Polyphase Filter Layout for Reconfigurable Oversampled Channelizers

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Solution Overview

Problem

Existing channelizer architectures are inefficient due to layout-based and performance-based issues such as duplicative circuitry, over-reliance on large registers, and underutilized mathematical operators, making them unsuitable for applications requiring dynamic reconfiguration and flexibility in size and power-constrained environments like airborne or spaceborne platforms.

Innovation Solution

A dynamically reconfigurable 2× oversampled channelizer using pipelined stages, polyphase filter, two-phase reorder circuit, FFT circuit, and two-phase merge circuit, allowing for in-field modification of frequency bins and their response, suitable for FPGAs, CPLDs, and ASICs, with reconfigurable parameters like filter coefficients and number of frequency bins.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If existing channelizer architectures are used, then channelization function is provided, but resource duplication and inefficiency occur leading to high computational complexity

Engineering Contradiction:

Improvechannelization efficiencyVSAvoidcomputational complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent merges multiple channelizer functions into a single reconfigurable architecture that can dynamically adapt to different channelization requirements. The polyphase filter bank and FFT processor are integrated into one system that can be reconfigured via control signals, eliminating the need for multiple separate channelizer circuits and reducing resource duplication.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The channelizer employs dynamic reconfiguration capabilities where filter coefficients, number of channels, and frequency bin configurations can be changed in real-time through control signals. This dynamic adaptability allows the system to optimize its computational complexity for different operating conditions while maintaining high channelization efficiency.

Inventive Principle:

Principle #15Dynamics

2Adaptability or versatility

If fixed channelizer configurations are used, then design simplicity is maintained, but adaptability to different frequency ranges and channelization requirements is limited

Engineering Contradiction:

Improvedynamic reconfiguration capabilityVSAvoidreconfiguration control complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent creates a universal channelizer architecture that can perform multiple channelization functions across different frequency ranges and resolutions. The single reconfigurable system replaces multiple specialized channelizers, achieving versatility through shared hardware resources controlled by programmable parameters.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The channelizer achieves adaptability by changing operational parameters such as filter coefficients, number of polyphase sections, and FFT size through control signals. These parameter changes allow the system to adapt to different frequency ranges and channelization requirements without physical reconfiguration, managing complexity through software-controlled parameter adjustment.

Inventive Principle:

Principle #35Parameter changes

3Productivity

If multiple customized channelizers are deployed for different applications, then application-specific optimization is achieved, but size, weight, and power constraints are violated

Engineering Contradiction:

Improveapplication-specific performanceVSAvoidpower consumption

Core Design Contradiction:

ProductivityVSUse of energy by stationary object

Solution Approach 1:

The patent implements a single reconfigurable channelizer that can be programmed to optimize performance for different applications including radar, communications, and electronic warfare. This universal approach replaces multiple application-specific channelizers, significantly reducing power consumption while maintaining the ability to achieve application-specific optimization through software configuration.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS20230421137A1Polyphase filter for a dynamically reconfigurable oversampled channelizer

Publication Date: 2023.12.28 BAE SYSTEMS INFORMATION ANDELECTRONIC SYSTEMS INTEGRATION INC

AI summary

Techniques are provided for a polyphase filtering in a dynamically reconfigurable two times (2×) oversampled channelizer. A polyphase filter implementing the techniques according to an embodiment includes a first plurality of dual port memory circuits and a multiplexer circuit configured to distribute input data for storage to the first plurality of dual port memory circuits. The polyphase filter also includes a second plurality of dual port memory circuits configured to store polyphase filter coefficients and a data alignment crossbar circuit configured to align the input data stored in the first plurality of dual port memory circuits with the polyphase filter coefficients stored in the second plurality of dual port memory circuits. The polyphase filter further includes a multiply circuit configured to perform multiplications of the aligned input data with the polyphase filter coefficients and an adder circuit to sum the results of the multiplications to generate a filtered output.