Patents by Inventor Sumeet Sandhu

Sumeet Sandhu 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: 20090245405
    Abstract: A multiple-input-multiple output (MIMO) transmitter for transmitting a group of sequential orthogonal frequency division multiplexed (OFDM) symbols on a time-division duplexed (TDD) channel in accordance with an IEEE 802.16 standard using a plurality of antennas. The MIMO transmitter comprises a spatial-frequency parser to parse a block of bits into spatial-frequency blocks of a variable number of coded bits, and subcarrier modulators to individually modulate OFDM subcarriers with the spatial-frequency blocks in accordance with spatial-frequency subcarrier modulation assignments to generate groups of symbol-modulated subcarriers. The TDD channel comprises a plurality of the groups of the OFDM subcarriers, and the OFDM subcarriers within each group of subcarriers and within each group of sequential OFDM symbols have the same spatial-frequency subcarrier modulation assignments.
    Type: Application
    Filed: June 11, 2009
    Publication date: October 1, 2009
    Inventors: John S. Sadowsky, Minnie Ho, Sumeet Sandhu, Alexander A. Maltsev, Eric A. Jacobsen, Ali S. Sadri
  • Publication number: 20090232229
    Abstract: Device, system, and method of resource allocation in a wireless network. Embodiments include optimal space-frequency architectures for very high peak rates in wireless systems. For example, an apparatus for wireless communication in a power-limited, very wideband system includes a wireless communication device having a media access controller (MAC) and a physical layer (PHY) that are adapted for a multiple-input-multiple-output (MIMO) orthogonal frequency-division multiple access (OFDMA) communication scheme; a plurality of antennas, operationally coupled to said device, to send and receive wireless communication signals according to the MIMO-OFDMA communication scheme; and a resource allocator, to allocate transmission resources of the device into desired MIMO channels optimized according to at least one of signal-to-noise ratio (SNR), bandwidth, number of users, and signal-to-noise-plus-interference ratio (SINR).
    Type: Application
    Filed: March 17, 2008
    Publication date: September 17, 2009
    Inventors: Sumeet Sandhu, Feng Xue
  • Patent number: 7573946
    Abstract: An apparatus and associated methods for performing space-frequency interleaving in a multicarrier wireless communication system is generally described.
    Type: Grant
    Filed: December 31, 2003
    Date of Patent: August 11, 2009
    Assignee: Intel Corporation
    Inventor: Sumeet Sandhu
  • Patent number: 7570698
    Abstract: A multicarrier transmitter performs bit-interleaving suitable for transmitting more than one spatial stream over a multicarrier communication channel. The multicarrier transmitter may include a bit-grouping shifter to shift QAM symbol-bit groupings of a spatial stream among subcarriers of the multicarrier communication signal, and a bit-position permuter to rotate bits among bit positions within subgroupings of the QAM symbol-bit groupings of the second spatial stream.
    Type: Grant
    Filed: November 16, 2004
    Date of Patent: August 4, 2009
    Assignee: Intel Corporation
    Inventors: William J. Chimitt, Stanley K. Ling, Sumeet Sandhu
  • Publication number: 20090147879
    Abstract: Briefly, in accordance with one embodiment of the invention, a wireless communication system may adaptively switch between a multiple input, multiple output mode and a spatial division, multiple access mode based at least in part on channel conditions and traffic conditions.
    Type: Application
    Filed: November 26, 2008
    Publication date: June 11, 2009
    Inventor: Sumeet Sandhu
  • Patent number: 7539463
    Abstract: A system, apparatus, method and article to manage diversity for a wireless multicarrier communication system are described. An apparatus may include a diversity agent to couple to a transmitter, the diversity agent to convert a determined number of input bits into symbols, interleave the symbols across multiple spatial streams, and map the symbols to tones for each spatial stream. Other embodiments are described and claimed.
    Type: Grant
    Filed: March 30, 2005
    Date of Patent: May 26, 2009
    Assignee: Intel Corporation
    Inventors: Nageen Himayat, Sumeet Sandhu
  • Patent number: 7539270
    Abstract: An encoded input bit stream is interleaved across a number of symbols having different bit sizes in a manner that ensures that the bits assigned to each symbol from the bit stream are separated by a minimum separation. In this manner, bits that are adjacent within the bit stream do not get assigned to the same symbol.
    Type: Grant
    Filed: September 30, 2004
    Date of Patent: May 26, 2009
    Assignee: Intel Corporation
    Inventor: Sumeet Sandhu
  • Patent number: 7529307
    Abstract: An interleaver and scheme for interleaving in which highly correlated bits are maximally separated. The scheme involves interleaving a set of bits to be delivered to a modulation system that utilizes a quantity of N carrier frequencies. A first block of N consecutive bits is assigned to each of N bins, on a one-bit-per-one-bin basis. The aforementioned assignment proceeds in a particular sequence. A second block of N consecutive bits is assigned to each of the N bins, on a one-bit-per-one-bin basis. The second block is assigned in the same sequence the first block was assigned. The second block is consecutive to the first block.
    Type: Grant
    Filed: March 30, 2005
    Date of Patent: May 5, 2009
    Assignee: Intel Corporation
    Inventors: Sumeet Sandhu, David Cheung
  • Patent number: 7515541
    Abstract: Briefly, in accordance with one embodiment of the invention, a transmitter may adaptively select between a post-data channel feedback system and a pre-data channel feedback system based at least in part on packet length and channel conditions.
    Type: Grant
    Filed: December 16, 2003
    Date of Patent: April 7, 2009
    Assignee: Intel Corporation
    Inventor: Sumeet Sandhu
  • Publication number: 20090034644
    Abstract: In a wireless local area network (WLAN) that includes high-throughput communication devices with multiple antennas and legacy communication devices with single antennas, training tones are transmitted over a plurality of spatial channels during a first portion of an orthogonal frequency division multiplexed (OFDM) packet-training preamble. The training tones are interspersed among subcarrier frequencies of the spatial channels. The training tones are retransmitted during a second portion of the packet-training preamble. The training tones are shifted among the subcarrier frequencies of the spatial channels during the retransmission allowing a high-throughput receiving station to perform a channel estimation on different subcarrier frequencies of the spatial channels. The legacy communication devices may receive and process the training tones and may set their network allocation vector to refrain from communicating during a subsequent interval.
    Type: Application
    Filed: October 3, 2008
    Publication date: February 5, 2009
    Inventor: Sumeet Sandhu
  • Patent number: 7460494
    Abstract: Briefly, in accordance with one embodiment of the invention, a wireless communication system may adaptively switch between a multiple input, multiple output mode and a spatial division, multiple access mode based at least in part on channel conditions and traffic conditions.
    Type: Grant
    Filed: October 20, 2003
    Date of Patent: December 2, 2008
    Assignee: Intel Corporation
    Inventor: Sumeet Sandhu
  • Patent number: 7450489
    Abstract: In a wireless local area network (WLAN) that includes high-throughput communication devices with multiple antennas and legacy communication devices with single antennas, training tones are transmitted over a plurality of spatial channels during a first portion of an orthogonal frequency division multiplexed (OFDM) packet-training preamble. The training tones are interspersed among subcarrier frequencies of the spatial channels. The training tones are retransmitted during a second portion of the packet-training preamble. The training tones are shifted among the subcarrier frequencies of the spatial channels during the retransmission allowing a high-throughput receiving station to perform a channel estimation on different subcarrier frequencies of the spatial channels. The legacy communication devices may receive and process the training tones and may set their network allocation vector to refrain from communicating during a subsequent interval.
    Type: Grant
    Filed: December 30, 2003
    Date of Patent: November 11, 2008
    Assignee: Intel Corporation
    Inventor: Sumeet Sandhu
  • Patent number: 7447268
    Abstract: Subcarrier phase rotation is implemented in an OFDM transmitting apparatus to overcome problems such as, for example, non-frequency selective multipath fading. In at least one embodiment, subcarrier phase rotation is practiced in an OFDM system implementing multiple input multiple output (MIMO) techniques.
    Type: Grant
    Filed: March 31, 2004
    Date of Patent: November 4, 2008
    Assignee: Intel Corporation
    Inventors: John S. Sadowsky, Shmuel Levy, Sumeet Sandhu, Keith Holt
  • Patent number: 7440510
    Abstract: A multicarrier transmitter includes a space-frequency interleaver and a space-frequency coder to encode multicarrier signals for transmission over a plurality of spatial channels.
    Type: Grant
    Filed: June 28, 2004
    Date of Patent: October 21, 2008
    Assignee: Intel Corporation
    Inventors: Sumeet Sandhu, Lei Shao
  • Publication number: 20080253471
    Abstract: In an orthogonal frequency division multiplexed (OFDM) system, a transmitter and/or receiver communicate separate data streams on non-orthogonal spatial channels. Each spatial channel may use the same set of OFDM subcarriers and may take advantage of the multipath characteristics of the spatial channel allowing the communication of additional data without an increase in frequency bandwidth. Space-frequency subcarrier modulation assignments may be dynamically assigned on a per subcarrier basis as well as a per spatial channel basis to help maximize the data-carrying capacity of the channel. In some embodiments, each of the spatial channels may be associated with one of a plurality of spatially diverse antennas. In other embodiments, beamforming may be performed to allow the transmission and/or reception of signals within the spatial channels.
    Type: Application
    Filed: May 12, 2008
    Publication date: October 16, 2008
    Inventors: John S. Sadowsky, Minnie Ho, Sumeet Sandhu, Alexander A. Maltsev, Eric A. Jacobsen, Ali S. Sadri
  • Patent number: 7436903
    Abstract: A multicarrier transmitter may transmit cyclically delayed linear combinations of two or more data streams with three or more antennas. In some embodiments, the multicarrier transmitter may transmit cyclically delayed linear combinations of three data streams with four antennas.
    Type: Grant
    Filed: September 29, 2004
    Date of Patent: October 14, 2008
    Assignee: Intel Corporation
    Inventors: Sumeet Sandhu, Minnie Ho
  • Publication number: 20080240054
    Abstract: Methods, apparatuses and systems for communicating in a wireless network are disclosed. One embodiment includes a method for communication in a wireless network that comprises scheduling relay transmissions by stations in separate cells of the wireless network based on out-of-cell interference. The method may also include transmitting data by one or more wireless nodes within the wireless network using orthogonal downlink frame formats and uplink frame formats that prevent a first station of a particular class from transmitting while a separate, second station of the particular class is listening. Other embodiments are disclosed and claimed.
    Type: Application
    Filed: March 30, 2007
    Publication date: October 2, 2008
    Inventors: Sumeet Sandhu, Chris Knudsen
  • Publication number: 20080239977
    Abstract: Methods and arrangements for wireless communications are contemplated. Embodiments include transformations, code, state machines or other logic to determine the signal to noise ratios (SNRs) of multiple stations associated with an access point in a wireless network. The embodiments may also include selecting whether one of the stations communicates with the access point by an orthogonal frequency division multiplexing (OFDM) transmission method or a multiple-access joint coding/decoding transmission method, the selecting based upon the SNRs and communicating the selected transmission method to the station of the multiple stations. Some embodiments may include determining an SNR threshold level, selecting the MAC transmission method if the SNR of at least one of the multiple stations is below the SNR threshold level, and selecting the OFDM transmission method if the SNRs of all of the multiple stations are above the SNR threshold level. Other embodiments are described and claimed.
    Type: Application
    Filed: March 30, 2007
    Publication date: October 2, 2008
    Inventors: Feng Xue, Jun Shi, Sumeet Sandhu
  • Publication number: 20080240018
    Abstract: Methods, apparatuses and systems for communicating in a wireless network are disclosed. One embodiment includes a method for communication in a wireless network that comprises determining a signal-to-noise ratio (SNR) for channels between a base station, one or more relay stations, and a user and selecting a relay station based on the determined SNRs. Embodiments may also include determining a time sharing parameter and a total transmitting time, transmitting by the base station to the selected relay station for a first duration, and transmitting simultaneously by the base station and relay station using multi-access code for a second duration. The simultaneous transmission may be adapted to be decoded utilizing joint decoding with interference cancellation. Other embodiments are disclosed and claimed.
    Type: Application
    Filed: March 29, 2007
    Publication date: October 2, 2008
    Inventors: Feng Xue, Sumeet Sandhu
  • Publication number: 20080219251
    Abstract: A method of transmitting two packets to two different nodes may include encoding a first packet according to a first channel to obtain an encoded first packet and encoding a second packet according to a second channel different than the first channel to obtain an encoded second packet. The encoded first packet and the encoded second packet may be combined to obtain a combined encoded packet. The method may include mapping the combined encoded packet to symbols for transmission. The symbols may be transmitted to the two different nodes over the first channel and the second channel.
    Type: Application
    Filed: March 8, 2007
    Publication date: September 11, 2008
    Inventors: Feng Xue, Sumeet Sandhu