MIMO Signal Processor Switching for IQ and Antenna Calibration
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Solution Overview
Problem
Existing wireless communication devices with MIMO systems face difficulties in simultaneously satisfying constraints during IQ and antenna calibration due to fixed combinations of analog transmission processing units, DA converters, analog reception processing units, and AD converters.
Innovation Solution
A signal processor with switchable DA and AD converters, along with analog transmission and reception processing units, allows for dynamic reconfiguration of these components to satisfy calibration constraints, enabling proper IQ and antenna calibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the combination of analog transmission processing unit and DA converter and the combination of analog reception processing unit and AD converter are fixed, then the device structure is simplified, but it becomes impossible to satisfy all calibration constraints simultaneously
Solution Approach 1:
The patent introduces switching units that enable dynamic reconfiguration of the connections between DA converters and analog transmission processing units, and between AD converters and analog reception processing units. This dynamic switching capability allows the system to adapt its configuration based on calibration requirements, resolving the contradiction between fixed structure and calibration flexibility.
2Adaptability or versatility
If switching units are added to enable dynamic reconfiguration, then calibration constraint satisfaction is improved, but device complexity increases
Solution Approach 1:
The patent segments the signal processing path by introducing separate switching units for DA converter connections and AD converter connections. This segmentation allows independent control of transmission and reception calibration paths, enabling calibration constraint satisfaction while keeping the added complexity localized and manageable.
3Measurement precision
If the analog transmission processing unit and analog reception processing unit are connected to the same antenna during IQ calibration, then calibration accuracy is improved, but the combination flexibility is reduced
Solution Approach 1:
The switching units act as intermediaries between the analog processing units and antennas, enabling the system to selectively connect transmission and reception units to the same antenna during IQ calibration for improved accuracy, while maintaining combination flexibility for other operating conditions. The switches mediate the connections based on the specific calibration or operational requirements.
Data Source
AI summary
There is provided a signal processor with a plurality of antennas connected for transmitting and receiving wireless signals, including a plurality of analog reception processing units, AD converters, DA converters, and analog transmission processing units, wherein each of the analog reception processing units converts the wireless signal received through the antenna into an analog baseband signal and outputs the signal to the AD converter, each of the DA converters converts the digital baseband signal into analog format and outputs the signal, and each of the analog transmission processing units shifts the frequency band of the analog baseband signal output from the DA converter to the high frequency side. The signal processor further includes a transmission switch which switches among the DA converters respectively connected to the analog transmission processing units and a reception switch which switches among the AD converters respectively connected to the analog reception processing units.