Beamforming MRC Pre-processing for Adjacency Removal in HDR Radio
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Solution Overview
Problem
High definition radio (HDR) systems face challenges in adjacency removal due to signal degradation and low signal-to-noise ratio (SNR) issues, particularly when crossing borders or regions, leading to difficulties in restoring digital signals affected by adjacent channels.
Innovation Solution
A beamforming maximum ratio combining (MRC) pre-processing system that applies a filter to the sideband of a selected channel in the digital radio reception process, utilizing an automatic gain control (AGC) gain difference to form RF beamforming, and includes a noise removal module using Fast Fourier Transform (FFT) and Inverse FFT (IFFT) for noise detection and removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a filter is applied to the sideband of a selected channel to perform beamforming, then signal restoration capability is improved, but device complexity increases
Solution Approach 1:
The patent applies a filter to the sideband of a selected channel before beamforming processing to pre-separate adjacent channel signals. This preliminary filtering action enables the subsequent beamforming to focus on the desired signal, improving restoration capability while managing complexity through staged processing
Solution Approach 2:
The patent segments the signal processing into distinct stages: filtering the sideband to isolate adjacent channel interference, then applying beamforming to the filtered signal. This segmentation allows each processing stage to be optimized independently, improving overall signal restoration while keeping individual module complexity manageable
2Reliability
If beamforming is performed using AGC gain difference, then MRC gain is maximized, but processing requirements increase
Solution Approach 1:
The patent utilizes the AGC gain difference that naturally occurs during automatic gain control operation to perform beamforming. By leveraging this existing signal characteristic rather than requiring additional dedicated processing resources, the system maximizes MRC gain while minimizing additional processing requirements
Solution Approach 2:
The patent changes the processing approach by using gain value differences from AGC operation as the basis for beamforming. This parameter-based approach allows the system to achieve maximum MRC gain by exploiting existing signal variations rather than requiring complex additional processing mechanisms
3Reliability
If noise removal using FFT and IFFT is implemented, then SNR is improved, but processing time increases
Solution Approach 1:
The patent performs noise removal using FFT and IFFT as a preliminary processing step before final signal restoration. By removing noise early in the processing chain, the subsequent processing stages work with cleaner signals, improving final SNR while allowing for optimized processing time allocation across different stages
Data Source
AI summary
A beamforming maximum ratio combining (MRC) pre-processing system for adjacency removal of HDR includes a first filter module implemented in a digital radio receiver and allowing only a low side band signal having a frequency lower than a center frequency of a radio signal in a selected channel to pass therethrough and a processor module performing beamforming on the selected channel based on a difference in gain value between the signal that has passed through the filter module and an original signal that has not passed through the filter module.