Dual-Decoder Receive Circuit for Noisy Satellite Signals
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Solution Overview
Problem
Existing receive circuits are inadequate in correcting errors in noisy transmission media, particularly in radio channel transmissions from satellites, where the number of corrected errors is insufficient.
Innovation Solution
A dual-channel receive circuit with a first decoding system using a Viterbi algorithm and a second decoding system employing Reed-Solomon error-correction decoders, along with a delay device and control mechanisms to enhance error correction by utilizing validity bits and improved decoding algorithms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single decoding system is used, then the device complexity is low, but the error correction capability is insufficient in noisy transmission media
Solution Approach 1:
The decoding system is divided into two independent decoding systems, each with its own decoder and deinterleave device. The first decoding system processes the coded signal independently and provides error-free portions, while the second decoding system uses these error-free portions to correct errors in the coded signal. This segmentation allows each subsystem to be optimized for specific error correction tasks, improving overall reliability without requiring a single overly complex decoder.
Solution Approach 2:
The error-free portions from the first decoding system act as an intermediary to assist the second decoding system. These error-free portions are used to control the second decoder and provide reference information for correcting errors in the coded signal. This intermediary approach allows the second decoding system to leverage reliable data without requiring complete redundancy of the entire decoding path.
2Reliability
If dual-channel receive circuit is implemented, then more errors are corrected, but the device complexity increases
Solution Approach 1:
The two decoding systems are merged into a single integrated receive circuit architecture. The first decoding system (with decoder 100 and deinterleave device 101) and the second decoding system (with decoder 111 and deinterleave device 112) share common components such as the coded signal input and are coordinated through control means. This merging allows the circuit to achieve enhanced error correction capability while avoiding the complexity of completely separate dual-channel receivers.
Solution Approach 2:
The first decoding system performs preliminary decoding to identify error-free portions before the second decoding system attempts to correct errors. The control means uses the output from the first decoding system to prepare control signals for the second decoder in advance. This preliminary action allows the second decoding system to focus computational resources on correcting specific error-prone portions rather than processing the entire signal independently.
Data Source
AI summary
A method and a circuit for decoding a coded signal including a first decoding system capable of receiving the coded signal and of providing a first signal comprising portions considered correct and a second decoding system capable of providing a second signal from the coded signal and from portions considered correct of the first signal.