A Selective Protection Method Based on Viterbi Decoder

Abstract

The invention relates to a selective protection method based on a Viterbi decoder. On the basis of realizing the Viterbi decoder based on FPGA and calculating the bit width of the register, it includes: selectively protecting the Viterbi decoder: SEU tolerance Register bits with a value of 0 adopt triple-mode protection: add two bits of redundant information to all bit positions at the same time, store the same information as the original bit position, and the final result is based on any two bits of the same bit information. Two-mode protection is performed on the bit position of the SEU fault-tolerant register: each bit adds a corresponding bit of redundant information, stores the same information as the original bit position, and then adds a logical AND gate, and the output result of the AND gate is The protected bit position final result.

Description

technical field [0001] The invention relates to a selective protection method based on a Viterbi decoder. Background technique [0002] Communications are a key element of space systems, especially satellites. In fact, in many cases, the main purpose of satellites is to provide communications for terrestrial services. Therefore, these satellites need to be able to have onboard processing of the received signals. This requires complex circuitry in many cases. For example, in order to achieve an acceptable bit error rate (BER) even at low signal-to-noise ratio (SNR), the signal at the transmitting end usually has some form of encoding, and errors are then corrected at the receiver. When convolutional coding is used at the transmitter, the receiver typically implements a Viterbi decoder to detect and correct errors. The decoder can be implemented in software running on the processor. However, in the space environment, there are radiation particles. When the space radiation...

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Problems solved by technology

On the other hand, under the same system resource limitation, if the TMR scheme is used, the overall processing capacity of the system will be reduced to one-third of the unprotected case, which will greatly limit the processing capacity and functional diversity of the space platform sex

In addition, in the traditional three-mode protection scheme, the overall behavior characteristics of the Viterbi decoder and its own fault tolerance are not fully utilized

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