Hardware implementation method for GMSK modulation

A hardware implementation and data technology, applied in the field of signal processing, can solve problems such as research lag, and achieve the effects of low computational complexity, strong inter-symbol crosstalk, easy autocorrelation and power spectral density

Active Publication Date: 2020-11-20
10TH RES INST OF CETC
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

Due to its excellent spectrum characteristics, scholars from various countries have carried out various researches on it. At present, the research on the rel...

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  • Hardware implementation method for GMSK modulation
  • Hardware implementation method for GMSK modulation
  • Hardware implementation method for GMSK modulation

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Embodiment Construction

[0020] See figure 1 . According to the present invention, the data processor using Laurent expansion calculation sends the input information sequence to the differential encoder for differential, and performs bit differential precoding on the transmission bit stream; the serial-to-parallel converter performs serial-to-parallel conversion on the differential sequence, and The odd bits of the converted differential data are inverted to obtain the I and Q two-way orthogonal baseband data before filtering and shaping; the interpolation module and constellation mapping module based on the phase word calculation are based on different code rates and output digital-to-analog DA frequencies. I and Q two orthogonal data for symbol interpolation, and constellation mapping for the bit data obtained by symbol interpolation, the two bit mapping data corresponding to I and Q are respectively projected into a constellation point, based on Laurent decomposition The first pulse stream of the ph...

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Abstract

The invention provides a hardware implementation method for GMSK modulation, and aims to provide a method which is less in hardware resource consumption, convenient to expand and easy for hardware implementation. According to the technical scheme, the method comprises the following steps: sending an input information sequence into a differential encoder by a data processor for differential precoding, wherein the data processor is used for calculating according to Latent expansion; by a serial-to-parallel converter, performing serial-to-parallel conversion on the differentiated sequence, negating odd bits of the differential sequence subjected to serial-to-parallel conversion to obtain I and Q orthogonal baseband data before filtering forming corresponding to the pulse flow; by an interpolator, performing constellation mapping and shaping filtering on bit data obtained by symbol interpolation, reading a Gaussian minimum frequency shift keying (GMSK) filter coefficient prepared in advance from a ROM table; achieving convolution of the modulated data and data after constellation mapping through a multiplier, then multiplying carrier data in the ROM table by formed baseband data, and adding the I and Q modulated data to obtain final GMSK modulated signal data.

Description

Technical field [0001] The invention belongs to the technical field of signal processing, and relates to a GMSK hardware implementation method based on Laurent development. Background technique [0002] In modern communication systems, minimum Gaussian frequency shift keying GMSK is developed from minimum frequency shift keying MSK, which is an improved form of binary frequency shift keying. , Gaussian minimum frequency shift keying GMSK solves the problem of minimum frequency shift keying MSK that does not meet the high standards of out-of-band radiation. The GMSK signal has a narrow power spectrum and is especially suitable for transmission in narrow-band channels. It has little interference to adjacent channels and has good anti-interference performance. GMSK is a kind of minimum frequency shift keying, and it is also a continuous phase constant envelope modulation. It has the characteristics of small out-of-band radiation and high spectrum utilization, and has been widely us...

Claims

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Application Information

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IPC IPC(8): H04L1/00H04L27/12H04L27/34H04L27/36
CPCH04L27/12H04L27/3405H04L27/362H04L1/0002H04L1/0043
Inventor 朱胜利王宇舟张庭兰张波唐婷方科
Owner 10TH RES INST OF CETC
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