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Digital pulse shaping intermediate-frequency modulation method

A modulation method and digital pulse technology, applied in the field of satellite communication, can solve the problems of huge resource occupation, extremely large resource occupation, difficult to achieve, etc., and achieve the effects of simple and reliable method, saving resource occupation, and easy implementation.

Inactive Publication Date: 2016-04-06
10TH RES INST OF CETC
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Problems solved by technology

Since the passband cut-off frequency parameters in the shaping filter design are related to the signal sampling rate and symbol rate, theoretically speaking, a set of shaping filter coefficients will be corresponding to a specific symbol rate, which will cause a huge resource occupation. Difficult to implement, even if it is processed by approximating the rate segment, the resource occupation is huge

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  • Digital pulse shaping intermediate-frequency modulation method

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Embodiment Construction

[0011] refer to figure 1 . In the embodiment described below, the baseband digital signal is first mapped into I and Q two-branch signals through the constellation; the two-branch I and Q signals are respectively upsampled by L times through the upsampler, and the obtained rate is R s The oversampled signal is filtered by the shaping filter to complete the baseband spectrum shaping of the I and Q branches; then the direct frequency synthesizer DDS is introduced into the interpolation filter, and the sampling rate of the digital-to-analog converter DA is respectively Interpolate the I and Q branches to complete the conversion of the sampling rate; carry out digital intermediate frequency modulation on the combined I and Q signals and send them to the digital-to-analog converter DA to reconstruct them into analog signals; the analog signals are filtered out by analog bandpass filters The out-of-band spectrum, thus obtaining the modulated intermediate frequency modulation signal...

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Abstract

The invention puts forward a digital pulse shaping intermediate-frequency modulation method, and aims to provide a digital pulse shaping intermediate-frequency modulation method which has the characteristics of fixed filter coefficient, simple implementation, reliability and low resource consumption and can be applied to arbitrarily configurable symbol rate. The method is implemented through the following technical scheme: a baseband digital signal is constellation-mapped into I and Q branch signals; L-time up-sampling of the I and Q branch signals is carried out through an up-sampler, and an obtained over-sampling signal of which the rate is Rs is filtered by a shaping filter, thus completing baseband spectrum shaping of the I and Q branches; then, an interpolation filter is introduced into a direct digital synthesizer (DDS), and the I and Q branches are interpolated at DA sampling rate in the interpolation filter to complete sampling rate conversion; after digital intermediate-frequency modulation of the combined I and Q signal, the signal is sent to a digital-to-analog converter DA and reconstructed into an analog signal; and the out-band spectrum of the analog signal is filtered by an analog band-pass filter, and a shaped intermediate-frequency modulation signal is obtained.

Description

technical field [0001] The invention relates to a method for performing pulse-shaping intermediate-frequency modulation on baseband digital signals in the field of satellite communication for aircraft measurement and control, data transmission, and baseband digital signals. Background technique [0002] The transmission data stream symbol is a square wave signal, which has an infinitely wide spectrum after baseband modulation, and is directly digitally modulated to an intermediate frequency carrier, and transmitted in a wireless channel with limited bandwidth, which will cause interference to adjacent wireless channels. In actual engineering, there are generally two ways to deal with this. [0003] The first way is to use an analog band-pass filter to directly truncate and filter out-of-band components of the modulated IF signal. This truncation will cause certain spectrum loss, which is a kind of distorted transmission. If the transmission bandwidth of the modulated signa...

Claims

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Application Information

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IPC IPC(8): H04L27/26
CPCH04L27/2627H04L27/264
Inventor 蒋友邦
Owner 10TH RES INST OF CETC
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