23 results about "Null steering" patented technology

In the case that several transmitting elements (e.g., a Tx chain) are simultaneously impaired, at least two different layouts are possible: the defected Tx chains are randomly scattered around the array; or, the defected Tx chains are aligned vertically on a random column (for 12 and 24 defected Tx chains—1 and 2 such columns are randomly chosen, respectively). It can be seen that the throughput is worse when the defected Tx chains are aligned in a column rather than randomly scattered, unless the defective Tx chains are known, in which case it is the opposite. This is because disabling an entire column has the most significant effect on the spatial null steering. When defected Tx chains are known the performance of all layouts are almost the same, though column yields slightly better results due to the antenna subarrays (2 vertical antennas have the same feed, therefore we lose less degrees of freedom).

A null steering adjuster in a stationary wireless network identifies the presence or absence of a current set of phase differences in a dataset. The dataset includes legitimate sets of phase differences detected between radio frequency signals received by multiple antennas from respective legitimate sources. The current set of phase differences is detected between radio frequency signals currently received by the antennas. When the current set of phase differences is absent from the dataset, a null is created in the antenna pattern of the antennas in the direction of the currently-received radio frequency signals. When the current set of phase differences is present in the dataset, the antenna pattern is maintained.

A wireless communication device includes a MIMO antenna array with dual-polarized antennas to receive RF signals in vertical and horizontal polarizations across a plurality of frequency bands. The received RF signals are filtered to isolate signals-of-interest, down-converted and digitized to obtain digitized down-converted signals. The wireless communication device includes a processor to concurrently process the digitized down-converted signals based on configuration of multi-link operation (MLO) parameters in the wireless communication device. The processor performs cross-band correlation between the processed digitized down-converted signals of the first intermediate frequency band and second intermediate frequency band to identify related signal patterns. The processor classifies detected signals based on the cross-band correlation, null steering, and an angle-of-arrival information and controls the wireless communication device to trigger an operational response based on the classified signals and the cross-band correlation.

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a network node may identify, based on a schedule of upcoming transmissions in a cell served by the network node, an upcoming intra-cell interference scenario between a first user equipment (UE) and a second UE. The network node may transmit, to the first UE, an interference indication that indicates the first UE is to perform at least one of: null steering, altering a transmission beam of the first UE, or altering a reception beam of the first UE. Numerous other aspects are described.

A system is disclosed. The system may include a receiver or transmitter node. The receiver or transmitter node may include a communications interface with an antenna element. A controller may include one or more processors and have information of own node velocity and own node orientation relative to a common reference frame. The receiver or transmitter node may be time synchronized to apply Doppler corrections to signals, the Doppler corrections associated with the receiver or transmitter node's own motions relative to the common reference frame, the Doppler corrections applied using Doppler null steering along Null directions. The system may be configured to, via the Doppler null steering, flood a communication data packet to a destination node based on a spatial awareness. The system may limit the flooding to only be towards the destination node and / or for a maximum number of hops.

Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive a control message including an indication of one or more resources for measuring directional intracell interference information. The UE may transmit an intracell interference information report based at least in part on one or more directional intracell interference measurements corresponding to the one or more resources. The UE may receive a beam configuration message comprising an instruction to perform null steering for one or more beams based at least in part on the intracell interference information report.

An antenna null steerer in a wireless network determines the conformance of a radio frequency signal received by multiple antennas to the protocol of the wireless network. When the received radio frequency signal is conformant to the protocol, the current antenna pattern is maintained. When the received radio frequency signal is non-conformant to the protocol, nulls are iteratively generated in the antenna pattern until the RF signal becomes conformant to the protocol and / or the maximum number of nulls are present in the antenna pattern.

According to an example aspect of the present invention, there is provided a method, comprising: receiving from a first wireless device a first transmission comprising information on beamforming and / or null steering for a second transmission from the first wireless device, and controlling a third transmission from a second wireless device to a third wireless device during the second transmission on the basis of the information on beamforming and / or null steering.

In the case that several transmitting elements (e.g., a Tx chain) are simultaneously impaired, at least two different layouts are possible: the defected Tx chains are randomly scattered around the array; or, the defected Tx chains are aligned vertically on a random column (for 12 and 24 defected Tx chains—1 and 2 such columns are randomly chosen, respectively). It can be seen that the throughput is worse when the defected Tx chains are aligned in a column rather than randomly scattered, unless the defective Tx chains are known, in which case it is the opposite. This is because disabling an entire column has the most significant effect on the spatial null steering. When defected Tx chains are known the performance of all layouts are almost the same, though column yields slightly better results due to the antenna subarrays (2 vertical antennas have the same feed, therefore we lose less degrees of freedom).

An antenna array feed network includes two or more antenna elements, a 180° hybrid coupler, one or more combiners, two or more transceiver systems including a secondary transceiver system with a transceiver, a diplexer, and amplifier with each remaining transceiver system including a transceiver, a diplexer, a directional coupler, a RF switch, a preamplifier, a network circulator, a programmable attenuator, and an amplifier. The two or more antenna elements form an antenna array. The 180° hybrid coupler provides amplitude controlled null steering and two separate RF signals for an individual port of the antenna array. The programmable attenuator provides automated null steering algorithms for the antenna array feed network. The analog phase shifter equalizes magnitudes of a phase of the two more antenna elements. The one or more combiners feed two or more transceiver systems into the 180° hybrid coupler or the antenna elements into the 180° hybrid coupler.

A DOA estimation technology implementation method and system based on a spatial domain zero algorithm, comprising: obtaining an array flow type and preprocessing it, then calibrating the amplitude and phase of the obtained zero intermediate frequency signal; calculating adaptive weights by using an anti-interference processing algorithm on the calibrated signal; calculating all spectral peak maximum values by using a DOA estimation algorithm on the calibrated signal; setting a spatial domain search range, and calculating interference null power in the range according to the adaptive weights and the array flow type; setting an interference power threshold as a reference value, and comparing the interference null power and the interference power threshold at the spatial domain search range and the angle corresponding to each spectral peak maximum value; according to the comparison result, if the interference null power is less than the interference power threshold, then the spectral peak maximum value is a determined maximum value point, and the corresponding angle is the incident direction of the interference signal; if not, perform spectral peak zero processing to make the angle information invalid.

An antenna system for electronically transforming shapes of antenna arrays has an array of antennas physically arranged in accordance with a first shape (e.g., circular). When desired, the antennas array is electronically reshaped to effectively transform the array into a different shape (e.g., elliptical) by electronically displacing the phase centers of one or more of the antennas so that the relative coordinates of the phase centers are effectively changed to the new array shape without physically moving the antennas. Thus, for a given situation, the radiation pattern of the antenna array can be effectively and automatically changed to improve performance (e.g., better suppress sidelobes or grating lobes) or perform null steering without physically moving the antennas.

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a network node may identify, based on a schedule of upcoming transmissions in a cell served by the network node, an upcoming intra-cell interference scenario between a first user equipment (UE) and a second UE. The network node may transmit, to the first UE, an interference indication that indicates the first UE is to perform at least one of: null steering, altering a transmission beam of the first UE, or altering a reception beam of the first UE. Numerous other aspects are described.

An antenna array feed network includes two or more antenna elements, a 180° hybrid coupler, one or more combiners, two or more transceiver systems including a secondary transceiver system with a transceiver, a diplexer, and amplifier with each remaining transceiver system including a transceiver, a diplexer, a directional coupler, a RF switch, a preamplifier, a network circulator, a programmable attenuator, and an amplifier. The two or more antenna elements form an antenna array. The 180° hybrid coupler provides amplitude controlled null steering and two separate RF signals for an individual port of the antenna array. The programmable attenuator provides automated null steering algorithms for the antenna array feed network. The analog phase shifter equalizes magnitudes of a phase of the two more antenna elements. The one or more combiners feed two or more transceiver systems into the 180° hybrid coupler or the antenna elements into the 180° hybrid coupler.

This document discloses a solution for performing inter-network beamforming cooperation. According to an aspect, a method comprises: establishing, by a first access node of a first wireless network, inter-network beamforming with a second access node of a second wireless network and acquiring, during the establishment, information indicating that at least one station of the second wireless network has added an identifier of the first access node to a beamforming address set; transmitting, by the first access node, an announcement frame indicating the at least one station of the second wireless network; transmitting, by the first access node, a channel sounding signal; receiving, by the first access node, a beamforming report comprising channel state information from the at least one station of the second wireless network; and performing, by the first access node, null steering beamforming transmission in the first wireless network on the basis of the received channel state information.

The invention relates to a communication apparatus, a method of controlling the communication apparatus, and a computer readable storage medium. A communication apparatus operating as a first access point communicating with a first station apparatus in a first network managed by the communication apparatus includes a transmission unit configured to transmit a first null packet (NDP) to a second station apparatus in a second network managed by a second access point, the second station device transmitting first information on a channel state based on the first NDP; and a control unit configured to perform a null manipulation to the second station device in the second network based on the information transmitted by the second station device.

A system is disclosed. The system may include a receiver or transmitter node. The receiver or transmitter node may include a communications interface with an antenna element and a controller. The controller may include one or more processors and have information of own node velocity and own node orientation relative to a common reference frame. The receiver or transmitter node may be time synchronized to apply Doppler corrections to signals, the Doppler corrections associated with the receiver or transmitter node's own motions relative to the common reference frame, the Doppler corrections applied using Doppler null steering along Null directions. The receiver node is configured to determine a bearing angle based on the signals based on Doppler null steering; and to determine a range based on two-way time-of-flight based ranging signals.

A method, system and apparatus are disclosed for downlink out-of-band interference mitigation. In one embodiment, a network node is configured to perform out-of-band (OOB) null steering and in-band null steering toward at least one direction; and use a constant amplitude precoder to align at least one radiation pattern associated with the OOB and in-band null steering. In one embodiment, a method implemented in a network node includes performing out-of-band, OOB, null steering and in-band null steering toward at least one direction; and using a constant amplitude precoder to align at least one radiation pattern associated with the OOB and in-band null steering.

A system is disclosed. The system may include a receiver or transmitter node. The receiver or transmitter node may include a communications interface with an antenna element. A controller may include one or more processors and have information of own node velocity and own node orientation relative to a common reference frame. The receiver or transmitter node may be time synchronized to apply Doppler corrections to signals, the Doppler corrections associated with the receiver or transmitter node's own motions relative to the common reference frame, the Doppler corrections applied using Doppler null steering along Null directions. The system may be configured to, via the Doppler null steering, at least one of: track an expendable asset of the system relative to a target; discover a rendezvous node; or identify at least one of a network relay node or a relay location for a network relay node.

The application belongs to the technical field of array signal processing, and particularly relates to a towed array target direction estimation method and system based on multi-dimensional null steering. The application can extract cross-aperture phase drift information according to the towed array movement, perform spatial registration and sequential fusion on non-repeated effective aperture data, construct a multi-dimensional null cancellation discriminant based on the phase cancellation relationship between local aperture projection components, extract target pointing parameters, and obtain target direction results, thereby further improving the direction estimation performance. Meanwhile, the de-coherence algorithm is added to more accurately distinguish multiple targets. The application can accurately estimate the directions of coherent multiple targets in a complex engineering environment with limited towed array size.

This document discloses a solution for enabling spatial cooperation in a hidden node scenario. According to an aspect, a method comprises: detecting, by a station of a first wireless network managed by a first access node, that a second access node of a second wireless network is hidden to the first access node; in response to the detecting, transmitting by the station a spatial cooperation request message to the second access node; receiving, by the station from the second access node as a response to the spatial cooperation request message, a spatial cooperation response message comprising at least one information element acknowledging spatial cooperation; after receiving the spatial cooperation response message, receiving by the station a frame from the first access node while the second access node is transmitting another frame and while null steering is performed between the apparatus and the second access node.

A system is disclosed. The system may include a receiver or transmitter node. The receiver or transmitter node may include a communications interface with an antenna element and a controller. The controller may include one or more processors and have information of own node velocity and own node orientation relative to a common reference frame. The receiver or transmitter node may be time synchronized to apply Doppler corrections to signals, the Doppler corrections associated with the receiver or transmitter node's own motions relative to the common reference frame, the Doppler corrections applied using Doppler null steering along Null directions. The receiver node may comprise a correlator configured to process the signals which are based on the Doppler null steering.

Antenna systems having adaptive antenna arrays for use in wireless communication devices are provided. In one example implementation, the antenna system includes a first antenna array include a plurality of antenna elements. The antenna system includes a second antenna array including a plurality of antenna elements. The first and second antenna arrays are each disposed about the periphery of the wireless device. At least one of the first and second antenna arrays is an adaptive antenna array having an active multi-mode antenna. The active multimode antenna can be adapted for configuration in one of a plurality of possible modes. The active multi-mode antenna is associated with a distinct radiation pattern when configured in each of the plurality of possible modes.