Patents by Inventor Vasanth R. Gaddam

Vasanth R. Gaddam 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: 8773994
    Abstract: A method (200) for signaling a transmission mode in a wireless communication networks comprises selecting a signature sequence corresponding to the transmission mode of a transmitting device (S210); forming, for each antenna in the transmitting device, a synchronization field based on the selected signature sequence, wherein the synchronization field is included in a preamble (S220); and transmitting, from each antenna in the transmitting device, the data frame that comprises the preamble.
    Type: Grant
    Filed: March 24, 2010
    Date of Patent: July 8, 2014
    Assignee: Koninklijke Philips N.V.
    Inventors: Monisha Ghosh, Vasanth R. Gaddam
  • Patent number: 8503488
    Abstract: A packet insertion mechanism at the front end of a time-synchronized digital television transmission system multiplexes, along with standard packets, packets whose payload is to be transmitted with redundancy for added robustness. The multiplexer also inputs placeholder packets to accommodate duplicated content of the robust packets. Multiplexing of the robust and placeholder packets is configured to alternate and to interleave with the multiplexing of standard packets. The distribution of the robust packets within a frame is determined by the number of robust packets.
    Type: Grant
    Filed: September 1, 2003
    Date of Patent: August 6, 2013
    Assignee: Koninklijke Philips N.V.
    Inventors: Vasanth R. Gaddam, Dagnachew Birru
  • Patent number: 8432854
    Abstract: A system includes a first primary wireless system (120) that communicates over a first range, and a first beaconing device (130) associated with the first primary wireless system (120). The first beaconing device (130) communicates over at least at a second range, wherein the second range is greater than the first range. The first beaconing device listens for beacons (510) from other beaconing devices (130) associated with other primary wireless systems (120) on a plurality of channels over which the other primary systems may operate. After listening for beacons from the other beaconing devices (130) associated with other primary wireless systems, the first beaconing device transmits a first beacon (510) to a wireless device (114) of a secondary wireless system (110) that may communicate over the second range. The first beacon includes data indicating an occupation of a first one of the channels by the first primary wireless system (120).
    Type: Grant
    Filed: July 12, 2007
    Date of Patent: April 30, 2013
    Assignee: Koninklijke Philips Electronics N.V.
    Inventors: Carlos Cordeiro, Monisha Ghosh, Vasanth R. Gaddam, Kiran S. Challapali
  • Patent number: 8233862
    Abstract: Wireless microphone signals are detected by processing an input signal to determine a number of frequency bins within a channel frequency band having an energy level above a first predefined threshold (S510); identifying locations of the frequency bins having an energy level above the first predefined threshold, when the number of bins is greater than zero (S520, S530); for each frequency bin having an energy level above the first predefined threshold, processing signals within a narrow frequency band of the frequency bin (S570); determining a number of signal peaks within the narrow frequency band that are above a second predefined threshold (S575); and generating a message indicating a presence or an absence of a microphone signal based on the number of signal peaks (S590, S595).
    Type: Grant
    Filed: February 16, 2009
    Date of Patent: July 31, 2012
    Assignee: Koninklijke Philips Electronics N.V.
    Inventors: Vasanth R. Gaddam, Monisha Ghosh
  • Patent number: 8229003
    Abstract: Transmission of a digital television signal conveys data parameters along with the encoder data that are utilized by the receiver in equalization and in decoding the encoded data. Leveraging the existing digital television standard data formatting, parameters are split between the two fields of a frame of the interlaced signal. Spread spectrum techniques are employed to robustly convey the parameters in encoded form to the receiver.
    Type: Grant
    Filed: September 5, 2003
    Date of Patent: July 24, 2012
    Assignee: Koninklijke Philips Electronics N.V.
    Inventors: Vasanth R. Gaddam, Dagnachew Birru
  • Publication number: 20120039321
    Abstract: A method (200) for signaling a transmission mode in a wireless communication networks comprises selecting a signature sequence corresponding to the transmission mode of a transmitting device (S210); forming, for each antenna in the transmitting device, a synchronization field based on the selected signature sequence, wherein the synchronization field is included in a preamble (S220); and transmitting, from each antenna in the transmitting device, the data frame that comprises the preamble.
    Type: Application
    Filed: March 24, 2010
    Publication date: February 16, 2012
    Applicant: KONINKLIJKE PHILIPS ELECTRONICS N.V.
    Inventors: Monisha Ghosh, Vasanth R. Gaddam
  • Publication number: 20100311341
    Abstract: Wireless microphone signals are detected by processing an input signal to determine a number of frequency bins within a channel frequency band having an energy level above a first predefined threshold (S510); identifying locations of the frequency bins having an energy level above the first predefined threshold, when the number of bins is greater than zero (S520, S530); for each frequency bin having an energy level above the first predefined threshold, processing signals within a narrow frequency band of the frequency bin (S570); determining a number of signal peaks within the narrow frequency band that are above a second predefined threshold (S575); and generating a message indicating a presence or an absence of a microphone signal based on the number of signal peaks (S590, S595).
    Type: Application
    Filed: February 16, 2009
    Publication date: December 9, 2010
    Applicant: KONINKLIJKE PHILIPS ELECTRONICS, N.V.
    Inventors: Vasanth R. Gaddam, Monisha Ghosh
  • Publication number: 20100067428
    Abstract: A system includes a first primary wireless system (120) that communicates over a first range, and a first beaconing device (130) associated with the first primary wireless system (120). The first beaconing device (130) communicates over at least at a second range, wherein the second range is greater than the first range. The first beaconing device listens for beacons (510) from other beaconing devices (130) associated with other primary wireless systems (120) on a plurality of channels over which the other primary systems may operate. After listening for beacons from the other beaconing devices (130) associated with other primary wireless systems, the first beaconing device transmits a first beacon (510) to a wireless device (114) of a secondary wireless system (110) that may communicate over the second range. The first beacon includes data indicating an occupation of a first one of the channels by the first primary wireless system (120).
    Type: Application
    Filed: July 12, 2007
    Publication date: March 18, 2010
    Inventors: Carlos Cordeiro, Monisha Ghosh, Vasanth R. Gaddam, Kiran S. Challapali
  • Publication number: 20100067629
    Abstract: In one embodiment, a TFI-OFDM receiver system (22) is able to more reliably decode the information bits by estimating the noise variance associated with the channel and using these estimates in mitigating in-band interference. In another embodiment, there is a TFI-OFDM receiver system (66) that is able to update the estimated channel impulse response and the noise variance by generating reference OFDM symbols from the received header symbols, the band hopping pattern provided by the TFC number associated with the communication link, the estimated channel impulse response and the noise variance estimates and symbols generated from a FFT processor (30).
    Type: Application
    Filed: November 28, 2007
    Publication date: March 18, 2010
    Applicant: KONINKLIJKE PHILIPS ELECTRONICS, N.V.
    Inventors: Vasanth R. Gaddam, Tianyan Pu, Yifeng Zhang
  • Patent number: 7675994
    Abstract: A flexible digital transmission system that improves upon the ATSC A/53 HDTV signal transmission standard. The system includes a digital signal transmitter for generating a first Advanced Television Systems Committee (ATSC) standard encoded 8-VSB bit stream and, for generating an encoded new robust bit stream for transmitting high priority information bits, wherein symbols of the new bit stream are capable of being transmitted according to a transmission mode including: a 2-VSB mode and a 4-VSB transmission mode. The standard 8-VSB bit stream and new bit stream may be simultaneously transmitted over a terrestrial channel according to a broadcaster defined bit-rate ratio. The transmission system includes a control mechanism for generating information needed for encoding robust packets at a transmitter device. It also includes a mechanism for encoding control parameters and multiplexes the generated information with the standard and robust bit-streams for transmission.
    Type: Grant
    Filed: April 9, 2002
    Date of Patent: March 9, 2010
    Assignee: Koninklijke Philips Electronics N.V.
    Inventors: Vasanth R. Gaddam, Dagnachew Birru
  • Publication number: 20100020732
    Abstract: The present invention provides a system (900), apparatus (700, 800) and method for frames, preambles and control headers for a physical (PHY) layer of the 802.22 WRAN specification. Some of the main features of the present invention include: Superframe and Frame structure; Superframe Preamble (and CBP Preamble); Frame Preamble; Superframe Control Header (SCH); and Frame Control Header (FCH).
    Type: Application
    Filed: September 21, 2007
    Publication date: January 28, 2010
    Applicant: KONINKLIJKE PHILIPS ELECTRONICS, N.V.
    Inventors: Vasanth R. Gaddam, Dagnachew Birru
  • Publication number: 20090323610
    Abstract: A method and system of calculating debt service capacity of a loan applicant includes capturing, indexing, reclassifying and grouping transaction data and profile data of the loan applicant. Next, capturing a loan structure, risk factors, financial variables and reconciliation rules and finally using the aforementioned and loan applicants' data and cash flow projections to calculate loan applicants' debt service capacity with time value of money calculations.
    Type: Application
    Filed: September 21, 2007
    Publication date: December 31, 2009
    Applicant: KONINKLIJKE PHILIPS ELECTRONICS, N.V.
    Inventors: Vasanth R. Gaddam, Dagnachew Birru
  • Publication number: 20090252202
    Abstract: A data transmission and reception method includes transmitting a plurality of position data bits and a amplitude bits with each of the pulses. The method also includes decoding the position bits and the amplitude bits. An ultra-wideband (UWB) system is also described.
    Type: Application
    Filed: December 8, 2005
    Publication date: October 8, 2009
    Applicant: KONINKLIJKE PHILIPS ELECTRONICS, N.V.
    Inventor: Vasanth R. Gaddam
  • Patent number: 7570720
    Abstract: An encoding system is configured to allow data to be transmitted at one of two selectable bit-error-rate quality factors. The first bit-error-rate quality factor selection corresponds to the conventional ATSC FEC encoding systems, and the second bit-error-rate quality factor selection provides an ATSC-like FEC encoding scheme that substantially improves the bit-error-rate. The first quality factor selection effects a 2/3 trellis encoding, whereas the higher quality factor selection effects a 1/3 trellis encoding. Because the high-quality trellis encoding rate of 1/3 is half the lower-quality trellis encoding rate of 2/3, the data rate of this high-quality encoded bit-stream is half that of the conventional lower-quality encoded bit-stream. The 1/3 trellis encoding is effected using an ATSC-compatible encoding and a modified symbol mapping. The encoding scheme provides 2:1 data redundancy and the symbol mapping provides a maximum distance for the redundant encoding.
    Type: Grant
    Filed: March 23, 2004
    Date of Patent: August 4, 2009
    Assignee: Koninklijke Philips Electronics N.V.
    Inventors: Vasanth R. Gaddam, Dave Bryan, Patrick Kelliher
  • Patent number: 7206352
    Abstract: This disclosure describes a flexible digital transmission system that improves upon the ATSC A/53 HDTV signal transmission standard. The system includes a digital television signal transmitter for generating a first Advanced Television Systems Committee (ATSC) standard 8-VSB bit stream and, for generating an encoded new bit stream capable of transmitting high priority information bits, wherein symbols of the new bit stream are capable of being transmitted according to a transmission mode selected from group comprising: a 2-VSB mode, a 4-VSB mode, and a hierarchical-VSB (H-VSB) transmission mode. Each respective 2-VSB, 4-VSB, and H-VSB mode is characterized as having symbols mapped according to possible symbol values from an alphabet comprising respectively, {?7, ?5, 5, 7}, {7, 3, ?3, ?7}, and {7, 5, 3, ?3, ?5, ?7}. The standard 8-VSB bit stream and new bit stream may be simultaneously transmitted over a terrestrial channel according to a broadcaster defined bit-rate ratio.
    Type: Grant
    Filed: February 19, 2002
    Date of Patent: April 17, 2007
    Assignee: Koninklijke Philips Electronics N.V.
    Inventors: Dagnachew Birru, Vasanth R. Gaddam, Monisha Ghosh
  • Patent number: 7111221
    Abstract: A transmission system includes a first forward error correction unit, a robust processor unit, a trellis encoder unit, a second forward error correction unit, and a transmitter device. The first forward error correction unit encodes packets belonging to robust and normal bit streams. The robust processor unit receives the encoded robust packets and processes the robust packets to generate the robust bit stream. The trellis encoder unit produces a stream of trellis encoded data bits corresponding to bits of the normal and robust bit streams by mapping encoded data bits of the robust packets into symbols according to one or more symbol mapping schemes. The second forward error correction unit reads in only packets of the robust bit stream and enables generation of parity bytes only for the robust packets. The transmitter device transmits the robust bit stream over a communications channel to a receiver device.
    Type: Grant
    Filed: April 22, 2002
    Date of Patent: September 19, 2006
    Assignee: Koninklijke Philips Electronics N.V.
    Inventors: Dagnachew Birru, Vasanth R. Gaddam
  • Publication number: 20040181743
    Abstract: An encoding system is configured to allow data to be transmitted at one of two selectable bit-error-rate quality factors. The first bit-error-rate quality factor selection corresponds to the conventional ATSC FEC encoding systems, and the second bit-error-rate quality factor selection provides an ATSC-like FEC encoding scheme that substantially improves the bit-error-rate. The first quality factor selection effects a 2/3 trellis encoding, whereas the higher quality factor selection effects a 1/3 trellis encoding. Because the high-quality trellis encoding rate of 1/3 is half the lower-quality trellis encoding rate of 2/3, the data rate of this high-quality encoded bit-stream is half that of the conventional lower-quality encoded bit-stream. The 1/3 trellis encoding is effected using an ATSC-compatible encoding and a modified symbol mapping. The encoding scheme provides 2:1 data redundancy and the symbol mapping provides a maximum distance for the redundant encoding.
    Type: Application
    Filed: March 23, 2004
    Publication date: September 16, 2004
    Inventors: Vasanth R. Gaddam, Dave Bryan, Patrick Kelliher
  • Patent number: 6744822
    Abstract: An encoding system is configured to allow data to be transmitted at one of two selectable bit-error-rate quality factors. The first bit-error-rate quality factor selection corresponds to the conventional ATSC FEC encoding systems, and the second bit-error-rate quality factor selection provides an ATSC-like FEC encoding scheme that substantially improves the bit-error-rate. The first quality factor selection effects a ⅔ trellis encoding, whereas the higher quality factor selection effects a ⅓ trellis encoding. Because the high-quality trellis encoding rate of ⅓ is half the lower-quality trellis encoding rate of ⅔, the data rate of this high-quality encoded bit-stream is half that of the conventional lower-quality encoded bit-stream. The ⅓ trellis encoding is effected using an ATSC-compatible encoding and a modified symbol mapping. The encoding scheme provides 2:1 data redundancy and the symbol mapping provides a maximum distance for the redundant encoding.
    Type: Grant
    Filed: August 14, 2000
    Date of Patent: June 1, 2004
    Assignee: Koninklijke Philips Electronics N.V.
    Inventors: Vasanth R. Gaddam, Dave Bryan, Patrick Kelliher
  • Publication number: 20030099303
    Abstract: A digital signal transmission system transmits MPEG data packets including normal packets for transmission as a normal bit stream and robust packets comprising information for transmission as a robust bit stream for receipt by a receiver device. A first encoding device is provided for encoding packets belonging to each robust and normal bit streams. A control device tracks individual bytes belonging to the robust and normal bit streams. A formatter device formats tracked bytes of packets belonging to the robust bit stream and, a trellis encoder device produces a stream of trellis encoded bits corresponding to bits of the normal and robust streams. The trellis encoder additionally maps the trellis encoded bits of both robust and normal bytes into symbols. A second encoding device responsive to the control device applies a non-systematic Reed Solomon encoding to formatted packets belonging to the robust bit stream when a backward compatibility mode is indicated.
    Type: Application
    Filed: May 9, 2002
    Publication date: May 29, 2003
    Applicant: KONINKLIJKE PHILIPS ELECTRONICS N.V.
    Inventors: Dagnachew Birru, Vasanth R. Gaddam
  • Publication number: 20020194570
    Abstract: A digital transmission system and method that improves upon the ATSC A/53 HDTV signal transmission standard includes: a first forward error correction (FEC) unit for encoding packets belonging to each of robust and normal data bit streams; a robust processor unit for receiving robust packets comprising priority data and processing the packets for generating the robust bit stream; a trellis encoder unit for producing a stream of trellis encoded data bits corresponding to bits of the normal and robust streams, the encoder employing mapping of encoded data bits of said robust packets into symbols according to one or more symbol mapping schemes; and, an optional second forward error correction (FEC) encoding unit for ensuring backward compatibility with a receiver device by reading in only packets of the robust bit stream and enabling generation of parity bytes only for the robust stream packets; and, a transmitter device for transmitting the robust bit streams in a backwards compatible manner, separately or in c
    Type: Application
    Filed: April 22, 2002
    Publication date: December 19, 2002
    Applicant: Koninklijke Philips Electronics N.V.;
    Inventors: Dagnachew Birru, Vasanth R. Gaddam