DBPSK Demodulation Using 1-Bit A/D Conversion
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Solution Overview
Problem
Current DBPSK demodulation techniques require complex and power-consuming A/D converters, especially at high data rates, making them unsuitable for low-cost or battery-powered systems due to the need for high resolution in phase difference determination.
Innovation Solution
A method involving separate 1-bit A/D conversion and demodulation processing for in-phase and quadrature-phase components, allowing for maximum likelihood decoding and checksum calculations using softbit values, which reduces circuit complexity and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high resolution A/D conversion is used for phase difference determination, then measurement precision is improved, but device complexity and power consumption increase
Solution Approach 1:
The patent segments the A/D conversion process into two separate 1-bit conversions for in-phase and quadrature components, rather than using a single high-resolution converter. This segmentation maintains measurement precision through subsequent processing while dramatically reducing the complexity of individual conversion stages.
Solution Approach 2:
The patent introduces an intermediary processing stage that combines the outputs of two 1-bit A/D converters and performs phase difference determination through software or logic circuitry. This intermediary layer enables high precision measurement without requiring high-resolution hardware converters.
2Measurement precision
If high resolution A/D converter is used for DBPSK demodulation, then measurement precision is improved, but power consumption increases
Solution Approach 1:
By segmenting the conversion into two 1-bit operations rather than one high-resolution operation, the patent reduces the power consumption of each conversion stage while maintaining overall measurement precision through the combination and processing of both 1-bit results.
Solution Approach 2:
The patent uses inexpensive 1-bit A/D converters instead of expensive high-resolution converters. Although 1-bit converters have limited individual capability, their combined use with proper processing achieves the required precision at much lower cost and power consumption.
3Device complexity
If 1-bit A/D conversion is used, then device complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The patent merges the outputs of two separate 1-bit A/D converters (in-phase and quadrature components) through a combination process that reconstructs the phase information. This merging of multiple low-precision signals achieves high-precision phase difference determination that neither converter could achieve alone.
Solution Approach 2:
The patent transitions from a single-dimensional high-resolution measurement approach to a two-dimensional approach using in-phase and quadrature components. By measuring in two orthogonal dimensions with 1-bit resolution each, the system achieves equivalent or superior phase measurement precision to direct high-resolution measurement.
4Use of energy by stationary object
If 1-bit A/D conversion is used, then power consumption is reduced, but measurement precision deteriorates
Solution Approach 1:
The patent combines the information from two 1-bit converted signals (in-phase and quadrature) to reconstruct phase difference information with sufficient precision. This merging process enables the system to achieve accurate phase measurement while consuming minimal power compared to using a single high-resolution converter.
Data Source
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AI summary
The present invention relates to a method, apparatus, and computer program product for demodulating a differential binary phase shift keying (DBPSK) signal, wherein an in-phase component and a quadrature-phase component are generated from the DBPSK signal, and the in-phase component and quadrature-phase component are separately processed by applying 1-bit analog-to-digital conversion and subsequent differential decoding. Then, a decision on the value of the DBPSK signal is based on a combined consideration of at least one of a maximum likelihood decoding and checksum calculation of the processed in-phase and quadrature-phase components.