Variable Digital Filter Retuning for Spectrum-Agile Radios
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Solution Overview
Problem
Existing radio communication systems are inefficient in utilizing spectrum due to their inability to rapidly change frequency bands and channels, leading to suboptimal spectrum utilization in dynamic situations.
Innovation Solution
Implementing a spectrum agile radio with variable digital filters that can quickly retune by applying a windowing function to ideal filter coefficients, allowing for flexible and rapid adaptation to changing spectral conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If base stations use fixed frequency bands and channels commissioned during installation, then system stability and ease of operation are improved, but spectrum utilization efficiency deteriorates in dynamic situations
Solution Approach 1:
The patent implements dynamic frequency band switching by allowing base stations to rapidly change their operating frequency bands and channels based on real-time spectrum conditions. The system transitions from static commissioned configurations to dynamic adaptation, enabling base stations to seize opportunistic spectrum resources and respond to changing demand patterns in geographic and temporal dimensions.
Solution Approach 2:
The patent changes the operational parameters of base stations by enabling rapid modification of frequency band assignments and channel configurations. This allows the system to adapt spectrum usage parameters dynamically rather than being constrained by fixed commissioned settings, thereby improving spectrum utilization efficiency while maintaining operational stability through controlled parameter transitions.
2Device complexity
If base stations handle only a small number of fixed channels and bandwidths, then device complexity is reduced, but spectrum utilization efficiency deteriorates
Solution Approach 1:
The patent introduces dynamic channel and bandwidth configuration capabilities that allow base stations to adapt their spectral handling capacity in real-time. Rather than being limited to a small fixed set of channels, the system can dynamically allocate and reconfigure channel resources, enabling efficient utilization of available spectrum while managing complexity through automated control mechanisms.
3Reliability
If base stations cannot rapidly change frequency bands, then system reliability is improved through stable configurations, but adaptability to changing spectral conditions deteriorates
Solution Approach 1:
The patent implements a dynamic frequency band switching mechanism that allows base stations to rapidly transition between different frequency bands and channels. This dynamic capability enables the system to respond to changing spectral conditions and opportunistic spectrum availability while maintaining reliability through controlled and managed transition processes.
Solution Approach 2:
The patent incorporates feedback mechanisms that monitor spectrum conditions and demand patterns, enabling base stations to make informed decisions about frequency band transitions. This feedback-driven approach ensures that rapid changes in frequency bands are based on actual spectral conditions and network requirements, thereby maintaining system reliability while improving adaptability.
Data Source
AI summary
A spectrum agile radio having one or more variable digital filters is described. To quickly, yet accurately, retune the digital filter(s) a windowing function is applied to an ideal filter characteristic for each of one or more desired frequency bands to generate filter coefficients. Transitioning between coefficients of a previous filter and a current filter is handled to avoid problems associated with discontinuities in the signal processing.