RF Signal Compression Before Amplification to Reduce Intermodulation
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Solution Overview
Problem
Conventional wireless transmission systems face issues with intermodulation effects due to high signal peaks, leading to increased noise floors and reduced coverage areas, as they often require costly and power-intensive amplifiers to handle high power RF signals.
Innovation Solution
The system analyzes incoming signals to detect regions likely to cause intermodulation and applies a compression signal to reduce peak amplitudes, allowing for amplification within linear regions, thereby reducing intermodulation effects and the need for expensive amplifiers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional amplification is used to handle high power RF signals, then sufficient amplification can be achieved, but intermodulation effects occur due to signal peaks causing amplifiers to operate in non-linear regions
Solution Approach 1:
The system performs preliminary analysis of the input signal to identify regions likely to cause intermodulation effects before amplification occurs. A compression signal is then applied in advance to reduce peak amplitudes of identified signal regions, ensuring that subsequent amplification occurs within linear regions of the amplifier, thereby preventing intermodulation effects rather than correcting them after the fact.
Solution Approach 2:
The compression signal acts as an intermediary between the input signal and the amplifier. By introducing this intermediate signal that reduces peak amplitudes, the system enables the amplifier to operate in its linear region without directly exposing it to high peak signals that would cause non-linear operation and intermodulation effects.
2Reliability
If multiple amplifiers in series are used to achieve sufficient amplification while remaining in linear regions, then faithful signal transmission is maintained, but power consumption and equipment cost increase significantly
Solution Approach 1:
By performing preliminary compression of the input signal to reduce peak amplitudes before amplification, the system enables a single amplifier to operate within its linear region and achieve sufficient amplification without requiring multiple amplifiers in series, thereby reducing power consumption while maintaining signal fidelity.
Solution Approach 2:
The system changes the amplitude parameter of the input signal by applying compression to reduce peak-to-average ratios. This parameter modification allows the amplifier to handle the signal within its linear operating region, achieving reliable amplification with reduced power consumption compared to using multiple amplifiers.
3Power
If multiple amplifiers in series are deployed to handle high power RF transmission, then sufficient amplification is achieved, but heat removal issues and equipment costs increase
Solution Approach 1:
The system applies preliminary compression to the input signal to reduce peak amplitudes before amplification, enabling a single amplifier to achieve sufficient transmission power without requiring a cascade of multiple amplifiers, thereby simplifying the device structure and reducing heat removal requirements.
Solution Approach 2:
The system extracts and removes the problematic peak components from the input signal through compression before amplification. By taking out the excessive peak amplitudes that would require multiple amplifiers, the system enables single-amplifier operation with reduced complexity and heat generation.
Data Source
AI summary
Compression of an input signal prior to high power radio frequency (RF) amplification and transmission is disclosed. A compression device can receive an input signal and generate a compressed signal that can be passed to an amplification stage to reduce intermodulation effects. The compression device can further generate compression information that can be transmitted to enable a mobile device receiving an amplified version of the compressed signal and the compression information to decompress the amplified version of the compressed signal. Further, a mobile device that can receive an amplified compressed signal and compression information, such that the mobile device can decompress the amplified compressed signal, is also disclosed. The disclosed subject matter can enable use of lower cost, smaller, and less complex RF amplifiers within a wireless network environment.