A method for transmitting a binary frequency shift keying signal

Abstract

A method for transmitting a binary frequency shift keying signal comprises the steps of grouping the conventional 2FSK signals, converting each grouping signal into a new grouping signal comprising two consecutive zero signals and six 2FSK signals according to a specific mapping relationship, and then interleaving the new grouping signal through a channel and transmitting the new grouping signal to a communication channel; After receiving the signal, at first, interleaving the receive signal through an inverse channel and then demodulating by signal grouping, When demodulating the signal subsequence, judging the position of the zero signal in each packet signal based on the energy of the signal, and then obtaining the analysis results of the other six FSK signals according to the inverse mapping relation,the analysis results of the eight received signals forming the decoding subsequence, and all the decoding subsequences forming the transmitted signals. By improving the transmission mechanism, the invention can obtain lower transmission error rate performance than the traditional 2FSK modulation method under the condition of the same information transmission rate.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to an improved transmission method of a binary frequency shift keying signal. Background technique [0002] M-order frequency shift keying (M-Frequency Shift Keying, referred to as M-FSK) uses the frequency change of the carrier to transmit digital information. It is a digital modulation that uses the discrete value characteristics of the baseband digital signal to key the carrier frequency to transmit information. technology. FSK modulation has been widely used in medium and low-speed data transmission because of its relatively simple engineering implementation and good performance in anti-noise and anti-attenuation. Among them, the more commonly used is the dual-frequency FSK system in which two frequencies carry binary 1s and 0s, that is, binary frequency shift keying (2FSK for short) transmission technology. [0003] In the transmission time of one signal chi...

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Problems solved by technology

[0006] Due to the power limitation of the digital communication system, when the channel transmission conditions are bad, even if the sending end adopts the lowest-order 2FSK modulation technology with the best performance, the error rate of the information transmission process may still be higher than the requirements of the communication system, which cannot be guaranteed. good signal transmission performance

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