A calibration circuit includes a selection unit, a power detector, an analog-to-digital converter and a calibrator. The selection unit is connected to the plurality of channels, selects two channels from among the plurality of channels, provides a test signal to the selected two channels, and receives a test result signal from the selected two channels. The power detector detects power of the selected two channels. The analog-to-digital converter performs an A/D conversion on an output of the power detector. The calibrator calibrates the phases and the gains between the plurality of channels based on an output of the analog-to-digital converter. One of the plurality of channels is set as a reference channel, phases and gains of remaining channels other than the reference channel among the plurality of channels are sequentially optimized based on the reference channel, and a phase and a gain of the reference channel is optimized.

A method for recommending an installation position of a base station, a storage medium, a mower, and a mobile electronic device are provided. The method acquires satellite observation data at a plurality of sampling points along a boundary of a target map; determining target sampling points satisfying a preset condition according to satellite observation data at each sampling point; determining common satellite observation frequency bands according to satellite observation data at the target sampling points; determining the number of the common satellite observation frequency bands at each sampling point according to the common satellite observation frequency bands and the satellite observation data at each sampling point; and determining recommendation information of the installation position of the base station according to the number of the common satellite observation frequency bands at each sampling point.

The technology includes a method, computer medium, and system for remote testing over-the-air (OTA) audio quality using a test platform positioned at core network, the test platform comprising first and second cellular handsets and bridging logic that interconnects, controls, and bridges the first and second cellular handsets. The method includes triggering the bridging logic. The bridging logic initiates a first call over the first cellular handset to a tester, and initiates a second call over the second cellular handset to a destination, wherein the second call is initiated over-the-air. The bridging logic and the first and second cellular handsets are positioned in a location that causes routing by a cellular network of the first call over a segment under test. The bridging logic bridging audio between the first and the second calls, including relaying audio. The tester determines that the second call was established based on the relayed audio.

A communication exchange between two wireless communication devices is monitored. A communication device configured to function as a Sniffer device synchronizes the communication device to a frequency and a timing employed between the two wireless communication devices on a main wireless communication channel. The wireless communication exchanges are monitored, in which the wireless communication exchanges are packet-based data exchanges or tone-based data exchanges. The operations for wireless communication exchanges are repeated across a plurality of different frequencies. The communication device then combines a plurality of phase and/or magnitude measurements and determines a value of phase and/or magnitude error introduced by each device based on the combined plurality of phase and/or magnitude measurements.

A system, device and method for optimization of a radiated transmission matrix by the selecting probe antennae and applying a compensation network in the test system are described. Among other benefits, the anechoic chamber in which the DUT is disposed is comparatively small and inexpensive. The time-consuming process of inverse matrix tuning or isolation level checking that plagues known systems, device and methods of testing DUT is substantially avoided. Because of small size of shield box and probe antenna selection algorithm, low path loss and acceptable power in testing can be realized.

A wireless device control circuit with modularized internal circuit architecture and associated wireless communications device are provided. The wireless device control circuit may include a first digital processing circuit and a second digital processing circuit. The first digital processing circuit is arranged to perform first digital processing corresponding to a first predetermined radio frequency band for the wireless communications device, the first digital processing including common processing and a first additional processing. The second digital processing circuit is arranged to perform second digital processing corresponding to a second predetermined radio frequency band for the wireless communications device, the second digital processing including the common processing and a second additional processing. The first digital processing circuit and the second digital processing circuit are identical to each other, and are arranged to perform the first and the second digital processing according to a first predetermined configuration and a second predetermined configuration, respectively.

A method for connecting microwave antennas to a blockchain network includes obtaining first positional data of the first microwave antenna, obtaining second positional data of the second microwave antenna, setting a first alignment position based on the first positional data, and a setting second alignment position based on the second positional data, positioning the first microwave antenna according to the first alignment position, positioning the second microwave antenna according to the second alignment position, measuring a received signal level (RSL) corresponding to a signal level between the first and second microwave antennas while the antennas are aligned according to the first and second alignment positions, comparing, the measured RSL to a predetermined RSL corresponding to an acceptable signal level, and determining that the first and second alignment positions correspond to at least an acceptable signal level between the first and second microwave antennas when the measured RSL is greater than the predetermined RSL.

A calibration circuit includes a selection unit, a power detector, an analog-to-digital converter and a calibrator. The selection unit is connected to the plurality of channels, selects two channels from among the plurality of channels, provides a test signal to the selected two channels, and receives a test result signal from the selected two channels. The power detector detects power of the selected two channels. The analog-to-digital converter performs an A/D conversion on an output of the power detector. The calibrator calibrates the phases and the gains between the plurality of channels based on an output of the analog-to-digital converter. One of the plurality of channels is set as a reference channel, phases and gains of remaining channels other than the reference channel among the plurality of channels are sequentially optimized based on the reference channel, and a phase and a gain of the reference channel is optimized.

A test and measurement device includes a signal generator to generate a test signal, a signal analyzer to receive a response signal from an adaptive system under test (SUT), communications ports to allow reception of the response signal, and one or more processors to send a signal to the signal generator to generate a first test signal, receive a response signal from the signal analyzer, measure performance of the response signal, and report the performance to at least one of the SUT and a user workspace on the test and measurement device. A method of testing a system under test (SUT) includes generating and sending a test signal with a signal generator, receiving a response signal from the SUT at a signal analyzer, measuring performance of the response signal with respect to the test signal, and reporting the performance to at least one of the SUT and a user workspace.

In a general aspect, vapor cell sensors are used to perform OTA testing of cellular base stations. In some implementations, a system for performing OTA testing of a cellular base station includes a vapor cell sensor including a vapor having Rydberg states and a control system communicably coupled to the vapor cell sensor and configured to tune the vapor cell sensor to a carrier frequency of RF radiation emitted from the cellular base station; receive a first set of optical signals generated based on an interaction between the vapor and a synchronization signal; tune the vapor cell sensor to a harmonic of the carrier frequency; receive a second set of optical signals generated by the vapor cell based on an interaction between the vapor and the RF radiation; convert the first and second sets of optical signals to digital data; and process the digital data to detect a condition of the cellular base station.