A communication device includes: a plurality of wireless communication sections, each of which is configured to wirelessly receive a signal from another communication device; and a control section configured to perform a detection process of detecting specific elements with regard to a plurality of correlation computation results, each of which is obtained by correlating a first signal that is transmitted from the other communication device and each of second signals at the designated interval and includes a correlation value indicating magnitude of correlation between the first signal and the second signal as an element obtained at the designated interval, and control a change process of treating a wireless communication section having earliest time corresponding to the specific element as a first wireless communication section among the plurality of wireless communication sections, treating the other wireless communication section as a second wireless communication section among the plurality of wireless communication sections.

In accordance with a first aspect of the present disclosure, a communication device is provided, comprising: a receiver circuit configured to receive a signal; a controller configured to control said receiver circuit, wherein said controller is configured to cause said receiver circuit to operate either in a complex receiver mode or in a real receiver mode; wherein the controller is configured to cause said receiver circuit to operate in the real receiver mode until the signal is successfully acquired. In accordance with a second aspect of the present disclosure, a corresponding method of operating a communication device is conceived.

A system for increased safety levels at swimming venues includes an UWB tag, a control terminal, and at least three base stations. The UWB tag transmits positioning data of the tag worn by a swimmer and transmits a signal to the at least three base stations. The base stations receive the signal and the positioning data, record time when receiving same, and send the signal, the positioning data, and the time to the control terminal. The control terminal calculates position of the swimmer's UWB tag according to the positioning data and the time when a period of attenuation or disappearance of the wireless connection signal from the immersed UWB tag exceeds a first preset time, generates alarm information, and sends the position of the UWB tag and the alarm information to notify a security officer.

Systems and methods of segment splitting across frames include a first ultra-wideband (UWB) device that determines to split a scrambled timestamp sequence (STS) into at least a first portion and a second portion of the STS, for transmission to a second UWB device. The first UWB device may transmit a first frame comprising the first portion of the STS to the second UWB device. The first UWB device may transmit a second frame comprising the second portion of the STS to the second UWB device.

To calculate the propagation times of signals transmitted and received between the devices more easily and accurately. There is provided a wireless communication device comprising a control section configured to control transmission and reception of a wireless signal by an antenna in conformity with a designated communication standard, wherein the control section controls a timing of causing the antenna to transmit a second signal in response to a first signal received by the antenna, on a basis of fixed time and delay time related to internal transfer in the wireless communication device, the fixed time being decided in advance.

A method for an ultra-wide band (UWB) anchor device for adjusting a receiving window for waiting to receive a message transmitted from a user terminal to perform UWB ranging. The method includes setting a length of the receiving window to an initial value, counting a number of reception failures of the message until the message is received, and performing the UWB ranging based on the length of the receiving window being set to the initial value or adjusting the initial value, based on the number of reception failures.

A method is provided for radar ranging using an IR-UWB radar transceiver. The range is determined by measuring a time required by a transmitted pulse to be reflected by an object and returned to the transceiver. The method includes transmitting a ranging signal having a predetermined sequence of positive and negative pulses using a transmitter of the transceiver. A receiver of the transceiver receives a signal having a reflected portion and a feedthrough portion. In the method, the receiver cancels the feedthrough portion using a delayed pulse polarity signal such that when the delayed pulse polarity signal is multiplied and accumulated with the received signal, the feedthrough portion is canceled, and the reflected portion is amplified. In another embodiment, a transceiver is provided that cancels the feedthrough portion while amplifying the reflected portion. Cancelling the feedthrough portion allows short-range operation by removing a blind range of the transceiver.

A method of transmitting signals from a first node having multiple transceivers to a second node is disclosed. The method comprises receiving a message from the second node at the first node, wherein the message is received by each of a plurality of transceivers of the first node; and transmitting by each of the plurality of transceivers a respective data frame to the second node in response to the message; wherein each transceiver initiates the transmission of its respective data frame a predetermined time period after receipt of the message by the transceiver; and wherein the transmissions of the data frames from the plurality of transceivers overlap. The data frames may form part of a two-way ranging exchange.

An electronic device according to an embodiment of the disclosure may receive an advertising frame transmitted by an external electronic device through the communication circuit through ultra-wideband (UWB) communication, may receive at least one frame among the advertising frames in a first decision period, may determine whether the number of times an angle based on the at least one frame received in the first decision period is within a specified angle range satisfies a specified condition, and may determine whether the electronic device points to the external electronic device according to whether the specified condition is satisfied.

A contact and ranging system includes a first device that includes a first transceiver, a second transceiver, and a controller to control the first transceiver and the second transceiver of the first device. The first device is operable to determine a distance between the first device and a second device. The first transceiver is configured to perform a discovery operation. Other devices are discovered and added to a list of paired devices. A ranging schedule for each paired device in the list of paired devices is determined. The second transceiver is configured to perform a ranging operation. The ranging and response transmissions are transmitted and received by a pair of devices, such that a range between the pair of devices is determined based upon a time of flight between the pair of devices. The range between the pair of devices is matched with a timestamp and stored in a database.