Symbol-Synchronous Continuous Fast Convolution for Flexible 5G Subbands
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Solution Overview
Problem
Existing 5G communication systems face challenges in achieving high spectral containment and flexibility in multiplexing multiple subbands due to the limitations of conventional CP-OFDM and continuous FC processing schemes, particularly when dealing with mixed numerologies and abrupt changes in bandwidth or center frequency.
Innovation Solution
Implementing a symbol-synchronous continuous fast-convolution-based processing scheme that dynamically adjusts the overlap between FC processing blocks, allowing for flexible configuration of filtering parameters to improve spectral containment and reduce memory and latency requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional CP-OFDM processing is used, then implementation is simple, but spectral containment is insufficient
Solution Approach 1:
The patent segments the continuous signal processing into discrete Fast Convolution blocks operating in the frequency domain. Each block processes specific subbands with independent filtering, allowing precise spectral control while maintaining computational feasibility through modular implementation.
Solution Approach 2:
The patent replaces time-domain convolution operations with frequency-domain Fast Convolution processing. This substitution transforms the mechanical signal processing approach into a computationally efficient frequency-domain operation, achieving better spectral containment while reducing computational complexity.
2Object-generated harmful factors
If continuous FC processing is used, then spectral containment improves, but flexibility in multiplexing multiple subbands deteriorates
Solution Approach 1:
The patent introduces dynamic configurability to the FC processing blocks, allowing runtime adjustment of filtering parameters, subband assignments, and numerology configurations. This dynamic adaptation enables flexible multiplexing of multiple subbands while preserving spectral containment benefits.
Solution Approach 2:
The patent enables independent configuration of filtering parameters for different subbands and numerologies. By allowing parameter changes across multiple dimensions (filter width, block size, sampling rates), the system achieves both spectral containment and multiplexing flexibility simultaneously.
3Device complexity
If unified FC processing block length is used, then implementation is simplified, but performance deteriorates with abrupt bandwidth changes
Solution Approach 1:
The patent makes the FC processing block length dynamic rather than fixed. Block lengths adapt to the specific subband and numerology being processed, allowing optimal performance for each configuration while maintaining implementation simplicity through standardized control mechanisms.
Solution Approach 2:
The patent applies different FC processing block lengths to different subbands and numerologies based on their specific requirements. Each local processing region is optimized for its particular characteristics, achieving high performance across diverse scenarios without requiring a completely complex unified system.
4Productivity
If filtering parameters are adjusted for each subband, then multiplexing efficiency improves, but memory and latency requirements increase
Solution Approach 1:
The patent designs the FC processing blocks with universal structures that can handle multiple subbands and numerologies. By using common processing frameworks and shared resources across different subband configurations, the system achieves high multiplexing efficiency without proportionally increasing memory and latency requirements.
Data Source
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Figure 3B
AI summary
According to an aspect, there is provided an apparatus comprising for performing the following. The apparatus receives a stream of orthogonal frequency division multiplexing symbols and associated cyclic prefixes produced by at least one orthogonal frequency- division multiplexing modulator of a radio transmitter or transceiver. The apparatus divides said stream into a plurality of overlapping processing blocks of a first length. At least one of the plurality of overlapping processing blocks comprises a non-overlapping section having values corresponding to a segment of said stream. The dividing comprises adjusting a length of the non-overlapping section at least based on whether a cyclic prefix is comprised in said segment and, if this is true, on a length of said cyclic prefix. The apparatus filters the plurality of overlapping processing blocks using fast convolution processing and concatenates filtered processing blocks to form an output signal for transmission using the radio transmitter or transceiver.