Dynamic Symbol Upsampling for Variable Rates
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Solution Overview
Problem
Existing wireless communications systems face inefficiencies in symbol shaping and upsampling, particularly when dealing with varying symbol rates, leading to inflexibility and wastage of processing resources.
Innovation Solution
A system that performs symbol shaping and upsampling in a manner that retains all or substantially all digital samples, using techniques like root-raised cosine filtering and polyphase filtering, to accommodate variable symbol rates and ensure efficient processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional upsampling methods are used to accommodate variable symbol rates, then the system can handle different symbol rates, but processing resources are wasted due to generation and subsequent discarding of excessive digital samples
Solution Approach 1:
The system dynamically adjusts the upsampling factor based on the actual symbol rate requirements. By changing the sampling parameter adaptively rather than using a fixed high upsampling factor, the system accommodates variable symbol rates while generating only the necessary number of digital samples, thus avoiding processing resource wastage.
Solution Approach 2:
The upsampling configuration is made dynamic and adjustable according to real-time symbol rate conditions. The system can modify its processing parameters on-the-fly to match the required symbol rate, ensuring that processing resources are utilized efficiently without generating excessive samples that would need to be discarded.
2Manufacturing precision
If high upsampling factors are used to reduce distortion, then signal quality improves, but system complexity and processing overhead increase
Solution Approach 1:
Instead of always using high upsampling factors, the system adjusts the upsampling parameter based on the specific requirements of each symbol rate. This adaptive approach maintains signal quality by applying appropriate upsampling only when necessary, thereby reducing distortion without unnecessarily increasing system complexity and processing overhead.
3Productivity
If digital samples are discarded to match processing rates, then processing efficiency is maintained, but information loss occurs
Solution Approach 1:
The system changes its processing parameters to match the symbol rate requirements exactly, generating only the necessary number of digital samples. This eliminates the need to discard samples while maintaining processing efficiency, as the upsampling factor is dynamically adjusted to produce the precise number of samples needed for subsequent processing stages.
Data Source
AI summary
A system can include a phase timing offset component that generates a first signal to indicate an offset of a first symbol from a reference signal and an accumulator component that combines the offset of the first symbol with a first phase increment based on the reference signal. The system can additionally include a memory that stores a first shaping parameter to modify a filter coefficient to be applied to the first symbol based on the first phase increment and an interpolator that modifies the first shaping parameter for the first phase increment to adjust for the offset of the first symbol.