Systems and methods are described for performing interference-resistant calibration and compensation of radio-frequency (RF) and analog front-end electronics of antenna-array based receivers during active operation. Examples of systems and methods are described herein that may provide interference-resistant calibration maintenance and ongoing compensation for changing gain and phase in receiver front-end electronic components, due to manufacturing tolerances and operational and environmental factors such as variations in temperature, humidity, supply voltage, component aging, connector oxidation, mechanical stresses and vibration, and/or maintenance operations such as sparing and swapping of cables, front-end electronics modules, and/or associated circuitry.

Systems and methods are described for performing interference-resistant calibration and compensation of radio-frequency (RF) and analog front-end electronics of antenna-array based receivers during active operation. Examples of systems and methods are described herein that may provide interference-resistant calibration maintenance and ongoing compensation for changing gain and phase in receiver front-end electronic components, due to manufacturing tolerances and operational and environmental factors such as variations in temperature, humidity, supply voltage, component aging, connector oxidation, mechanical stresses and vibration, and/or maintenance operations such as sparing and swapping of cables, front-end electronics modules, and/or associated circuitry.

The present disclosure relates to an antenna structure. The antenna structure includes a plurality of receiver paths that are ranked based on a preset manner to obtain a ranking order of each of the plurality of receiver paths; a plurality of antennas; and a switch disposed between the plurality of antennas and the plurality of receiver paths, wherein the switch is configured to change a connection relationship between the plurality of antennas and the plurality of receiver paths based on a signal strength of the plurality of antennas and the ranking order of the plurality of the receiver paths.

Multi-input, multi-output reconfigurable wireless converters are described herein. The wireless converter includes a plurality of signal converters, a plurality of wireless transceivers, a plurality of antennas, a switch matrix, and a field programmable gate array (FPGA). The wireless converter may further have a plurality of input transceivers. Each signal converter may have an input, an output, a transmit channel, a receive channel, a first switch, and a second switch.

The present disclosure relates to an antenna structure. The antenna structure includes a plurality of receiver paths that are ranked based on a preset manner to obtain a ranking order of each of the plurality of receiver paths; a plurality of antennas; and a switch disposed between the plurality of antennas and the plurality of receiver paths, wherein the switch is configured to change a connection relationship between the plurality of antennas and the plurality of receiver paths based on a signal strength of the plurality of antennas and the ranking order of the plurality of the receiver paths.

This application discloses a tag quantity estimation system and method of RFID. A processor-readable medium was disclosed at the same time. This estimation method applies a spatial diversity gain existing in a multi-antenna system. Separated and sequentially stacked the real parts and the imaginary parts of the multiple signals received by multiple antennas. Then, a tag quantity estimation problem is converted into a data clustering problem in high-dimensional space. In this way, the overlapped cluster data in low-dimensional space can be separated in the high-dimensional space, thereby improving the accuracy of tag quantity estimation.

Aspects of the subject disclosure may include, for example, receiving a first wireless signal at a first carrier frequency, the first wireless signal including a first modulated signal generated by a second antenna system by frequency-shifting the first modulated signal from a first native frequency band to the first carrier frequency, receiving a second wireless signal at a second carrier frequency, the second wireless signal including a second modulated signal generated by a third antenna system by frequency-shifting the second modulated signal from a second native frequency band to the second carrier frequency, detecting a fault in the second antenna system, and responsive to the detecting, adjusting a power level of a first wireless transmission to generate an adjusted first wireless transmission directed to the third antenna system. Other embodiments are disclosed.

Adjustable compensation circuit for switching applications. In some embodiments, a compensation circuit for a switching circuit can include an inductive circuit that couples a selected node of the switching circuit with a reference node. The inductive circuit can be configured to provide a plurality of inductance values.

Switching circuits for wireless applications. In some embodiments, a switching circuit can include a common node and a plurality of series arm switches with each being capable of connecting the common node and a respective signal node. The switching circuit can further include a shunt arm switch for each of the series arm switches. The shunt arm switch can be capable of connecting the signal node of the respective series arm switch to a ground. The switching circuit can further include a compensation circuit coupled to the common node and configured to compensate for a parasitic effect resulting from some or all of the series arm switches and the shunt arm switches.

Aspects of the subject disclosure may include, for example, receiving a first wireless signal at a first carrier frequency, the first wireless signal including a first modulated signal generated by a second antenna system by frequency-shifting the first modulated signal from a first native frequency band to the first carrier frequency, receiving a second wireless signal at a second carrier frequency, the second wireless signal including a second modulated signal generated by a third antenna system by frequency-shifting the second modulated signal from a second native frequency band to the second carrier frequency, detecting a fault in the second antenna system, and responsive to the detecting, adjusting a power level of a first wireless transmission to generate an adjusted first wireless transmission directed to the third antenna system. Other embodiments are disclosed.