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Impulse waveform modulation method based on multi-dimensional constellation diagram

A technology of pulse waveform and modulation method, which is applied in the field of pulse waveform modulation based on multidimensional constellation diagrams, and can solve problems affecting system performance and other issues

Inactive Publication Date: 2013-08-21
王红星
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For these two important issues that affect system performance, Sachhi et al. have not considered relevant considerations (Claudio Sacchi, Tommaso Rossi, Marina Ruggieri, et al. Efficient Waveform Design for High-Bit-Rate W-band Satellite Transmissions[J].IEEE Transactions on Aerospace and Electronic Systems, 2011, 47(2): 974-995)

Method used

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  • Impulse waveform modulation method based on multi-dimensional constellation diagram
  • Impulse waveform modulation method based on multi-dimensional constellation diagram
  • Impulse waveform modulation method based on multi-dimensional constellation diagram

Examples

Experimental program
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Effect test

Embodiment

[0102] Design requirements: In the frequency band of 18.25GHz to 20.25GHz, the data transmission of 4Gbit / s can be realized.

[0103] Design analysis: According to the design requirements, the frequency band utilization rate of the system is 2bit / s / Hz. Here, 4 orthogonal PSWF pulses are used to transmit information, and the duration of each pulse is 1ns. The design frequency band is divided into 2 spectrum overlapping 50 % Sub-frequency band, the time-bandwidth product c=2 of the pulse.

[0104] The specific implementation process is as follows:

[0105] ① Generate 4 orthogonal PSWF pulses according to the given pulse design parameters.

[0106] In the first sub-band [17.75GHz, 19.75GHz], use formula (4) to calculate the two PSWF pulses ψ with a duration of 1ns 1 (t) and ψ 2 (t); in the second sub-band [18.75GHz, 20.75GHz], use formula (4) to calculate the two PSWF pulse ψ of duration 1ns 3 (t) and ψ 4 (t). The obtained initial pulse group is P=[ψ 1 (t), ψ 2 (t), ψ3 (t...

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Abstract

The invention discloses an impulse waveform modulation method based on a multi-dimensional constellation diagram. The method enables modulation data to be mapped into points in the multi-dimensional constellation diagram and loaded on multi-channel orthogonal pulses, and all the multi-channel orthogonal pulses enter channels to be transmitted after being superimposed in a time domain. After a receiving end achieves synchronization, the multi-channel orthogonal pulses generated locally are used for respectively carrying out correlation with received signals, time domain orthogonality among the pulses is used for achieving modulation information separation of the orthogonal pulses, received constellation points are obtained, and received data are obtained through utilization of a maximum likelihood decision. Compared with a traditional two-dimensional constellation diagram modulation base on sine waves, under the conditions of identical bandwidth using efficiency and the identical error rate, the modulation method needs lower signal to noise ratio.

Description

technical field [0001] The invention relates to a pulse waveform modulation method, in particular to a pulse waveform modulation method based on a multidimensional constellation diagram. Background technique [0002] Satellite communication has a high frequency, which has the advantages of wide available frequency band and large communication capacity, but its propagation loss is serious, which is a typical power-limited channel. Satellite communication systems usually require their high-power amplifiers to work in the nonlinear saturation region to obtain higher power efficiency, which also brings nonlinear distortion. Suppressing the peak-to-average power ratio (Peak-to-Average Power Ratio, PAPR) of the modulated signal is an effective method to reduce nonlinear distortion. Therefore, for satellite communication, it is often necessary to comprehensively consider the power utilization rate and PAPR performance of its modulated signal. It is the key and an important develo...

Claims

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Application Information

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IPC IPC(8): H04L27/36H04B1/7176
Inventor 王红星陈昭男钟佩琳康家方赵志勇刘锡国
Owner 王红星
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