Radio Scene Emulator Dynamic Waveform Simulation
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Solution Overview
Problem
Conventional radio scene emulators are static and limited in scope, failing to accurately simulate complex radio environments necessary for testing advanced wireless communication standards and future cognitive radio systems, which require dynamic simulation of multiple waveforms and frequencies.
Innovation Solution
A system that uses a graphical user interface and processing device to define and emulate radio scenes by selecting waveforms, specifying their characteristics, and defining time patterns, allowing for dynamic simulation across frequency and time axes, including deterministic and model-based modes, and enabling the creation of user-defined waveforms and power profiles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional radio scene emulators are used, then the device complexity is reduced, but the adaptability and versatility are limited
Solution Approach 1:
The radio scene emulator is divided into separate functional modules including a waveform generator module, a modulator module, a frequency synthesizer module, and a control module. Each module handles a specific aspect of waveform generation and manipulation, allowing the system to support multiple waveform types and frequency ranges without requiring a complete redesign of the entire system.
Solution Approach 2:
The emulator employs a universal signal generation architecture that can produce multiple waveform types (sinusoidal, square, triangular, custom) through a single integrated system. The frequency synthesizer is designed to operate across a wide frequency range by switching between different oscillation modes, and the modulator can apply various modulation schemes (AM, FM, PM, QAM) using the same hardware platform.
2Measurement precision
If static emulation is used, then the ease of operation is maintained, but the measurement precision and reliability are insufficient
Solution Approach 1:
The radio scene emulator transitions from static waveform generation to dynamic time-varying signal synthesis. The system incorporates time-dependent parameters including variable amplitude envelopes, frequency modulation over time, and programmable waveform sequences that can adapt to different radio scene conditions. The control module allows real-time adjustment of emission patterns, duty cycles, and temporal characteristics to accurately reproduce dynamic radio environments.
3Adaptability or versatility
If single-carrier single-waveform devices are used, then the device complexity is minimized, but the adaptability for future standards is limited
Solution Approach 1:
The emulator implements a nested architecture where multiple carrier signals are generated by nesting frequency synthesizers within each other. Each carrier can be independently configured with its own waveform type, modulation scheme, and power level. The system supports carrier aggregation by nesting multiple such carrier configurations within a single emission pattern definition, allowing hierarchical control from individual waveform parameters up to overall radio scene characteristics.
Data Source
AI summary
A system for defining a radio scene to be emulated includes a display device configured to display a graphical user interface having a grid and at least one waveform block, representing at least a portion of a waveform, included in the grid in response to selection of a type of the waveform, at least one specification of the waveform, and a time pattern of the waveform. The grid has a frequency axis and a time axis, and the at least one waveform block extends along the time axis of the grid according to the time pattern of the waveform.