Board Bidirectional Coupler Channel Reciprocity Correction
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Solution Overview
Problem
Existing MIMO wireless communications systems face challenges in achieving high accuracy for channel reciprocity correction between transmitters and receivers due to inconsistencies in amplitude, phase, and delay, which affects the efficiency of signal transmission and reception.
Innovation Solution
The implementation of a board with a bidirectional coupler and a combiner-splitter that couples and divides radio frequency signals for both transmitters and receivers, enabling consistent device alignment for channel correction, thereby improving the accuracy of channel reciprocity correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate directional couplers and combiners are used for transmitter and receiver channel correction, then channel correction can be performed, but device alignment consistency between transmitter and receiver correction paths is poor, reducing channel reciprocity correction accuracy
Solution Approach 1:
The patent combines the transmitter channel correction path and receiver channel correction path to use the same bidirectional coupler and combiner-splitter devices. This merging eliminates the need for separate directional couplers and combiners for each path, ensuring consistent device alignment and improving channel reciprocity correction accuracy.
Solution Approach 2:
The bidirectional coupler and combiner-splitter are designed to serve multiple functions: they are used for both transmitter channel correction and receiver channel correction. This multi-functionality ensures that the same devices are aligned consistently across both correction paths, resolving the alignment inconsistency problem.
2Ease of manufacture
If traditional separate correction paths are used for transmitter and receiver, then channel correction is possible, but the complexity of maintaining consistent device alignment increases
Solution Approach 1:
By merging the transmitter and receiver correction paths to share common devices (bidirectional coupler and combiner-splitter), the patent simplifies the overall system structure. This reduces the number of separate components that need to be aligned and manufactured, making the system easier to manufacture while maintaining correction functionality.
Solution Approach 2:
The universal use of bidirectional couplers and combiner-splitters in both correction paths reduces the total component count and simplifies manufacturing. Instead of manufacturing and aligning separate directional couplers and combiners for each path, a single set of universal devices serves both functions.
3Productivity
If multiple separate correction components are used, then channel correction functionality is achieved, but processing efficiency is reduced due to inconsistent device alignment
Solution Approach 1:
The patent merges the correction paths to use shared devices, which eliminates alignment inconsistencies between separate paths. This improves processing efficiency by ensuring that the same consistently-aligned devices are used for both transmitter and receiver channel correction, enabling more accurate and efficient channel reciprocity correction.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution ensures consistency in device alignment for channel correction, enhancing the accuracy of channel reciprocity correction and improving processing efficiency in MIMO systems.
Implementation Method 1
a bidirectional coupler and a combiner-splitter, where the bidirectional coupler is separately connected to the multiple transmitters, the multiple receivers and the combiner-splitter, and configured to couple radio frequency signals output by the multiple transmitters
Implementation Method 2
the combiner-splitter is separately connected to the bidirectional coupler and the correction transceiver, and configured to combine transmitter radio frequency signals coupled by the bidirectional coupler and then transmit the combined transmitter radio frequency signals to the correction transceiver
Data Source
AI summary
A board includes: a baseband unit, multiple transmitters, multiple receivers, a multi-antenna array, a correction transceiver, a correction calculation unit, a bidirectional coupler, and a combiner-splitter. The bidirectional coupler is configured to couple radio frequency signals output by the multiple transmitters and then transmit the coupled radio frequency signals to the combiner-splitter, and to couple receiver correction reference signals obtained by performing division by the combiner-splitter and then send the coupled receiver correction reference signals to the multiple receivers; and the combiner-splitter is configured to combine transmitter radio frequency signals coupled by the bidirectional coupler and then transmit the combined transmitter radio frequency signals to the correction transceiver, and to divide a receiver correction reference signal sent by the correction transceiver and then send receiver correction reference signals obtained by performing division to the coupler. Accuracy of channel reciprocity correction of a transmitter and a receiver can be ensured.