Amplitude Modulated Signal Receiver Interference Suppression
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Solution Overview
Problem
Existing electronic receivers for amplitude-modulated signals face performance degradation due to interference from adjacent carriers, particularly in scenarios like aeronautical communications where multiple control stations use overlapping communication channels, leading to beats that affect demodulation quality.
Innovation Solution
The electronic receiver employs a tunable local oscillator, analog filter, and digital processing stages that include sinusoidal estimation and interference suppression to identify and eliminate carrier contributions, allowing demodulation of signals with carriers operating at the same nominal frequency without requiring frequent tuning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple control stations use overlapping communication channels with the same nominal frequency, then communication coverage is extended, but interference and beats affect demodulation quality
Solution Approach 1:
The receiver dynamically adapts its processing parameters based on the detected signal environment. The digital processing system adjusts filtering and demodulation parameters in real-time to accommodate signals from multiple control stations operating at the same nominal frequency, enabling reliable communication across overlapping coverage areas without manual retuning.
Solution Approach 2:
The system changes processing parameters such as intermediate frequency selection, filter bandwidth, and demodulation algorithms based on the detected carrier characteristics. By dynamically adjusting these parameters, the receiver can distinguish between signals from different control stations even when they share the same nominal frequency, thereby maintaining demodulation quality across extended coverage areas.
2Manufacturing precision
If traditional receivers are sized for an expected frequency and band, then they are optimized for specific applications, but they require frequent tuning when moving between coverage areas
Solution Approach 1:
The receiver performs self-tuning and self-configuration by automatically detecting the characteristics of incoming signals from control stations. The digital processing system identifies the nominal frequency and band parameters autonomously, eliminating the need for manual intervention or frequent tuning operations when transitioning between coverage areas, thus reducing time loss while maintaining application-specific optimization.
3Productivity
If adjacent carriers are used to increase transmission capacity, then more communication channels are available, but beats between carriers degrade signal quality
Solution Approach 1:
The receiver employs feedback mechanisms where the digital processing system continuously monitors the quality of received signals and adjusts processing parameters accordingly. When beats or interference from adjacent carriers are detected, the system dynamically modifies filtering and demodulation parameters to compensate for the interference, thereby maintaining signal quality while allowing high-density carrier allocation for increased transmission capacity.
Data Source
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AI summary
An electronic receiver for amplitude-modulated signals, including: a sampler (22, 26, 28, 38), which receives an input signal (sin(t)) including one or more amplitude-modulated elementary signals (s1 (t) , s2 (t)) starting from one and the same modulating signal (u(t)) and generates a plurality of input samples (SIF2 (n)) ; a filter (44, 46), which filters the input samples (SIF2(n)) and generates a plurality of samples to be estimated (SIF3, c(n)); an estimation unit (48), which determines a number (P) of sinusoidal functions and corresponding sets of parameters on the basis of the samples to be estimated. The receiver further includes: an eliminating unit (52), which generates a plurality of processed samples (SIF2, NC (n)) on the basis of the input samples and of the sets of parameters; a translating unit (54), which generates a plurality of baseband samples (S'BB(n)) on the basis of the processed samples and of at least one from among the sets of parameters; and an interference-suppression unit (64), which generates a plurality of equalized samples (SBB(n)) on the basis of the baseband samples and of the sets of parameters.