Digital Signal Generation Circuit for Dynamic DAC Symbol Allocation
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Solution Overview
Problem
Compression shaping in optical fiber communication systems can lead to deteriorated output signal quality and system instability due to changes in average symbol energy when communication traffic decreases.
Innovation Solution
A transmission digital signal generation circuit that converts symbol occurrence probability into a histogram and dynamically allocates DAC output values based on cumulative frequency, ensuring proper allocation and margin for symbols with high occurrence probability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If compression shaping is applied to optimize data transmission, then data compression efficiency is improved, but output signal quality deteriorates when communication traffic decreases
Solution Approach 1:
The patent implements dynamic DAC allocation that adapts to changing communication traffic conditions. The system continuously monitors symbol occurrence probabilities and adjusts DAC output value allocations in real-time, transitioning from static to dynamic resource allocation to maintain signal quality across varying traffic loads while preserving compression efficiency
Solution Approach 2:
The patent changes the allocation parameters of DAC output values based on symbol occurrence probabilities. By adjusting the mapping between symbols and DAC output values according to their probability distributions, the system optimizes signal quality for current traffic conditions while maintaining compression benefits
2Productivity
If compression shaping is applied to reduce data volume, then communication bandwidth utilization is improved, but system stability deteriorates when average symbol energy changes
Solution Approach 1:
The patent implements a feedback mechanism that monitors symbol occurrence probabilities and uses this information to adjust DAC allocations. This closed-loop control ensures the system adapts to changing traffic patterns and average symbol energy levels, maintaining stability while utilizing compression shaping for bandwidth efficiency
Solution Approach 2:
The patent performs preliminary allocation of DAC output values based on expected symbol probabilities before actual transmission occurs. By pre-configuring allocations according to probability distributions, the system prepares optimal mappings in advance, ensuring stability when traffic patterns change
3Device complexity
If fixed DAC allocation is used to simplify system design, then device complexity is reduced, but signal quality deteriorates due to clipping when symbol energy varies
Solution Approach 1:
The patent transitions from fixed to dynamic DAC allocation, where the system automatically adjusts allocations based on monitored symbol occurrence probabilities. This dynamic adaptation prevents clipping artifacts that occur with fixed allocations when symbol energy varies, maintaining signal quality without requiring complex manual configuration
Data Source
AI summary
An optical transmitter according to the technology of the present disclosure converts an occurrence probability of a symbol into a histogram, and determines allocation of a DAC on the basis of a cumulative frequency of the histogram, a class value of the histogram is a value of the symbol, a frequency is non-zero in any class, and a total number of the frequencies is a quantization number of the DAC.