Diversity Turbo Equalizer Chains for Stable Multi-Antenna Convergence
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Solution Overview
Problem
Existing Turbo equalization techniques in communication receivers using antenna diversity face challenges in scalability, high data throughput, and convergence issues when implemented in separate chips or devices, especially when dealing with multiple processing chains.
Innovation Solution
The implementation of a diversity receiver with a master and slave equalizer chain configuration, where each chain includes an adaptive filter and decoder, with a weighted combination of filtered signals from both chains used to adapt coefficients, reducing data exchange and enabling modular, scalable, and stable convergence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bidirectional data exchange is implemented between separate processing chains for Turbo equalization, then equalization performance is improved, but device complexity and data throughput requirements increase significantly
Solution Approach 1:
The system divides the equalization function into separate processing chains (first chain with first adaptive filter and first decoder, second chain with second adaptive filter and second decoder), each operating independently on signals from different antennas. This segmentation allows parallel processing while reducing the need for complex bidirectional data exchange between chains.
Solution Approach 2:
Each processing chain uses feedback from its own decoder to adapt its adaptive filter coefficients (first coefficients for first chain, second coefficients for second chain). This local feedback mechanism eliminates the need for complex bidirectional feedback between separate chains, reducing device complexity while maintaining equalization performance.
2Adaptability or versatility
If multiple separate processing chains are used for antenna diversity, then adaptability to different channel conditions is improved, but scalability and implementation feasibility deteriorate due to convergence problems
Solution Approach 1:
The system segments the diversity processing into independent chains, each handling signals from specific antennas with dedicated adaptive filters and decoders. This segmentation enables each chain to adapt independently to its specific channel conditions while maintaining overall system scalability.
Solution Approach 2:
Each processing chain is self-sufficient, using its own decoder output to adapt its own adaptive filter coefficients without requiring data exchange or coordination with other chains. This self-service approach simplifies implementation and improves scalability while maintaining adaptability to various channel conditions.
3Ease of manufacture
If separate chips are used for each processing chain, then modularity is improved, but data throughput requirements and convergence stability worsen
Solution Approach 1:
The system is divided into separate processing chains that can be implemented on different chips or integrated circuits. Each chain is self-contained with its own adaptive filter, decoder, and coefficient adaptation logic, enabling modular manufacturing while maintaining convergence stability through independent local feedback.
Solution Approach 2:
Each separate processing chain implements local feedback from its decoder to its adaptive filter, ensuring stable convergence without requiring high-speed data exchange between chips. This local feedback mechanism maintains reliability even when chains are physically separated on different hardware components.
Data Source
AI summary
Apparatus includes a slave equalizer chain, which includes a first decoder and a first adaptive filter including first coefficients, and is configured to filter a first signal using the first adaptive filter to produce a first filtered signal, to decode the first filtered signal using the first decoder to generate a first output, and to adapt the first coefficients based at least on the first output. A master equalizer chain includes a second decoder and a second adaptive filter including second coefficients, and is configured to filter a second signal using the second adaptive filter to produce a second filtered signal, to calculate a weighted combination of the second filtered signal and the first filtered signal produced in the slave equalizer chain, to decode the weighted combination using the second decoder to generate a second output, and to adapt the second coefficients based at least on the second output.