Patents by Inventor Anand Dabak
Anand Dabak 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).
-
Publication number: 20120056841Abstract: A touch screen system includes a capacitive touch screen (1) including a plurality of row conductors (7-1,2 . . . n) and a column conductor (5-1). A plurality of cotemporaneous orthogonal excitation signals (S1(t), S2(t) . . . Sn(t)) are simultaneously driven onto the row conductors, respectively. The capacitively coupled signals on the column conductor may be influenced by a touch (10) on the capacitive touch screen. Receiver circuitry (50) includes a sense amplifier (21-1) coupled to generate an amplifier output signal (r1(t)) in response to signals capacitively coupled onto the column conductor. WHT-based circuitry (35) determines amounts of signal contribution capacitively coupled by each of the excitation signals, respectively, to the amplifier output signal.Type: ApplicationFiled: September 2, 2010Publication date: March 8, 2012Inventors: William R. Krenik, Anand Dabak
-
Publication number: 20120033722Abstract: Embodiments of the invention provide time-domain link adaptation in power line communications. In one embodiment, the cyclic prefix length and position is adjusted with an OFDM symbol to overlap a periodic impulse noise pulse, thereby allowing the data carried in the symbol to be detected at a receiver. The cyclic prefix may be adjusted to provide a pattern that yields an integer number of OFDM symbols in one zero crossing period. The data rate used for the symbols overlapping the zero-crossing period may be zero or very low. A high data rate may be used for symbols outside the zero-crossing period because those symbols will not be affected by the periodic impulse noise.Type: ApplicationFiled: July 8, 2011Publication date: February 9, 2012Applicant: TEXAS INSTRUMENTS INCORPORATEDInventors: Badri Varadarajan, Anand Dabak, Il Han Kim
-
Publication number: 20120002714Abstract: Systems and methods are disclosed for communicating on a pilot wire between Electric Vehicle Service Equipment (EVSE) and an Electric Vehicle (EV). The EVSE and EV exchange a Pulse Width Modulation (PWM) signal on the pilot wire to control charging operations of the EV. Data communications may also be transmitted on the pilot wire, such as between transmit and receive modems. The modems transmit communication signals either continuously, without regard to the state of the PWM signal, or only when the PWM is in an off-state. If transmitting while PWM is on, the modem needs a large coupling impedance and/or a large signal injection. To transmit only when the PWM is off, the modem may use a blocking diode in the coupling circuit or may synchronize to the pulses in the PWM signal.Type: ApplicationFiled: June 17, 2011Publication date: January 5, 2012Applicant: TEXAS INSTRUMENTS INCORPORATEDInventors: Badri N. Varadarajan, Il Han Kim, Anand Dabak, Edward Mullins
-
Publication number: 20110280261Abstract: Embodiments of the invention provide an interleaver design and header fields for ITU-T G.hnem. The header may comprise two parts that are separately encoded. A common header segment is encoded alone, and an embedded header segment is encoded with payload data. The interleaver operates on blocks having a size based upon a total number of input bits in an FEC codeword block, a total number of bits loaded on symbols that span a half mains cycle, or a maximum fragment size of 3072 bits. The blocks may be repeated before interleaving. Each block and its repetitions may be interleaved together, such as for header data, or each block and repetition may be interleaved separately, such as for payload data. Cyclic padding may be used on each block to create an integer number of symbols for transmission.Type: ApplicationFiled: May 5, 2011Publication date: November 17, 2011Applicant: TEXAS INSTRUMENTS INCORPORATEDInventors: Badri N. Varadarajan, Anand Dabak, Il Han Kim
-
Patent number: 8040986Abstract: A system comprises a wireless device that communicates across a spectrum having a plurality of sub-channels. The wireless device comprises a plurality of antennas through which the wireless device communicates with another wireless device, wherein each antenna communicates with the other wireless device via an associated communication pathway. The wireless device further comprises sub-channel power analysis logic coupled to the antennas and adapted to determine which communication pathway has the highest communication quality on a sub-channel by sub-channel basis. The wireless device still further comprises diversity selection logic coupled to the sub-channel power analysis logic and adapted to determine a weighting vector for an associated antenna based on the communication quality, wherein the weighting vector specifies a relative transmission power for each sub-channel for the associated antenna.Type: GrantFiled: November 26, 2003Date of Patent: October 18, 2011Assignee: Texas Instruments IncorporatedInventors: Michael O. Polley, Donald P. Shaver, Srinath Hosur, Eko Onggosanusi, Muhammad Z. Ikram, Anand Dabak
-
Patent number: 7941164Abstract: A cellular communicating device (10). The device comprises means (221) for communicating bi-directional data to and from a cellular transceiver station along a bi -directional channel (30S). The device also comprises means (222) for receiving SPS information. The device also comprises means (223) for receiving broadcast Doppler information from a source other than the bi-directional channel and an SPS system. Lastly, the device also comprises means (24) for determining a location fix of the electronic device in response to the SPS information and the broadcast Doppler information.Type: GrantFiled: February 28, 2005Date of Patent: May 10, 2011Assignee: Texas Instruments IncorporatedInventors: Eko Onggosanusi, Anand Dabak
-
Patent number: 7933342Abstract: Interference rejection (85) can be applied to a wireless communication signal with reduced computational complexity by producing from a sample vector (y) a plurality of vectors (w) that are smaller than the sample vector. The interference rejection operation can then be applied to each of the smaller vectors individually to decide communication symbols represented by the sample vector.Type: GrantFiled: June 17, 2002Date of Patent: April 26, 2011Assignee: Texas Instruments IncorporatedInventors: Tarik Muharemovic, Eko Onggosanusi, Anand Dabak
-
Patent number: 7929416Abstract: A receiver in an OFDM based communication system is adapted to perform channel estimation using a received reference signal transmitted from at least one antenna The reference signal is substantially located into at least two OFDM symbols of a transmission time interval comprising of more than two OFDM symbols. A power level of said reference signal is divided into said non-consecutive OFDM symbols in said transmission time interval and adapted to use the reference signal located in a first OFDM symbol in succeeding transmission time intervals in addition to the reference symbols in a current transmission time interval and a preceding transmission time interval.Type: GrantFiled: December 16, 2009Date of Patent: April 19, 2011Assignee: Texas Instruments IncorporatedInventors: Aris Papasakellariou, Timothy M. Schmidl, Eko N. Onggosanusi, Anand Dabak
-
Publication number: 20100272192Abstract: A device for communicating digital data over power lines includes a power line interface for transmitting data over at least one band of frequencies. An orthogonal frequency division multiplexing (OFDM) modulation unit generates OFDM symbols using a set of tones for the frequency band. A preamble generation unit generates preamble sequences for the frequency band by using the set of tones used by the OFDM modulation unit. The tones used by the preamble generation unit have a constant magnitude, and a set of phases obtained by quantizing to a small alphabet the phase of a set of tones obtained by taking an IFFT of a portion of a preamble used by a non-interoperable powerline access device. The device may transmit on two or more bands using a sampling frequency clock, wherein a lower band clock frequency is equal to or an integer divisor of a higher band clock frequency.Type: ApplicationFiled: April 27, 2010Publication date: October 28, 2010Inventors: Badri Varadarajan, Anand Dabak, Shu Du, Il Han Kim
-
Publication number: 20100124297Abstract: Embodiments of the invention provide a receiver in an OFDM based communication system adapted to perform channel estimation using a received reference signal transmitted from at least one antenna, said reference signal being substantially located into two OFDM symbols of a transmission time interval comprising of more than two OFDM symbols. A method of generating pilot structure, the pilot structure provides information to an apparatus for channel estimation in the OFDM system with a transmission time interval of seven OFDM symbols. The pilot structure comprising pilot signals from at least one transmitting antenna located in various OFDM symbols of the transmission time interval.Type: ApplicationFiled: December 16, 2009Publication date: May 20, 2010Applicant: TEXAS INSTRUMENTS INCORPORATEDInventors: Aris Papasakellariou, Timothy M. Schmidl, Eko N. Onggosanusi, Anand Dabak
-
Patent number: 7698616Abstract: A Hybrid Automatic Retransmission Request (H-ARQ) technique is provided for Multi-Input Multi-Output (MIMO) systems. The technique changes the basis (V) upon retransmission, which helps reduce the error probability upon retransmission. This basis hopping technique provides for improved performance gain without significant increase in design complexity. In one embodiment, communication device (100) includes a receiver section (114) for receiving an acknowledgment (ACK) or a non-acknowledgment (NACK) signal in response to information transmitted by the transmitter section of the communication device. If a NACK is received, a new basis is selected from a set of basis stored in a basis set unit (110). The new basis that is selected is then used by a linear transformation unit (106) in the retransmission of the information.Type: GrantFiled: October 2, 2008Date of Patent: April 13, 2010Assignee: Texas Instruments IncorporatedInventors: Eko Onggosanusi, Yan Hui, Anand Dabak, Gibong Jeong
-
Patent number: 7668564Abstract: Embodiments of the invention provide embodiments of the invention provide and method, network entity and user equipment for slow uplink power control of user equipment in a wireless communication system by responding to a long term control metric that is derived from an uplink channel metric over a plurality of transmission instances and a set of performance criteria. A method for slow uplink power control in accordance with and embodiment of the invention measures at least one uplink channel metric for user equipment and then determines an appropriate transmit power for the user equipment by using a control metric derived from the uplink channel metric corresponding to a plurality of transmission instances for the user equipment.Type: GrantFiled: June 20, 2006Date of Patent: February 23, 2010Assignee: Texas Instruments IncorporatedInventors: Eko N. Onggosanusi, Timothy A. Schmidl, Aris Papasakellariou, Anand Dabak
-
Patent number: 7660229Abstract: Embodiments of the invention provide method and apparatus for generating a structure in an orthogonal frequency division multiplexing OFDM communication system having a transmitter with one or more transmitting antennas. The method includes composing a frame with a time domain and a frequency domain. The frame has a transmission time interval in the time domain and occupies a bandwidth in the frequency domain. The transmission time interval has multiple orthogonal frequency division multiplexing symbols. A pilot signal is located from a transmitting antenna into two non-consecutive orthogonal frequency division multiplexing symbols of the frame.Type: GrantFiled: June 19, 2006Date of Patent: February 9, 2010Assignee: Texas Instruments IncorporatedInventors: Aris Papasakellariou, Timothy A Schmidl, Eko N Onggosanusi, Anand Dabak
-
Patent number: 7634020Abstract: System and method for simplifying preamble detection and reducing power consumption in receivers. A preferred embodiment comprises a preamble made up of two sequences, a first sequence that is specified in the time domain and a second sequence that is specified in the frequency domain. The first sequence which comprises multiple copies of a time domain code sequence can allow easy detection of the preamble while the second sequence comprises multiple copies of a frequency domain code sequence and allows easy determination of the frequency response of the communications channel. A hierarchical sequence can be used to allow multi-stage correlation. This can result in a less complex correlator, hence lower power consumption. Piconets can use different code sequences to allow rapid determination of the source of a transmission without requiring the receiver to decode the entire transmission.Type: GrantFiled: February 19, 2004Date of Patent: December 15, 2009Assignee: Texas Instruments IncorporatedInventors: Anuj Batra, Jaiganesh Balakrishnan, Anand Dabak
-
Patent number: 7565111Abstract: A receiver (MST) for use in a modulated communications system wherein data is communicated in a time-slotted format. The receiver comprises circuitry (22) for providing samples of a group of data from the time-slotted format and circuitry (46, 42) for determining a first set of channel estimates in response to a first set of the samples. The receiver also comprises circuitry (30) for first predicting decisions for data in the group of data in response to the first set of channel estimates and circuitry (46, 42) for determining a second set of channel estimates in response to the predicted decisions. Lastly, the circuitry for predicting is further for second predicting decisions for data in the group of data in response to the second set of channel estimates.Type: GrantFiled: October 18, 2004Date of Patent: July 21, 2009Assignee: Texas Instruments IncorporatedInventors: Eko Onggosanusi, Anand Dabak, Timothy Schmidl
-
Publication number: 20080192678Abstract: Apparatus and method for accessing a wireless telecommunications network by transmitting a random access signal. The random access signal includes a cyclic prefix signal and a guard interval. The cyclic prefix signal and the guard interval are adapted to optimize random access channel coverage in a telecommunications cell. The disclosed method for transmitting a random access signal includes transmitting a cyclic prefix signal. The duration of the cyclic prefix signal is approximately the sum of a maximum round trip delay duration of the telecommunications cell and a maximum delay spread duration. The method further includes providing a guard interval. The guard interval duration being approximately the duration of the maximum round trip delay of the telecommunications cell.Type: ApplicationFiled: August 3, 2007Publication date: August 14, 2008Applicant: TEXAS INSTRUMENTS INCORPORATEDInventors: Pierre BERTRAND, Anand DABAK, Jing JIANG
-
Patent number: 7369523Abstract: A method described evaluates the pilot-to-data power ratio based on the values of the demodulated data at the output of a receiver such as a conventional maximal ratio combiner or an equalizer receiver. Since the data are not scaled to their particular decision grid, their distribution and statistics deviate from the ones defined by the known decision grid. Measuring these deviations of the statistics, the pilot-to-data power ratio and the appropriate demodulated data scaling can be accurately determined. Subsequent data processing may then commence.Type: GrantFiled: February 20, 2003Date of Patent: May 6, 2008Assignee: Texas Instruments IncorporatedInventors: Aris Papasakellariou, Timothy Schmidl, Anand Dabak
-
Publication number: 20080089455Abstract: System and method for interference cancellation in a digital wireless communications system. A preferred embodiment comprises sampling a received signal wherein the received signal is real-valued, rotating the sampled received signal by a specified amount, extracting in-phase and quadrature phase streams from the rotated, sampled received signal, applying an interference suppression filter and combining the filtered streams. The output of the combining operation can be de-correlated (by whitening) if there is excessive correlation.Type: ApplicationFiled: October 31, 2007Publication date: April 17, 2008Inventors: Eko Onggosanusi, Anand Dabak, Timothy Schmidl
-
Publication number: 20080069255Abstract: An efficient bit interleaving scheme for a multi-band OFDM ultra-wideband (UWB) system. The encoded bits of the multi-band OFDM system are interleaved within each OFDM symbol and across OFDM symbols. The bit interleaving scheme minimizes performance degradation due to groups of contiguous OFDM tones experiencing a poor SNR caused by the frequency selective channel, exploits the frequency diversity across sub-bands, randomizes the effect of co-channel interference from simultaneously operating un-coordinated piconets, and randomizes the impact of generic narrow-band interferers present within the UWB spectrum.Type: ApplicationFiled: November 13, 2007Publication date: March 20, 2008Applicant: TEXAS INSTRUMENTS INCORPORATEDInventors: Jaiganesh Balakrishnan, Anuj Batra, Anand Dabak
-
Publication number: 20070165699Abstract: A wireless communication system (10). The system comprises a user station (12). The user station comprises despreading circuitry (22) for receiving and despreading a plurality of slots received from at least a first transmit antenna (A121) and a second transmit antenna (A122) at a transmitting station (14). Each of the plurality of slots comprises a first channel (DPCH) comprising a first set of pilot symbols and a second channel (PCCPCH) comprising a second set of pilot symbols. The user station further comprises circuitry (50) for measuring a first channel measurement (?1,n) for each given slot in the plurality of slots from the first transmit antenna and in response to the first set of pilot symbols in the given slot. The user station further comprises circuitry (50) for measuring a second channel measurement (a2,n) for each given slot in the plurality of slots from the second transmit antenna and in response to the first set of pilot symbols in the given slot.Type: ApplicationFiled: March 1, 2007Publication date: July 19, 2007Inventors: Anand Dabak, Eko Onggosanusi