Dual Band Receiver Using Sample Delay Signal Extraction
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Solution Overview
Problem
Conventional band pass sampling receivers face challenges in simultaneously receiving two RF signals at any frequency band due to interference issues, limiting their ability to support dual or multi-band operations without requiring multiple receiver circuits or complex designs.
Innovation Solution
A dual band receiver is designed with an analog-to-digital converter that converts dual band analog RF signals into dual baseband digital signals, using relative sample delay differences between path signals to extract and filter both baseband signals, allowing for simultaneous reception of multiple frequency bands using a single receiver circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a general band pass sampling receiver uses a single ADC to receive two RF signals at any frequency band, then the receiver structure is simplified and cost is reduced, but interference between the two signals cannot be avoided at the baseband
Solution Approach 1:
The patent divides the baseband signal into multiple paths with different sampling delays. The first path applies a sample delay of D samples followed by downsampling, while the second path applies downsampling without delay. This segmentation allows the system to separate signals that would otherwise interfere at the baseband, resolving the contradiction between simplified structure and signal interference.
Solution Approach 2:
The patent introduces a time-domain dimension by applying different sampling delays to different signal paths. This temporal separation creates a dimensional difference that allows signals to be distinguished after downsampling, enabling simultaneous reception of multiple frequency band signals without interference while maintaining a simple single-ADC architecture.
2Reliability
If the sampling rate is adjusted to avoid interference between two signals, then signal reception quality improves, but it becomes very difficult to determine an appropriate sampling rate
Solution Approach 1:
The patent applies sample delay in the first path before downsampling, which preliminarily separates the spectral components of the two signals. This preliminary action eliminates the need to carefully adjust the sampling rate to avoid interference, as the delay-based separation works regardless of the specific sampling rate choice.
Solution Approach 2:
The patent changes the sampling delay parameter in the first path to create a relative time difference between the two signal paths. This parameter change enables signal separation without requiring precise control of the sampling rate, thereby eliminating the difficulty of determining an appropriate sampling rate while maintaining reliable signal reception.
3Adaptability or versatility
If a dual band receiver uses a receiver circuit for every mode and frequency band, then signal reception capability is improved, but the receiver becomes complicated and expensive
Solution Approach 1:
The patent designs a universal receiver circuit that can receive signals from multiple frequency bands and modes using a single ADC and signal processing path. By applying different sample delays and downsampling ratios, the same circuit structure adapts to different frequency bands, eliminating the need for separate receiver circuits for each mode and frequency band, thus reducing complexity and cost while maintaining enhanced adaptability.
Data Source
AI summary
Disclosed is a dual band receiver which includes an analog-to-digital converter configured to convert a dual band analog RF signal into a dual baseband digital signal; and a first signal extractor configured to generate a first path signal and a second path signal from the dual baseband signal and to extract a first baseband signal using a relative sample delay difference between the first and second path signals, wherein the dual baseband signal includes the first baseband signal and a second baseband signal, the first path signal is a signal obtained by sample delay of the dual baseband signal and then down sampling of a resultant signal, and the second path signal is a signal obtained by down sampling of the dual baseband signal without sample delay.