Frequency hopping anti-interference method based on error correction and erasure correction RS-Turbo concatenated codes

Abstract

The invention discloses a frequency hopping anti-interference method based on error correction and erasure correction RS-Turbo concatenated codes. The method mainly solves the problem that an existing frequency hopping communication system cannot conduct communication normally under the interference of carrier frequency deviation and partial bands. The method includes the steps that (1) RS coding is conducted on a frame of data; (2) each code element of an RS code is distributed onto a corresponding hop; (3) Trubo coding is conducted on each hop of data; (4) a frequency hopping framing format is set, and QPSK modulation is conducted; (5) carrier frequency deviation, phase deviation and Gaussian white noise are added in modulating signals, and complex base-band signals are obtained; (6) carrier synchronization is conducted on the complex base-band signals; (7) Turbo decoding is conducted on synchronous signals, and a deletion digit of the RS code is provided; (8) error correction and erasure correction decoding is conducted according to the deletion digit of the RS code. The method has the advantages of being good in error bit ratio and high in anti-interference performance and can be applied to mobile communications, satellite communications, deep space communications and remote metering.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a frequency hopping anti-jamming method, which can be used in mobile communication, satellite communication, deep space communication and telemetry. Background technique [0002] "Frequency hopping" is a communication method in which both parties of the communication send and receive synchronously change the carrier frequency to transmit information, and it is one of the most commonly used spread spectrum communication methods. Compared with fixed-frequency or frequency-selective communication, frequency hopping technology mainly relies on frequency agility to avoid narrow-band interference or track interference, thereby improving the anti-interference ability of equipment. Due to its superior performance in communication concealment and increasing equipment interference tolerance, frequency hopping communication is regarded as an important means of wireless com...

AI Technical Summary

Problems solved by technology

However, in this method, the RS code cannot use the soft information of the Turbo code, and can only perform hard-decision decoding, which will cause information loss. At the same time, the hard-decision RS code cannot achieve its maximum erasure correction capability.

For slow frequency hopping, multiple symbols are transmitted on the frequency of each hop. Once the hopping frequency is interfered, all the multiple symbols carried by the frequency will be wrong. If there is carrier frequency offset and frequency point blocking Under interference, the number of errors after Turbo decoding may exceed the error correction capability of the RS code, which will cause a large number of bit errors, resulting in a decline in the anti-interference performance of RS-Turbo

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