Joint Whitening Feedback for Interference Suppression
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Solution Overview
Problem
Modern communication systems face challenges in maintaining data quality and speed due to interference from various sources and computational complexities, particularly in mobile communication, where existing solutions have not effectively addressed these issues.
Innovation Solution
A communication system incorporating a covariance module to calculate joint-covariance, a preparation module to generate a joint-whitener, a joint whitening module to process receiver signals, and a cancellation module to cancel interference, all operating within a space-frequency block-coding scheme, to enhance data transmission by randomizing and suppressing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If interference rejection combining is applied in the frequency domain, then interference suppression is improved, but computational complexity increases
Solution Approach 1:
The receiver signal is divided into multiple subcarrier components that are processed independently through the joint-whitening operation. This segmentation allows the interference suppression to be applied across frequency domains while reducing the overall computational burden by breaking down the complex matrix operations into smaller, manageable subcarrier-level operations.
Solution Approach 2:
The joint-covariance matrix is calculated and the joint-whitener is generated in advance before the actual signal detection process. This preliminary computation of statistical properties enables the subsequent interference rejection to proceed more efficiently, as the complex matrix decompositions are performed once rather than repeatedly during signal processing.
2Object-affected harmful factors
If joint-whitening processing is applied to randomize interference signal, then interference suppression is improved, but processing time increases
Solution Approach 1:
The joint-whitening operation is applied independently to each subcarrier component rather than processing the entire signal block at once. This time-division segmentation of the frequency domain allows parallel processing of multiple subcarriers, significantly reducing the total processing time while maintaining effective interference randomization across the complete signal.
Solution Approach 2:
The processing approach changes parameters by operating in the frequency domain using Fast Fourier Transform (FFT) based methods rather than traditional time-domain processing. This parameter change enables more efficient computation of the joint-whitening operation, reducing processing time while achieving the same interference randomization effect.
3Measurement precision
If feedback cancellation is implemented for accurate detection, then detection accuracy is improved, but system complexity increases
Solution Approach 1:
The message processing module generates feedback based on the joint-whitening output, which is then fed back to the cancellation module. This feedback mechanism allows the system to iteratively refine its detection by canceling out estimated interference components, improving detection accuracy through adaptive refinement rather than requiring complex upfront processing.
Solution Approach 2:
The joint-whitening output serves as an intermediary that bridges the received signal and the final detection result. By introducing this intermediate processing stage that randomizes interference before detection, the system achieves more accurate detection with simpler feedback cancellation, as the intermediary has already prepared the signal in a more favorable form for detection.
Data Source
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AI summary
A communication system includes: a covariance module configured to calculate a joint-covariance based on a receiver signal for communicating a communication content in a transmitter signal with an interference signal using subcarriers based on a space-frequency block-coding scheme; a preparation module, coupled to the covariance module, configured to generate a joint-whitener with a control unit based on the joint-covariance for randomizing the interference signal; a joint whitening module, coupled to the preparation module, configured to generate a joint-whitening output based on the receiver signal and the joint-whitener; a message processing module, coupled to the joint whitening module, configured to determine a joint-estimation feedback based on the joint-whitening output; and a cancellation module, coupled to the message processing module, configured to cancel the joint-estimation feedback from the receiver signal for communicating the communication content with a device.