Patents by Inventor Sinan Gezici
Sinan Gezici 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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Patent number: 9491716Abstract: Provided is a communication control device including a power control unit configured to determine a transmission power of a wireless signal, which is transmitted from an interfering device, by using a fading index that is estimated based on a change in a relative distance between the interfering device and an interfered device.Type: GrantFiled: May 28, 2013Date of Patent: November 8, 2016Assignee: Sony CorporationInventors: Ryo Sawai, Berkan Dulek, Sinan Gezici
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Publication number: 20150156729Abstract: Provided is a communication control device including a power control unit configured to determine a transmission power of a wireless signal, which is transmitted from an interfering device, by using a fading index that is estimated based on a change in a relative distance between the interfering device and an interfered device.Type: ApplicationFiled: May 28, 2013Publication date: June 4, 2015Applicant: Sony CorporationInventors: Ryo Sawai, Berkan Dulek, Sinan Gezici
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Patent number: 8238868Abstract: A dynamic voltage scaling system for a packet-based data communication transceiver includes a constant voltage supply, a variable voltage supply, and a voltage control unit. The constant voltage supply is configured to supply a constant voltage to at least one parameter-independent function of the transceiver, and the variable voltage supply is configured to supply a variable voltage in accordance with a control signal to at least one parameter-dependent function of the transceiver. Parameter-independent transceiver functions perform operations independent of a predetermined parameter and parameter-dependent transceiver functions perform operations dependent on the predetermined parameter The voltage control unit is configured to generate the control signal based on information provided by at least one parameter-independent transceiver function about the predetermined parameter.Type: GrantFiled: May 31, 2007Date of Patent: August 7, 2012Assignee: Renesas Electronics CorporationInventors: Chunjie Duan, Sinan Gezici, Jinyun Zhang, Rajesh Garg
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Patent number: 8111767Abstract: An adaptive sliding block Viterbi decoder (ASBVD) includes forward and backward Viterbi processors, a state estimator and a control unit. The processors generate metrics of states and of transitions between the states associated with an encoder, based on encoded input information symbols received via a communications channel. Each processor includes a plurality of buffers for storing information symbols so that a number of the encoded input information symbols can be concurrently decoded. The state estimator estimates a current state of a code trellis based on the generated metrics, and the processors decode the stored information symbols based on the estimated current state. The control unit adapts the number of encoded input information symbols to be concurrently decoded based on a condition of the communications channel, and selectively controls the number of buffers that are enabled in accordance with the number of encoded input information symbols to be concurrently decoded.Type: GrantFiled: May 31, 2007Date of Patent: February 7, 2012Assignee: Renesas Electronics CorporationInventors: Sinan Gezici, Chunjie Duan, Jinyun Zhang, Rajesh Garg
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Patent number: 8098757Abstract: The present invention provides a method of windowing signals in a communication system. The method includes accessing at least one first signal associated with at least one of a plurality of orthogonal frequencies and applying a window function to the at least one first signal to form at least one second signal. The at least one second signal remains substantially orthogonal to signals associated with the plurality of orthogonal frequencies.Type: GrantFiled: October 21, 2005Date of Patent: January 17, 2012Assignee: Alcatel LucentInventors: Qi Bi, Sinan Gezici, Lei Song, Yifei Yuan
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Patent number: 7817091Abstract: A method estimates a delay in a time of arrival (TOA) of a transmitted signal by receiving the transmitted signal at multiple antennas via corresponding channels. Each received signal is correlated with the transmitted signal to obtain estimated channel coefficients and an estimated TOA. A variance of noise is also obtained for each received signal. A weight is determined for each received signal by dividing the channel coefficients by the variance of the noise. The weights are summed, and each weight is multiplied by the estimated TOA to produce a weighted estimated TOA, which are also summed. The summed weighted estimated TOA are divided by the summed weights to determine a final TOA estimate with respect to the transmitted signal.Type: GrantFiled: February 6, 2008Date of Patent: October 19, 2010Assignee: Mitsubishi Electric Research Laboratories, Inc.Inventors: Sinan Gezici, Zafer Sahinoglu
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Patent number: 7729407Abstract: A transmitted reference ultra-wide band communication signal embodied in an electromagnetic wave and configured to communicate a data value includes a first frame having a first reference pulse and a first data pulse. The first reference pulse has a reference polarity and the first data pulse has a data polarity. The first reference pulse is separated from the first reference pulse by a delay time. The reference polarity is set based on a predetermined reference value and a first pseudo-random polarity code sequence, and the data polarity is set based on the data value and a second pseudo-random polarity code sequence. A receiver configured to receive the signal, a transmitter configured to transmit the signal, and a system of transmitters and receivers are also provided.Type: GrantFiled: February 10, 2005Date of Patent: June 1, 2010Assignee: Renesas Technology Corp.Inventors: Zafer Sahinoglu, Sinan Gezici
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Publication number: 20090195456Abstract: A method estimates a delay in a time of arrival (TOA) of a transmitted signal by receiving the transmitted signal at multiple antennas via corresponding channels. Each received signal is correlated with the transmitted signal to obtain estimated channel coefficients and an estimated TOA. A variance of noise is also obtained for each received signal. A weight is determined for each received signal by dividing the channel coefficients by the variance of the noise. The weights are summed, and each weight is multiplied by the estimated TOA to produce a weighted estimated TOA, which are also summed. The summed weighted estimated TOA are divided by the summed weights to determine a final TOA estimate with respect to the transmitted signal.Type: ApplicationFiled: February 6, 2008Publication date: August 6, 2009Inventors: Sinan Gezici, Zafer Sahinoglu
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Patent number: 7539267Abstract: A method signals in an ultra-wide bandwidth network. A data symbol is generated. A set of reference pulses is transmitted for the data symbol. Each reference pulse is of a different type. One data pulse is also transmitted for each reference pulse. A type of each data pulse is identical to the type of the corresponding reference pulse.Type: GrantFiled: August 20, 2004Date of Patent: May 26, 2009Assignee: Mitsubishi Electric Research Laboratories, Inc.Inventors: Zafer Sahinoglu, Sinan Gezici
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Publication number: 20080298513Abstract: An adaptive sliding block Viterbi decoder (ASBVD) includes forward and backward Viterbi processors, a state estimator and a control unit. The processors generate metrics of states and of transitions between the states associated with an encoder, based on encoded input information symbols received via a communications channel. Each processor includes a plurality of buffers for storing information symbols so that a number of the encoded input information symbols can be concurrently decoded. The state estimator estimates a current state of a code trellis based on the generated metrics, and the processors decode the stored information symbols based on the estimated current state. The control unit adapts the number of encoded input information symbols to be concurrently decoded based on a condition of the communications channel, and selectively controls the number of buffers that are enabled in accordance with the number of encoded input information symbols to be concurrently decoded.Type: ApplicationFiled: May 31, 2007Publication date: December 4, 2008Inventors: Sinan Gezici, Chunjie Duan, Jinyun Zhang, Rajesh Garg
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Publication number: 20080297133Abstract: A dynamic voltage scaling system for a packet-based data communication transceiver includes a constant voltage supply, a variable voltage supply, and a voltage control unit. The constant voltage supply is configured to supply a constant voltage to at least one parameter-independent function of the transceiver, and the variable voltage supply is configured to supply a variable voltage in accordance with a control signal to at least one parameter-dependent function of the transceiver. Parameter-independent transceiver functions perform operations independent of a predetermined parameter and parameter-dependent transceiver functions perform operations dependent on the predetermined parameter The voltage control unit is configured to generate the control signal based on information provided by at least one parameter-independent transceiver function about the predetermined parameter.Type: ApplicationFiled: May 31, 2007Publication date: December 4, 2008Inventors: Chunjie Duan, Sinan Gezici, Jinyun Zhang, Rajesh Garg
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Patent number: 7436909Abstract: A method estimates a time of arrival of a signal received in a wireless communication system. An energy in a frame of a received signal is measured to determine a block in the frame, the block representing a coarse time of arrival of the received signal. Multiple time-delayed versions of a template signal are combined with the block of the received signal to select a particular template signal. The particular template signal identifies a particular chip representing a fine time of arrival of the received signal.Type: GrantFiled: November 15, 2004Date of Patent: October 14, 2008Assignee: Mitsubishi Electric Research Laboratories, Inc.Inventors: Zafer Sahinoglu, Sinan Gezici, Andreas F. Molisch
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Patent number: 7423576Abstract: According to the invention, IEEE 802.15.4a packets are used for communications, ranging and passive radar (detecting changes/motions, tracking objects in the environment) functionality. Changes and motions in the environment are detected by exploiting the specific preamble structure of the IEEE 802.15.4a packets. A sequence of packets transmitted through an environment is received. Each packet includes a preamble. The preamble in each packet is despread to update a reference multipath profile and to obtain a current multipath profile for a currently received packet. The reference multipath profile is compared with the current multipath profile to detect an object in the environment.Type: GrantFiled: July 24, 2006Date of Patent: September 9, 2008Assignee: Mitsubishi Electric Research Laboratories, Inc.Inventors: Zafer Sahinoglu, Sinan Gezici
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Patent number: 7403157Abstract: A method determines a position of a target object. A window function is applied repeatedly to a first signal and a second signal of a pair of radio signals received at a pair of passive sensors from a target object while time shifting the window function during a correlation interval to produce a first windowed signal and a second windowed signal for each application. The first windowed signals are cross-correlating with the second windowed signals to determine a peak for each cross-correlation. The peaks are compared sequentially in time with a predetermined threshold to detect a first pulse in the first signal and a first pulse in the second signal. A delay between the first pulses indicative of a position of the target object.Type: GrantFiled: September 13, 2006Date of Patent: July 22, 2008Assignee: Mitsubishi Electric Research Laboratories, Inc.Inventors: Sinan Gezici, Zafer Sahinoglu, Jinyun Zhang
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Patent number: 7349458Abstract: In a time-hopped impulse radio system, each symbol is transmitted over a channel having different multipath components as a set of Nf frames. Each frame includes one pulse. All frames of a received signal corresponding to the symbol are sampled to generate Nf×L samples, where L is the number of samples for each frame. Then, the Nf×L samples are combined according to a minimum mean square error criterion to obtain a decision variable corresponding to the symbol.Type: GrantFiled: May 17, 2004Date of Patent: March 25, 2008Assignee: Mitsubishi Electric Research Laboratories, Inc.Inventors: Sinan Gezici, Andreas F. Molisch, Hisashi Kobayashi, H. Vincent Poor
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Publication number: 20080062043Abstract: A method determines a position of a target object. A window function is applied repeatedly to a first signal and a second signal of a pair of radio signals received at a pair of passive sensors from a target object while time shifting the window function during a correlation interval to produce a first windowed signal and a second windowed signal for each application. The first windowed signals are cross-correlating with the second windowed signals to determine a peak for each cross-correlation. The peaks are compared sequentially in time with a predetermined threshold to detect a first pulse in the first signal and a first pulse in the second signal. A delay between the first pulses indicative of a position of the target object.Type: ApplicationFiled: September 13, 2006Publication date: March 13, 2008Inventors: Sinan Gezici, Zafer Sahinoglu, Jinyun Zhang
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Publication number: 20080055157Abstract: A method and system detects a target in a cooperative passive radar system. In each of multiple passive sensors, signals are detected that emanate from a target. Information is extracted from the signals and broadcast to other passive sensors. The sensors update parameters according to the information to improve a likelihood of receiving the signals and to increase a probability of detecting the target. The information is also transmitted to a central processor. The central processor determines a position of the target.Type: ApplicationFiled: September 1, 2006Publication date: March 6, 2008Inventors: Zafer Sahinoglu, Sinan Gezici
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Patent number: 7327314Abstract: A method estimates a distance between transceivers in a wireless communications network. A first time interval T is set in a transmitter and a receiver. A signal is transmitted from the transmitter to the receiver at a time t2 according to a first clock of the transmitter. The signal is received in the receiver at a time t3. Processing delays of the receivers are determined. A reply to the signal is sent from the receiver to the transmitter at a time t6 such that |t3?t6|=T. The reply is received in the transmitter at a time t7 of the first clock and a distance d between the transmitter and the receiver is determined according to d=c(|t2?t7|?T)/2, where c is the speed of light.Type: GrantFiled: October 20, 2004Date of Patent: February 5, 2008Assignee: Mitsubishi Electric Research Laboratories, Inc.Inventors: Sinan Gezici, Zafer Sahinoglu
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Publication number: 20080018521Abstract: According to the invention, IEEE 802.15.4a packets are used for communications, ranging and passive radar (detecting changes/motions, tracking objects in the environment) functionality. Changes and motions in the environment are detected by exploiting the specific preamble structure of the IEEE 802.15.4a packets. A sequence of packets transmitted through an environment is received. Each packet includes a preamble. The preamble in each packet is despread to update a reference multipath profile and to obtain a current multipath profile for a currently received packet. The reference multipath profile is compared with the current multipath profile to detect an object in the environment.Type: ApplicationFiled: July 24, 2006Publication date: January 24, 2008Inventors: Zafer Sahinoglu, Sinan Gezici
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Patent number: 7292619Abstract: A method and system acquire a received impulse radio signal by first searching, with respect to time, a region of the impulse radio signal using a first template signal to locate a block including a signal cell, and second searching, with respect to time, the block using a second template signal to locate the signal cell to acquire the received impulse radio signal.Type: GrantFiled: April 30, 2003Date of Patent: November 6, 2007Assignee: Mitsubishi Electric Research LaboratoriesInventors: Andreas Molisch, Sinan Gezici, Hisashi Kobayashi, H. Vincent Poor