Pre-DPD Power Detection Using Carrier Sampling to Cut Delay
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Solution Overview
Problem
Existing Digital Pre-Distortion (DPD) modules in Remote Radio units introduce significant delay and computation costs due to the need for power computation before data input, impacting system performance.
Innovation Solution
A method and apparatus for low-delay power detection that involves obtaining effective carrier information, sampling carrier data, determining total power before Digital Up Conversion or Crest Factor Reduction, and performing power adjustment using this total power to compensate for power loss, thereby reducing system delay and computation costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If power computation is performed before DPD module using search table structure, then power detection accuracy is improved, but system delay increases and computation cost increases
Solution Approach 1:
The patent performs power computation at an earlier stage in the signal processing chain, specifically before the Digital Up Conversion (DUC) module, rather than after. This preliminary action allows the power detection to be completed earlier, reducing the overall system delay while maintaining accuracy through the use of pre-configured carrier information and efficient sampling methods
2Measurement precision
If power computation is performed before DPD module using search table structure, then power detection accuracy is improved, but computation cost increases
Solution Approach 1:
The patent extracts and processes only the essential carrier information needed for power computation, rather than processing all signal data. By focusing on specific carrier components and using pre-configured system carrier information, the computation is simplified and made more efficient while still achieving accurate power detection results
Solution Approach 2:
The patent changes the approach to power computation by performing it at a different stage (before DUC) and using different parameters (carrier information from configuration rather than full signal processing). This parameter change enables more efficient computation with reduced complexity while maintaining the required accuracy for power detection
Data Source
AI summary
Disclosed are a power adjustment method and an apparatus based on low delay power detection before digital pre-distortion. The method comprises the following steps: according to pre-configured system carrier information, obtaining effective carrier information containing an effective carrier channel corresponding to each effective carrier; performing sampling on carrier data of each effective carrier channel according to the obtained effective carrier information, and then calculating combination power Pa of effective carriers before digital up conversion or digital peak clipping cancellation according to the sampling; and using the combination power Pa of the effective carriers to perform power adjustment before digital pre-distortion. The present invention moves power calculation ahead of an up conversion module, fully utilizes inherent delay of digital up conversion and a peak clipping module to offset time required for the power calculation, and effectively reduces system delay.