Patents by Inventor Gokul SRIDHARAN

Gokul SRIDHARAN 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).

  • SELECTING THE LOCATION OF PEAK REDUCTION TONES FOR REDUCING A PEAK-TO-AVERAGE POWER RATIO OF A WIRELESS TRANSMISSION
    Publication number: 20210409251
    Abstract: Aspects of the disclosure relate to techniques for peak-to-average power ratio (PAPR) reduction based on a tone reservation (TR) algorithm. For a TR algorithm, a suitable subset of tones from among a full set of tones in a given resource allocation are reserved for use as peak reduction tones (PRT). An apparatus, such as a wireless communication device, selects a set of PRTs based on a deterministic pseudo-random tone selection algorithm, such as quadratic sampling, cubic sampling, or Fibonacci-type sampling. The apparatus determines a PAPR reduction waveform for transmission on the PRTs and transmits a data waveform multiplexed with the PAPR reduction waveform on resources corresponding to the resource allocation. Other aspects, embodiments, and features are also claimed and described.
    Type: Application
    Filed: June 23, 2021
    Publication date: December 30, 2021
    Inventors: Wei YANG, Saeid SAHRAEI, Gokul SRIDHARAN, Krishna Kiran MUKKAVILLI
  • Orthogonal demodulation reference signal (DMRS) port generation for pi/2 binary phase shift keying (BPSK)
    Patent number: 11196597
    Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may generate multiple orthogonal demodulation reference signal (DMRS) sequences associated with multiple orthogonal DMRS ports based at least in part on a pi/2 binary phase shift keying (BPSK) based DMRS base sequence and based at least in part on utilizing at least one of a frequency-domain comb structure or a time-domain orthogonal cover code (OCC), wherein the multiple orthogonal DMRS ports are associated with different UEs; determine a DMRS port, of the multiple orthogonal DMRS ports, to be used in association with a transmission of pi/2 BPSK modulated data; and transmit the pi/2 BPSK modulated data and a DMRS sequence, of the multiple orthogonal DMRS sequences, associated with the DMRS port. Numerous other aspects are provided.
    Type: Grant
    Filed: October 2, 2019
    Date of Patent: December 7, 2021
    Assignee: QUALCOMM Incorporated
    Inventors: Wei Yang, Yi Huang, Peter Gaal, Gokul Sridharan, Seyong Park
  • PEAK REDUCTION TONE (PRT) SELECTION
    Publication number: 20210377090
    Abstract: Aspects of the disclosure relate to selection and use of peak reduction tones (PRTs) including obtaining a predetermined sequence of PRTs corresponding to a set of granted resources including a plurality of tones, mapping a set of data to a first subset of the plurality of tones outside of the predetermined sequence of PRTs and mapping a set of PRTs to a second subset of the plurality of tones within the predetermined sequence of PRTs. At least one peak of a time domain representation of the first subset of the plurality of tones is canceled using a time domain representation of the second subset of the plurality of tones. A transmitted waveform comprising the first subset of the plurality of tones and the second subset of the plurality of tones is transmitted.
    Type: Application
    Filed: May 27, 2021
    Publication date: December 2, 2021
    Inventors: Saeid SAHRAEI, Gokul SRIDHARAN, Peter GAAL, Krishna Kiran MUKKAVILLI, June NAMGOONG
  • PEAK REDUCTION TONE ALLOCATION TECHNIQUES
    Publication number: 20210377088
    Abstract: A transmitting device communicates with a receiving device an indication to apply PAPR reduction for a data transmission. The transmitting device applies a first PAPR reduction signal and a second PAPR reduction signal to the data transmission to reduce at least one signal peak of the data transmission to yield a transmission signal, where the first PAPR reduction signal includes a first set of PRTs that does not overlap with data tones and the second PAPR reduction includes a second set of PRTs that overlaps with the data tones and does not overlap with reserved tones. The transmitting device transmits the transmission signal to the receiving device.
    Type: Application
    Filed: May 26, 2021
    Publication date: December 2, 2021
    Inventors: Peter GAAL, Saeid SAHRAEI, Krishna Kiran MUKKAVILLI, June NAMGOONG, Gokul SRIDHARAN
  • PEAK REDUCTION TONE ALLOCATION TECHNIQUES
    Publication number: 20210377089
    Abstract: A transmitting device applies a first MCS to a first set of data tones that overlaps with a first set of PRTs within a plurality of tones, the first set of PRTs being associated with a first PAPR reduction signal. The transmitting device applies a second MCS to a second set of data tones that overlaps with a second set of PRTs within the plurality of tones, the second set of PRTs being associated with a second PAPR reduction signal. The transmitting device can transmit a transmission signal comprising the first set of data tones and the second set of data tones, the transmission signal using a waveform based at least in part on the first PAPR reduction signal and the second PAPR reduction signal.
    Type: Application
    Filed: May 26, 2021
    Publication date: December 2, 2021
    Inventors: Peter GAAL, Saeid SAHRAEI, Krishna Kiran MUKKAVILLI, June NAMGOONG, Gokul SRIDHARAN
  • Physical uplink shared channel power scaling to enhance power utilization at a user equipment
    Patent number: 11191033
    Abstract: Certain aspects of the present disclosure provide techniques for scaling transmission power across transmit chains for physical uplink shared channel (PUSCH) transmissions. In some cases, a UE may determine a transmit power budget, receiving signaling indicating how to allocate the transmit power budget across transmit chains for a physical uplink shared channel (PUSCH) transmission, allocate the transmit power budget across transmit chains for a physical uplink shared channel (PUSCH) transmission, and transmitting the PUSCH using the transmit chains according to the determined transmit power allocation.
    Type: Grant
    Filed: August 2, 2019
    Date of Patent: November 30, 2021
    Assignee: QUALCOMM Incorporated
    Inventors: Gokul Sridharan, Yi Huang, Xiao Feng Wang, Peter Gaal, Jay Kumar Sundararajan, Wanshi Chen, Wei Yang
  • Sounding reference signal configurations to support uplink transmissions with cyclic delay diversity
    Patent number: 11184129
    Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive an indication of a sounding reference signal (SRS) resource set to be used to signal a virtual port used for a physical uplink shared channel (PUSCH) communication, wherein the virtual port is a combination of at least two non-coherent or partially-coherent antenna ports of the UE using precoding and cyclic delay diversity; and transmit an SRS for the at least two non-coherent or partially-coherent antenna ports using one or more resources of the SRS resource set. Numerous other aspects are provided.
    Type: Grant
    Filed: September 19, 2019
    Date of Patent: November 23, 2021
    Assignee: QUALCOMM Incorporated
    Inventors: Gokul Sridharan, Yi Huang, Xiao Feng Wang, Wei Yang, Jay Kumar Sundararajan, Peter Gaal
  • Power imbalance solutions for multiple input multiple output transmissions
    Patent number: 11184134
    Abstract: Methods, systems, and devices for wireless communications are described. A transmitting device may identify multiple demodulation reference signal (DMRS) symbols corresponding to multiple DMRS ports of a multiple input multiple output configuration. The transmitting device may generate multiple phase-rotated and precoded DMRS symbols by applying an orthogonal cover code, a phase rotation scheme, and a precoding matrix to the identified DMRS symbols. The transmitting device may map the phase-rotated and precoded DMRS symbols to time-frequency resources corresponding to multiple antenna ports, and transmit a DMRS based on the mapped phase-rotated and precoded DMRS symbols. The transmitting device may transmit the DMRS using multiple antennas that correspond to the antenna ports.
    Type: Grant
    Filed: December 3, 2019
    Date of Patent: November 23, 2021
    Assignee: QUALCOMM Incorporated
    Inventors: Wei Yang, Yi Huang, Alexandros Manolakos, Wanshi Chen, Peter Gaal, Gokul Sridharan, Juan Montojo
  • PEAK REDUCTION TONE ALLOCATION TECHNIQUES
    Publication number: 20210359890
    Abstract: Aspects presented herein may improve the efficiency and performance of the tone reservation PAPR reduction technique by allocating peak reduction tone based at least in part on a channel condition, such as based on the signal to noise ratio of the channel. In some aspects, a transmitting device measures a signal to noise ratio for a plurality of tones within a frequency resource. The transmitting device selects a location of one or more reserved tones (e.g., peak reduction tones) among one or more tones based at least in part on an SNR for one or more tones. The transmitting device transmits data to a receiving device in a subset of the plurality of tones that does not include the one or more peak reduction tones. Other aspects and features are also disclosed.
    Type: Application
    Filed: May 12, 2021
    Publication date: November 18, 2021
    Inventors: Saeid SAHRAEI, Krishna Kiran MUKKAVILLI, Gokul SRIDHARAN, June NAMGOONG
  • METHODS AND APPARATUS FOR USING INTERLACED PHYSICAL RESOURCE BLOCKS FOR POSITIONING MEASUREMENTS
    Publication number: 20210360572
    Abstract: In a positioning session for a user equipment (UE), one or more base stations may receive and derive positioning measurements from uplink (UL) transmission from the UE that include a physical resource block (PRB) interlaced waveform based on at least one of interlaced physical uplink control channel (PUCCH) resource blocks, interlaced physical uplink shared channel (PUSCH) RBs resource blocks, interlaced sounding reference signal (SRS), interlaced uplink (UL) positioning reference signal (PRS), or a combination thereof. The interlaced waveforms span a greater wavelength than if interlacing were not used, and an enhanced accuracy requirement for the positioning measurements based on the span may be used for the positioning measurements. The UL interlaced PRBs may be used for UL positioning measurements for combined downlink (DL) and UL positioning measurements.
    Type: Application
    Filed: May 4, 2021
    Publication date: November 18, 2021
    Inventors: Alexandros MANOLAKOS, Weimin Duan, Gokul Sridharan, Jay Kumar Sundararajan, Hwan Joon Kwon, Wanshi Chen, Krishna Kiran Mukkavilli
  • BANDWIDTH-EFFICIENT UTILIZATION OF PEAK REDUCTION TONE RESOURCE
    Publication number: 20210360635
    Abstract: Wireless communications systems and methods related to bandwidth-efficient utilization of peak reduction tone resource are provided. An example method of wireless communications performed by a user equipment (UE) includes receiving, from a base station in a first subband, a resource allocation indicating a set of transmission tones comprising a set of first data tones, a set of second data tones and a set of peak reduction tones (PRTs). The resource allocation can indicate the set of first data tones overlaps at least a portion of the set of PRTs at respective locations of a set of PRT locations and the set of second data tones is arranged at a set of data tone locations within a particular bandwidth. The UE can communicate, with the base station in a second subband, a data transmission using an outgoing waveform based at least in part on the resource allocation.
    Type: Application
    Filed: May 13, 2021
    Publication date: November 18, 2021
    Inventors: Saeid SAHRAEI, Gokul SRIDHARAN, June NAMGOONG, Krishna Kiran MUKKAVILLI, Peter GAAL, Hwan Joon KWON, Hung Dinh LY, Tingfang JI
  • PRECODING TECHNIQUES FOR WIRELESS COMMUNICATIONS
    Publication number: 20210359731
    Abstract: Methods, systems, and devices for wireless communications are described in which a base station may identify a null space matrix that lies within a null space of an effective channel matrix for communications between the base station and a user equipment (UE). An indication of the null space matrix may be provided to the UE, and the null space matrix used to determine modifications to a precoding matrix. The base station and UE may determine a redistribution matrix that provides a reduced variance of transmission powers for a number of transmission channels, where a product of the null space matrix and the redistribution matrix may be computed and added to the precoding matrix to generate a modified precoding matrix. The modified precoding matrix may be used to generate the communications from the base station and UE with reduced power variance across channels.
    Type: Application
    Filed: April 30, 2021
    Publication date: November 18, 2021
    Inventors: Saeid Sahraei, Gokul Sridharan, Shimman Arvind Patel, Krishna Kiran Mukkavilli, June Namgoong, Taesang Yoo, Renqiu Wang
  • TRANSMITTING PAYLOADS USING M-SEQUENCES
    Publication number: 20210360632
    Abstract: Aspects relate to technologies and techniques for sequence-based, non-coherent wireless channel transmission of a payload on a physical uplink channel. A transmitter converts information bits of a payload to be transmitted to a decimal integer value that is, in turn, used to generate a modified maximum sequence (m-sequence) based on one or more predetermined parameters such as an m-sequence generating polynomial, a starting location in the sequence, and an initialization. The generated modified m-sequences are modulated using modulation schemes such as ?/2 binary phase-shift keying and quadrature phase-shift keying for transmission on the physical uplink channel.
    Type: Application
    Filed: May 13, 2021
    Publication date: November 18, 2021
    Inventors: Wei YANG, Peter GAAL, Yi HUANG, Hwan Joon KWON, Krishna Kiran MUKKAVILLI, Gokul SRIDHARAN, Tingfang JI, Juan MONTOJO
  • DYNAMIC SLOT AGGREGATION INDICATION FOR RANDOM ACCESS PROCEDURE
    Publication number: 20210352712
    Abstract: A method for wireless communication by a user equipment (UE) includes transmitting, to a base station, a random access preamble to initiate a random access procedure. The method also includes receiving, from the base station based on transmitting the random access preamble, a downlink message comprising a repetition number indicator. The method further includes transmitting a number of repetitions of a physical uplink channel based on the repetition number indicator.
    Type: Application
    Filed: May 5, 2021
    Publication date: November 11, 2021
    Inventors: Hung Dinh LY, Gokul SRIDHARAN, Krishna Kiran MUKKAVILLI
  • PEAK-TO-AVERAGE POWER RATIO REDUCTION
    Publication number: 20210351868
    Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may interleave a signal, that is to be transmitted using discrete Fourier transform (DFT) spread orthogonal frequency-division multiplexing (DFT-s-OFDM), and a negative of the signal to obtain an interleaved signal prior to performing a DFT on the interleaved signal. The UE may transmit a DFT-s-OFDM signal that is based at least in part on the interleaved signal. Numerous other aspects are provided.
    Type: Application
    Filed: February 10, 2021
    Publication date: November 11, 2021
    Inventors: Saeid SAHRAEI, Hung Dinh LY, Tingfang JI, Krishna Kiran MUKKAVILLI, Hwan Joon KWON, June NAMGOONG, Taesang YOO, Shimman Arvind PATEL, Gokul SRIDHARAN
  • SCALABLE SIZING OF TRANSPORT BLOCKS FOR UPLINK TRANSMISSIONS
    Publication number: 20210352527
    Abstract: A UE may be configured to determine a size of the TB for transmission to a base station based on signaling received from the base station for configuration of at least one of a scale factor or a slot aggregation factor associated with size of the TB. The UE may be further configured to transmit, to the base station, information on the TB in at least one slot, the TB being of the determined size. The base station may be configured to transmit, to the UE, the signaling for configuration of at least one of a scale factor or a slot aggregation factor associated with a size of the TB to be used by the UE for transmission. The base station may be further configured to receive, from the UE, information on at least one TB having a size that is based on at least one of the scale factor or the slot aggregation factor.
    Type: Application
    Filed: May 10, 2021
    Publication date: November 11, 2021
    Inventors: Gokul SRIDHARAN, Gabi SARKIS, Hung Dinh LY, Krishna Kiran MUKKAVILLI, Wanshi CHEN, Peter GAAL, Xipeng ZHU, Min WANG
  • TONE RESERVATION FOR PEAK TO AVERAGE POWER RATIO REDUCTION
    Publication number: 20210344544
    Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment may receive a resource allocation indicating a plurality of transmission tones comprising a subset of data tones of a plurality of data tones and a subset of peak reduction tones (PRTs) of a plurality of PRTs, wherein the resource allocation indicates a plurality of data tone locations and a plurality of PRT locations within a particular bandwidth, wherein a subset of PRT locations of the plurality of PRT locations are arranged relative to a subset of data tone locations of the plurality of data tone locations according to a PRT sequence corresponding to a set of allocated frequency resources; and transmit a data transmission using a waveform based at least in part on the resource allocation. Numerous other aspects are provided.
    Type: Application
    Filed: May 3, 2021
    Publication date: November 4, 2021
    Inventors: Saeid SAHRAEI, Gokul SRIDHARAN, Hung Dinh LY, June NAMGOONG, Krishna Kiran MUKKAVILLI, Naga BHUSHAN, Tingfang JI, Peter GAAL, Taesang YOO, Shimman Arvind PATEL
  • TONE RESERVATION FOR PEAK TO AVERAGE POWER RATIO REDUCTION
    Publication number: 20210344537
    Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment may receive a resource allocation indicating a plurality of transmission tones comprising a subset of data tones of a plurality of data tones and a subset of peak reduction tones (PRTs) of a plurality of PRTs, wherein the resource allocation indicates locations for the plurality of data tones and locations for the plurality of PRTs within a particular bandwidth, wherein the locations for the plurality of PRTs are arranged relative to the locations for the plurality of data tones according to a PRT subsequence of a universal PRT sequence, and wherein the PRT subsequence corresponds to a sub-band of the particular bandwidth; and transmit a data transmission using a waveform based at least in part on the resource allocation. Numerous other aspects are provided.
    Type: Application
    Filed: May 3, 2021
    Publication date: November 4, 2021
    Inventors: Saeid SAHRAEI, Gokul SRIDHARAN, Hung Dinh LY, June NAMGOONG, Krishna Kiran MUKKAVILLI, Naga BHUSHAN, Tingfang JI, Peter GAAL, Taesang YOO, Shimman Arvind PATEL
  • PEAK-TO-AVERAGE POWER RATIO (PAPR) REDUCTION TECHNIQUES
    Publication number: 20210344545
    Abstract: Techniques for peak-to-average power ratio (PAPR) reduction are described. Wireless devices may use one or more PAPR shaping resources, such as expanded bandwidth and/or pulse-shaping filtering, for shaping a signal to reduce PAPR. For example, expanded bandwidth may be utilized for adding a cyclic affix (CA), such as may comprise a cyclic prefix (CP), cyclic suffix (CS), etc., and combinations thereof, to a frequency domain data signal to provide a CP augmented frequency domain data signal used to generate a reduced PAPR time domain data signal. Additionally or alternatively, pulse-shaping filtering may be applied to a frequency domain signal to provide a pulse-shaped frequency domain data signal used to generate a reduced PAPR time domain data signal. Other aspects and features are also claimed and described.
    Type: Application
    Filed: February 25, 2021
    Publication date: November 4, 2021
    Inventors: Gokul Sridharan, Saeid Sahraei, June Namgoong, Peter Gaal, Krishna Kiran Mukkavilli, Tingfang Ji, Wei Yang
  • PEAK-TO-AVERAGE POWER RATIO (PAPR) REDUCTION TECHNIQUES
    Publication number: 20210344535
    Abstract: Techniques for peak-to-average power ratio (PAPR) reduction are described. Wireless devices may provide signaling with respect to one or more PAPR shaping resources. For example, a wireless device may provide signaling of PAPR shaping capability information. PAPR shaping capability information may include information regarding one or more PAPR shaping resources the wireless device has a capability to implement. Additionally or alternatively, a wireless device may provide signaling of PAPR shaping information. PAPR shaping information may include information regarding shaping the signal by a wireless device prior to transmission in a communication link by implementing one or more PAPR shaping resources. Other aspects and features are also claimed and described.
    Type: Application
    Filed: February 25, 2021
    Publication date: November 4, 2021
    Inventors: Gokul Sridharan, Saeid Sahraei, June Namgoong, Peter Gaal, Krishna Kiran Mukkavilli, Tingfang Ji, Wei Yang