Technology for simplified multimode signaling includes determining first and second self -terms, cross coupling -terms, and a delay skew term. For each communication link bundled in groups, the signals can be modulated as a superposition of the signals delayed and weighted based on the first and second self -terms, the cross coupling -terms and the delay skew term.

A method for correction of an impulse response of a multipath propagation channel. Such a method includes at least one iteration of the following acts: obtaining a current impulse response of the propagation channel; estimating a temporal shift between the current impulse response and a reference impulse response of the propagation channel; and correcting the current impulse response based on at least the temporal shift, delivering a corrected impulse response.

System and method for beamspace nonlinear equalization in a plurality of parallel channels includes: receiving M parallel signals for transmission by N channels, respectively, wherein M is an integer greater than or equal to 1 and N is an integer greater than 1; performing a linear transfer function on each of the M parallel signal by a finite impulse response (FIR) filter; adding FIR filter tap outputs to each M parallel signals, respectively; phase shifting an output of a respective FIR filter per each of the M parallel signals to generate M intermediate channelized output signals per each of the N channels; summing, by a single summer, the M intermediate channelized output signals across the N channels to produce M channelized polyphase output signals; serializing the M channelized polyphase output signals to generate serialized M polyphase output signals; and equalizing the serialized M polyphase output signals to produce a linearized signal in beamspace.

Methods and apparatuses are presented to generate, and verify reception of, ultra wideband (UWB) communications, e.g., to perform secure UWB ranging. Verifier and prover messages may be encoded on top of random cryptographically secure training sequence (STS) of pulses, organized in blocks such that a given block corresponds to a given message bit. In some scenarios, a first STS may be encoded using a verifier message not known to a recipient device. A second STS may be received from the recipient device, encoded with an unknown prover message. A third STS may also be received, encoded with an authentication message generated using the verifier message and the authentication message. Verification of the authentication message can therefore confirm that the recipient device received the first STS, and that the recipient device is the authentic source of the second STS. Thus, the second STS may be relied upon, e.g., for ranging calculations.

A timing estimation device according to the present invention includes a received signal memory that outputs a plurality of sample groups each of which is a first number of samples extracted at symbol rate intervals from an oversampled received signal containing a known sequence, with shifting their leading positions by one sample from each other, a reliability calculation unit that calculates a channel impulse response for each of the sample groups, based on the sample group, generates a replica of the received signal using the channel impulse response and the known sequence, and calculates a reliability value based on the sample group, the replica, and the channel impulse response, and a timing estimation unit that estimates a preceding wave arrival timing and a delayed wave arrival timing, based on the reliability value.

This disclosure relates to techniques for performing secure ranging wireless communication. A first wireless device may receive a ranging packet from a second wireless device in a wireless manner. The ranging packet may include a first random sequence portion and a second random sequence portion. The first wireless device may perform one or more channel and noise estimations for the ranging packet. The first wireless device may perform one or more security checks for the ranging packet based on any or all of the first random sequence portion, the second random sequence portion, or the channel and noise estimation(s).

Wireless communication wherein channel estimation accuracy is improved while keeping the position of each bit in a frame, even when a modulation system having a large modulation multiple value is used for a data symbol. An encoding operation encodes and outputs transmitting data (bit string) and a bit converting operation converts at least one bit of a plurality of bits constituting a data symbol to be used for channel estimation, among the encoded bit strings, into 1 or 0. A modulating operation modulates the bit string inputted from the bit converting operation by using a single modulation mapper and a plurality of data symbols are generated.

A transmission device according to the disclosure includes a driver section that is able to transmit a data signal by using three or more predetermined number of voltage states and set voltages in each of the voltage states; and a control section that sets an emphasis voltage that is based on a transition among the predetermined number of the voltage states, and thereby causes the driver section to perform emphasis.

In accordance with a first aspect of the present disclosure, a system is provided for facilitating detecting an unauthorized access to an object, the system comprising: a plurality of ultra-wideband (UWB) communication nodes; a controller operatively coupled to said plurality of UWB communication nodes, wherein the controller is configured to: cause at least one of the UWB communication nodes to transmit one or more UWB messages to other UWB communication nodes of said plurality of UWB communication nodes; receive a channel impulse response (CIR) estimate and/or one or more parameters relating to said CIR output by the UWB communication nodes in response to receiving said UWB messages; analyze said CIR estimate and/or said parameters relating to the CIR to detect said unauthorized access to the object. In accordance with a second aspect of the present disclosure, a corresponding method is conceived for facilitating detecting an unauthorized access to an object. In accordance with a third aspect of the present disclosure, a computer program is provided for carrying out said method.

A ceiling fan or similar air-moving device can include a motor for rotating one or more blades to drive a volume of air about a space. A connector can be used to connect the blade to a blade iron to mount the blade to the motor. The connector can include a set of receptacles configured to insert into openings on the blade, with the set of receptacles connected by a set of arms. A set of mount posts on the blade iron can seat within the receptacles to mount the blade to the blade iron.