Overlapped time division multiplexing modulation method, device and system

Abstract

The invention discloses an overlapped time division multiplexing modulation method, an overlapped time division multiplexing modulation device and an overlapped time division multiplexing modulation system. The method comprises the steps of generating an initial envelope waveform which is smooth within a time domain according to a design parameter, wherein the initial envelop waveform is the Hamming envelop waveform or the envelop waveform of an evolution window function of a Hamming window; shifting the initial envelop waveform at predetermined displacement intervals within the time domain according to an overlapped multiplexing time to acquire an offset envelop waveform of a sending signal at every moment; converting an input digital signal sequence into a plus-minus sign symbol sequence; multiplying the converted plus-minus sign symbol sequence by the offset envelop waveform of the sending signal at every moment to acquire the modulation envelop waveform of every moment; and overlapping the modulation envelop waveform of every moment in the time domain to acquire the complex modulation envelop waveform carrying an output signal sequence. The initial envelop waveform is relatively smooth in time domain waveform and relatively narrow in frequency domain bandwidth, and the overlapped waveform is relatively smooth and limited in the narrow bandwidth, so that a spectrum utilization rate and a transmission rate of a system are improved, and an error rate of the system is reduced.

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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