Pulse Receiving Circuit Interference Reduction via Phase-Diverse Envelope Detection
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Solution Overview
Problem
Ultra-wide band (UWB) pulse communication systems face challenges in reducing the effect of interference signals without increasing circuit scale and power consumption, as existing methods require high-accuracy clock sources and complex circuits for interference removal.
Innovation Solution
A pulse receiving circuit that generates two pulse signals with different phases, which are then multiplied and filtered to extract low-frequency components for envelope detection, reducing the impact of interference signals without the need for high-accuracy clock sources and simplifying the circuit design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If band pass filter is used to remove interference signals in envelope detection, then interference signals are removed, but cost and size increase
Solution Approach 1:
The invention extracts only the necessary low-frequency components containing envelope information from the modulated signal, discarding high-frequency components that carry interference. By using a low-pass filter instead of a band-pass filter, the system extracts only the useful envelope signal while automatically rejecting out-of-band interference, thereby removing interference without requiring complex filtering structures.
Solution Approach 2:
Instead of using envelope detection with band-pass filtering to remove interference, the invention inverts the approach by using low-pass filtering to extract envelope information directly. This inversion allows the system to obtain envelope detection results while naturally suppressing interference signals that exist in the high-frequency domain, achieving interference removal without complex circuitry.
2Object-affected harmful factors
If diffusion codes are used to reduce interference signal effect, then interference signals are suppressed, but power consumption increases due to generating pulses at higher rate
Solution Approach 1:
The invention creates a simplified copy of the transmitted signal structure by generating local pulse signals that match the expected pulse positions and widths. These local pulse copies are used for correlation detection, allowing the receiver to identify valid pulses while ignoring interference. This copying approach enables interference suppression without requiring high-rate pulse generation or complex diffusion coding sequences, thereby reducing power consumption.
3Object-affected harmful factors
If synchronous detection with correlation calculation is used to remove interference waves, then interference waves are removed, but high-accuracy clock source and complicated pulse position synchronous circuit are required increasing power consumption
Solution Approach 1:
The invention performs partial correlation detection by comparing the received signal with locally generated pulse signals at expected pulse positions. Instead of requiring complete and highly accurate synchronization, the system performs correlation at predetermined pulse positions and accepts detections that exceed a threshold. This partial action approach removes interference effectively while avoiding the need for complex high-accuracy clock sources and sophisticated synchronization circuits, thereby reducing power consumption and circuit complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables efficient wave detection with reduced interference effects while minimizing circuit scale and power consumption, achieving robust communication without the need for high-accuracy clock sources.
Implementation Method 1
a first multiplying circuit which multiplies the receiving signal by the first pulse signal and outputs a first multiplication signal; a second multiplying circuit which multiplies the receiving signal by the second pulse signal and outputs a second multiplication signal
Implementation Method 2
a first low band pass filtering circuit which extracts low frequency component from frequency components of the first multiplication signal and outputs a first low frequency signal; a second low band pass filtering circuit which extracts low frequency component from frequency components of the second multiplication signal and outputs a second low frequency signal
Implementation Method 3
an envelope detection circuit which performs envelope calculation by using the first low frequency signal and the second low frequency signal and outputs a detection signal
Data Source
AI summary
A pulse receiving circuit which receives a receiving signal from the outside includes: a template pulse generating circuit which generates a first pulse signal and a second pulse signal having phase different from that of the first pulse signal based on a pulse position timing signal; a first multiplying circuit which multiplies the receiving signal by the first pulse signal and outputs a first multiplication signal; a second multiplying circuit which multiplies the receiving signal by the second pulse signal and outputs a second multiplication signal; a first low band pass filtering circuit which extracts low frequency component from frequency components of the first multiplication signal and outputs a first low frequency signal; a second low band pass filtering circuit which extracts low frequency component from frequency components of the second multiplication signal and outputs a second low frequency signal; and an envelope detection circuit which performs envelope calculation by using the first low frequency signal and the second low frequency signal and outputs a detection signal.