A communication device is provided that estimates one or more disturbance values associated with one or more components of the communication device, and adjusts the communication device to change a received power of the output signal. The communication device includes a transmitter having a seed laser configured to provide an amount of bandwidth for an output signal, an Erbium-doped fiber amplifier (EDFA) configured to increase an amplitude of the output signal, and a single mode variable optical attenuator (SMVOA) configured to decrease the amplitude of the output signal.

This invention presents a channel emulator for testing a multi-user multiple input multiple output (MU-MIMO) wireless communication system using an over-the-air (OTA) connection between the antennas of a base station (BS) and the channel emulator. It uses pilot signals with special structures to estimate the channel matrix between the BS and the channel emulator, equalizes the channel when performing emulation of the channels between the BS and a plural of user equipment (UEs) in MU-MIMO communication.

A receiving device includes a reception unit 10 that samples a signal to be measured a transmitted from a DUT 2 and acquires a sample signal d; an FFT processing unit 21 that performs an FFT process by multiplying the sample signal; a signal length calculation unit 31 that calculates a signal length of the signal to be measured from the sample signal; a comparing unit 33 that compares the calculated signal length of the signal to be measured with a first FFT length conforming to a communication standard; and an FFT length setting unit 34 that, when as a result of the comparison by the comparing unit, the signal length is shorter than the first FFT length, sets a second FFT length shorter than the signal length of the signal to be measured, as the FFT length of the FFT process by the FFT processing unit.

A receiving device includes a reception unit 10 that samples a signal to be measured a transmitted from a DUT 2 and acquires a sample signal d; an FFT processing unit 21 that performs an FFT process by multiplying the sample signal; a signal length calculation unit 31 that calculates a signal length of the signal to be measured from the sample signal; a comparing unit 33 that compares the calculated signal length of the signal to be measured with a first FFT length conforming to a communication standard; and an FFT length setting unit 34 that, when as a result of the comparison by the comparing unit, the signal length is shorter than the first FFT length, sets a second FFT length shorter than the signal length of the signal to be measured, as the FFT length of the FFT process by the FFT processing unit.

Methods and apparatus are disclosed for searching and tracking intercell interference in communication networks. In an exemplary embodiment, a method is provided that includes operations of receiving a noise covariance matrix and generating a beam sub-space from the noise covariance matrix. The beam sub-space includes one or more sub-space beams. The method also includes determining a set of selected sub-space beams having energy levels that exceed a threshold, calculating an Eigenvector decomposition for the set of selected sub-space beams to identify an Eigenspace of interference energy, and tracking the Eigenspace over time.

An object is to provide a wireless terminal and a communication quality prediction method for enhancing the versatility of communication quality prediction. In the wireless terminal and the communication quality prediction method according to the present invention, objects are extracted from surrounding environment information such as a camera image collected by a surrounding environment information collection unit, the objects are classified into predetermined categories (for example, whether the extracted objects are persons or machines or whether their moving speeds are high or low), and an image is reconstructed for each category. It is possible to predict communication quality based also on, for example, operations or materials of the objects, by performing machine learning of the communication quality after reconstructing the image for each category.

The present invention improves efficiency of operator's work by automating template registration of an unregistered transmission apparatus. A transmission apparatus recognition apparatus includes a receiving unit, a recognition unit, and a template feature registration unit. The receiving unit receives a signal wirelessly transmitted from a transmission apparatus. The recognition unit calculates a degree of similarity between a sample feature generated from a received signal received by the receiving unit and template features registered in advance, compares the degree of similarity with recognition threshold value, and thereby recognizes the transmission apparatus. The template feature registration unit generates a template feature from a sample feature that failed to be recognized by the recognition unit.

The present invention improves efficiency of operator's work by automating template registration of an unregistered transmission apparatus. A transmission apparatus recognition apparatus includes a receiving unit, a recognition unit, and a template feature registration unit. The receiving unit receives a signal wirelessly transmitted from a transmission apparatus. The recognition unit calculates a degree of similarity between a sample feature generated from a received signal received by the receiving unit and template features registered in advance, compares the degree of similarity with recognition threshold value, and thereby recognizes the transmission apparatus. The template feature registration unit generates a template feature from a sample feature that failed to be recognized by the recognition unit.

The disclosure relates to a method of detecting whether an external object is in proximity to an electronic device and an electronic device supporting the same. An electronic device according to an embodiment may include: a wireless communication circuit; an antenna electrically connected to the wireless communication circuit and configured to be fed with power from the wireless communication circuit at a first point; a voltage detector including circuitry configured to detect a peak voltage applied to the antenna; and a processor electrically connected to the voltage detector and the wireless communication circuit. The processor may be configured to: determine whether an external object is within a specified proximity to the electronic device based on the peak voltage detected by the voltage detector; and control the magnitude of power applied to the antenna via the wireless communication circuit based on a determination that the external object is within the specified proximity to the electronic device.

A communication device according to an embodiment is capable of communicating with another communication device via a first network and a second network each transmitting radio signal data by different communication methods. The communication device includes: a first communicator capable of communicating with another communication device via the first network; a second communicator capable of communicating with another communication device via the second network; a delay parameter acquirer to acquire a delay parameter of the first network; and a delay parameter reflector to reflect the delay parameter of the first network acquired by the delay parameter acquirer on a delay parameter of the second network.