Overlapped time division multiplexing modulation method, device and system

Abstract

An overlapping time-division multiplexing modulation method, device and system, which generates an initial envelope waveform with a smooth waveform in the time domain according to design parameters, and the initial envelope waveform is a Bartlett-Hanning envelope waveform or an envelope waveform of an evolution window function ; According to the overlapping multiplexing times, the initial envelope waveform is shifted in the time domain according to a predetermined shift interval to obtain the offset envelope waveform of the signal sent at each moment; the input digital signal sequence is converted into a positive and negative symbol sequence; The converted positive and negative sign sequence is multiplied by the envelope waveform of the transmitted signal at each time after each offset to obtain the modulated envelope waveform at each time; the modulated envelope waveform at each time is superimposed in the time domain to obtain the carried output The complex modulation envelope waveform of a signal sequence. Since the time domain waveform of the initial envelope waveform is relatively smooth and the frequency domain bandwidth is narrow, the superimposed waveform is smooth and limited to a narrow bandwidth, thus improving the spectrum utilization and transmission rate of the system and reducing the bit error rate of the system.

Description

technical field [0001] The invention relates to the communication field, in particular to an overlapping time-division multiplexing modulation method, a device and an overlapping time-division multiplexing system. Background technique [0002] The so-called time division (hereinafter referred to as time division multiplexing) (TDM: Time Division Multiplexing) is a technology in digital communication that allows multiple signal symbols occupying a narrower time duration to share a wider time duration. like figure 1 Shown is a schematic diagram of a conventional time-division multiplexing technique. [0003] figure 1 The time durations of the multiplexed signal symbols (referred to as time slot width in engineering) are T1, T2, T3, T4, ..., and they are usually allowed to occupy the same time slot width in engineering, and ΔT is The minimum guard time slot, the actual guard time slot width should be more generous. ΔT should be larger than the transition time width of the d...

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Problems solved by technology

[0007] The present invention provides an overlapping time division multiplexing modulation method, device and system, which solves the problem that when the initial envelope waveform has a wide bandwidth in the frequency domain, the waveform after overlapping time division multiplexing is relatively steep in the time domain and occupies a wide bandwidth in the frequency domain , which reduces the spectrum utilization and transmission rate of the entire system

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