RF Transceiver Self-Calibration for Beamforming Phase Alignment
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Solution Overview
Problem
Existing RF devices face challenges in accurately aligning transmitter local oscillator phases due to chip impairments such as unknown delays, LO phase drift, and phase offsets, leading to beam forming errors in ultra-wide band radar applications.
Innovation Solution
A radio frequency device with co-located transmitters and receivers, utilizing a control device to determine and compensate for phase differences and other variations by combining variation information from symmetric measurements, eliminating the need for additional calibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional calibration methods are used to align transmitter local oscillator phases, then beam forming accuracy can be improved, but additional calibration steps and device complexity increase
Solution Approach 1:
The system performs self-calibration by having each transmitter transmit a signal that is received by all receivers, including the co-located one. The control device calculates phase differences using these received signals and automatically compensates for mismatches without requiring external calibration equipment or additional calibration steps, making the system self-sufficient
Solution Approach 2:
The control device uses feedback from the received signals to determine phase differences between transmitters and receivers. By continuously measuring the phase relationships and applying compensation based on these measurements, the system dynamically adjusts for mismatches, improving beam forming accuracy through iterative feedback correction
2Reliability
If multiple calibration steps are performed to compensate for chip impairments, then transmitter and receiver alignment can be improved, but calibration time and processing duration increase
Solution Approach 1:
The patent combines multiple calibration objectives into a single integrated process. By having each transmitter transmit once and having all receivers record the signals, the system simultaneously determines both transmitter phase differences and receiver phase differences in one calibration sequence, eliminating the need for separate calibration steps for each component
Solution Approach 2:
The control device performs preliminary calculations by storing the received signals and systematically computing phase differences for all transmitter-receiver pairs before applying compensation. This preliminary processing organizes the calibration data efficiently, reducing the overall time required for the complete calibration process
Data Source
AI summary
In a radiofrequency (RF) system with multiple transceivers configured to operate together (e.g., in beamforming applications), phase, delay, gain, or other offsets between individual transceivers can be compensated by pairwise measurements of RF signals transmitted by one active transmitter at a time as received by the receiver of the active transceiver and the receiver of another transceiver.