Receiver Clock Frequency Configuration for Interference Reduction
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Solution Overview
Problem
Communication receivers face interference issues due to clock signals, particularly in broadband receivers with multiple clock signals, where harmonic products often fall within the receiver's input bandwidth, degrading signal reception.
Innovation Solution
A method and system that dynamically calculate and set preferred clock frequencies to tune to a target channel while ensuring that harmonic products fall outside the receiver's input bandwidth, reducing interference by searching through multiple combinations of clock frequencies and configuring them on the fly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple clock signals are used in broadband receivers, then the receiver can cover multiple wide spectral bands, but harmonic products of the clock signals fall within the receiver's input bandwidth causing interference
Solution Approach 1:
The patent implements dynamic clock frequency selection by maintaining a plurality of clock sources with different frequencies and selectively activating appropriate clock sources based on the desired reception frequency. The system dynamically determines which clock source to use for each reception scenario, rather than relying on a single fixed clock frequency, thereby avoiding harmonic interference while maintaining broadband coverage capability
Solution Approach 2:
The patent changes the operational parameters (clock frequencies) of the receiver system to resolve interference issues. By switching between different clock frequency values from available clock sources, the system ensures that harmonic products of the selected clock frequency do not fall within the receiver's input bandwidth, thus eliminating interference while preserving multi-band reception capability
2Ease of operation
If preferred clock frequencies are pre-defined and stored for each channel, then tuning to target channels is simplified, but memory resources are consumed and flexibility is reduced
Solution Approach 1:
The patent implements a self-service mechanism where the receiver automatically determines the appropriate clock source to use based on the desired reception frequency. The system includes a clock source selection module that autonomously evaluates available clock sources, calculates their harmonic products, and selects the most suitable clock source without requiring pre-stored configuration data, thereby eliminating memory overhead while maintaining ease of operation
Solution Approach 2:
The patent replaces the traditional mechanical approach of pre-storing clock frequency tables in memory with a computational approach. The system uses a processor to dynamically calculate and determine appropriate clock frequencies based on real-time reception requirements, substituting memory storage with algorithmic computation to achieve both flexibility and ease of operation
Data Source
AI summary
A method includes, in a receiver that operates using multiple clock signals having respective clock frequencies, accepting a request to receive a target channel frequency. In response to the request, a set of preferred clock frequencies is calculated, which when applied by the receiver will cause the receiver to tune to the target channel frequency while satisfying a predefined criterion relating to interference caused by the clock signals. The target channel frequency is received by setting the clock signals to the preferred clock frequencies.