Dynamic Interleaver Memory Allocation for Channel Adaptation
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Solution Overview
Problem
Existing data communication systems face inefficiencies in allocating memory between interleaver and de-interleaver buffers, as the optimal memory allocation depends on actual channel conditions, which are often unknown at the time of modem configuration, leading to suboptimal noise protection and data rate management.
Innovation Solution
A communication device dynamically allocates memory between interleaver and de-interleaver buffers based on real-time upstream and downstream channel conditions, using a memory allocation unit to determine data rate estimates and revise initial allocations as needed, ensuring optimal memory distribution even under changing channel conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If fixed memory allocation is used between interleaver and de-interleaver buffers based on configuration parameters, then device complexity is reduced and ease of operation is improved, but noise protection capability and data rate management become suboptimal under varying channel conditions
Solution Approach 1:
The patent applies dynamics by transitioning from fixed memory allocation to dynamic memory allocation. The system continuously monitors actual channel conditions (impulse noise levels, data rate, delay) and adjusts the memory allocation between interleaver and de-interleaver buffers in real-time. This allows the system to adapt to varying channel conditions and maintain optimal noise protection capability while preserving ease of operation through automated adjustment.
Solution Approach 2:
The patent implements feedback by using actual measured channel conditions to adjust memory allocation. The system monitors parameters such as impulse noise protection, data rate, and delay, compares them against allocation criteria, and modifies the memory distribution accordingly. This feedback mechanism ensures that noise protection capability is maintained at optimal levels while the system remains easy to operate through automatic adaptation.
2Adaptability or versatility
If memory allocation is based on worst-case or expected channel conditions, then adaptability to different conditions is improved, but productivity (data rate) is reduced due to conservative allocation
Solution Approach 1:
The system dynamically adjusts memory allocation based on actual channel conditions rather than using fixed conservative allocations. When channel conditions are better than worst-case scenarios, the system allocates memory more aggressively to improve data rate. When conditions deteriorate, allocation adjusts to maintain noise protection. This dynamic approach achieves both high adaptability and optimized productivity.
Solution Approach 2:
The patent changes the allocation parameters based on measured channel conditions. The system monitors parameters such as impulse noise protection levels, data rate, and delay, and uses these measurements to adjust memory allocation proportions. This parameter adjustment allows the system to adapt to varying conditions while maximizing data rate performance rather than being constrained by conservative worst-case assumptions.
3Reliability
If more memory is allocated to interleaver buffer to enhance noise protection, then noise protection capability is improved, but device complexity increases due to additional memory management requirements
Solution Approach 1:
The system performs self-service by automatically adjusting its own memory allocation based on monitored channel conditions. Rather than requiring external intervention or complex manual configuration, the system self-regulates the memory distribution between interleaver and de-interleaver buffers. This automatic self-adjustment maintains high noise protection capability while avoiding the complexity of manual memory management.
Solution Approach 2:
The patent uses feedback mechanisms to automatically regulate memory allocation. The system continuously monitors channel conditions and uses this information to adjust memory distribution without external intervention. This feedback-driven self-regulation achieves enhanced noise protection capability while keeping device complexity manageable through automation.
4Productivity
If memory allocation is optimized for upstream channel conditions, then upstream data rate is improved, but downstream noise protection may be compromised
Solution Approach 1:
The patent applies local quality by considering upstream and downstream channel conditions separately and allocating memory to address specific local requirements. The system monitors and adjusts allocation based on the particular conditions of each direction, allowing optimization of upstream data rate when conditions permit while maintaining downstream noise protection when needed. This localized optimization approach resolves the contradiction between directional performance requirements.
Data Source
AI summary
According to one embodiment, memory is allocated between an interleaver buffer and a de-interleaver buffer in a communication device based on downstream and upstream memory requirements. The upstream de-interleaver memory requirement is determined based on upstream channel conditions obtained for a communication channel used by the communication device. The memory is allocated between the interleaver and de-interleaver buffers based on the downstream and upstream memory requirements. The downstream interleaver memory requirement may be determined based on one or more predetermined downstream configuration parameters. Alternatively, the downstream interleaver memory requirement may also be determined based on the upstream channel conditions by estimating the downstream capacity of the communication channel based on the upstream channel conditions and determining an interleaver buffer size that satisfies one or more predetermined downstream configuration parameters and the downstream capacity estimate.