Patents by Inventor Sudhir Srinivasa

Sudhir Srinivasa 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: 20210320763
    Abstract: Various embodiments relate to a method for transmitting a Wi-Fi signal using a channel of 80 MHz or wider, wherein each 80 MHz segment has a tone plan, including: determining that a physical 20 MHz sub-channel overlaps the 80 MHz segment or OFDMA transmission is used for the 80 MHz segment; selecting an alternative 80 MHz tone plan; and transmitting data on the 80 MHz segment using the selected alternative 80 MHz tone plan.
    Type: Application
    Filed: March 25, 2021
    Publication date: October 14, 2021
    Inventors: Rui Cao, Sudhir Srinivasa, Hongyuan Zhang
  • Publication number: 20210321388
    Abstract: Communications may be effected in a communications environment involving a plurality channels having disparate bandwidth and channel center frequency indexes. Communications are effected using first communications type with a first channel bandwidth and first channel center frequency index. Communications are also effected via a second communications type using a separate set of fields indicating a second channel bandwidth and a second channel center frequency index, the second channel bandwidth being different than the first channel bandwidth and the second channel center frequency index being different than the first channel center frequency index. The channel center frequency index and bandwidth communicated in each communication may utilize separate subfields.
    Type: Application
    Filed: April 13, 2021
    Publication date: October 14, 2021
    Inventors: Young Hoon Kwon, Liwen Chu, Sudhir Srinivasa, Hongyuan Zhang, Rui Cao
  • Patent number: 11140709
    Abstract: A method for communication in a wireless local area network (WLAN) includes receiving, at first and second access points (APs) in the WLAN, uplink signals from a first client station (STA), which is associated with a basic service set (BSS) of the first AP. First downlink signals are transmitted from the first AP to the first STA using a first steering matrix. Responsively to the received uplink signals, a second steering matrix is computed, having a null in a direction of the first STA. Second downlink signals are transmitted from the second AP to a second STA in the WLAN using the second steering matrix.
    Type: Grant
    Filed: December 5, 2019
    Date of Patent: October 5, 2021
    Assignee: NXP USA, Inc.
    Inventors: B Hari Ram, Nilesh N. Khude, Sri Varsha Rottela, Vijay Ahirwar, Sudhir Srinivasa
  • Patent number: 11140745
    Abstract: A WLAN Access Point (AP) includes a MAC processor and a PHY processor. The MAC processor is configured to generate a trigger frame including user information fields destined to respective STAs, and a padding field including one or more padding bits, to determine a number of padding bits that, after the trigger frame including the padding bats being encoded for transmission, satisfy a processing-time constraint imposed by the STAs, and to insert the determined number of padding bits in the padding field. The PHY processor is configured to generate a packet from the trigger frame, including encoding the trigger frame in accordance with an ECC, into one or more code words whose length depends on a number of padding bits in the padding field, to generate multiple modulated symbols from the one or more code words of the packet, and to transmit the modulated symbols to the STAs.
    Type: Grant
    Filed: November 17, 2019
    Date of Patent: October 5, 2021
    Assignee: NXP USA, Inc.
    Inventors: Sudhir Srinivasa, Hongyuan Zhang, Sri Varsha Rottela, B Hari Ram, Christian Raimund Berger
  • Publication number: 20210288754
    Abstract: A first portion of a physical layer (PHY) preamble of a PHY data unit is generated for transmission via a communication channel that comprises a plurality of sub-channels. A first portion of the PHY preamble is generated to include a legacy portion and a plurality of first non-legacy signal fields spanning the respective sub-channels. A second portion of a PHY preamble that immediately follows the first portion of the PHY preamble of the PHY data unit is generated to include: a non-legacy short training field spanning all sub-channels in the plurality of sub-channels, a plurality of non-legacy long training fields immediately following the non-legacy short training field, each non-legacy training field spanning all sub-channels in the plurality of sub-channels, and a second non-legacy signal field immediately following the plurality of non-legacy long training fields, the second-legacy signal field spanning all sub-channels in the plurality of sub-channels.
    Type: Application
    Filed: May 28, 2021
    Publication date: September 16, 2021
    Inventors: Hongyuan ZHANG, Hui-Ling LOU, Rohit U. NABAR, Sudhir SRINIVASA, Mao YU, Raja BANERJEA
  • Publication number: 20210266386
    Abstract: Embodiments of a method and an apparatus for wireless communications are disclosed. In an embodiment, a method for wireless communications involves encoding bits in a first preamble portion of a packet that are defined on a per-channel basis and that are repeated across multiple frequency blocks of a bandwidth, encoding bits in a second preamble portion of the packet that are defined on the per-channel basis and that are repeated within at least one frequency block of the bandwidth, encoding bits in a third preamble portion of the packet that are defined on a two-channel basis and that are repeated within at least one frequency block of the bandwidth, padding the third preamble portion of the packet to have a same length for each of the frequency blocks, and transmitting the packet.
    Type: Application
    Filed: February 22, 2021
    Publication date: August 26, 2021
    Inventors: Rui Cao, Liwen Chu, Sudhir Srinivasa, Hongyuan Zhang, Yan Zhang, Xiayu Zheng
  • Publication number: 20210266890
    Abstract: A method and an apparatus for operating a Basic Service Set (BSS) are disclosed. A method involves announcing, by a first wireless device to a second wireless device, a BSS operating channel, wherein the first wireless device has at least one of a first transmission power capability and a first bandwidth capability, the second wireless device has at least one of a second transmission power capability that is less than the first transmission power capability and a second bandwidth capability that is narrower than the first bandwidth capability, and wherein the BSS operating channel is at least one of a punctured operating channel and an unpunctured operating channel, associating, by the second wireless device, with the first wireless device via the announcement of the BSS operating channel from the first wireless device, and exchanging frames between the first wireless device and the second wireless device in the BSS operating channel.
    Type: Application
    Filed: February 22, 2021
    Publication date: August 26, 2021
    Inventors: Liwen CHU, Rui CAO, Sudhir SRINIVASA, Hongyuan ZHANG, Huiling LOU, Young Hoon KWON
  • Publication number: 20210266098
    Abstract: Embodiments of a method and an apparatus for wireless communications are disclosed. In an embodiment, a method of wireless communications involves encoding bits in Extremely High Throughput (EHT) signaling fields of a packet corresponding to at least one of an Orthogonal Frequency-Division Multiple Access (OFDMA) mode, a non-OFDMA mode, and a Null Data Packet (NDP) mode, wherein EHT signaling fields include a Universal signal (U-SIG) field and an EHT signal (EHT-SIG) field, and transmitting the packet with encoded bits corresponding to at least one of the OFDMA mode, the non-OFDMA mode, and the NDP mode.
    Type: Application
    Filed: February 22, 2021
    Publication date: August 26, 2021
    Inventors: Rui Cao, Liwen Chu, Sudhir Srinivasa, Hongyuan Zhang, Prashant Sharma, Xiayu Zheng
  • Patent number: 11082156
    Abstract: A communication device generates a physical layer (PHY) data portion of a PHY data unit, including, for each of a plurality of PHY protocol service data units (PSDUs) to be included in the PHY data unit: selecting a segment boundary within a last-occurring orthogonal frequency division (OFDM) symbol from among a set of multiple segment boundaries, adding pre-forward error correction (pre-FEC) padding bits to the PSDU such that, after encoding the PSDU according to a forward error correction (FEC) code, coded bits of the PSDU end on the selected segment boundary, and individually encoding the PSDU according to the FEC code. The communication device generates a PHY preamble, which includes generating the PHY preamble to include a plurality of indications of a plurality of durations of the respective PSDUs within the PHY data portion.
    Type: Grant
    Filed: October 29, 2019
    Date of Patent: August 3, 2021
    Assignee: NXP USA, Inc.
    Inventors: Yan Zhang, Liwen Chu, Rui Cao, Sudhir Srinivasa, Hongyuan Zhang
  • Patent number: 11082155
    Abstract: A communication device generates one or more physical layer (PHY) PHY protocol service data units (PSDUs) of a PHY data unit, and individually encodes PSDUs of the one or more PSDUs. The communication device generates a PHY preamble of the PHY data unit, including: generating a first signal field in the PHY preamble, and including in the first signal field an indicator to indicate that the PHY preamble includes a second signal field with HARQ information regarding the PHY data unit, and generating the second signal field to include one or more indications of one or more durations of the one or more respective PSDUs within a PHY data portion of the PHY data unit.
    Type: Grant
    Filed: October 29, 2019
    Date of Patent: August 3, 2021
    Assignee: NXP USA, Inc.
    Inventors: Yan Zhang, Liwen Chu, Rui Cao, Sudhir Srinivasa, Hongyuan Zhang
  • Publication number: 20210227529
    Abstract: Embodiments of a method and an apparatus for multi-link data transmission are disclosed. In an embodiment, a method for communications involves at a first device, transmitting, to a second device, a trigger frame that solicits at least one Physical layer Protocol Data Unit (PPDU) for uplink transmission, wherein the trigger frame includes a standard-compatible common info field that includes a trigger type field and a standard-compatible user info list field that includes at least one user info field, wherein the trigger frame includes a solicited Trigger-Based (TB) type indicator in a field in the trigger frame other than the trigger type field, and receiving, at the first device, at least one PPDU from the second device in response to the solicited TB type indicator that was transmitted in the trigger frame by the first device.
    Type: Application
    Filed: December 31, 2020
    Publication date: July 22, 2021
    Inventors: Liwen CHU, Rui CAO, Sudhir SRINIVASA, Hongyuan ZHANG, Young Hoon KWON, Hui-Ling LOU
  • Patent number: 11071060
    Abstract: Embodiments described herein provide a method for transmitting a wake-up radio packet to low power devices in a wireless local area network. At a wireless access point having a plurality of antennas, data for transmission to one or more lower power wireless devices are received. A wake-up radio packet, including a wake-up data frame, is configured for transmission to the one or more lower power wireless devices. A waveform for transmitting the wake-up radio packet is generated. At each of the plurality of antennas, the waveform is adjusted with spatial mapping to prevent unintentional spatial nulling of the waveform during transmission of the wake-up radio packet. The wake-up radio packet is transmitted, via the plurality of antennas, in a form of the adjusted waveform to the one or more lower power wireless devices prior to transmitting the received data to the one or more lower power wireless devices.
    Type: Grant
    Filed: October 31, 2018
    Date of Patent: July 20, 2021
    Assignee: Marvell Asia Pte, Ltd.
    Inventors: Rui Cao, Hongyuan Zhang, Sudhir Srinivasa
  • Patent number: 11050589
    Abstract: Embodiments described herein provide a method for null data packet transmission. An information symbol is obtained for transmission in a null data packet. A set of tones for transmitting the information symbol is obtained and divided into a first subset of tones and a second subset of tones. A first value is transmitted over the first subset of tones and a second value is transmitted over the second subset of tones to indicate a feedback information bit of zero from the information symbol. A third value is transmitted over the first subset of tones and a fourth value is transmitted over the second subset of tones to indicate a feedback information bit of one from the information symbol.
    Type: Grant
    Filed: January 29, 2019
    Date of Patent: June 29, 2021
    Assignee: Marvell Asia Pte, Ltd.
    Inventors: Sayak Roy, Ankit Sethi, Sudhir Srinivasa, Hongyuan Zhang
  • Publication number: 20210194621
    Abstract: Systems, apparatuses and methods described herein provide a method for padding a signal extension of orthogonal frequency-division multiplexing (OFDM) symbols. A transceiver may obtain a plurality of data symbols for transmission, and determine that a number of information bits for a last symbol of the plurality of data symbols is not an integer value. A special padding rule may be applied to add padding bits to the last symbol. A number of coded bits for the last symbol may be determined when the number of information bits for the last symbol has changed, and the plurality of data symbols for data transmission may be encoded based on the determined number of coded bits for the last symbol.
    Type: Application
    Filed: March 8, 2021
    Publication date: June 24, 2021
    Inventors: Yakun Sun, Hongyuan Zhang, Sudhir Srinivasa, Rui Cao
  • Patent number: 11025368
    Abstract: A preamble of a physical layer (PHY) data unit that conforms to a first communication protocol is generated. The preamble includes a legacy field that is formatted according to a second communication protocol, and a signal field having a first orthogonal frequency division multiplexing (OFDM) symbol and a second OFDM symbol. The first OFDM symbol (i) immediately follows the legacy field and (ii) is modulated using binary phase shift keying (BPSK) modulation, whereas a third communication protocol specifies that an OFDM symbol, defined by the third communication protocol, that immediately follows the legacy field is modulated using BPSK modulation rotated by 90 degrees (Q-BPSK). The second OFDM symbol (i) immediately follows the first OFDM symbol and (ii) is modulated using Q-BPSK to indicate to a receiver device that conforms to the first communication protocol that the data unit conforms to the first communication protocol.
    Type: Grant
    Filed: May 15, 2017
    Date of Patent: June 1, 2021
    Assignee: Marvell Asia Pte, Ltd.
    Inventors: Hongyuan Zhang, Hui-Ling Lou, Rohit U. Nabar, Sudhir Srinivasa, Mao Yu, Raja Banerjea
  • Publication number: 20210160959
    Abstract: A data unit comprising bits to transmit over one or more frequency segments in a frequency range is obtained. An effective bandwidth in each frequency segment of the frequency range is determined, where the effective bandwidth excludes bandwidth of one or more punctured subchannels in a respective frequency segment. Bits are encoded based on the effective bandwidth of each frequency segment followed by parsing the encoded bits to one or more streams and parsing the encoded bits of a stream to the one or more frequency segments. The parsing of the encoded bits of the stream comprises allocating a first number of consecutive encoded bits to a first frequency segment and allocating a second number of consecutive encoded bits to a second frequency segment, wherein the first number and the second number are based on the effective bandwidth of the first frequency segment and the second frequency segment. The encoded bits are modulated and mapped to subcarriers for transmission.
    Type: Application
    Filed: November 24, 2020
    Publication date: May 27, 2021
    Inventors: Rui Cao, Hongyuan Zhang, Sudhir Srinivasa
  • Publication number: 20210143884
    Abstract: Various embodiments relate to a system and method for joint sounding by a client with a master access point (AP) and a slave (AP), including: receiving a message from the master AP; applying network allocation vector (NAV) rules to update a NAV values, wherein the received message is treated as an intra-basic service set (BSS) message when the transmit address (TA) of the received message has a prespecified value; receiving a first trigger frame; and transmitting a first channel state information (CSI) to the master AP when the channel is idle based upon the updated NAV value in response to the trigger frame.
    Type: Application
    Filed: November 10, 2020
    Publication date: May 13, 2021
    Inventors: Young Hoon KWON, Liwen CHU, Sudhir SRINIVASA, Hongyuan ZHANG, Huiling LOU
  • Patent number: 11006480
    Abstract: A communication device generates a physical layer (PHY) data unit that includes a PHY preamble and one or more PHY midambles. The communication generates the PHY preamble of the PHY data unit to include i) a signal field having a subfield that indicates that the PHY data unit includes one or more PHY midambles, ii) a short training field (STF) for automatic gain control (AGC) training and synchronization at a receiver, and iii) one or more long training fields (LTFs) for determining a channel estimate at the receiver. The communication generates a data payload of the PHY data unit having i) a set of orthogonal frequency division multiplexing (OFDM) symbols, and ii) one or more PHY midambles. Each of the one or more PHY midambles includes one or more LTFs for determining an updated channel estimate. The communication device transmits the PHY data unit via a wireless communication channel.
    Type: Grant
    Filed: July 29, 2019
    Date of Patent: May 11, 2021
    Assignee: Marvell Asia Pte, Ltd.
    Inventors: Hongyuan Zhang, Rohit U. Nabar, Sudhir Srinivasa, Raja Banerjea, Yong Liu
  • Patent number: 10993197
    Abstract: A method for communication in a WLAN includes associating a client station (STA) with a basic service set (BSS) of a first access point (AP), having first antennas, in a wireless local area network (WLAN). A second AP, having second antennas, in the WLAN is synchronized with the first AP. Distributed beamforming parameters are computed over a group of the first antennas and the second antennas. Data for transmission to the STA are distributed to both the first AP and the second AP. The distributed data are distributed to the STA from the first AP via the first antennas in the group and the second AP via the second antennas in the group in synchronization in accordance with the distributed beamforming parameters.
    Type: Grant
    Filed: May 29, 2019
    Date of Patent: April 27, 2021
    Assignee: NXP USA, Inc.
    Inventors: B Hari Ram, Sri Varsha Rottela, Vijay Ahirwar, Sudhir Srinivasa, Nilesh N Khude
  • Publication number: 20210112518
    Abstract: A first communication device determines which one or more types of feedback information, from among a plurality of types of feedback information associated with a range measurement exchange session, a second communication device is to provide to the first communication device in a feedback packet transmitted as part of the range measurement exchange session. The first communication device transmits to the second communication device one or more indications of the determined one or more types of feedback information that the second communication device is to provide to the first communication device in the feedback packet. The first communication device performs the range measurement exchange, including receiving the feedback packet from the second communication device, wherein the feedback packet includes the determined one or more types of feedback information.
    Type: Application
    Filed: December 22, 2020
    Publication date: April 15, 2021
    Inventors: Liwen CHU, Hongyuan ZHANG, Christian R. BERGER, Niranjan GRANDHE, Sudhir SRINIVASA, Hui-Ling LOU