Direct Conversion Digital Receiver with Oversampling Signal Selection
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Solution Overview
Problem
Conventional wireless receivers, such as superheterodyne receivers, are limited by the need for high-order passive circuitry and multiple stages of frequency translation, leading to increased cost, size, and power consumption, as well as limited tunability and dynamic range, due to reliance on passive filter technology and analog processing.
Innovation Solution
A digital receiver architecture using a multipath approach with an N stage ring counter, N path switching network, and predictive coders, which eliminates the need for high-order passive circuitry and allows for programmable waveforms for frequency translation and quantization, enabling efficient selection and rejection of signals across a wide frequency range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional superheterodyne receiver architecture is used with multiple downconversion stages and passive filters, then signal selectivity can be achieved, but device complexity, cost, and size increase significantly
Solution Approach 1:
The patent replaces mechanical/passive filter systems with digital signal processing. The digital receiver uses software-based filtering and signal processing algorithms to achieve the same selectivity function that previously required complex passive filter networks and multiple analog downconversion stages, thereby reducing hardware complexity while maintaining or improving selectivity performance.
Solution Approach 2:
The patent changes the operating parameters from fixed analog filter characteristics to programmable digital signal processing parameters. The receiver can dynamically adjust filtering characteristics, bandwidth, and frequency selection through software control, eliminating the need for fixed passive filter components and reducing overall device complexity.
2Measurement precision
If high-order passive circuitry and multiple frequency translation stages are used, then desired signals can be selected, but power consumption increases
Solution Approach 1:
The patent substitutes power-hungry analog frequency translation and filtering circuitry with low-power digital signal processing. The digital receiver performs signal selection and processing in the digital domain, which consumes significantly less power than multiple analog downconversion stages and high-order passive filter networks, while maintaining the capability to select desired signals effectively.
3Adaptability or versatility
If conventional analog receiver architecture is used, then basic signal reception is possible, but tunability across wide frequency ranges is limited
Solution Approach 1:
The patent implements wide frequency tunability by transitioning from fixed analog filter characteristics to programmable digital signal processing parameters. The digital receiver can be reconfigured through software to operate across wide frequency ranges without requiring complex analog circuit changes, enabling flexible adaptation to different frequency bands and communication standards.
Solution Approach 2:
The patent creates a universal receiver architecture that can handle multiple frequency ranges and signal types through a single digital signal processing platform. The same hardware infrastructure supports various communication modes and frequency bands by changing software configurations, eliminating the need for multiple specialized analog receiver circuits.
4Measurement precision
If multiple downconversion stages are used to improve signal processing, then selectivity increases, but the number of circuit components increases
Solution Approach 1:
The patent replaces multiple analog downconversion stages and associated passive filter components with a single digital signal processing system. The digital receiver performs all necessary frequency translation and filtering operations through software algorithms, eliminating the need for multiple physical downconversion stages and reducing the total quantity of circuit components significantly.
Solution Approach 2:
The patent merges the functions of multiple downconversion stages and filter networks into a single integrated digital signal processing platform. By combining these separate functional blocks into one unified digital system, the patent reduces the number of discrete circuit components while maintaining or enhancing the overall signal selectivity capability.
Data Source
AI summary
The invention described herein is directed to different embodiments of a wireless communications device that can be used in many different applications, such as but not limited to a digital oversampling receiver adapted to select desired signals and to reject undesired signals. In one embodiment, a wireless communications device is disclosed that comprises an architecture for a receiver front end that obviates the need for high order passive circuitry or RC active circuitry to select desired signals and to reject undesired signals.