Marvellworld Trade Ltd.

Marvell International Limited

Nxp Usa, Inc.

Marvell Asia Pte., Ltd.

Nxp B.v.

Rakuten Group, Inc.

Marvell Semiconductor, Inc.

Sudhir Srinivasa

Hongyuan Zhang

Rohit U Nabar

Raja Banerjea

Rui Cao

Liwen Chu

Ankit Sethi

Xiayu Zheng

Sayak Roy

Yong Liu

Hui-Ling Lou

Christian Raimund Berger

Hyukjoon Kwon

Vijay Ahirwar

Sri Varsha Rottela

Niranjan Grandhe

B Hari Ram

Yakun Sun

Nilesh Nilkanth Khude

Hari Ram Balakrishnan

Mao Yu

Yan Zhang

Mingguang Xu

Jie Huang

Young Hoon Kwon

Atul Salhotra

Harish Ramamurthy

Timothy J Donovan

Yui Lin

Swaroop Venkatesh

Sergey Timofeev

Su Khiong Yong

Arul Durai Murugan Palanivelu

Lokesh Sundaramurthy Satrasala

Kedar Shirali

Ken Kinwah Ho

Brian Bosso

Sagar A Tamhane

Yihong Qi

Sai-Wang Tam

Alden C Wong

Vijay Ganwani

Vikas Gulati

Alireza Razzaghi

Erik Heinke

Foo Keong Tang

Riddhi Madani

Li Zhang

Randy Tsang

Huiling Lou

Tsunglun Yu

Yanni Chen

Li-Fu Jeng

Hua Mu

Prashant Sharma

Shuangqing Yuan

Hemabh Shekhar

Chusong Xiao

Sridhar Reddy Narravula

Wai Lau

Yong Ma

Ping Gao

Rulin Huang

Ovidiu Carnu

Su Chenxin

Hsun-Yao Jan

Sih-Yu Lin

Parag Suresh Khairnar

Salil Kashyap

Honyuan Zhang

Tian Liu

Rihua Wei

Christian R Berger

A receiver receives a wireless signal comprising a plurality of fields including a legacy short training field (L-STF), legacy long training field (L-LTF), and legacy signal (L-SIG) field transmitted to a plurality of antenna of the receiver. For each sub-band in a receiver bandwidth and when samples of the L-STF is received, a first angle based autocorrelation is performed to determine a group of sub-bands which maximize a magnitude based on the first autocorrelations for one or more sub-bands. For each sub-band in the receiver bandwidth and when samples of the L-LTF is received, a second angle based autocorrelation is then performed to refine the crude bandwidth pattern estimate. One or more signal fields and one or more data fields of the received signal are decoded based on the refined bandwidth pattern estimate.

Method and apparatus for bandwidth detection in wireless networks

A beamformee receives a channel coefficient matrix H of a wireless communication channel between a beamformer and the beamformee. The channel coefficient matrix is a 2×N complex matrix having two rows corresponding to two antenna of the beamformee and N columns corresponding to N antenna of the beamformer. A real symmetric matrix M is determined based on the matrix H followed by determining eigenvalues and eigenvectors of matrix M. Singular vectors of the matrix H based on the eigenvectors are determined where the singular vectors define a steering matrix. The steering matrix is transmitted to a beamformer, wherein a beam is steered by the beamformer to the beamformee based on the steering matrix.

Method and apparatus for closed form singular value decomposition associated with beamforming in wireless networks

A cancellation circuit includes a limiter connected to an output of a first transmitter power amplifier that converts in input sinewave to a digital square wave and a digital to time converter (DTC) connected to the limiter. A RF digital to RF converter is connected to the DTC that converts the digital square wave input into an analog RF output. A cancellation amplifier with an input receives an output from the RF digital to RF converter and has an output connected to an output of a second transmitter power amplifier. The cancellation amplifier produces a cancellation signal to cancel an interference signal at the output of the second transmitter power amplifier from the output of the first transmitter power amplifier. A power detector is connected to the output of the second power amplifier that produces a power value detected at the output of the second power amplifier.

Cancellation circuit using digital to time converter

A multi-radio system comprises a first radio and a second radio co-located on the multi-radio system. The first radio is arranged to generate an RF transmit signal which is output by a first antenna of the first radio. In an example, the first radio comprises a radio frequency (RF) canceller arranged to output a RF cancellation signal which couples with the RF transmit signal received at a second antenna of the second radio. The RF cancellation signal that is output results in the cancellation of the RF transmit signal at the second antenna of the second radio.

Interference cancellation in a multi-radio system and apparatus for cancellation

A transmitter, including: a plurality of antennas; and a controller configured to: receive a first steering matrix for a first feedback tone; receive a second steering matrix for a second feedback tone; estimate an ideal second steering matrix including: estimating a set of random phasors applied to the columns of the second feedback matrix; and estimating a set of row-dependent delays applied to the rows of the second feedback matrix; estimate a vector of angles based upon the estimated set of random phasors; and calculate a steering matrix for a tone between the first feedback tone and the second feedback tone by interpolating between the first steering matrix and the ideal second steering matrix based upon the estimated vector of angles.

Bi-dimensional steering matrix alignment at beamformer

One example discloses a method for beamforming feedback reduction in a WLAN (wireless local area network), including: generating a per-tone beamforming feedback matrix by vectorizing a set of steering vectors using vectorization based dimension reduction (DR-Vec); performing lossy compression on the vectors; reducing the per-tone beamforming feedback matrix to one vector; and generating per-tone beamforming angle information using only the one vector.

Beamforming feedback reduction in wifi

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.

Method and apparatus for communications

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.

Apparatus and methods for multi-AP joint transmission and reception

A preamble of physical layer (PHY) data unit includes a first legacy portion and a first non-legacy portion that follows the first legacy portion. The first non-legacy portion includes i) a first orthogonal frequency division multiplexing (OFDM) symbol that immediately follows the first legacy portion and that is modulated using binary phase shift keying (BPSK), and ii) a second OFDM symbol that immediately follows the first OFDM symbol and that is modulated using BPSK modulation rotated by 90 degrees (Q-BPSK). The modulation of the first and second OFDM symbols indicates to a receiver device that conforms to a first communication protocol that the data unit conforms to the first communication protocol. The first OFDM symbol being modulated using BPSK modulation causes a receiver device that conforms to a second communication protocol to determine that the PHY data unit conforms to a third communication protocol.

Physical layer frame format for WLAN

A method and system comprises receiving a signal over an air interface. A binary sequence is detected in the signal. A legacy signal (L-SIG) field of a physical layer protocol data circuit (PPDU) is decoded based on the detected binary sequence and based on decoding the L-SIG field, two spoofing symbols which directly follow the L-SIG field is checked in the PPDU, wherein the two spoofing symbols comprise binary phase shift keying (BPSK) symbols. Based a presence of the two spoofing symbols, a long range portion of the PPDU is processed; and based on an absence of the two spoofing symbols, the PPDU is processed as a legacy PPDU.

Non-long range preamble design for long range wireless packet and methods for processing the preamble

One example discloses a wireless Access Point (AP) device, within a wireless local area network (WLAN), including: a controller configured to generate a reserve slot time trigger frame to a selected set of wireless devices; wherein the controller is configured to be coupled to an antenna; wherein the antenna is configured to transmit the reserve slot time trigger frame over a physical media to the selected set of user station devices (STAs) and exchange traffic with the selected set of STAs over the physical media; wherein the reserve slot time trigger frame is configured to reserve a slot time on the physical media; and wherein the controller is configured to transmit a burst of downlink (DL) traffic from the AP device during the slot time.

Wireless communications device

One example discloses a wireless Access Point (AP) device, configured to operate within a wireless local area network (WLAN), including: a controller configured to generate a reserve slot time trigger frame and a request to transmit trigger frame; wherein the controller is configured to be coupled to an antenna; wherein the antenna is configured to transmit the trigger frames over a physical media to a set of user station devices (STAs) and exchange traffic with the set of STAs over the physical media; wherein the reserve slot time trigger frame is configured to reserve a slot time on the physical media; and wherein the request to transmit trigger frame is configured to command a first STA from the set of STAs to transmit data buffered in the first STA to the AP device.

Embodiments of a method and an apparatus for wireless communications are disclosed. In an embodiment, a method for wireless communications involves generating a packet for transmission to a user, where generating the packet includes: encoding user signaling parameters and setting a station-identification (STA-ID) of the user to a value, where the signaling parameters include a number of space time streams (nSTS) spatial streams, establishing a dummy user without changing the user signaling parameters, setting a STA-ID of the dummy user to a value that is different from the STA-ID value of the user, indicating the nSTS spatial streams that are allocated to the dummy user and that are to include Long Training Field (LTF) symbols, and transmitting the packet to the user with the LTF symbols.

Method and apparatus for wireless communications

A communication device receives a physical layer (PHY) data unit having a PHY preamble with a non-legacy signal field. The non-legacy signal field includes a multi-bit signal field header that occupies a beginning portion of the non-legacy signal field. A plurality of available values of the multi-bit signal field header includes i) at least one available value corresponding to a wireless communication protocol, and ii) multiple other available values reserved for at least one of i) at least one future version of the wireless communication protocol, and ii) at least one future wireless communication protocol. The multi-bit signal field header indicates a field format of other subfields of the non-legacy signal field that follow the multi-bit signal field header. The communication device processes the beginning portion of the non-legacy signal field to determine a field format of the other subfields of the non-legacy signal field.

Physical layer preamble for wireless local area networks

A first access point (AP) receives a first physical layer (PHY) data unit for initiating a joint channel sounding procedure between a group of APs and one or more client stations. The first AP receives a second PHY data unit for initiating a joint transmission by the group of APs. The first AP uses training signals in the first PHY data unit and the second PHY data unit to calculate a relative timing offset. The first AP uses the relative timing offset to adjust a transmit time of a third PHY data transmitted as part of the joint transmission.

Synchronization of joint transmissions with multiple access points

Growing community of inventors

Campbell, CA, United States of America

Sudhir Srinivasa