Single IFFT Block for Multi-Carrier Baseband Signal Generation
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Solution Overview
Problem
In 5G mobile communication systems, existing methods require multiple IFFT blocks and separate circuit configurations for each component carrier, increasing complexity and cost when generating baseband signals using the carrier aggregation technique.
Innovation Solution
A method and apparatus that transform frequency-domain signals of multiple component carriers into a single time-domain signal using a single IFFT block, eliminating the need for separate circuit configurations by performing a frequency shift and adding a cyclic prefix, thereby generating a baseband signal efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple IFFT blocks and separate circuit configurations are used for each component carrier, then each component carrier can be processed independently, but the device complexity and cost increase
Solution Approach 1:
The patent merges multiple IFFT blocks into a single IFFT block by combining the frequency-domain signals of multiple component carriers into one unified signal. This consolidation maintains the independent processing capability of each component carrier while significantly reducing the number of separate circuit configurations needed, thereby resolving the contradiction between reliability and device complexity
Solution Approach 2:
The single IFFT block is designed to handle multiple component carriers simultaneously, making it a multi-functional device. This universal approach allows one IFFT block to perform the work of multiple separate blocks, reducing overall circuit complexity while maintaining the ability to process each component carrier independently
2Productivity
If multiple IFFT blocks are used for generating baseband signals of multiple component carriers, then each carrier gets dedicated processing resources, but the cost and circuit configuration increase
Solution Approach 1:
Multiple IFFT blocks are merged into a single IFFT block that processes combined frequency-domain signals from multiple component carriers. This merging maintains full baseband signal generation capability for all carriers while eliminating redundant circuit configurations, thus improving productivity relative to device complexity
3Speed
If separate circuit configurations are used for each component carrier, then processing can be done in parallel, but the cost and complexity increase
Solution Approach 1:
The patent merges multiple separate circuit configurations into a single integrated IFFT block that processes combined signals. The processing speed is maintained through efficient single-block operation, while the circuit complexity is reduced by eliminating redundant separate configurations
Data Source
AI summary
A baseband signal generation method includes mapping frequency-domain data for a plurality of component carriers to subcarrier resources; performing a frequency shift on the frequency domain-data allocated to the subcarrier resources; generating a time-domain signal by performing IFFT on the frequency-shifted frequency-domain data using a single IFFT block; and generating a time-domain baseband signal by adding a CP to the time-domain signal.