Preamble-Based Digital Code Recovery for RFI Signal Calibration
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Solution Overview
Problem
Existing digital communication systems face challenges in maintaining optimal signal-to-noise ratio (SNR) due to transmission losses affecting signal amplitude, which impact the performance of radio frequency interconnects (RFI) during modulation and demodulation processes.
Innovation Solution
A digital code recovery circuit is employed, which transmits a preamble code to identify and compensate for transmission losses by determining and applying digital calibration adjustments to the data, using a calibration circuit to adjust the signal amplitude and thereby improve SNR.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If digital data is transmitted over RFI without calibration adjustments, then data transmission can occur, but signal amplitude degradation due to transmission losses reduces SNR and impairsthe performance of modulation and demodulation
Solution Approach 1:
The system transmits a preamble code before the actual data to perform calibration adjustments in advance. The calibration circuit determines digital calibration adjustments based on the recovered preamble code and stored preamble data, preparing the system for subsequent data transmission with corrected signal amplitude characteristics.
Solution Approach 2:
The calibration circuit uses feedback from the recovered preamble code compared with stored preamble data to determine the necessary digital calibration adjustments. This feedback mechanism enables the system to identify and compensate for transmission losses that affect signal amplitude.
2Reliability
If no preamble code is transmitted, then transmission time is reduced, but the system cannot identify or compensate for transmission losses affecting signal amplitude
Solution Approach 1:
A preamble code is transmitted before the main data to perform calibration adjustments in advance. This preliminary action enables the calibration circuit to determine digital calibration adjustments based on the recovered preamble code and stored preamble data, ensuring accurate signal amplitude compensation for subsequent data transmission.
Solution Approach 2:
The system uses the transmitted preamble code itself to perform the calibration function. The calibration circuit determines adjustments by comparing the recovered preamble code with the stored preamble data, allowing the signal to self-diagnose and self-correct its transmission characteristics without requiring external calibration equipment.
3Reliability
If digital calibration adjustments are applied to compensate for transmission losses, then SNR is improved, but the device complexity increases due to the calibration circuit and preamble processing
Solution Approach 1:
The calibration circuit performs multiple functions: it recovers the preamble code, compares it with stored data, determines digital calibration adjustments, and applies these adjustments to subsequent data transmission. This multi-functional approach consolidates calibration operations into a single circuit block, reducing overall system complexity despite the added calibration capabilities.
Solution Approach 2:
The system stores a copy of the preamble data and uses this copy for comparison with the recovered preamble code. This copying mechanism enables the calibration circuit to identify transmission losses by comparing the original and received versions, providing a simple yet effective method for determining calibration adjustments without complex analysis.
Data Source
AI summary
A digital code recovery circuit includes a data transmitter that outputs either input data or a preamble code as transmitter data. A radio frequency interconnect (RFI) transmitter modulates carrier signals based on the transmitter data and transmits the modulated carrier signals over a channel to an RFI receiver that demodulates the carrier signals to obtain recovered transmitter data. A calibration storage device stores preamble data and a calibration circuit receives the recovered transmitter data. If the recovered transmitter data originated from the preamble code, the calibration circuit determines a set of digital calibration adjustments from the recovered transmitter data and the preamble data. If the recovered transmitter data originated from the input data, the calibration circuit applies the set of digital calibration adjustments to the recovered transmitter data to obtain adjusted digital code and outputs the adjusted digital code.