Transmitter Precoding for Full-Duplex Self-Interference Reduction
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Solution Overview
Problem
Current wireless communication systems face challenges in reducing self-interference and distortion in full-duplex communications, leading to performance degradation due to linear and non-linear interference, especially in scenarios where sub-band full-duplex communications result in LNA saturation and frequency domain spreading.
Innovation Solution
A transmitter device obtains channel matrices for its transmission and reception antennas and a receiver device's reception antenna, generating a combined channel matrix to reduce interference by multiplying it with a precoding matrix, and for non-linear interference, uses a distortion transition matrix and symbol-domain transform to mitigate undesired distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full-duplex communications are implemented, then spectral efficiency and productivity are improved, but self-interference and distortion increase causing performance degradation
Solution Approach 1:
The system performs preliminary channel estimation and precoding matrix calculation before actual full-duplex communication. By obtaining channel matrices and computing precoding matrices in advance, the system prepares interference mitigation strategies proactively, reducing the impact of self-interference during communication operations.
Solution Approach 2:
A precoding matrix acts as an intermediary between the transmitted signal and the channel. This matrix transforms the original signal to pre-compensate for channel effects and self-interference, enabling the receiver to separate desired signals from interference more effectively.
2Productivity
If sub-band full-duplex communications are used, then productivity is improved, but LNA saturation and frequency domain spreading occur causing distortion
Solution Approach 1:
The system applies different processing to different frequency sub-bands. By dividing the frequency spectrum into sub-bands and applying specific precoding and interference mitigation techniques to each, the system maintains signal fidelity in critical bands while maximizing throughput in others, preventing LNA saturation effects.
Solution Approach 2:
The communication signal is segmented into multiple frequency sub-bands for independent processing. This segmentation allows the system to manage interference and distortion on a per-sub-band basis, applying appropriate mitigation techniques to maintain overall signal quality while achieving high throughput.
3Object-affected harmful factors
If channel matrices are obtained and precoding is applied, then self-interference is reduced, but device complexity increases
Solution Approach 1:
The transmitting device performs self-interference mitigation by using its own channel state information to compute precoding matrices. The system serves itself by leveraging available channel knowledge to pre-compensate for interference, reducing the need for complex external interference cancellation mechanisms.
Solution Approach 2:
The system changes the parameter representation of the channel from raw channel matrices to derived precoding matrices. This transformation simplifies the interference mitigation process by working with pre-processed parameters that directly enable interference cancellation without requiring complex real-time calculations.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a transmitter device may obtain a first channel matrix associated with communications between a transmitter device transmission antenna and a transmitter device reception antenna and a second channel matrix associated with communications between the transmitter device transmission antenna and a receiver device reception antenna associated with a receiver device. The transmitter device may generate a combined channel matrix based at least in part on the first channel matrix and the second channel matrix. The transmitter device may reduce interference between the transmitter device transmission antenna and the transmitter device reception antenna based at least in part on multiplying the combined channel matrix by a precoding matrix. Numerous other aspects are described.