Iterative Interference Cancellation for More Addressable Interferers
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Solution Overview
Problem
Wireless communication receivers face limitations in interference mitigation due to the unavailability of control information from interfering cells, especially for devices near the edge of a cell or those receiving weak control channel signals, which restricts the application of efficient interference mitigation techniques.
Innovation Solution
An iterative receiver process is implemented where improved a priori information from previous iterations is used to detect additional control messages, expanding the set of addressable interferers and enhancing interference mitigation by re-attempting control message detection and adjusting interference mitigation techniques based on derived signal characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If interference mitigation techniques are applied using initial control message decoding, then interference suppression is improved, but the set of addressable interferers is limited due to decoding failures at cell edges
Solution Approach 1:
The patent applies preliminary action by performing initial control message decoding before interference mitigation, but recognizes this limitation prevents addressing interferers at cell edges. The iterative approach then performs additional decoding attempts using updated signal estimates, effectively performing the action of expanding the addressable interferer set after the preliminary step has been completed.
Solution Approach 2:
The patent implements feedback by using the results of initial interference mitigation to improve subsequent control message decoding attempts. The signal estimates from the first iteration are fed back into the decoding process, allowing the receiver to successfully decode control messages from additional interferers that were initially undecodable, thereby expanding the set of addressable interferers.
2Adaptability or versatility
If iterative receiver process is used to detect additional control messages, then the set of addressable interferers is expanded, but receiver complexity increases
Solution Approach 1:
The patent applies dynamics by implementing an iterative receiver process that dynamically adjusts the set of addressable interferers based on decoding success. Rather than using a fixed set determined by initial decoding, the system iteratively refines the signal estimates and attempts to decode additional control messages, allowing the receiver configuration to adapt and expand as the process progresses.
Solution Approach 2:
The patent implements continuity of useful action by maintaining the iterative receiver process that continuously attempts to decode control messages from additional interferers. Instead of performing a single decoding attempt and stopping, the system continues to refine estimates and attempt decoding across multiple iterations, keeping the useful action of interference mitigation continuous and improving throughout the process.
Data Source
AI summary
Techniques for expanding the set of addressable interfering signals in an interference cancelling receiver are described, where the task of control message detection from interfering cells is integrated in an iterative receiver process where increasingly better a priori information on the received data signals from the previous iteration is used to detect additional control messages and successively grow the set of interfering signals included in the receiver's interference mitigation processing. In an example method, first estimated symbols for a desired signal are generated. A control channel corresponding to a first interfering signal is detected, where said detecting is based on the first estimated symbols. Signal characteristics information for the first interfering signal is then derived from the detected control channel signal, and used to generate second estimated symbols for the desired signal, using an interference-mitigation technique to mitigate the effects of the interfering signal.


