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A Digital Communication Method Using Non-orthogonal Pulses

A communication method and non-orthogonal technology, applied in transmission systems, electrical components, etc., can solve problems such as signal waveform optimization design

Active Publication Date: 2018-11-27
中国人民解放军海军航空大学航空作战勤务学院
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

A comprehensive analysis of the current research status of non-orthogonal transmission methods shows that none of the existing methods optimizes the design of the signal waveform used, thereby improving the data transmission rate and spectrum efficiency of the communication system

Method used

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  • A Digital Communication Method Using Non-orthogonal Pulses
  • A Digital Communication Method Using Non-orthogonal Pulses
  • A Digital Communication Method Using Non-orthogonal Pulses

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] Embodiment 1: Construction of non-orthogonal PSWF pulse group

[0069] Design requirements: Design 16 non-orthogonal ellipsoidal wave (PSWF) pulse groups within the frequency range of 200kHz to 200.18kHz. The parameter settings of the pulse sets are shown in Table 1.

[0070] Table 1 PSWF pulse set parameter settings

[0071]

[0072] Specific implementation steps:

[0073] ①Divide channel B=180Hz into 4 sub-channels with the same bandwidth and overlapping 50% of each other, each sub-channel (sub-band) has the same bandwidth of 72Hz and interleaves with each other by 36Hz;

[0074] ② According to the channel division and the time-bandwidth product c=4π of the PSWF pulse, determine the duration of the PSWF pulse T=c / 2πB=27.78ms and the number of pulses in each sub-channel N=4;

[0075] ③In each channel, according to the spectrum range of each pulse [f l , f h ] and duration T, construct the integral equation shown in formula (15), carry out the discretization samp...

Embodiment 2

[0076] Embodiment 2: Selecting an appropriate non-orthogonal transmission pulse according to the reliability and effectiveness index of a certain communication system

[0077] Design requirements: the transmission frequency band is [50,60]MHz, the spectral efficiency is greater than 7bit / s / Hz, at BER=10 -5 E required in case b / N 0 ≤20dB, using non-orthogonal PSWF pulse group to transmit information;

[0078] The specific implementation process is as follows:

[0079] ① The four parameters of the non-orthogonal PSWF pulse group are: the number of sub-bands M, the spectral overlap λ of adjacent sub-bands, the number of pulses in a single sub-band N and the time-bandwidth product c of the pulses. The combination of these four parameters The feasible region of is 1≤M≤M max ,2≤c≤c max ,c≤N≤2c-2,λ min ≤λ≤λ max ,MNmax Among them, M and N are positive integers. According to the specific parameters of the given communication index, in order to reduce the search complexity, dete...

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Abstract

The invention discloses a digital communication method adopting non-orthogonal pulses. In the method, each communication code element signal is obtained by superposing non-orthogonal pulse time domains after multi-channel amplitude modulation, adjacent code element signals are not overlapped with each other on the time domains, the spectrums of the non-orthogonal pulse groups within one code element time are overlapped mutually, and a parameter combination of the non-orthogonal pulse groups is determined through a way of searching the parameter combination which has the minimum pulse number and meets a practical frequency band utilization rate of a communication system and a signal-to-noise ratio in the presence of a certain bit error rate within a feasible domain. The digital communication method adopting the non-orthogonal pulses has the advantages of high spectrum efficiency, wide scope of application and low peak-to-average power ratio of modulating signals.

Description

technical field [0001] The invention relates to a digital communication method, in particular to a digital communication method using non-orthogonal pulses. Background technique [0002] From the perspective of signal analysis and representation, the traditional view is that the orthogonality between transmission waveforms can well eliminate intersymbol interference, and the use of orthogonal sine-cosine pulses to transmit information also reduces the demodulation complexity at the receiving end. According to the Nyquist criterion, when an orthogonal function is used to transmit information, the limit symbol transmission rate is the Nyquist rate, and the digital information to be transmitted can be taken from the entire real number field. At present, high-efficiency modulation methods represented by quadrature amplitude modulation (QAM) and orthogonal frequency division multiplexing (OFDM) are typical representatives of this theoretical idea. However, orthogonality is a str...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B14/02
CPCH04B14/023
Inventor 刘锡国张丹陈昭男
Owner 中国人民解放军海军航空大学航空作战勤务学院
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