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A fpga-based ultra-high-speed apsk modulation method and modulation system

A modulation method and ultra-high-speed technology, applied in the direction of phase modulation carrier system, etc., can solve the problems that APSK modulation cannot achieve fast modulation, and the APSK modulation resource occupies a lot, and achieve the effect of convenient platform expansion, low hardware cost, and simple method.

Active Publication Date: 2018-03-27
SHANGHAI SPACEFLIGHT ELECTRONICS & COMM EQUIP RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a FPGA-based ultra-high-speed APSK modulation method and modulation system to solve the problem that the existing APSK modulation cannot realize fast modulation
[0010] Another object of the present invention is to provide a FPGA-based ultra-high-speed APSK modulation method and modulation system to solve the problem that existing APSK modulation resources take too much

Method used

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  • A fpga-based ultra-high-speed apsk modulation method and modulation system
  • A fpga-based ultra-high-speed apsk modulation method and modulation system
  • A fpga-based ultra-high-speed apsk modulation method and modulation system

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Embodiment 1

[0044] In this embodiment, a 32APSK constellation diagram is used for modulation mapping.

[0045] Step (1): APSK mapping and shaping filtering

[0046] First, input data in parallel and perform APSK mapping. Divide the parallel data input to the FPGA APSK mapping module into a group of 5 bits, and each group of data is in accordance with figure 1 The constellation diagram shown is mapped to a symbol on the constellation diagram, and several sets of data are mapped to several symbols. The amplitude of the symbols after 32APSK mapping has 17 levels (that is, the constellation points of the I and Q branches correspond to 17 types. Different amplitude values). The APSK modulation and shaping filter RAM stores the APSK constellation mapping table, and the input data bits are mapped into symbols according to the APSK constellation mapping table.

[0047] The symbol sequence after the data bit sequence mapping is sampled. Since the modulation of the present invention adopts a digital met...

Embodiment 2

[0068] This embodiment is the same as the first embodiment except for the following parts which are different from the first embodiment. The different parts are specifically: in step (1), if the data input in parallel is m bits per group, the m Each bit of data is mapped to a symbol on the M-order APSK constellation diagram, where M=2 m . The constellation diagram of the M-order APSK can be a uniform APSK constellation map or a non-uniform APSK constellation map. If the sampling frequency is greater than 2 times the Nyquist sampling frequency, if other frequencies are n times the sampling frequency, the superposition shall be carried out according to the following rules. When the decomposition mapping symbol sequence of the first layer of adjacent symbols is superimposed, the j+1 The decomposition mapping sequence of the symbol is backward by n bits compared to the decomposition mapping sequence of the j-th symbol and then added to obtain K+n values. When the second layer is su...

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Abstract

The invention discloses an FPGA (Field Programmable Gate Array)-based ultrahigh-speed APSK (Amplitude Phase Shift Keying) modulation method and a modulation system. In an APSK modulation and shaping filter mapping RAM (Random Access Memory) in an FPGA chip, a parallel digital single symbol mapping and multi-pulse overlap-add technology is adopted, the mapping and shaping filter of APSK are realized by adopting a one-step mapping way, a carrier signal is simplified into a discrete periodic sequence, and the discrete periodic sequence is loaded with a mapped signal to finish quadrature carrier modulation, so that a modulated APSK signal can be output. By adopting the method and the system disclosed by the invention, the resource occupation rates of a multiplier and an ROM (Read Only Memory) used in the conventional APSK modulation and shaping filter algorithm are lowered greatly, and a modulating way can be set flexibly. By adopting the method and the system, the problems of difficulty in realizing ultrahigh-speed modulation, high synthesizing difficulty, high circuit complexity, poor flexibility and the like in PSK modulation are solved, and the beneficial effects of simple implementation circuit design, low resource occupation and high flexibility are achieved.

Description

Technical field [0001] The invention relates to the technical field of digital signal modulation, in particular to an ultra-high-speed APSK modulation method and a modulation system based on FPGA. Background technique [0002] With the development of the military, political, and economic situation in the international community, the requirements for satellite earth observation load are getting higher and higher, with the characteristics of all-weather, all-weather, high-resolution, wide observation band, and short revisit time. Therefore, The amount of on-board remote sensing data and data bandwidth have increased sharply, and a higher rate and large-capacity data transmission system is required to complete the real-time processing and transmission of remote sensing data. The data transmission of a large amount of data has brought about a substantial increase in the frequency band, therefore, higher requirements are put forward on the signal modulation technology. [0003] The tra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/20
Inventor 向前李惠媛杨津浦
Owner SHANGHAI SPACEFLIGHT ELECTRONICS & COMM EQUIP RES INST