A time-delay multi-carrier modulation and demodulation method based on time-frequency pulse shaping

Abstract

The invention discloses a time-frequency pulse-shaping based time-delay multi-carriers modulation and demodulation method. The method is characterized in that a plurality of periodic symbol waveformscapable of carrying information are formed at a sending end; the symbol waveform is formed by H wavelets, a starting point of each wavelet is required to be placed in the lifetime of a first wavelet,and the symbol waveform is obtained by linear superposition after the starting points of the wavelets sequentially move from the starting point of the symbol waveform for a certain time period calleda time delay, wherein the wavelets refer to fundamental waves carrying the information, the fundamental waves comprise waveforms of three intervals, namely a front pulse information wave at an interval Tthetai1, a main wave without the information in an interval tthetai2 and a back pulse information wave in an interval Tthetai3; and the received symbol waveform is balanced, amplitude information of the information carried by the balanced symbol waveform is solved in each front and back pulse information wave interfaces in sequence, and then the amplitude information is converted into a binarynumber to complete a signal demodulation process at the receiving end. The method has the characteristics of higher transmission efficiency, lower demodulation complexity and the like.

Description

technical field [0001] The present invention relates to the modulation technique in the digital communication, specifically, relates to a kind of delay multi-carrier modulation and demodulation method based on time-frequency pulse shaping (referred to as TFP-TDMC——A Time-Frequency Pulse-Shaping BasedTime-Delay Multi -Carriers Modulation and Demodulation), which belongs to the technical field of multi-carrier modulation in digital communication. Background technique [0002] OFDM is the modulation technology in 4G and will also be in 5G mobile communication. The inventor once proposed a symbol waveform with a special structure and a corresponding modulation and demodulation method in the patent "Multi-carrier Modulation Method with Time-Frequency Mixing" (application number: 2008101194121), which was later called Time-shifted orthogonal multi-carrier modulation technique (referred to as NMT or TS-NMT). The inventors have proved from both theoretical and experimental aspects...

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Problems solved by technology

However, the demodulation complexity of TS-NMT is relatively high, and when the number of wavelets is large, the demodulation equations are more ill-conditioned. For this reason, the inventor proposed "A Modulation and Demodulation Method for Time-Delayed Multi-carriers", TDMC for short (patent application number: 2015100924095)

TDMC retains the characteristics of TS-NMT delay multi-carrier, and greatly simplifies the demodulation method on the basis of inheriting the advantages of TS-NMT's high transmission efficiency, but TDMC has the disadvantage of error propagation

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