Abstract: A Wireless LAN (WLAN) Li-Fi transceiver includes a Wi-Fi device and an Analog Front-End (AFE). The Wi-Fi device is configured to produce a spatial stream carrying data, and to produce from the spatial stream In-phase and Quadrature (I/Q) signals for transmission over a radio channel having a predefined Radio Frequency (RF) band. The Analog Front-End (AFE) is configured to modify the I/Q signals, or modify operation of the Wi-Fi device, for producing a real Li-Fi signal in a predefined optical band, and to transmit the data carried by the spatial stream to a remote Li-Fi receiver by driving an optical emitter with the real Li-Fi signal.

Abstract: A Wireless Local-Area Network (WLAN) access point includes a WLAN transmitter, a WLAN receiver, and a processor. The WLAN transmitter is configured to transmit WLAN packets and to send a timing-synchronization signal. The WLAN receiver is configured to receive echo packets including reflections from an object of the transmitted WLAN packets, to receive the timing-synchronization signal, and to time-synchronize the echo packets and the corresponding WLAN packets. The processor is configured to (a) in response to a gap in the received echo packets, generate one or more synthetic echo packets by interpolating over two or more of the time-synchronized received echo packets, to consequently derive a sequence of equally-spaced echo packets, (b) using the derived sequence of equally-spaced echo packets and the WLAN packets estimate one or more parameters of the object, and (c) output the estimated parameters to a user.

Abstract: A wireless device includes multiple RF chains, one or more processing modules, a switching circuit and a processor. The RF chains operate in multiple RF bands, and at least one RF chain is configurable to operate at a RF band selected from the RF bands. The processing modules are configurable to process signals communicated with the RF chains. The switching circuit routes signals between RF chains and processing modules in accordance with a routing plan. In response to an event that warrants reconfiguration, the processor re-allocates resources, including (i) allocating one or more RF chains to respective RF bands, (ii) allocating one or more processing modules to process signals associated with the RF bands, and (iii) setting the routing plan to route signals between pairs of RF chains and processing modules allocated to a common RF band. The processor communicates wirelessly with remote devices in accordance with the operational reconfiguration.

Abstract: A method for estimating a location of a target Wireless Local-Area Network (WLAN) device includes obtaining relative locations of three or more WLAN devices. Respective distances are measured between each of the WLAN devices and the target WLAN device. The location of the target WLAN device is estimated based on the locations of the WLAN devices and on the measured distances, wherein measuring a distance between a WLAN device and the target WLAN device includes: exchanging WLAN signals, detecting a first leakage signal by a receiver of the WLAN device, detecting a second leakage signal by the receiver of the target WLAN device, calculating time differences between a time a WLAN signal was sent and a time a leakage signal was detected, and subtracting the time differences one from the other to obtain a time-of-flight that corresponds to the distance between the WLAN device and the target WLAN device.

Abstract: A Wireless Local-Area Network (WLAN) access point includes a WLAN transmitter, a WLAN receiver, and a processor. The WLAN transmitter is configured to transmit WLAN packets via one or more transmit antennas, and to send a timing-synchronization signal over an internal interface. The WLAN receiver is configured to receive, via one or more receive antennas, echo packets including reflections from an object of a selected subset of the WLAN packets transmitted by the WLAN transmitter, to receive the timing-synchronization signal from the WLAN transmitter over the internal interface, and to time-synchronize the echo packets and the corresponding WLAN packets using the timing-synchronization signal. The processor is configured to estimate one or more parameters of the object based on the time-synchronized echo packets and WLAN packets, and to output the estimated parameters to a user.

Abstract: A wireless transmitter includes a radio interface and transmitter circuitry. The radio interface includes multiple transmit antennas. The transmitter circuitry is configured to hold multiple steering matrices specifying weights to be applied to one or more spatial streams transmitted via the multiple transmit antennas to a receiver that includes one or more receive antennas, the multiple steering matrices are specified over multiple sub-carriers, to calculate smoothed weights, by applying to the weights of the steering matrices phase-only corrections that reduce phase variations among the weights of the steering matrices over the sub-carriers, and to transmit to the receiver beam-formed transmissions of the one or more spatial streams over the sub-carriers, by applying to the spatial streams the smoothed weights in the respective sub-carriers.

Abstract: A wireless device (24) includes a modem (56) and processing circuitry (50, 52). The modem is configured to modulate signals for transmission over wireless channels, and demodulate signals received over the wireless channels. The processing circuitry is configured to receive a first frame from a second wireless device over a wireless channel via the modem, and transmit a second frame to the second wireless device via the modem over the wireless channel, to calculate a first Channel State Information (CSI) based on the first frame, to calculate a first normalized CSI by applying to the first CSI a normalization procedure, and generate, based on the first normalized CSI, a first key that due to the normalization procedure has an increased likelihood to match a second key generated in the second wireless device based on the second frame, and to communicate securely with the second wireless device over the wireless channel using the first key.

Abstract: An apparatus includes a Base Station (BS) that includes an antenna array and circuitry. The antenna array is configured to transmit downlink transmissions and to receive uplink transmissions. The circuitry is configured to generate secret bits to be used for securing uplink transmissions from legitimate user devices, and to distribute the secret bits over one or more data streams destined to the legitimate user devices, to further generate one or more jamming streams, and to apply to the jamming streams beamforming that directs the jamming streams away from the legitimate user devices, to transmit the data streams and the jamming streams using the antenna array, to receive, via the antenna array, data that was encrypted by a legitimate user device based on the secret bits, and to recover the data by decoding the encrypted data using the secret bits.

Abstract: A wireless access point (AP) includes multiple transmit antennas and circuitry. The circuitry is configured to transmit multiple sounding frames to a receiver that includes one or more receive antennas, the sounding frames are transmitted via respective different partial subgroups of the transmit antennas, to receive from the receiver feedback information that specifies for each of the sounding frames a respective channel between the transmit antennas in the respective partial subgroup and the receive antennas, and, to determine a steering matrix based on the feedback information, and transmit to at least the receiver via at least some of the transmit antennas using the steering matrix.

Abstract: A Wireless Local Area Network (WLAN) device includes multiple transmission/reception (TX/RX) chains, and control circuitry. The TX/RX chains include first TX/RX chains tuned to a first channel, and second TX/RX chains that are selectively tuned to the first channel or to a different second channel. The control circuitry is configured to receive, via at least one of the TX/RX chains, a frame preamble signal including a first part and a second part, which are both transmitted over either the first channel alone or over both the first and second channels, and the first part is decoded from the first channel alone, to make a decision, before receiving the entire first part, whether the second part is transmitted over the first channel alone or over both the first and second channels, and to tune the second TX/RX chains to the first channel or to the second channel, based on the decision.

Abstract: A method includes, in a Wireless Local Area Network (WLAN) device that includes one or more primary transmission/reception (TX/RX) chains and an auxiliary reception (RX) chain, defining a first operational mode in which priority is given to transmission of the primary TX/RX chains, and a second operational mode in which the priority is given to reception of the auxiliary RX chain. communication is performed on a given communication channel using the primary TX/RX chains, and evaluation of signal activity is performed on one or more alternative communication channels using the auxiliary reception (RX) chain, while operating the WLAN device alternately in the first and second operational modes.

Abstract: A method includes, in a Wireless Local Area Network (WLAN) device, communicating on a given communication channel using one or more primary transmission/reception (TX/RX) chains. Concurrently with communicating on the given communication channel using the primary TX/RX chains, signal activity is evaluated on one or more alternative communication channels using an auxiliary reception (RX) chain whose hardware is partially shared with one of the primary TX/RX chains.

Abstract: A method for communication includes accepting in an Access Point (AP) data items for transmission over a wireless channel to multiple terminals served by the AP. Aggregate airtimes, which were previously allocated to the respective terminals on the wireless channel, are assessed. Transmission of the data items is scheduled depending on the aggregate airtimes.

Abstract: A method for communication includes generating a data transmission for transmission to a target receiver, and generating at least one jamming transmission having an amplitude that changes multiple times during the data transmission. The data transmission is transmitted to the target receiver using an antenna array, and the at least one jamming transmission is simultaneously transmitted using the antenna array.

Abstract: An apparatus for wireless communication includes a plurality of antennas, a master baseband integrated circuit (BBIC) and a slave BBIC. The antennas are configured to communicate a Multiple-Input Multiple-Output (MIMO) signal. The master BBIC is configured to process a first component of the MIMO signal that is communicated via a first subset of the antennas. The slave BBIC is configured to process a second component of the MIMO signal that is communicated via a second subset of the antennas. The master BBIC is further configured to control the slave BBIC so as to jointly communicate the MIMO signal, based on the first and second components, via the entire plurality of the antennas.

Abstract: A method includes operating a communication system (20) that includes a wireless access point (AP—24) and multiple wireless stations (STAs—28), including at least a first STA that is connected to a first endpoint (36) and a second STA that is connected to a second endpoint (36). A communication packet is transferred from the first endpoint to the second endpoint by transmitting the packet from the first STA to the second STA, not via the AP, using an addressing scheme that specifies in the packet respective layer-2 addresses of the first and second STAs but not of the first and second endpoints. In the second STA, the layer-2 address of the second endpoint is resolved, the resolved layer-2 address is inserted into the packet and the packet is forwarded to the second endpoint using the inserted layer-2 address.

Abstract: A wireless Local Area Network (WLAN) device includes a first transceiver and a second transceiver. The first transceiver is configured to communicate on a first frequency band, and includes a first Multi-Chip Module (MCM). The first MCM includes a first Radio-Frequency Integrated Circuit (RFIC) for transmitting and receiving on the first frequency band and a first BaseBand Integrated Circuit (BBIC). The second transceiver is configured to communicate on a second frequency band, and includes a second MCM. The second MCM includes a second RFIC for transmitting and receiving on the second frequency band and a second BBIC that is identical to the first BBIC.

Abstract: A method for communication includes accepting in an Access Point (AP) data items for transmission over a wireless channel to multiple terminals served by the AP. Aggregate airtimes, which were previously allocated to the respective terminals on the wireless channel, are assessed. Transmission of the data items is scheduled depending on the aggregate airtimes.

Abstract: A method includes, in an Access Point (AP) that communicates with one or more wireless communication stations (STAs) in accordance with a communication protocol that permits the STAs to transmit to the AP at bandwidths selected by the STAs without coordination with the AP, evaluating a condition relating to signal quality of at least one of the STAs. A maximum bandwidth is chosen based on the evaluated condition, and the STAs are instructed to transmit to the AP at no more than the chosen maximum bandwidth.

Abstract: A method in a receiver includes receiving from a transmitter a request to provide channel feedback relating to a communication channel between the transmitter and the receiver. A maximum latency after which the channel feedback is expected by the transmitter is assessed. A spectral resolution with which to calculate the channel feedback is selected based on the assessed maximum latency. The channel feedback is calculated with the selected spectral resolution, and the calculated channel feedback is sent to the transmitter within the maximum latency.