Wideband DDS Channelizer Circuit for Jamming Waveform Generation
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Solution Overview
Problem
Existing digital wideband architectures face complexity in channelization, particularly when summing signals, due to the need to specify frequency and channel for each signal, which limits the efficiency of wideband channelized transmit architectures.
Innovation Solution
A wideband direct digital synthesizer (DDS) channelizer circuit that interprets frequency lists to create baseband I/Q signals, allowing multiple techniques to be multiplexed and commutated without requiring awareness of the channelized architecture, simplifying the transmit architecture and enabling efficient wideband jamming techniques like Chirp, Directed Random Pulse Modulation, and Wideband Noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If multiple parallel DDS circuits are used to create I/Q at very high rates for wideband channelized architectures, then the bandwidth capability is improved, but the device complexity and hardware requirements increase
Solution Approach 1:
The patent divides the wideband signal processing into multiple frequency-segregated channels, where each channel operates at a lower data rate. The channelizer circuit segments the input signal into N frequency channels, and the inverse channelizer recombines them at the output. This segmentation allows the system to achieve wideband capability through multiple narrowband channels rather than requiring a single high-speed parallel DDS circuit.
Solution Approach 2:
The patent introduces a time dimension through time-division multiplexing of the DDS circuit. Instead of using multiple parallel DDS circuits simultaneously, a single DDS circuit is time-multiplexed across multiple channels, with each channel being activated in sequence. This dimensional transformation from spatial parallelism to temporal sequencing reduces hardware complexity while maintaining wideband capability.
2Adaptability or versatility
If frequency and channel are calculated and specified for each signal in channelized architectures, then the signal processing capability is improved, but the device complexity increases
Solution Approach 1:
The channelizer circuit automatically performs frequency-to-channel mapping based on the input signal characteristics. Instead of requiring external specification of frequency and channel for each signal, the channelizer self-determines the appropriate channel assignment by analyzing the input frequency and applying the channelization algorithm internally. This self-service mechanism reduces the complexity of external control while maintaining adaptability.
Solution Approach 2:
The channelizer performs preliminary frequency analysis and channel assignment before the signal processing occurs. By pre-calculating the channel mapping based on the input frequency list, the system prepares the channel assignment in advance, eliminating the need for real-time frequency and channel calculation during signal processing. This preliminary action simplifies the overall system complexity.
3Adaptability or versatility
If each technique has a specific DDS associated with it and raw I/Q data are passed around data lanes, then the waveform generation capability is improved, but the device complexity and data processing overhead increase
Solution Approach 1:
The patent implements a universal DDS circuit that can generate waveforms for multiple techniques and channels. Instead of having dedicated DDS circuits for each technique, a single multi-functional DDS is time-multiplexed across different channels and techniques. The channelizer and inverse channelizer provide the framework that allows this universal DDS to serve multiple purposes, reducing hardware complexity while maintaining waveform generation capability.
Solution Approach 2:
The patent merges multiple separate waveform generation functions into a single integrated channelized DDS architecture. The channelizer, inverse channelizer, and DDS are combined into a unified system where the DDS serves all channels through time-multiplexing. This merging eliminates the need for separate DDS circuits for each technique and reduces the complexity of data lane management.
Data Source
AI summary
Embodiments of a system and method for providing efficient wideband inverse channelization for direct digital synthesizer based jamming techniques are generally described herein. In some embodiments, metadata associated with a technique for generating a waveform, such as frequency, phase and amplitude parameters, is received. Data select signals and data input are generated based on the received metadata. In-phase and quadrature signals are produced at an output of a first de-multiplexer and a second de-multiplexer, respectively, based on the data select signals and the data input. Frequency modulated signals generated by direct digital synthesizers may be combined in a channel using a separate, distinct channel combiner.