduces interference by reducing the encoding rate for selected mobiles. The system primarily uses link related characteristics such as, inter alia, distance measurements, physical resource power and mobile determined noise, to determine which mobiles require a encoding rate reduction. Once determined, the encoding rate of the determined mobiles is reduced, which in turn reduces self-interference and enhances system capacity.
    Type: Grant
    Filed: December 20, 1995
    Date of Patent: March 31, 1998
    Assignee: Motorola, Inc.
    Inventors: Michael D. Kotzin, Kenneth A. Stewart
  • Patent number: 5726764
    Abstract: A new data circuit equipment (DCE) coupled to an IWF and a terminal adapter (TA) coupled to a mobile station provide interconnection within a RF communication system such that Class 2 service common to wireline network equipment can be beneficially employed in the wireless RF communication system. The new DCE and TA are transparent to external wireline systems while maintaining compatibility with, inter alia, the predetermined data service protocol layers of the RF communication system, the RF air-interface and/or radio link protocol (RLP) of the RF communication system.
    Type: Grant
    Filed: February 8, 1995
    Date of Patent: March 10, 1998
    Assignee: Motorola, Inc.
    Inventors: Rod Averbuch, Timothy J. Wilson