Digital Pulse Shaping Filter Architecture With Sampling-Rate-Independent Taps
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Solution Overview
Problem
Existing wireless communication systems face increased power consumption and hardware complexity due to the need for higher spectral efficiency, particularly at higher frequencies, where more signal taps and components are required for pulse shaping, leading to larger devices and reduced battery life in mobile applications.
Innovation Solution
A pulse shaping filter architecture that includes a plurality of memory elements and taps, where the number of taps is independent of the sampling rate, and coefficient values are generated without using multipliers, allowing for efficient pulse shaping without increasing hardware complexity or power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of signal taps is increased to provide operation at higher frequencies, then spectral efficiency is improved, but power consumption increases
Solution Approach 1:
The filter is divided into multiple sections where each section processes a subset of taps. This segmentation allows parallel processing of tap coefficients, reducing the overall computation time and power consumption while maintaining the required spectral efficiency at higher frequencies
Solution Approach 2:
The patent changes the computational parameters by pre-calculating and storing tap coefficients in lookup tables. This transforms the real-time multiplication operations into simpler table lookup and addition operations, significantly reducing power consumption while maintaining spectral efficiency
2Productivity
If the number of signal taps is increased to provide operation at higher frequencies, then spectral efficiency is improved, but device size increases
Solution Approach 1:
The same hardware structure is designed to handle multiple frequency operations through configurable tap coefficients. By making the filter structure universal and reconfigurable, the device maintains high spectral efficiency across different frequencies without requiring separate hardware for each frequency band, thus avoiding device size increase
Solution Approach 2:
Instead of implementing multiple full filter structures for different frequencies, the patent uses a single filter structure with copied and reused tap coefficient sets. This allows the system to achieve high spectral efficiency at various frequencies while maintaining a compact device size through coefficient reuse
3Productivity
If the number of multipliers is increased to process signals from each tap, then spectral efficiency is improved, but hardware complexity increases
Solution Approach 1:
The patent extracts the multiplication operation from the real-time processing path and pre-computes these values offline. By taking out the complex multiplication operations and replacing them with pre-computed lookup tables, the hardware complexity is significantly reduced while spectral efficiency is maintained through efficient addition-based processing
Solution Approach 2:
The tap coefficients are pre-calculated and stored in lookup tables before runtime. This preliminary action eliminates the need for complex real-time multiplication hardware, reducing hardware complexity while maintaining spectral efficiency through efficient coefficient retrieval and addition operations
Data Source
AI summary
A method and architecture for pulse shaping are provided. The architecture includes a pulse shaping filter having a plurality of memory elements and a plurality of taps connected to the plurality of memory elements wherein a total number of the plurality of taps is independent of a sampling rate. The pulse shaping filter further includes a selector configured to select outputs from the plurality of taps to define a pulse shaped output.