Full-Duplex Inter-Cellsite Interference Cancellation via Phase Estimation
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Solution Overview
Problem
Full-duplex communication systems face significant inter-cellsite interference when multiple nodes communicate simultaneously in the same frequency channel, leading to reduced bandwidth and throughput due to unintended signal reception by nearby nodes.
Innovation Solution
A system that calculates channel amplitude and phase estimates to generate a cancellation signal, which is then communicated to affected nodes to cancel or attenuate inter-cellsite interference, allowing desired signals to be correctly received by using processors and various network connections like copper cabling or fiber optics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full-duplex communication is implemented to double bandwidth capacity, then throughput and bandwidth efficiency are improved, but inter-cellsite interference increases and reduces available bandwidth
Solution Approach 1:
The patent converts the harmful inter-cellsite interference into a useful signal by generating a cancellation signal that mirrors the interfering transmission. This cancellation signal is then combined with the received signal at the affected node, effectively neutralizing the interference and allowing full-duplex communication to proceed without degradation.
Solution Approach 2:
The patent introduces an intermediary cancellation signal between the interfering transmission and the affected receiver. This intermediary signal acts as a mediator that cancels out the harmful interference, enabling the desired signal to be received cleanly while maintaining full-duplex operation across multiple nodes.
2Adaptability or versatility
If multiple full-duplex nodes communicate simultaneously in a single channel, then frequency spectrum efficiency is improved, but signal reception accuracy deteriorates due to unintended signal reception
Solution Approach 1:
The patent applies preliminary anti-action by having nodes transmit cancellation signals before or during the reception of desired signals. These pre-coordinated cancellation signals counteract the interfering transmissions in advance, ensuring that when the affected node receives the desired signal, the interference has already been neutralized.
Solution Approach 2:
The patent implements feedback mechanisms where nodes share channel state information and interference characteristics with each other and with a central controller. This feedback enables the system to dynamically adjust cancellation signals and coordination strategies to maintain high signal reception accuracy while utilizing the frequency channel efficiently.
Data Source
AI summary
Disclosed herein are systems, methods, and computer-readable storage devices for reducing inter-cellsite interference during full-duplex communication. A system receives a channel amplitude and a phase estimate between a first station and a second station, the first station and the second station creating inter-cellsite interference on a channel during full-duplex communications. The system calculates a level of the inter-cellsite interference between the first station and the second station based on the channel amplitude and the phase estimate and generates a cancellation signal based on the inter-cellsite interference. The system then communicates the cancellation signal to the first station for transmission with additional data during additional full-duplex communications.