Signal Receiving Circuit with MLSE for ISI and Noise Errors
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Solution Overview
Problem
High-speed electronic devices face signal distortion issues due to noise from external factors and channel response characteristics, leading to abnormal operation of decision feedback equalizers and subsequent errors in data reception.
Innovation Solution
A signal receiving circuit incorporating a receiving equalizer and a maximum likelihood sequence estimator (MLSE) to compensate for inter-symbol interference and perform Viterbi decoding, improving reliability and reducing calculation burden by determining a termination symbol based on equalization data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a decision feedback equalizer is used to cancel signal distortion, then signal distortion compensation is improved, but noise production increases and abnormal operation occurs at high communication speeds
Solution Approach 1:
The patent introduces a termination symbol determination unit as an intermediary component between the receiving equalizer and the MLSE. This unit determines a termination symbol based on equalization data from the receiving equalizer, which then serves as a reliable input for the MLSE's Viterbi decoding process. This intermediary step prevents noise propagation while maintaining signal distortion compensation effectiveness.
Solution Approach 2:
The patent implements a feedback mechanism where the receiving equalizer processes the received signal and generates equalization data, which is then used by the termination symbol determination unit. The determined termination symbol feeds back into the MLSE process, creating a closed-loop system that continuously optimizes signal reception while monitoring and correcting for noise and distortion effects.
2Reliability
If a decision feedback equalizer is used, then signal distortion is compensated, but errors affect subsequent data reception causing successive errors
Solution Approach 1:
The patent applies beforehand cushioning by determining the termination symbol in advance based on equalization data before the MLSE processing begins. This pre-determined termination symbol acts as a cushion or protective measure that prevents error propagation to subsequent data reception, ensuring that even if errors occur during processing, they do not cascade to affect future data blocks.
Solution Approach 2:
The termination symbol determination unit serves as an intermediary that processes equalization data and produces a cleaned, validated termination symbol. This intermediary step filters out potential errors before they can propagate through the MLSE process to subsequent data, maintaining data integrity across multiple reception operations.
3Reliability
If Viterbi decoding is performed without determining termination symbol from equalization data, then calculation burden increases, but reliability improves
Solution Approach 1:
The patent applies partial action by having the termination symbol determination unit process only the necessary equalization data to determine the termination symbol, rather than performing complete Viterbi decoding on all received data immediately. This selective processing reduces the calculation burden while maintaining reliability, as the termination symbol provides sufficient guidance for the subsequent MLSE operation without requiring exhaustive computation on all possible paths.
Data Source
AI summary
A signal receiving circuit may include a receiving equalizer and a sequence estimator. The receiving equalizer may be configured to compensate an inter-symbol interference in a signal from an external to output an equalization data, based on a receiving signal from an outside. The sequence estimator may be configured to determine a termination symbol, based on the equalization data, to perform a decoding on the receiving signal, based on the determined termination symbol, and to output the decoded receiving signal as a sequence data.