RF Repeater Circuit Digital Signal Processing Noise Factor
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing RF repeater systems fail to improve the noise factor of RF signals, as they only suppress out-of-band noise and do not effectively address in-band noise, leading to suboptimal signal quality in RF signal regeneration.
Innovation Solution
A radio-frequency repeater system that digitizes the full RF signal using a high-performance wideband ADC, performs spectral processing to extract channel symbols, and remodulates them, improving the noise factor by correcting amplitude and phase errors and re-encoding the signal, thereby enhancing the signal-to-noise ratio and bit error rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If analog filtering is used to suppress out-of-band noise, then out-of-band noise is reduced, but in-band noise remains unaddressed and noise factor does not improve
Solution Approach 1:
The patent replaces analog filtering mechanisms with digital signal processing. The received RF signal is converted to digital form using an ADC, then digital filters process the signal to suppress both out-of-band and in-band noise. This substitution enables more sophisticated noise reduction algorithms that can operate in the digital domain, improving the noise factor while maintaining selective filtering capabilities.
Solution Approach 2:
The patent changes the operational parameters of noise suppression by operating in the digital frequency domain rather than analog. By performing Fast Fourier Transform (FFT) on the digitized signal, the system can apply frequency-selective filtering with precise control over filter characteristics. This parameter change enables independent optimization of out-of-band rejection and in-band noise reduction, resolving the contradiction between the two requirements.
2Reliability
If full RF signal spectrum is digitized using wideband ADC, then in-band channel noise can be reduced and error correction enabled, but system complexity increases
Solution Approach 1:
The patent segments the RF signal processing into distinct functional stages: analog front-end conditioning, wideband ADC conversion, digital filtering, FFT-based spectral processing, error correction decoding, and IFFT-based signal reconstruction. Each stage handles a specific aspect of signal processing, allowing optimization of individual components while managing overall system complexity through modular architecture.
Solution Approach 2:
The patent introduces digital signal processing as an intermediary between the analog RF signal and the final regenerated output. The wideband ADC acts as an intermediary converting analog to digital domain, enabling sophisticated noise reduction and error correction algorithms to operate on the signal without directly modifying the analog path. This intermediary approach allows complex processing to be performed in the digital domain where it can be more effectively managed.
Data Source
AI summary
RF repeater circuits may be used to regenerate an RF signal. A method and apparatus is described for regenerating a received RF signal the RF signal comprising a plurality of channels, each channel comprising a plurality of channel symbols, the method comprising producing a digitized RF signal from the received RF signal, extracting spectral information of each of the channels from the digitized RF signal, recovering one or more channel symbols from each of the plurality of channels, remodulating the channel symbols, and converting the remodulated channel symbols to an analog signal resulting in a regenerated RF signal.