公开(公告)号：US10944502B2

公开(公告)日：2021-03-09

申请号：US16295499

申请日：2019-03-07

Applicant: NXP USA, Inc.

Inventor： Yakun Sun ,  Hongyuan Zhang ,  Rui Cao ,  Sudhir Srinivasa

IPC: H04L1/00 ,  H04L5/00 ,  H04L27/26

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.

公开(公告)号：US10904058B2

公开(公告)日：2021-01-26

申请号：US16673523

申请日：2019-11-04

Applicant: NXP USA, Inc.

Inventor： Hongyuan Zhang ,  Xiayu Zheng ,  Rui Cao ,  Mingguang Xu ,  Sudhir Srinivasa ,  Jie Huang

IPC: H04L27/26 ,  H04L1/00 ,  H04L5/00 ,  H04B7/06

Abstract: A boundary within a last orthogonal frequency division multiplexing (OFDM) symbol of a PHY data unit is determined. Pre-encoder padding bits are added to a set of information bits to generate a set of padded information bits such that the set of padded information bits, after being encoded, fill one or more OFDM symbols up to the boundary within the last OFDM symbol. The set of padded information bits are encoded to generate a set of coded bits. A PHY preamble is generated to include a subfield that indicates the boundary. The one or more OFDM symbols are generated to include (i) the set of coded information bits in the one or more OFDM symbols up to the boundary to allow a receiving device to stop decoding the one or more OFDM symbols at the boundary, and (ii) post-encoder padding bits in the last OFDM symbol following the boundary.

公开(公告)号：US10804945B1

公开(公告)日：2020-10-13

申请号：US16176147

申请日：2018-10-31

Applicant: NXP USA, Inc.

Inventor： B Hari Ram ,  Lokesh Sundaramurthy Satrasala ,  Sudhir Srinivasa ,  Hongyuan Zhang

IPC: H04B1/12 ,  H04B7/0452 ,  H04W84/12

Abstract: The present disclosure describes apparatuses and methods for dynamic interference cancellation in wireless receivers. In some aspects, a signal vector transmitted through a wireless environment is received via multiple antennas of a receiver, the signal vector affected by interfering signals in the wireless environment. The receiver determines an interference channel matrix for the signal vector based on the interference received with the signal vector and selects, from the interference channel matrix, columns of the interference channel matrix to form a noise-cancelling equalization matrix. The receiver then equalizes the signal vector with the noise-cancelling equalization matrix to remove a portion of interference from the signal vector to provide noise-cancelled equalized values of the signal vector for decoding. By so doing, the receiver may reduce effects of interference of the wireless environment (e.g., interfering streams or signals) to improve receive performance for signal vectors that are intended for reception by the receiver.

公开(公告)号：US10728798B2

公开(公告)日：2020-07-28

申请号：US16126344

申请日：2018-09-10

Applicant: NXP USA, Inc.

Inventor： Yakun Sun ,  Hongyuan Zhang ,  Sudhir Srinivasa ,  Xiayu Zheng

IPC: H04W28/06 ,  H04L25/02 ,  H04L27/26 ,  H04B7/06 ,  H04B7/04 ,  H04W84/12

Abstract: Some embodiments described herein provide a method for transmitting a preamble in accordance with a wireless local area network communication protocol. In some embodiments, a data frame may be obtained for transmission including a preamble compliant with the wireless local area network communication protocol. It may be determined that the preamble includes a first preamble portion that spans multiple symbol durations and a second preamble portion that spans a single symbol duration. The first preamble portion via beamforming may be transmitted based on a first beamforming matrix. When a transmission mode of the second preamble portion is beamforming, a second beamforming matrix may be generated based on the first beamforming matrix, each tone for the second preamble portion may be calculated based on the second beamforming matrix. Each calculated tone may be transmitted in accordance with the wireless local area network communication protocol.

公开(公告)号：US20200169444A1

公开(公告)日：2020-05-28

申请号：US16527109

申请日：2019-07-31

Applicant: NXP USA, Inc.

Inventor： Sai-Wang Tam ,  Su Chenxin ,  Vijay Ahirwar ,  Rulin Huang ,  Alden C. Wong ,  Rui Cao ,  Sudhir Srinivasa ,  Alireza Razzaghi ,  Randy Tsang ,  Timothy J. Donovan

IPC: H04L27/26 ,  H04L25/03

Abstract: A millimeter-wave communication system includes a transmitter and a receiver. The transmitter is configured to be connected to a waveguide that is transmissive at millimeter-wave frequencies, the waveguide having a propagation parameter that varies with frequency at the millimeter-wave frequencies. The transmitter is configured to generate a millimeter-wave signal comprising multiple sub-carriers that are modulated with data, wherein each sub-carrier is modulated with a respective portion of the data and is subjected to only a respective fraction of a variation in the propagation parameter, and to transmit the millimeter-wave signal into a first end of the waveguide. The receiver is configured to receive the millimeter-wave signal from a second end of the waveguide, and to extract the data from the multiple sub-carriers.