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Avago Technologies General IP (singapore) Pte. Ltd.

Avago Technologies General IP Pte, Ltd.

Djordje Tujkovic

Krishna Srikanth Gomadam

Louay A Jalloul

Sanjai Kohli

Arogyaswami J Paulraj

Bertrand Martyn Hochwald

Sriram Mudulodu

Robert G Lorenz

Erik David Lindskog

David Garrett

Shashidhar Vummintala

Balaji Sundar Rajan

Kameswara Rao Medapalli

Vish Ponnampalam

Nabeel Ahmed

Anupama Lakshmanan

Erik Richard Stauffer

Kamlesh Rath

Brian Dunn

Sam P Alex

Po Han Huang

Ying Xia

Praveen Kumar Gopala

Brett Eric Schein

Mustafa Emin Sahin

Mohammad Janani

Rajesh Raja Manakkal

Vummintala Shashidhar

John S Walley

Sriram K Rajagopal

Alireza Tarighat Mehrabani

Sam Padinjaremannil Alex

Amin Mobasher

Soumen Chakraborty

Evan S McCarthy

Ying Li

Ling Su

Farbod Tabatabai

Rishi Ranjan

Brett Schein

Fan Sun

Louay Jalloul

Anoop Singh Tomar

William Charles Fujimoto

Kodanda Ram Reddy Engala

Joseph Saada

Vara Prasad

Javvadi Varaprasad

Paulraj Arogyaswami

Ahmad Mohammed

Walid Ali-Ahmad

Somichetty Gowrisankar

Erik Westman

Varaprasad Javvadi

Kamesh Medepalli

Kirshna Gomadam

Sanjai Kohil

Lakshmi Pradeep

Yanzi Zhu

Krishna Gomadam

Apparatuses, methods, and systems for per carrier scaling of a cancellation pulse of a multi-carrier signal are disclosed. One method includes identifying a target PAPR (peak to average power ratio) for the multi-carrier signal, identifying a target EVM (error vector magnitude) for each of cj carriers of the multi-carrier signal, setting a scaling factor for each of the cj carrier to an initial value, or each carrier cj adjusting the scaling factor for the carrier cj until a measured EVM of the carrier cj satisfies the target EVM for the subcarrier cj while maintaining the PAPR target for the multi-carrier signal, and the cancellation pulse of the multi-carrier signal with the adjusted scaling factor for each of the cj carriers.

Per carrier scaling of a cancellation pulse of a multi-carrier signal

In one embodiment, a method includes sending SRS received from a plurality of UEs associated with the base station to a DU associated with the base station, receiving information regarding a subset of the plurality of UEs selected for downlink data transmissions for an RBG, multi-user data to be transmitted to UEs in the subset, and identities of selected beams among a plurality of pre-determined beams to be associated with the UEs in the subset from the DU, where each of the plurality of pre-determined beams corresponds to a DFT vector, computing a precoding matrix for the RBG based on IDFT vectors corresponding to the selected beams, preparing pre-coded multi-user data by applying the precoding matrix to the multi-user data, and transmitting the pre-coded multi-user data to the UEs in the subset for the RBG using MIMO technologies.

User grouping for multi-user MIMO

An antenna system comprising (1) a plurality of transceivers capable of being calibrated over the air to improve beamforming and (2) at least one controller communicatively coupled to the plurality of transceivers, wherein the controller (A) identifies a set of partially overlapping subgroups that include the plurality of transceivers, (B) obtains leakage measurements taken in connection with signals emitted by at least one transceiver included in each of the partially overlapping subgroups, (C) identifies, within the leakage measurements, a subset of leakage measurements taken in connection with an overlapping transceiver and multiple non-overlapping transceivers included in the set of partially overlapping subgroups, and (D) calibrates, based at least in part on the subset of leakage measurements, the plurality of transceivers with respect to at least one feature to improve beamforming. Various other apparatuses, systems, and methods are also disclosed.

Apparatus, system, and method for calibrating transceivers in beamforming antennas over the air without calibration circuitry

Apparatuses, methods, and systems for coordinated beamforming in a wireless mesh network, are disclosed. One system includes a network that includes a plurality of nodes connected through wireless links, and a controller. The wireless links including aggressor links and victim links wherein the aggressor links interfere with the victim links. The controller is operative to identify aggressor links and victim links of a group of nodes of the plurality of nodes, coordinate beam scans of the one or more victim receive nodes associated with the victim links of the group, coordinate transmission of one or more aggressor transmit nodes associated with the aggressor links of the group, characterize or receive characterizations of measured interference at the one or more victim receive nodes during the coordinated beam scans, and select beamforming coefficients for the victim receive nodes based at least on the characterizations of the measured interference.

Coordinated beamforming of nodes in a wireless mesh network

In one embodiment, a method includes receiving SRS received from a plurality of UEs associated with the base station from an RU associated with the base station, estimating strengths or signal-to-noise ratios (SNRs) for pre-determined beams for each of the plurality of UEs based on the received SRS, selecting a subset of the plurality of UEs to which downlink data is to be transmitted for a RBG in a TTI based on the estimated strengths or SNRs of the pre-determined beams for the plurality of UEs, computing a precoding matrix for the RBG based on the selected subset, preparing multi-layered UE data for the RBG based on the selected subset and the computed precoding matrix, sending the multi-layered UE data and the precoding matrix for the RBG to the RU, where the RU transmits pre-coded multi-layered UE data to the UEs in the subset using MIMO technologies.

Hybrid user selection and beamforming method for multi-user MIMO

In one embodiment, an interference-management system of a multi-hop wireless network may access an interference map indicating interference among network nodes, identify a plurality of links between network nodes, wherein one or more of the links are identified as golden links, generate a factor-graph representation comprising a set of first vertices corresponding to a respective set of second vertices, wherein each vertex pair is associated with an identified link, wherein, for each vertex pair, the first vertex is a variable node representing beamforming weight variables associated with the link and each second vertex is a function node representing a capacity equation associated with the link, wherein each vertex pair is assigned a capacity weight from a set of non-equal capacity weights based at least in part on the identified golden links, and determine one or more adjustments to one or more beamforming weights to reduce interference among the network nodes.

Interference management in a multi-hop wireless network

Coordinated beamforming of receiving nodes in a wireless mesh network

Apparatuses, methods, and systems for coordinated beamforming in a wireless mesh network, are disclosed. One system includes a network that includes a plurality of nodes connected through wireless links, and a controller. The wireless links including aggressor links and victim links wherein the aggressor links interfere with the victim links. The controller is operative to identify the aggressor links and the victim links of a group of nodes of the plurality of nodes, coordinate beam scans of aggressor transmitter nodes associated with the aggressor links, coordinate reception of one or more victim receive nodes associated with the victim links, characterize or receive characterizations of measured interference at the one or more victim receive nodes during the coordinated beam scans, and select beamforming coefficients for the aggressor transmitter nodes based at least on the characterizations of the measured interference.

Coordinated beamforming of transmitting nodes in a wireless mesh network

In one embodiment, a method includes accessing steady-state operational parameters for each of a plurality of network nodes of the multi-hop wireless network recorded during a period of steady-state operation, identifying a plurality of first network nodes and a plurality of second network nodes, wherein each of the first network nodes is determined to need a planned reset, and wherein each of the second network nodes previously established one or more wireless connections with one or more of the first network nodes, respectively, adjusting operational settings of each of the second network nodes to establish one or more temporary wireless connections between one or more pairs of second networks nodes, respectively, resetting each of the first network nodes, adjusting operational settings of each of the second network nodes based on the steady-state operational parameters to reestablish the one or more previously established wireless connections with the first network nodes.

Igniting network nodes in a multi-hop wireless network

In one embodiment, an interference-management system of a multi-hop wireless network may access an interference map indicating interference among a plurality of network nodes of the multi-hop wireless network. The interference-management system may determine, for a first pair of network nodes of the multi-hop wireless network, a plurality of adjustments to one or more beamforming weights associated with beamforming antennae of the first pair of network nodes to reduce interference among the network nodes of the multi-hop wireless network, wherein the plurality of adjustments correspond to a respective plurality of communication paths connecting the first pair of network nodes on the multi-hop wireless network. The interference-management system may exclude one or more adjustments from the plurality of adjustments based on a determination that the one or more adjustments correspond to one or more unsuitable communication paths, respectively.

Systems and associated methods for improved beamforming of the phase array antenna are disclosed herein. In one embodiment, a communication system for wireless signals has a phase array antenna having a plurality of individual antennas and a plurality of electrically conductive traces. The individual traces electrically connect corresponding individual antennas with a transmitter. The lengths of individual traces Ti, Tk satisfy equation Abs((Ti&#x2212;Tk)mod(&#x3bb;))&#x3c;&#x3bb;/B, where &#x3bb; is a wavelength of the wireless signal and &#x3bb;/B is a fraction of &#x3bb;. A beamformer performs amplitude and/or phase adjustment to the wireless signal to be applied to each individual trace, wherein the beamformer operates to cancel phase offsets generated by unequal trace lengths.

Traces between phase array antenna and radio frequency integrated circuit in mm wave systems

Apparatuses, methods, and systems for calibrating of an antenna array that uses low-resolution phase shifters, are disclosed. On method includes generating a codebook of phase-shifter setting selections for each of a plurality of antenna elements of an antenna array including communicating a wireless signal between an external calibration antenna and the antenna array through a beam formed by a reference antenna element of the antenna array and an antenna element of the antenna array being calibrated, measuring a signal power of the communicated wireless signal for each of N settings of a digitally selected phase shifter associated with the antenna element of the antenna array being calibrated, and estimating a virtual signal power of each of M settings of the digitally selected phase shifter based on the signal power measurements of the N settings of the digitally selected phase shifter, wherein M is greater than N.

Calibration of an antenna array that uses low-resolution phase shifters

In one embodiment, a method includes determining a plurality of network nodes of a multi-hop wireless network, wherein each network node comprises an array of beamforming antennae; assigning to each network node in a first subset a first bipartite-graph polarity; assigning to each network node in a second subset a second bipartite-graph polarity; and configuring the multi-hop wireless network according to a bipartite-graph representation of the multi-hop wireless network. During first time slots network nodes of the first bipartite-graph polarity transmit to network nodes of the second bipartite-graph polarity and network nodes of the second bipartite-graph polarity receive from network nodes of the first bipartite-graph polarity. During second time slots that alternate with the first time slots, network nodes of the second bipartite-graph polarity transmit to network nodes of the first bipartite-graph polarity and network nodes of the first bipartite-graph polarity receive from network nodes of the second bipartite-graph polarity.

Polarity assignment in a multi-hop wireless network

In one embodiment, an interference-management system of a multi-hop wireless network may access an interference map indicating interference among network nodes, each network node comprising sectors that each comprise an array of beamforming antennae. The interference-management system may identify links between network nodes, each link being associated with a transmitting (TX) beamforming weight variable and a receiving (RX) beamforming weight variable. The interference-management system may generate a factor-graph representation of the multi-hop wireless network comprising a first set of vertices corresponding to a second set of vertices, each vertex pair being associated with an identified link, wherein each vertex pair comprises a variable node and a function node, and wherein messages passed between the nodes of a first vertex pair are derived at least in part based on messages previously passed between the nodes of one or more vertex pairs.

Growing community of inventors

Mountain View, CA, United States of America

Djordje Tujkovic