Broadband Signal Detection Using Multi-Receiver Segmentation
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Solution Overview
Problem
Current receivers face difficulties in detecting the complete broadband frequency spectrum of high-frequency information signals, as their bandwidth and complexity limit the detection of information about the entire frequency spectrum, especially for signals with bandwidths in the range of several hundred MHz or GHz.
Innovation Solution
A device comprising multiple narrow-band receivers detuned from each other to capture different parts of the broadband signal, with each receiver down-converting the signal using distinct frequencies, and combining the transformed signals using Fast Fourier Transform (FFT) to replicate the original signal spectrum, allowing for efficient detection of the entire broadband frequency spectrum.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a single receiver is designed to capture the entire broadband frequency spectrum, then the bandwidth coverage is improved, but the device complexity and computational requirements increase significantly
Solution Approach 1:
The broadband frequency spectrum is divided into multiple narrowband segments, each captured by a separate receiver tuned to a specific frequency range. This segmentation allows the system to achieve wide bandwidth coverage while keeping each individual receiver simple and manageable, avoiding the complexity of a single ultra-broadband receiver.
Solution Approach 2:
Multiple narrowband receiver outputs are combined through frequency shifting and spectral addition to reconstruct the complete broadband spectrum. The individual spectral components from each receiver are shifted to their correct frequency positions and summed together, merging the narrowband signals into a comprehensive broadband representation.
2Device complexity
If multiple narrowband receivers are used to capture different parts of the spectrum, then the device complexity is reduced, but the ability to reconstruct the complete frequency spectrum becomes more difficult
Solution Approach 1:
Frequency shifting operations serve as intermediary steps between the narrowband receiver outputs and the final spectrum reconstruction. Each receiver's output is shifted by a specific frequency offset corresponding to its tuned frequency, acting as an intermediary transformation that enables seamless assembly of the complete spectrum without complex direct reconstruction algorithms.
3Adaptability or versatility
If the downmix frequency offset does not correspond to an integer multiple of FFT bin spacing, then frequency alignment flexibility is improved, but spectral leakage and measurement precision deteriorate
Solution Approach 1:
The downmix frequency offsets are specifically chosen to be integer multiples of the FFT bin spacing, transforming the frequency domain parameters of the receivers. This parameter selection ensures that each receiver's spectrum aligns perfectly with the FFT frequency bins, eliminating spectral leakage and maximizing measurement precision while maintaining the ability to cover the entire broadband spectrum through coordinated frequency shifts.
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 method enables the detection of large bandwidths with high quality and scalability, overcoming limitations of conventional receivers by effectively combining individual spectra to reproduce the original broadband information signal spectrum, while minimizing interference and frequency response errors.
Implementation Method 1
each of the plurality of receivers has a mixer for downmixing the information signal with a respective downmix signal
Implementation Method 2
transforming the individual signals into the frequency domain, which is configured to transform signal sections of the individual signals from a time domain into a frequency domain by means of a Fast Fourier transform
Data Source
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AI summary
An apparatus (10) for receiving an information signal (SHF(t)) with an information signal spectrum (SHF(f)), with a plurality of receivers (12-n) for producing a respective single signal (sn[k] ) from the information signal, wherein each of the plurality of receivers has a mixer (31-n) for down-converting the information signal with a respective down-conversion signal (32-n), and the down-conversion frequencies (fLO,n) differ from one another, so that spectra of the single signals (Sn(f) ) respectively correspond to a different portion of the information signal spectrum, and with a device (14) for combining the single signals (sn[k]) into a combined signal, so that the spectrum (Sges(f)) of the combined signal simulates the information signal spectrum (SHF(f)).