Joint Narrowband and Multiple Access Interference Suppression
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Solution Overview
Problem
Existing navigation communication systems face challenges in effectively suppressing both narrowband and multiple access interference, leading to decreased signal-to-noise ratio, increased error rates, and reduced system capacity.
Innovation Solution
A method and device for joint suppression of narrowband and multiple access interference, involving time domain windowing, frequency domain interference processing, parallel acquisition, matched filtering, and iterative updating of filter weights to improve carrier-to-noise ratio and pseudo-code tracking accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If frequency domain narrowband interference suppression and parallel interference cancellation (PIC) cascade processing are used, then narrowband and multiple access interference are suppressed, but additional cancellation errors are introduced and convergence speed decreases
Solution Approach 1:
The patent combines narrowband interference suppression and multiple access interference cancellation into a unified joint processing framework. The matched filter is designed to simultaneously suppress narrowband interference and cancel multiple access interference, eliminating the need for separate cascade processing stages and the associated cancellation errors.
Solution Approach 2:
The patent employs iterative updating of filter weights based on received signal characteristics. The filter adapts dynamically by adjusting its parameters through multiple iterations, improving convergence speed and accuracy while maintaining effective interference suppression without introducing additional errors.
2Object-affected harmful factors
If traditional cascade processing methods are used, then interference suppression is achieved, but filter parameter convergence speed and accuracy are reduced
Solution Approach 1:
The patent implements a feedback mechanism where the filter weights are iteratively updated based on the received signal characteristics and interference cancellation performance. This closed-loop approach accelerates convergence by continuously adjusting parameters based on actual system performance, significantly reducing convergence time compared to traditional open-loop cascade methods.
Solution Approach 2:
The patent performs preliminary matched filtering operations that pre-process the signal to enhance subsequent interference cancellation effectiveness. By preparing the signal in advance with appropriate filtering, the system reduces the number of iterations needed for convergence, thereby decreasing overall processing time.
Data Source
AI summary
A method and a device for joint suppression of narrowband and multiple access interference are provided. The method includes: performing time domain windowing processing on a received signal, and performing frequency domain interference processing on a signal after windowing processing to obtain a matched filter and a time domain signal; obtaining reconstructed baseband received data for a signal of each channel; obtaining reconstructed signals after matched filtering; accumulating the reconstructed signals of multiple channels to obtain a reconstructed accumulated value, obtaining a compensation value according to a difference between the time domain signal and the reconstructed accumulated value, and compensating the reconstructed signals with the compensation value to obtain an actual received signal of the each channel; and outputting a joint suppression result.