Frequency-Agile Transmitter Linearization for LMR Emission Compliance
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Solution Overview
Problem
Multi-carrier systems used in cellular technologies are not suitable for Land Mobile Radio (LMR) systems as they are not compliant with emission requirements, not optimized for dynamic carrier conditions, not scalable, and not fault tolerant.
Innovation Solution
A frequency agile RF transmitter with multiple banks of multi-carrier power amplifiers, each equipped with a linearizer, and an electronic processor that receives timestamped carrier configurations, segments them into time segments, determines composite carrier configurations, and provides correction solutions to the linearizers to manage dynamic carrier attributes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cellular multi-carrier systems are used, then transmission capability is provided, but compliance with LMR emission requirements is not achieved
Solution Approach 1:
The system dynamically changes carrier attributes (frequency, bandwidth, power) to comply with LMR emission requirements while maintaining transmission capability. The electronic processor adjusts these parameters in real-time based on LMR spectrum conditions, transforming a cellular system into an LMR-compliant system.
Solution Approach 2:
The transmitter implements dynamic carrier configuration where attributes are not static but can be adjusted in real-time. This allows the system to adapt to changing LMR spectrum conditions and emission requirements, making it suitable for LMR applications while maintaining the multi-carrier transmission capability.
2Reliability
If static carrier attributes are used, then system simplicity is maintained, but optimization for dynamic carrier conditions is not achieved
Solution Approach 1:
The system transitions from static to dynamic carrier attributes, allowing real-time adjustment of frequency, bandwidth, and power based on LMR spectrum conditions. This dynamic capability optimizes performance for varying carrier conditions while the electronic processor manages the complexity through automated control.
Solution Approach 2:
The electronic processor automatically manages and adjusts carrier attributes based on received configurations and spectrum conditions, making the system self-regulating. This reduces the need for manual intervention and handles the complexity internally while providing optimized performance.
3Adaptability or versatility
If frequency agile transmitters are implemented, then adaptability to LMR spectrum is improved, but system complexity increases
Solution Approach 1:
The transmitter implements frequency agility by allowing dynamic adjustment of carrier frequencies and other attributes. The electronic processor manages this complexity by receiving timestamped carrier configurations and automatically adjusting the transmitter parameters, achieving adaptability without requiring complex manual configuration.
Solution Approach 2:
The electronic processor serves multiple functions: receiving carrier configurations, segmenting time segments, determining composite configurations, and controlling the linearizer. This multi-functionality consolidates complexity into a single control unit, achieving frequency agility while managing system complexity through integration.
4Reliability
If multiple banks of power amplifiers with linearizers are used, then fault tolerance and scalability are improved, but device complexity increases
Solution Approach 1:
The system divides power amplifiers into multiple banks, allowing independent operation and failure isolation. Each bank can be controlled separately, and the electronic processor can select which banks to operate based on conditions, providing fault tolerance while managing complexity through modular organization.
Solution Approach 2:
The electronic processor controls multiple amplifier banks and linearizers through a unified control mechanism, receiving carrier configurations and distributing appropriate control signals to each bank. This multi-functional control approach manages the complexity of multiple amplifiers through centralized intelligence.
5Adaptability or versatility
If multiple banks of power amplifiers with linearizers are used, then system scalability is improved, but device complexity increases
Solution Approach 1:
The modular bank structure allows the system to scale by adding or removing banks as needed. Each bank is a self-contained unit that can be independently configured and controlled, enabling scalable deployment from small to large systems while managing complexity through standardized modular units.
Solution Approach 2:
The electronic processor provides universal control across all amplifier banks, using the same control mechanisms and interfaces regardless of the number of banks. This universal control approach enables scalability without proportionally increasing control complexity, as the processor handles any number of banks through standardized procedures.
Data Source
AI summary
Apparatus and method for selective linearization of scalable fault tolerant frequency agile transmitters. In one embodiment, the method includes receiving timestamped carrier configurations and segmenting the timestamped carrier configurations into time segments having a pre-determined time length. The method also includes determining composite carrier configuration in a present time segment for a predetermined number of future time segments and determining a correction solution of a plurality of correction solutions associated with the composite carrier configuration in a mapping of a plurality of carrier configurations and the plurality of correction solutions. The method includes providing the correction solution to a linearizer of at least one of a plurality of multi-carrier power amplifiers. The plurality of power amplifiers are provided in one or more banks of multi-carrier power amplifiers.