Patents by Inventor Behzad Mohebbi
Behzad Mohebbi 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).
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Publication number: 20090239521Abstract: A repeater mediates traffic between a network transceiver and a user transceiver in a wireless communication system. The repeater comprises a network unit that maintains a network link with the network transceiver, a user unit that maintains a user link with the user transceiver, a two-way communication pathway between the network unit and the user unit adapted to communicate signals between the network transceiver and the user transceiver in autonomous repeater hops between the network transceiver and the network unit, between the user transceiver and the user unit, and between the network unit and the user unit including downlink transmission from the network unit to the user unit and uplink transmission from the user unit to the network unit, and a detection unit coupled to the network unit and the user unit adapted to detect frame timing of downlink and uplink transmissions respectively by detecting a preamble sequence of downlink and/or uplink transmissions.Type: ApplicationFiled: February 2, 2007Publication date: September 24, 2009Inventor: Behzad Mohebbi
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Patent number: 7519323Abstract: A repeater mediates traffic between a network transceiver and a user transceiver in a wireless communication system. The repeater comprises a network unit that maintains a network link with the network transceiver, a user unit that maintains a user link with the user transceiver, a two-way communication pathway between the network unit and the user unit; that facilitate the communication of signals between the network transceiver and the user transceiver in autonomous repeater hops between the network transceiver and the network unit, between the user transceiver and the user unit, and between the network unit and the user unit, and beam-formers respectively coupled to the network unit and the user unit and adapted to communicate signals in an operating frequency band of the network and user transceivers and to control effective radiated power.Type: GrantFiled: January 11, 2005Date of Patent: April 14, 2009Assignee: Nextivity, Inc.Inventor: Behzad Mohebbi
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Publication number: 20070264935Abstract: Systems and methods for full duplex communications on a wireless link between two transceiver devices are disclosed. A first portion of outbound data is transmitted from one transceiver device to the other transceiver device on a first channel, while a first portion of inbound data from the other transceiver device is received on a second channel and the presence of a radiating source other than the inbound data is detected. A second portion of the outbound data is transmitted from the transceiver device to the other transceiver device on the second channel, while a second portion of the inbound data is received from the other of the two transceiver devices on the first channel and the presence of a radiating source other than the inbound data is detected.Type: ApplicationFiled: May 2, 2007Publication date: November 15, 2007Inventor: Behzad Mohebbi
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Publication number: 20070155314Abstract: A repeater mediates traffic between a network transceiver and a user transceiver in a wireless communication system. The repeater comprises a network unit that maintains a network link with the network transceiver, a user unit that maintains a user link with the user transceiver, a two-way communication pathway between the network unit and the user unit; that facilitate the communication of signals between the network transceiver and the user transceiver in autonomous repeater hops between the network transceiver and the network unit, between the user transceiver and the user unit, and between the network unit and the user unit, and beam-formers respectively coupled to the network unit and the user unit and adapted to communicate signals in an operating frequency band of the network and user transceivers and to control effective radiated power.Type: ApplicationFiled: January 11, 2005Publication date: July 5, 2007Inventor: Behzad Mohebbi
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Patent number: 7236788Abstract: In a call setup process for setting up a call for a mobile station of the network, respective uplink and downlink channels are allocated between the mobile station and a first one of a plurality of base transceiver stations of the network. The mobile station and at least one further base transceiver station of the plurality, neighbouring the said first base transceiver station, are provided with call setup information for use by the mobile station and the or each further base transceiver station to allocate respective uplink and downlink channels between the further base transceiver station concerned and the mobile station.Type: GrantFiled: December 29, 2004Date of Patent: June 26, 2007Assignee: Fujitsu LimitedInventor: Behzad Mohebbi
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Publication number: 20070112901Abstract: In one embodiment, a configurable device is provided for multiplying a plurality of digital words with a corresponding plurality of coefficients. The configurable digital filter includes: a plurality of lookup tables, each lookup table corresponding to at least one of the coefficients and operable to receive at least a portion of a corresponding at least one of the digital words, each lookup table configured multiples of the corresponding at least one coefficient such that the lookup table is operable to retrieve an entry to provide an output equaling a multiplication of the portion with the corresponding at least one coefficient.Type: ApplicationFiled: November 15, 2005Publication date: May 17, 2007Inventors: Afshin Niktash, Alireza Moshtaghi, Behzad Mohebbi, Hooman Parizi
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Publication number: 20060172781Abstract: A repeater mediates traffic between a network transceiver and a user transceiver in a wireless communication system. The repeater comprises a network unit that maintains a network link with the network transceiver, a user unit that maintains a user link with the user transceiver, a two-way communication pathway between the network unit and the user unit; that facilitate the communication of signals between the network transceiver and the user transceiver in autonomous repeater hops between the network transceiver and the network unit, between the user transceiver and the user unit, and between the network unit and the user unit, and a gain controller that compensates for propagation losses between the network unit and user unit alone.Type: ApplicationFiled: March 2, 2006Publication date: August 3, 2006Inventor: Behzad Mohebbi
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Patent number: 6965772Abstract: A cellular mobile communications network includes a base station controller and an array of base transceiver stations. Each base transceiver station has a communications path connecting it to the base station controller such that when an uplink signal is received from a mobile station of the network by a plurality of the base transceiver stations of the array, each base transceiver station can transfer the received uplink signal via its communications path to the base station controller. The communications paths are assessed according to predetermined characteristics, and based on this assessment, at least one base transceiver station of the plurality is prevented from transferring the received uplink signal to the base station controller.Type: GrantFiled: November 2, 2000Date of Patent: November 15, 2005Assignee: Fujitsu LimitedInventors: Behzad Mohebbi, Sunil Keshavji Vadgama
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Patent number: 6925303Abstract: In a cellular mobile communications network a mobile station is capable of receiving a downlink signal from each of a plurality of base stations and transmitting an uplink signal to the plurality of base stations through a wireless channel. A transmission property of the downlink signals from the plurality of base stations to the mobile station is measured, and decided, in dependence upon the measure of the transmission property, a preferred base station transmitting the downlink signal with a preferred transmission property among the plurality of the base stations. The mobile station includes, in the uplink signal, data indicating the preferred base station(s) for transmitting the subsequent downlink signal to the mobile station. The base stations receiving the uplink signal identify from the data the preferred based station(s) and only the base station(s) identified as the preferred base station(s) transmits a subsequent downlink signal to the mobile station.Type: GrantFiled: March 18, 2003Date of Patent: August 2, 2005Assignee: Fujitsu LimitedInventors: Behzad Mohebbi, Michael John Shearme
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Publication number: 20050113093Abstract: In a call setup process for setting up a call for a mobile station of the network, respective uplink and downlink channels are allocated between the mobile station and a first one of a plurality of base transceiver stations of the network. The mobile station and at least one further base transceiver station of the plurality, neighbouring the said first base transceiver station, are provided with call setup information for use by the mobile station and the or each further base transceiver station to allocate respective uplink and downlink channels between the further base transceiver station concerned and the mobile station.Type: ApplicationFiled: December 29, 2004Publication date: May 26, 2005Inventor: Behzad Mohebbi
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Patent number: 6889046Abstract: In a cellular mobile communications network a mobile station is capable of receiving a downlink signal from each of a plurality of base stations and transmitting an uplink signal to the plurality of the base stations through a wireless channel. The mobile station produces a measure of signal quality of the downlink signals from the plurality of base stations to the mobile station and selects a base station from which the downlink signal shows a preferred signal quality. The mobile station transmits an uplink signal indicating the selected base station among the plurality of base stations for subsequent communications with the mobile station. Each base station processes the uplink signal to identify the selected base station from among the plurality of base stations.Type: GrantFiled: January 11, 2002Date of Patent: May 3, 2005Assignee: Fujitsu LimitedInventor: Behzad Mohebbi
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Patent number: 6862449Abstract: In a cellular mobile communications network a mobile station is capable of receiving a downlink signal from each of a plurality of base stations and transmitting an uplink signal to the plurality of base stations through a wireless channel. A transmission property of the downlink signals from the plurality of base stations to the mobile station is measured, and decided, in dependence upon the measure of the transmission property, a preferred base station transmitting the downlink signal with a preferred transmission property among the plurality of the base stations. The mobile station includes, in the uplink signal, data indicating the preferred base station(s) for transmitting the subsequent downlink signal to the mobile station. The base stations receiving the uplink signal identify from the data the preferred based station(s) and only the base station(s) identified as the preferred base station(s) transmits a subsequent downlink signal to the mobile station.Type: GrantFiled: October 25, 2000Date of Patent: March 1, 2005Assignee: Fujitsu LimitedInventors: Behzad Mohebbi, Michael John Shearme
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Patent number: 6859486Abstract: A method for predicting interference experienced by a first cell (102) from a second cell (104), where both cells (102, 104) have at least one frequency hopping parameter, comprises the steps of determining (step 402) an estimated interference level corresponding to interference experienced by the first cell (102) due to the second cell (104); calculating the probability of the first cell hopping to substantially the same frequency as the second cell; weighting (step 406) the estimated interference level with the calculated probability, and modifying (step 314) the at least one frequency hopping parameter in order modify the weighted estimated interference level.Type: GrantFiled: December 7, 1998Date of Patent: February 22, 2005Assignee: Motorola, Inc.Inventor: Behzad Mohebbi
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Patent number: 6836661Abstract: In a cellular mobile communications network a mobile station is capable of receiving a downlink signal from each of a plurality of base stations and transmitting an uplink signal to the plurality of the base stations through a wireless channel. The mobile station produces a measure of signal quality of the downlink signals from the plurality of base stations to the mobile station and selects a base station from which the downlink signal shows a preferred signal quality. The mobile station transmits an uplink signal indicating the selected base station among the plurality of base stations for subsequent communications with the mobile station. Each base station processes the uplink signal to identify the selected base station from among the plurality of base stations.Type: GrantFiled: January 11, 2002Date of Patent: December 28, 2004Assignee: Fujitsu LimitedInventor: Behzad Mohebbi
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Patent number: 6768907Abstract: A cellular mobile communications network includes a mobile station (40), a plurality of base transceiver stations (20), each for receiving uplink signals from the mobile station (40), and a base station controller (30) connected to the base transceiver stations (20) for receiving therefrom such uplink signals. During a hand-off operation involving more than one of the base transceiver stations (20) of the network, a subset of those base transceiver stations (20) involved in the hand-off operation is selected, the subset being those base transceiver stations (20) which are to forward a received uplink signal to the base station controller (30). At least one of the base transceiver stations (20) involved in the hand-off operation is operable, when that station is involved in such a hand-off operation, to determine, based on the subset of base transceiver stations, whether or not to forward to the base station controller (30) such an uplink signal received from the mobile station (40).Type: GrantFiled: February 9, 2001Date of Patent: July 27, 2004Assignee: Fujitsu LimitedInventor: Behzad Mohebbi
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Patent number: 6754496Abstract: In a cellular mobile communications network a mobile station is capable of receiving a downlink signal from each of a plurality of base stations and transmitting an uplink signal to the plurality of base stations through a wireless channel. A transmission property of the downlink signals from the plurality of base stations to the mobile station is measured, and decided, in dependence upon the measure of the transmission property, a preferred base station transmitting the downlink signal with a preferred transmission property among the plurality of the base stations. The mobile station includes, in the uplink signal, data indicating the preferred base station(s) for transmitting the subsequent downlink signal to the mobile station. The base stations receiving the uplink signal identify from the data the preferred based station(s) and only the base station(s) identified as the preferred base station(s) transmits a subsequent downlink signal to the mobile station.Type: GrantFiled: March 18, 2003Date of Patent: June 22, 2004Assignee: Fujitsu LimitedInventors: Behzad Mohebbi, Michael John Shearme
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Patent number: 6724815Abstract: A method is provided for improving the data throughput of a communication system (100) operating under different radio propagation conditions and with radio equipment with different training data requirements. The data rate is increased by optimising the training data structure (205) for the individual radio channel (105) rather than globally employing a worst case training data structure(205). The invention is applicable to the GSM cellular communication system where increased data rate is achieved by setting up links with midamble (205) replaced by user data (203) when allowed by the propagation conditions.Type: GrantFiled: May 19, 2000Date of Patent: April 20, 2004Assignee: Motorola, Inc.Inventors: Rene Jepsen, Behzad Mohebbi, Howard Benn
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Patent number: 6658252Abstract: In a cellular mobile communications network a mobile station is capable of receiving a downlink signal from each of a plurality of base stations and transmitting an uplink signal to the plurality of the base stations through a wireless channel. The mobile station produces a measure of signal quality of the downlink signals from the plurality of base stations to the mobile station and selects a base station from which the downlink signal shows a preferred signal quality. The mobile station transmits an uplink signal indicating the selected base station among the plurality of base stations for subsequent communications with the mobile station. Each base station processes the uplink signal to identify the selected base station from among the plurality of base stations.Type: GrantFiled: January 11, 2002Date of Patent: December 2, 2003Assignee: Fujitsu LimitedInventor: Behzad Mohebbi
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Patent number: 6636735Abstract: In a cellular mobile communications network a mobile station is capable of receiving a downlink signal from each of a plurality of base stations and transmitting an uplink signal to the plurality of the base stations through a wireless channel. The mobile station produces a measure of signal quality of the downlink signals from the plurality of base stations to the mobile station and selects a base station from which the downlink signal shows a preferred signal quality. The mobile station transmits an uplink signal indicating the selected base station among the plurality of base stations for subsequent communications with the mobile station. Each base station processes the uplink signal to identify the selected base station from among the plurality of base stations.Type: GrantFiled: January 11, 2002Date of Patent: October 21, 2003Assignee: Fujitsu LimitedInventor: Behzad Mohebbi
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Publication number: 20030186653Abstract: In a cellular mobile communications network a mobile station is capable of receiving a downlink signal from each of a plurality of base stations and transmitting an uplink signal to the plurality of base stations through a wireless channel. A transmission property of the downlink signals from the plurality of base stations to the mobile station is measured, and decided, in dependence upon the measure of the transmission property, a preferred base station transmitting the downlink signal with a preferred transmission property among the plurality of the base stations. The mobile station includes, in the uplink signal, data indicating the preferred base station(s) for transmitting the subsequent downlink signal to the mobile station. The base stations receiving the uplink signal identify from the data the preferred based station(s) and only the base station(s) identified as the preferred base station(s) transmits a subsequent downlink signal to the mobile station.Type: ApplicationFiled: March 18, 2003Publication date: October 2, 2003Inventors: Behzad Mohebbi, Michael John Shearme