Fourier Transform Matrix Sector Isolation Calibration
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Solution Overview
Problem
Existing wireless communication systems employing Fourier transform matrices face challenges in maintaining optimal sector-to-sector isolation (SSI) due to imbalances in gain and phase between transmit paths, leading to degraded signal quality and data transmission rates.
Innovation Solution
A method and system that calibrate and adjust the gains and phases of transmit paths between Fourier transform matrices by using a known test signal, phase shifter, and attenuator to minimize output and achieve balanced sector-to-sector isolation, involving setting one matrix to pass-through mode, adjusting gains and phases to achieve null angles, and using a correlator to determine necessary adjustments for improved isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If Fourier transform matrices are used to distribute power amongst amplifiers, then power distribution efficiency is improved, but sector-to-sector isolation degrades due to gain and phase imbalances between transmit paths
Solution Approach 1:
The patent adjusts gain and phase parameters of individual transmit paths to compensate for imbalances. By dynamically changing these parameters, the system maintains optimal sector-to-sector isolation while preserving the power distribution efficiency of the Fourier transform matrix architecture.
Solution Approach 2:
The system employs feedback mechanisms to monitor and adjust transmit path characteristics. This allows continuous optimization of gain and phase settings to maintain high sector-to-sector isolation performance while utilizing the Fourier transform matrix for efficient power distribution.
2Device complexity
If gain and phase imbalances exist between transmit paths, then system complexity is reduced, but signal quality and data transmission rates degrade
Solution Approach 1:
The patent performs preliminary calibration of gain and phase settings during system initialization or maintenance periods. This preliminary adjustment ensures optimal signal quality during normal operation without requiring continuous complex adjustments, thus balancing simplicity and performance.
3Device complexity
If gain and phase imbalances exist between transmit paths, then device complexity is reduced, but data transmission rates decrease
Solution Approach 1:
The system performs preliminary calibration of transmit paths to optimize data transmission rates before normal operation begins. This upfront adjustment ensures high productivity without requiring continuously complex adjustment mechanisms during data transmission.
Data Source
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AI summary
A method for providing increased sector-to-sector isolation when transmitting data between a plurality of Fourier transform matrices (105,110), each having an input Fourier transform matrix (FTM), an output FTM, and a plurality of transmit paths therebetween is disclosed. The method includes applying a tone to one of the plurality of transmit paths (410) so that a correlated output can be produced, measuring an output of the output FTM, correlating the output of the output FTM against the tone applied to produce a correlated output (320), adjusting a phase of the transmit path such that a direct current value of the correlated output is minimized, and adjusting an attenuation of the transmit path such that the direct current of the correlated output is minimized.