Exploiting Image Interference in Multi-Carrier Wireless Systems
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Solution Overview
Problem
Multi-carrier wireless systems suffer from performance degradation due to radio frequency (RF) front-end imperfections, leading to image interference, which degrades system performance and increases power consumption and cost.
Innovation Solution
A low-complexity method that exploits image interference in single-antenna multi-carrier systems by encoding modulated symbols at the transmitter and combining signals received at image subcarriers at the receiver, achieving diversity order of two without requiring feedback or extra transmit power, allowing the use of high-order constellations in low-cost transceivers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If zero-IF architecture is used to reduce power consumption and cost, then power consumption and cost are reduced, but image frequency band interference occurs that degrades system performance
Solution Approach 1:
The patent applies the principle of converting harm into benefit by treating the harmful image interference as a useful signal source. The method encodes modulated symbols at the transmitter and combines signals received at image subcarriers at the receiver, transforming the previously harmful image interference into a beneficial diversity gain mechanism that improves system performance without requiring additional hardware or power consumption
2Object-affected harmful factors
If image interference compensation methods are applied to remove image components, then image interference is reduced, but system complexity increases due to additional processing requirements
Solution Approach 1:
Instead of attempting to remove or compensate for image interference through complex filtering and signal processing, the patent converts the harmful image interference into a beneficial diversity mechanism. The encoder processes modulated symbols and the combiner combines signals from image subcarriers, achieving diversity gain without requiring complex image rejection processing, thus maintaining low system complexity while eliminating image interference degradation
3Reliability
If diversity gain is achieved through multiple antennas or complex schemes, then communication quality is improved, but device complexity and cost increase
Solution Approach 1:
The patent achieves diversity gain without requiring multiple antennas or complex diversity schemes by exploiting the image interference phenomenon itself. The encoder and combiner work together to process signals in a way that captures diversity from the image subcarriers, providing improved communication quality while maintaining single-antenna simplicity and avoiding the complexity of traditional diversity implementations
Data Source
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AI summary
This invention relates to a method for exploiting the inevitable image interference in multi-carrier wireless systems, comprising a multi-carrier single-antenna transmitter, a multi-carrier single-antenna receiver, wherein the transmitter comprises an encoder and the receiver comprises a combiner capable to process the symbols received in image subcarriers in two consecutive time slots.