Time-Domain Interference Cancellation Around ADC Range Limits
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Solution Overview
Problem
Wireless communication systems face interference issues from self-interference and remote interference, which degrade service quality, especially in high-traffic areas, and existing methods are inadequate in effectively addressing these interferences.
Innovation Solution
The implementation of a method and apparatus that selectively applies analog and digital time domain cancellation in communication systems, using channel gain estimation to determine the need for either digital or combined analog and digital time domain cancellation, based on the dynamic range of the analog-to-digital converter, to effectively remove interference from both data and cyclic prefix parts in OFDM symbols.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If analog time domain cancellation is applied, then interference cancellation effectiveness is improved, but device complexity increases
Solution Approach 1:
The patent changes the domain parameter from frequency domain to time domain for cancellation operations. By performing cancellation in the time domain where interference signals are more distinguishable from desired signals, the system achieves better cancellation effectiveness while managing complexity through selective application based on signal conditions
Solution Approach 2:
The system dynamically selects between different cancellation approaches (analog vs. digital, time domain vs. frequency domain) based on real-time signal conditions and interference characteristics. This dynamic adaptation allows the system to achieve high cancellation effectiveness only when necessary, thereby managing overall device complexity
2Reliability
If digital time domain cancellation is used, then interference removal is improved, but processing requirements increase
Solution Approach 1:
The patent applies digital time domain cancellation selectively rather than universally. By determining when digital processing is necessary based on interference characteristics and signal conditions, the system achieves effective interference removal only when needed, thereby reducing overall processing power consumption while maintaining reliability
3Reliability
If combined analog and digital cancellation is applied, then cancellation performance is improved, but system complexity increases
Solution Approach 1:
The patent segments the cancellation function into separate analog and digital components that can be independently evaluated and applied. By dividing the cancellation task into distinct stages (analog preprocessing and digital processing), the system achieves high cancellation performance through coordinated operation of simpler, modular components rather than requiring a monolithic complex system
Data Source
AI summary
A system that incorporates the subject disclosure may include, for example, determining an interference based on a channel gain for each signal of a group of signals received at a receiver from a group of transmitters. A determination is made as to whether the interference satisfies a threshold range of an analog-to-digital converter of the receiver for each of the group of transmitters. An analog time domain cancellation is performed responsive to a determination that the interference does not satisfy the threshold range, and a digital time domain cancellation is performed responsive to a determination that the interference satisfies the threshold range. Other embodiments are disclosed.