A Realization Method of Waveform Multiplexing Modem

Abstract

The invention relates to an implementation method of a waveform reuse modulator-demodulator, which comprises the following steps: utilizing the characteristic that odd harmonic component and even harmonic component are only provided with sine or cosine wave of the Fourier series of the odd harmonic function and the even harmonic function respectively, taking the cosine function wave, the odd harmonic function wave and the even harmonic function wave as the carrier wave respectively to carry out amplitude modulation to transmission signals, restoring the original signal through the coherent demodulation, and realizing the waveform reuse modulation-demodulation. The modulation-demodulation of 3n pathways of signals with n types of various carrier frequencies can be realized; the spectrum utilization rate is improved; the crosstalk rate between every two component channels is ensured to be low; meanwhile the transmission speed rate of the system is improved; the modulator-demodulator is improved on the basis of conventional modulation-demodulation; the transmission performance of the system is improved to a great extent.

Description

technical field [0001] The invention relates to a communication technology, in particular to a realization method of a waveform multiplexing modem. Background technique [0002] With the development of communication technology and the increasingly diverse needs of communication services, the transmission of a single signal can no longer meet the diverse needs. Therefore, it is very meaningful to study multiplexing technology, that is, to combine multiple signals into Transmission on one physical channel, realizing the function of transmitting multiple signals on one channel at the same time. [0003] Multiplexing is a method of combining several unrelated signals to transmit composite information on a shared channel. In the communication system, the signal multiplexing techniques are time division multiplexing (TDM), frequency division multiplexing (FDM), code division multiplexing (CDMA), wavelength division multiplexing (WDM), etc. Among them, the frequency division mult...

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Problems solved by technology

[0005] The present invention aims at the problem of low frequency spectrum utilization in the existing frequency division multiplexing technology, and proposes a method for realizing a waveform multiplexing modem, using the Fourier series of the odd harmonic function and the even harmonic function with only The characteristics of the odd harmonic component and the even harmonic component of the sine or cosine wave, the cosine function wave, the odd harmonic function wave and the even harmonic function wave are used as the carrier to modulate the amplitude of the transmission signal, and the coherent demodulation is used to restore The original signal realizes the modulation and demodulation of multi-waveform multiplexing, that is, it can realize the modulation and demodulation of 3n signals of n kinds of carrier frequencies, which improves the spectrum utilization rate and greatly improves the transmission performance of the system

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