Patents by Inventor Masood K. Tayebi
Masood K. Tayebi has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
-
Patent number: 7990918Abstract: A system and method providing a frame structure to received channel data sent over an air interface of a wireless communication system. The system and method may allow compensation for transmitting and receiving frequency variations, synchronization at the receiver, and provides a virtual signaling channel which may be used for system alarms and status. In one embodiment, the system uses bit stuffing, a frame preamble and a signaling preamble to transmit data at a high data rate in the ISM band.Type: GrantFiled: May 23, 2006Date of Patent: August 2, 2011Assignee: Yoshimi Ltd., Limited Liability CompanyInventors: Cathal O'Scolai, Baya Hatim, Joseph J. Roy, Saeid Safavi, Ismail Lakkis, Hoang Xuan Bui, Deirdre O'Shea, Masood K. Tayebi
-
Patent number: 7050409Abstract: A system and method providing a frame structure to received channel data sent over an air interface of a wireless communication system. The system and method may allow compensation for transmitting and receiving frequency variations, synchronization at the receiver, and provides a virtual signaling channel which may be used for system alarms and status. In one embodiment, the system uses bit stuffing, a frame preamble and a signaling preamble to transmit data at a high data rate in the ISM band.Type: GrantFiled: February 15, 2002Date of Patent: May 23, 2006Assignee: Wireless Facilities, Inc.Inventors: Cathal O'Scolai, Baya Hatim, Joseph J. Roy, Saeid Safavi, Ismail Lakkis, Hoang Xuan Bui, Deirdre O'Shea, Masood K. Tayebi
-
Patent number: 6850582Abstract: A system and method of frame synchronization and detection for use in a digital receiver within a communication system. The digital radio communication system includes a receiver for receiving a signal stream that includes data frames. Each frame includes an arbitrary data sequence and a unique word. A predetermined number of contiguous bits from the unique word are appended to the beginning of each data frame to identify the start of the data frame. The communication system comprises a sampling circuit for sampling symbol levels, a filter to implement the cross correlation of the received signal with the stored unique word, a threshold detector circuit to detect when frame synchronization is achieved as well as additional circuitry to refine the estimate from the threshold detection circuit. The design utilizes coherent demodulation. However, the design is equally applicable to non-coherent demodulation. In one embodiment, the sampling rate is assumed to be two samples per symbol.Type: GrantFiled: March 17, 2003Date of Patent: February 1, 2005Assignee: Wireless Facilities, Inc.Inventors: Deirdre O'Shea, Ismail Lakkis, Saeid Safavi, Masood K. Tayebi, Baya Hatim, Cathal O'Scolai
-
Patent number: 6768780Abstract: A system and method of timing estimation for use in a digital receiver within a communication system. An algorithm calculates the timing offset by evaluating the spectral component at the symbol clock frequency. The spectral component is generated using a nonlinearity operation. However, the maximum likelihood non-data-aided timing estimation equation reveals an alternative approximation for the logarithm of the hyperbolic cosine function present in the maximum likelihood equation, which offers a compromise between implementation complexity and variance performance. The estimated timing offset is then fed to a timing correction unit, which calculates the data samples corresponding to the sampling clock phase and removes the redundant samples. The ideal sampled signal is then forwarded to additional synchronization and functional units for further processing.Type: GrantFiled: January 29, 2002Date of Patent: July 27, 2004Assignee: Wireless Facilities, Inc.Inventors: Ismail Lakkis, Deirdre O'Shea, Masood K. Tayebi, Baya Hatim
-
Patent number: 6684058Abstract: A system and method for converting carrier frequencies of a wireless communication system is provided. The system and method allow expansion of coverage areas of wireless communication systems, such as a mobile/cellular telephone system. In one embodiment, the system converts RF signals in the PCS band to ISM band, and transmits the ISM signals to a distant repeater station. The repeater station receives the ISM signals and down converts the ISM signals to the PCS band. The PCS signals are retransmitted in a new cell thereby creating a new coverage area. Radio frequency signals are down converted to an Intermediate frequency for channel selectivity and narrow band filtering. Channel selectivity circuitry allows quick reuse of other channels in the same cell. The channel selectivity circuitry includes a SAW filter which significantly reduces out of band interference.Type: GrantFiled: January 30, 1998Date of Patent: January 27, 2004Assignee: Wireless Facilities, Inc.Inventors: Ulun Karacaoglu, Baya Hatim, Chi Nche, Masood K. Tayebi
-
Patent number: 6654432Abstract: A receiver for receiving a signal stream in a digital radio communication system. The signal stream includes data frames where each frame including a data signal sequence and a synchronizing signal sequence. The communication system synchronizes the receiver by employing the signal stream. The receiver includes a sampling circuit for sampling symbol levels in the synchronizing signal sequence and a synchronization subsystem. The synchronization subsystem utilizes a frame synchronization circuit, a dynamic interpolator and a decision-directed phase tracking mechanism for removing residual frequency and phase offsets. The synchronization subsystem also includes a threshold detection mechanism for comparing values derived from the sampled frame synchronization output with a predefined value which determines whether synchronization has occurred or not.Type: GrantFiled: June 8, 1998Date of Patent: November 25, 2003Assignee: Wireless Facilities, Inc.Inventors: Deirdre O'Shea, Ismail Lakkis, Saeid Safavi, Masood K. Tayebi
-
Publication number: 20030156672Abstract: A system and method of frame synchronization and detection for use in a digital receiver within a communication system. The digital radio communication system includes a receiver for receiving a signal stream that includes data frames. Each frame includes an arbitrary data sequence and a unique word. A predetermined number of contiguous bits from the unique word are appended to the beginning of each data frame to identify the start of the data frame. The communication system comprises a sampling circuit for sampling symbol levels, a filter to implement the cross correlation of the received signal with the stored unique word, a threshold detector circuit to detect when frame synchronization is achieved as well as additional circuitry to refine the estimate from the threshold detection circuit. The design utilizes coherent demodulation. However, the design is equally applicable to non-coherent demodulation. In one embodiment, the sampling rate is assumed to be two samples per symbol.Type: ApplicationFiled: March 17, 2003Publication date: August 21, 2003Inventors: Deirdre O'Shea, Ismail Lakkis, Saeid Safavi, Masood K. Tayebi, Baya Hatim, Cathal O'Scolai
-
Patent number: 6563856Abstract: A combiner circuit and method for use in a digital transmitter within a communication system. The combiner circuit receives a number of signal streams that include data frames. Each frame includes an arbitrary data sequence and portions of a unique word. The combiner circuit comprises a plurality of digital preamble circuits which append a predetermined number of contiguous bits from the unique word to each data frame. The system utilizes a plurality of spreaders, shifters, and a summer to further modify the data stream for transmission.Type: GrantFiled: July 8, 1998Date of Patent: May 13, 2003Assignee: Wireless Facilities, Inc.Inventors: Deirdre O'Shea, Ismail Lakkis, Saeid Safavi, Masood K. Tayebi, Baya Hatim, Cathal O'Scolai
-
Patent number: 6456678Abstract: A system and method of buffering data of a wireless communication system. The system and method maintain synchronization, end-to-end signaling and coding overhead bits needed to encapsulate data frames sent over wireless media. Additionally, the system and method compensate for transmitting and receiving clock variations. In one embodiment, the system uses framing of data with preamble, stuffing and signaling bits transmitted synchronously at a high data rate in the Industrial, Scientific and Medical (ISM) bands.Type: GrantFiled: February 13, 2001Date of Patent: September 24, 2002Assignee: Wireless Facilities, Inc.Inventors: Joseph J. Roy, Cathal O'Scolai, Baya Hatim, Ismail Lakkis, Saeid Safavi, Deirdre O'Shea, Hoang Xuan Bui, Masood K. Tayebi
-
Patent number: 6373827Abstract: A system and method for communication of radio frequency (RF) signals over multimedia signal paths. The invention provides a wireless multimedia carrier (WMC) system capable of receiving a variety of standardized input signals, such as DS0/E0, T1/E1, T2/E2, and/or T3/E3 for transmission using RF channels. The WMC system selectively employs time division multiple access (TDMA) and/or code division multiple access (CDMA) technology. The WMC system transmits the various signal inputs using RF carriers, receives the transmitted signals, and converts the signals to the desired signaling scheme (standard) for forwarding to intended destinations.Type: GrantFiled: October 20, 1997Date of Patent: April 16, 2002Assignee: Wireless Facilities, Inc.Inventors: Masood K. Tayebi, Baya Hatim, Saeid Safavi, Chi Nche, Ismail Lakkis, Cathal O'Scolai, Deirdre O'Shea, Joseph J. Roy, Ulun Karacaoglu, Hoang Xuan Bui
-
Patent number: 6370158Abstract: A system and method providing a structure to the data sent over the air interface of a wireless communication system. The system and method allow compensation for transmitting and receiving frequency variations, synchronization at the receiver and provision of a virtual signaling channel for system alarms and status. In one embodiment, the system uses bit stuffing, a frame preamble and a signaling preamble to transmit data at a high data rate in the ISM band.Type: GrantFiled: November 14, 1997Date of Patent: April 9, 2002Assignee: Wireless Facilities, Inc.Inventors: Cathal O'Scolai, Baya Hatim, Joseph J. Roy, Saeid Safavi, Ismail Lakkis, Hoang Xuan Bui, Deirdre O'Shea, Masood K. Tayebi
-
Patent number: 6359878Abstract: A system and method of timing estimation for use in a digital receiver within a communication system. A timing estimation block is provided within a digital receiver, where the input signal is processed at four or more samples per symbol and the estimation block operates in a feedforward manner. The algorithm calculates the timing offset by evaluating the spectral component at the symbol clock frequency. The spectral component is generated using a nonlinearity operation. However, the maximum likelihood non-data-aided timing estimation equation reveals an alternative approximation for the logarithm of the hyperbolic cosine function present in the maximum likelihood equation, which offers an excellent compromise between implementation complexity and variance performance. The estimated timing offset is then fed to a timing correction unit, which calculates the data samples corresponding to the sampling clock phase and removes the redundant samples.Type: GrantFiled: July 20, 1998Date of Patent: March 19, 2002Assignee: Wirless Facilities, Inc.Inventors: Ismail Lakkis, Deirdre O'Shea, Masood K. Tayebi, Baya Hatim
-
Publication number: 20010016023Abstract: A system and method of buffering data of a wireless communication system. The system and method maintain synchronization, end-to-end signaling and coding overhead bits needed to encapsulate data frames sent over wireless media. Additionally, the system and method compensate for transmitting and receiving clock variations. In one embodiment, the system uses framing of data with preamble, stuffing and signaling bits transmitted synchronously at a high data rate in the Industrial, Scientific and Medical (ISM) bands.Type: ApplicationFiled: February 13, 2001Publication date: August 23, 2001Inventors: Joseph J. Roy, Cathal O'Scolai, Baya Hatim, Ismail Lakkis, Saeid Safavi, Deirdre O'Shea, Hoang Xuan Bui, Masood K. Tayebi
-
Patent number: 6266385Abstract: A system and method of buffering data of a wireless communication system. The system and method maintain synchronization, end-to-end signaling and coding overhead bits needed to encapsulate data frames sent over wireless media. Additionally, the system and method compensate for transmitting and receiving clock variations. In one embodiment, the system uses framing of data with preamble, stuffing and signaling bits transmitted synchronously at a high data rate in the Industrial, Scientific and Medical (ISM) bands.Type: GrantFiled: December 23, 1997Date of Patent: July 24, 2001Assignee: Wireless Facilities, Inc.Inventors: Joseph J. Roy, Cathal O'Scolai, Baya Hatim, Ismail Lakkis, Saeid Safavi, Deirdre O'Shea, Hoang Xuan Bui, Masood K. Tayebi
-
Patent number: 5807271Abstract: A monitoring system for monitoring detectable intermittent signals generated by a living being. In one embodiment, a pregnancy monitoring system monitors fetal heat beat and/or uterine contractions. A belt is configured to fit around the abdomen of a pregnant woman, with belt ends fastened together at her back. A number of sensors are mounted on the belt to detect fetal heartbeat and transmit corresponding electrical systems, preferably by wireless means, to a distant monitoring station. At least one uterine contraction sensor may also be mounted on the belt for detecting uterine contractions and transmitting a corresponding electrical signal to the monitoring station. In a second embodiment, an apron or jacket for placement in tight, uniform contact over the chest contains a plurality of sensors for detecting cardiac signals. These electrocardiographic signals are transmitted by a wireless transmitter to a distant, central monitoring system to produce a valid data signal at the remote station.Type: GrantFiled: April 14, 1997Date of Patent: September 15, 1998Inventors: Sean Tayebi, Farid Souluer, Surinder Tayebi, Jalil Tayebi, Massih K. Tayebi, Masood K. Tayebi