Interference Cancellation in Heterogeneous Wireless Systems
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Solution Overview
Problem
Current wireless communication technologies face interference issues when using heterogeneous communication systems, leading to decreased system throughput and frequency bandwidth waste, as signals from different technologies overlap and affect each other.
Innovation Solution
A system and method employing a receiver, transmitter, and channel estimating and equalizing device to identify and subtract ineffective signals, using a second channel adjusted based on the first channel's characteristics to isolate effective signals, thereby reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If bandwidths for signal transmission and signal reception are separated more to reduce interference, then interference between heterogeneous wireless communication technologies is reduced, but system throughput decreases and frequency bandwidth is wasted
Solution Approach 1:
The patent extracts the interference signal from the received signal by generating a replica of the interference through the second transmitter and channel model, then removes it from the composite signal to recover the effective signal
Solution Approach 2:
The patent introduces a channel model as an intermediary element that simulates the interference channel characteristics, allowing the interference signal to be generated and canceled without physically separating the bandwidths
2Object-affected harmful factors
If signals are transmitted and received at different timings to reduce interference, then interference between heterogeneous wireless communication technologies is reduced, but system throughput decreases and frequency bandwidth is wasted
Solution Approach 1:
The patent creates a copy of the interference signal by passing the second baseband signal through the channel model, then uses this copy to cancel the interference in the received signal, allowing simultaneous transmission and reception
3Object-affected harmful factors
If channel estimating and equalizing device generates and adjusts second channel according to first channel to calculate delay time and subtract third baseband signal, then interference cancellation effectiveness is improved, but device complexity increases
Solution Approach 1:
The patent performs preliminary channel estimation and equalization to establish the channel model before interference cancellation, preparing the necessary parameters in advance to simplify the real-time cancellation process
Solution Approach 2:
The patent uses feedback from the channel estimation process to continuously adjust the channel model parameters, improving interference cancellation effectiveness while managing complexity through adaptive tuning
Data Source
AI summary
The invention relates to a system for interference cancellation and method thereof. The system includes a receiver, a transmitter, and a channel estimating and equalizing device. The transmitter and the receiver use different wireless communication technologies to transmit and receive data. The channel estimating and equalizing device can estimate the channel between the transmitter and the receiver for interference cancellation. The embodiments of the invention provide a system and a method thereof for reducing interferences generated when using one wireless communication technology to transmit signals but using another wireless communication technology to receive signals by using digital baseband signals.