Patents Represented by Attorney, Agent or Law Firm Sayed Hossain Beladi
  • Patent number: 8331504
    Abstract: Systems and methods for multi-user interference cancellation are provided. In one aspect of the disclosure, an apparatus is provided. The apparatus comprises a processing unit configured to process received chips into received symbols for a plurality of users and a detection unit configured to detect user symbols from the received symbols. The apparatus also comprises an interference cancellation unit configured to compute multi-user interference using the detected user symbols and to remove the computed multi-user interference from the received symbols. The apparatus further comprises a redetection unit configured to redetect user symbols from the received symbols with the computed multi-user interference removed.
    Type: Grant
    Filed: May 4, 2009
    Date of Patent: December 11, 2012
    Assignee: Qualcomm Incorporated
    Inventors: Yingqun Yu, Farrokh Abrishamkar, Divaydeep Sikri, Michael McCloud
  • Patent number: 7995684
    Abstract: A receiver operates to AGC a multi-carrier signal through a corresponding number of inner loops and an outer loop AGC processes. A first number of bits for representing the multi-carrier signal with a limited amount of interference is determined through a calibration mode process. The first number of bits provides for quantization of the multi-carrier signal at an outer loop AGC to a maximum quantization level. After the received signal power estimate is reached a predetermined “ON” threshold, the outer loop AGC is operated at a second number of bits higher than the first number of bits to allow a quantization of possible interference in accordance with a difference of the first and second number of bits. The outer loop AGC switches back to use the first number of bits when the received signal power estimate falls below a predetermined “OFF” threshold.
    Type: Grant
    Filed: May 12, 2003
    Date of Patent: August 9, 2011
    Assignee: QUALCOMM, Incorporated
    Inventors: Juan Montojo, Rohan Sudhakar Salvi, Peter J. Black
  • Patent number: 7912485
    Abstract: A method and a system for providing signaling in cellular telephone system providing broadcast services to fully integrate broadcast services with the services provided by the cellular telephone systems. The signaling method coordinate interaction between an access network and the subscriber station to allowing the subscriber station to decode the broadcast service, to receive paging messages while receiving the broadcast service, to properly transition between operation states, and other functions known to one of ordinary skill in the art.
    Type: Grant
    Filed: September 10, 2004
    Date of Patent: March 22, 2011
    Assignee: Qualcomm Incorporated
    Inventors: Ragulan Sinnarajah, Jun Wang, Sanjeev Arvind Athalye
  • Patent number: 7873163
    Abstract: In a communication system (100), a method and apparatus provides for message integrity regardless of the operating version of an authentication center (198) or an interface (197) between the authentication center (198) and a mobile switching center (199). The method and apparatus include generating a cellular message encryption algorithm (CMEA) key, and generating a CMEA-key-derived integrity key (CIK) based on the CMEA key for message integrity between a mobile station and a base station. The mobile station transmits a registration message to the base station, and determines an operating version of the authentication center (198) in communication with the base station based on whether the mobile station receives a registration accepted order or some elements of an authentication vector from the base station. The CIK is generated based on the CMEA key, if the mobile station receives a valid registration accepted order from the base station.
    Type: Grant
    Filed: November 5, 2001
    Date of Patent: January 18, 2011
    Assignee: QUALCOMM Incorporated
    Inventors: Roy Franklin Quick, Jr., Sai Yiu Duncan Ho
  • Patent number: 7505780
    Abstract: Systems and methods for controlling power in a wireless communication system having multiple reverse-link channels. One embodiment comprises adjusting power levels of a first set of channels and a corresponding pilot channel while maintaining a set traffic-to-pilot (T/P) ratio between them, and adjusting T/P ratios for one or more remaining channels independently of the power level of the pilot channel. A base station determines whether frames received on the first set of channels contain errors and sends messages to a mobile station to increment or decrement the power levels, respectively, if the frames do or do not contain errors. T/P ratios of the additional channels are adjusted by determining whether frames received on the additional channels contain errors, incrementing or decrementing the T/P ratios appropriately, and transmitting the T/P ratios to the mobile station, which controls the transmission parameters for the respective channels in accordance with the received T/P ratios.
    Type: Grant
    Filed: July 28, 2003
    Date of Patent: March 17, 2009
    Assignee: QUALCOMM Incorporated
    Inventors: Yongbin Wei, Tao Chen
  • Patent number: 7502420
    Abstract: In a MIMO communication system (100) with limited power for each antenna, a method, apparatus and a processor (420) provide for determining bin energy level allocation to each OFDM frequency bin at each transmit antenna. An estimate of a solution vector including elements of the allocation bin energy level to each OFDM frequency bin at each antenna is determined. An error function based on the determined solution vector is also determined. An error magnitude is determined based on the determined error function. The error magnitude is compared to an error threshold. The processor (420) accepts the estimate of the solution vector with the elements of the allocation bin energy level when the error magnitude is less than the error threshold.
    Type: Grant
    Filed: August 3, 2005
    Date of Patent: March 10, 2009
    Assignee: QUALCOMM Incorporated
    Inventor: John W. Ketchum
  • Patent number: 7477916
    Abstract: A method for managing a point-to-point call initiated (702) between a wireless mobile station (114, 400) and a remote party while the mobile is receiving broadcast content via one or more multi-user forward-link broadcast channels (508). The mobile station notifies (704) the network (110) of preferences as to prescribed categories of operating conditions, such as whether to continue receiving the broadcast content, and election between the point-to-point call and the broadcast content should network resources be able to conduct the point-to-point call and broadcast content concurrently. In accordance with the preferences, communications are conducted (706) in one of the following operating modes: (1) conducting the point-to-point call and discontinuing reception of the broadcast, (2) conducting the point-to-point call and continuing reception of the broadcast, (3) aborting completion of the point-to-point call and continuing reception of the broadcast.
    Type: Grant
    Filed: July 13, 2007
    Date of Patent: January 13, 2009
    Assignee: QUALCOMM Incorporated
    Inventors: Ragulan Sinnarajah, Jun Wang, Tao Chen
  • Patent number: 7310501
    Abstract: A time-varying transformation is used to correlate the magnitude of the interference between multiple antenna paths. Embodiments incorporating the time-varying transformations provide transmit diversity gains to remote stations that are not configured for transmit diversity reception. In addition, some of the embodiments can be further configured to balance the load between multiple power amplifiers.
    Type: Grant
    Filed: February 14, 2006
    Date of Patent: December 18, 2007
    Assignee: QUALCOMM Incorporated
    Inventors: Mark S. Wallace, Stein A. Lundby
  • Patent number: 7062556
    Abstract: A communication system network (500) having a plurality of servers (502-1 through N), each having a load level based on serving a number of clients (501-1 through M), a method includes grouping plurality of servers (502-1 through N) into a plurality of server groups G0 through Gk (503-0 through k) respectively having load levels progressively from a least amount of load level to a most amount of load level, calculating a plurality of time periods T1 through Tk corresponding to the server groups G1 through Gk, assigning load to a server selected from the servers in the server group G0 from an initial time until expiration of the time period T1, after expiration of each of the time periods T1 through Tk measured from the initial time, load assignment takes place by assigning load to a server selected from the servers in the server groups from G0 and and at least one other server group, in server groups G1 through Gk, corresponding to an expiring time period.
    Type: Grant
    Filed: November 22, 1999
    Date of Patent: June 13, 2006
    Assignee: Motorola, Inc.
    Inventors: David T. Chen, Philip J. Fleming
  • Patent number: 6390355
    Abstract: A method for forming a metallic contact and manufacturing a product having an electronic component 101 and a printed circuit board 100 (PCB) includes dispensing a slurry solder paste mixture 104 including a metallic powder 105 and an acidic fluid 106, placing electronic component 101 over solder paste dispensed over a surface area of PCB 100, and applying pressure on at least a section of electronic component 101 such that at least a portion of slurry solder paste mixture 104 dispensed on the surface area and in contact with the section of electronic component 101 consolidates into at least one of an inter-metallic compound of hardened solder and a hardened alloy of solder forming the metallic contact between electronic component 101 and said PCB 100.
    Type: Grant
    Filed: September 3, 1999
    Date of Patent: May 21, 2002
    Assignee: Motorola, Inc.
    Inventor: Richard Hanson Jung
  • Patent number: 6385179
    Abstract: A communication system (100) having packet and circuit switched networks (102 and 101) provides connection between at least a first and a second end users by establishing a call connection via a radio access network (105), establishing a control channel associated the call connection between radio access network (105) and packet switched network (102) through a first packet switched connection, selecting one of packet and circuit switched networks (101 and 102) for establishing a traffic channel associated with the call connection, and routing the traffic channel through said selected network while maintaining the control channel through packet switched network (102).
    Type: Grant
    Filed: November 24, 1999
    Date of Patent: May 7, 2002
    Assignee: Motorola, Inc.
    Inventors: Richard J. Malcolm, Daniel F. Tell, Thomas J. Joyner, William S. Pierce
  • Patent number: 6366880
    Abstract: A noise suppression system implemented in communication system provides an improved level of quality during severe signal-to-noise ratio (SNR) conditions. The noise suppression system, inter alia, incorporates a frequency domain comb-filtering (289) technique which supplements a traditional spectral noise suppression method. The invention includes a real cepstrum generator (285) for an input signal (285) G(k) to produce a likely voiced speech pitch lag component and converting a result to frequency domain to obtain a comb-filter function (290) C(k), applying input signal (291) G(k) to comb-filter function (290) C(k), and equalizing the energies of the corresponding pre and post filtered subbands, to produce a signal (293) G″(k) to be used for noise suppression. This prevents high frequency components from being unnecessarily attenuated, thereby reducing muffling effects of prior art comb-filters.
    Type: Grant
    Filed: November 30, 1999
    Date of Patent: April 2, 2002
    Assignee: Motorola, Inc.
    Inventor: James Patrick Ashley
  • Patent number: 6347228
    Abstract: Apparatus for determining the location of a subscriber unit (1) in a mobile telecommunications network, and particularly in a GSM cellular network, includes the provision of several receiver stations (4, 5, 6) positioned at separate known locations within each cell. Each of the receiver stations (4, 5, 6), which are synchronised by means of an on-board GPS receiver (10), measures the time of arrival of a message transmitted from the subscriber unit (1). The time of arrival measurements recorded by each receiver station (4, 5, 6) are then transmitted to a base transceiver station (2) for computation of the subscriber unit's location relative to the receiver stations. The apparatus can provide a reasonably accurate means for location with a low susceptibility to interference.
    Type: Grant
    Filed: June 8, 1999
    Date of Patent: February 12, 2002
    Assignee: Motorola, Inc.
    Inventors: Brendan Patrick Ludden, Luis Lopes
  • Patent number: 6347140
    Abstract: In a communication system (100), a first echo return loss through communication system (100) associated with a first call connection between a caller (111) and a first caller (114) is estimated. A second echo return loss associated with a second call connection between caller (111) and a second caller (112) is estimated. The call connection may be switching from the first call connection to the second call connection after estimating the first echo return loss, and from the second call connection to the first call connection after estimating the second echo return loss. Echo generated in the first call connection is cancelled based on at least the first echo return loss by an echo canceller in communication system (100) after switching from the second call connection to the first call connection.
    Type: Grant
    Filed: August 12, 1999
    Date of Patent: February 12, 2002
    Assignee: Motorola, Inc.
    Inventors: Mansour Tahernezhaadi, Michael J. Kirk
  • Patent number: 6324572
    Abstract: In a network communication system (300) a method and apparatus includes generating a record of state information (360) associated with a service connection (370), associating the record of state information (360) to a first (320-1) of an N processing units (320-1 through N), storing the associated record of state information (360) at a first (340-1) of an N memory units (340-1 through N) corresponding to the first processing unit (320-1), multicasting the associated record of state information (360) over an area network (310) to be received by at least one of a second through N (320-2 through N) of the N processing units (320-1 through N), and storing the associated record of state information (360) at one of the N memory units corresponding to the least one of the second through N processing units (320-2 through N).
    Type: Grant
    Filed: May 14, 1999
    Date of Patent: November 27, 2001
    Assignee: Motorola, Inc.
    Inventors: Shmuel Silverman, Raymond M. Liss, Randall R. Stewart
  • Patent number: 6321073
    Abstract: An automatic gain control apparatus (106) and method for a radiotelephone receiver employs stored inverse transfer function data (400) of the radiotelephone receiver and a gain estimation circuit (200). The gain estimation circuit (200) estimates the input power of received signal (103) and determines a required gain based on a nonlinear portion of the inverse transfer function data (400) of the radiotelephone receiver to provide an improved dynamic range of the receiver. The apparatus and method performs convergence within one iteration to perform fast gain control. In addition, if desired, a DC offset compensation circuit, such as a feedforward DC offset compensation circuit (202), compensates the digital representation of the input signal for use by the gain estimation circuit (200).
    Type: Grant
    Filed: January 31, 2000
    Date of Patent: November 20, 2001
    Assignee: Motorola, Inc.
    Inventors: Yuda Y. Luz, Ariel Luzzatto, Dean E. Thorson
  • Patent number: 6289203
    Abstract: A method for determining a final propagation loss of a signal transmitted from a transmitter (302) and received at a receiver (303) located in a proximity of a road (340) in a predefined area (350) includes calculating an environmental factor based on a transportation network information associated with predefined area (350), and determining the final propagation loss based on the environmental factor. A method of creating a data base used for calculating the propagation loss includes providing a preliminary data base, calculating a road density constant based on a road profile of predefined area (350), calculating a road constant based on a road classification profile of road (340), calculating the environmental factor by summing the road density constant, and the road constant, and modifying the preliminary data base according to the environmental factor to produce the data base.
    Type: Grant
    Filed: February 25, 1998
    Date of Patent: September 11, 2001
    Assignee: Motorola, Inc.
    Inventors: Jack Anthony Smith, John Douglas Reed, Adam Dewhirst
  • Patent number: 6256338
    Abstract: A method for determining a fading correction factor to be used for correcting a sample of a power delay profile of a received signal in a communication system, the fading correction factor associated with a fading channel characteristic through which the received signal propagates, includes estimating a number (N) of complex samples, obtaining fading channel autocorrelation sequence (R(n)) of the fading channel for a plurality (n) of complex samples, the number of the plurality (n) of complex samples corresponding to the number (N) of complex samples, and computing the fading correction factor based on the number (N) of complex samples, autocorrelation sequence (R(n)), and the number of the plurality (n) of complex samples.
    Type: Grant
    Filed: November 30, 1998
    Date of Patent: July 3, 2001
    Assignee: Motorola, Inc.
    Inventors: Louay Jalloul, Nabil Yousef
  • Patent number: 6253063
    Abstract: A mobile station (110) selects an initial data rate for communication between base station (107) and mobile station (110). Mobile station (110) communicates the selected initial data rate to base station (107) through uplink (112). Base station (107) determines a difference level of interference condition experienced by mobile station (107) between a time when the initial data rate was selected by mobile station (110) and a time when base station (107) prepares to communicate to mobile station (110). Base station (107) selects a final data rate for transmission from base station (107) to mobile station (110) based on the determined difference level of interference condition. As such, the initial data rate may be modified to the final data rate while maximizing the down link capacity.
    Type: Grant
    Filed: January 25, 2000
    Date of Patent: June 26, 2001
    Assignee: Motorola, Inc.
    Inventors: Mark C. Cudak, Brian K. Classon, Louay A. Jalloul, Amitava Ghosh, Robert T. Love
  • Patent number: 6246676
    Abstract: Method and apparatus to provide a pseudo random noise (PN) sequence having a particular code phase offset for use in a radio in a Code Division Multiple Access (CDMA) radio system (100). In one embodiment, a first mask (320) is applied to shift a reference PN sequence to the assigned PN code phase (416). Upon reaching the end of the reference PN sequence, the initial state is reloaded (420) into the PN generator state register to reset the state value to its initial value, thereby producing a cyclical sequence. In a second embodiment, a first mask (622) and a second mask (624) are applied to the reference sequence produced by the PN generator state registers (620) to produce the appropriate portions of the output sequence.
    Type: Grant
    Filed: December 13, 1999
    Date of Patent: June 12, 2001
    Assignee: Motorola, Inc.
    Inventors: Jiangnan Chen, Yuda Y. Luz, Ron Rotstein