Overlapped time division multiplexing modulation method, device and system
An overlapping time-division multiplexing and modulation method technology, applied in the field of communication, can solve the problems of wide occupied bandwidth in frequency domain, steep waveform in time domain, reducing system spectrum utilization rate and transmission rate, etc., so as to reduce bit error rate and improve spectrum utilization The effect of rate and transfer rate
Inactive Publication Date: 2017-06-30
SHEN ZHEN KUANG CHI HEZHONG TECH LTD
View PDF1 Cites 1 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
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
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0046] The present invention will be further described in detail below through specific embodiments in conjunction with the accompanying drawings.
[0047] In the research on overlapping time-division multiplexing technology, the inventors found that the increase of transmission power is mainly related to the frequency spectrum of the multiplexed signal (ie, the modulation window function), rather than the shape and bandwidth of the multiplexed signal spectrum as theoretically assumed. any request. Although there are many window functions in the prior art, various window functions can be freely used to modulate the transmission symbols in theory, but because the rectangular window is easier to generate, design and apply than other window functions, and the cost is lower, so At present, the rectangular window is preferred for signal modulation, and the spectral bandwidth of the rectangular wave is wide, and the performance of the multiplexing waveform system is poor, resulting ...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More 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 Tukey envelop waveform or the envelop waveform of an evolution window function of a Tukey 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 narrow in frequency domain bandwidth, and the overlapped waveform is 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. Such as 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 th...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): H04L5/22
CPCH04L5/22
Inventor 不公告发明人
Owner SHEN ZHEN KUANG CHI HEZHONG TECH LTD