Reusable Q-power demapping method and system based on DVB-S2 system

A DVB-S2 and demapping technology, which is applied in the transmission system, modulated carrier system, digital transmission system, etc., can solve the problems of long simulation time of demapping algorithm, high computational complexity, and degradation of bit error performance, etc., to reduce DSP The effect of resource consumption

Active Publication Date: 2021-09-17
NAT SPACE SCI CENT CAS
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  • Application Information

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Problems solved by technology

The simulation time of the demapping algorithm based on amplitude and phase is relatively long, and the calculation complexity is high; the proposed demapping algorithm based on amplitude is not suitable for 32APSK modulation, and the bit error performance decreases

Method used

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  • Reusable Q-power demapping method and system based on DVB-S2 system
  • Reusable Q-power demapping method and system based on DVB-S2 system
  • Reusable Q-power demapping method and system based on DVB-S2 system

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Embodiment 1

[0176] 1 QPDemapping Algorithm

[0177] In order to improve the bit error performance of the demapping algorithm and simplify the implementation structure of the algorithm, a Q-th power demapping algorithm is proposed. The algorithm stipulates the values ​​of the exponentiation order Q and the phase rotation angle β of different modulation signals as shown in Table 1. As shown in Figure 7(a), (b), (c) and (d), after different modulation methods are processed by the Q power operation, the constellation diagrams converge to a certain extent, and are converted into QPSK-like modulation constellation diagrams.

[0178] Table 1 Values ​​of exponentiation order Q and phase rotation angle β for different modulation signals

[0179]

[0180] Suppose the 16PSK modulated signal can be expressed as

[0181] r k =(Re k +j*Im k ) (8)

[0182] The signal after the third power operation can be expressed as

[0183] (r k ) 3 =(Re k +j*Im k ) 3 = Re k 3 +j*Im k 3 (9)

[01...

Embodiment 2

[0241] Embodiment 2 of the present invention proposes a reusable Q-power demapping system based on DVB-S2 system. This system includes: QPD algorithm phase offset compensation module, Q-power operation module, power detection module and symbol judgment module ; Wherein, the Q power operation module and the power detection module are reusable modules;

[0242] The QPD algorithm phase offset compensation module is used to perform QPD algorithm phase offset compensation on the signal of the received DVB-S2 system;

[0243] The Q-th power operation module is used to receive the signal of the DVB-S2 system and the modulation mode signal, determine the modulation type of the received signal according to the modulation mode signal, and perform the corresponding Q-th power operation on the received signal after the phase offset compensation of the QPD algorithm , where Q is an integer greater than or equal to 0, and the Q power operation is the Q power operation and the corresponding ...

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Abstract

The invention discloses a reusable Q-power demapping method and system based on a DVB-S2 system. The method comprises the steps of: receiving a signal of the DVB-S2 system and a modulation mode signal, determining the modulation type of the received signal according to the modulation mode signal, carrying out the corresponding Q-power operation of the received signal after the phase offset compensation of a QPD algorithm, then carrying out the power detection, and judging a circular ring on which a symbol is located according to a relation between a power detection value and a power judgment threshold value; and de-mapping the received signal according to the received signal, the signal after the Q power operation and the circular ring on which the decision symbol is located to obtain a corresponding constellation point bit. Under different modulation modes, the error code performance of an algorithm of the reusable Q-power demapping method is better than that of a de-mapping algorithm based on amplitude and phase and a de-mapping algorithm based on amplitude; the resource consumption is lower than that of other year-on-year algorithms; and reusability is achieved, DSP resource consumption can be reduced after multiplexing, and the method can be better applied to a DVB-S2 system.

Description

technical field [0001] The invention relates to the technical field of digital signal processing, in particular to a multiplexable Q-power demapping method and system based on the DVB-S2 system. Background technique [0002] With the further increase of information transmission demand and the further increase of data transmission rate, the space channel spectrum resources are becoming increasingly tight. Using QPSK (Quadrature Phase Shift Keying, Quadrature Phase Shift Keying, QPSK is the most commonly used satellite digital signal modulation method) .) brought about by a surge in bandwidth, low transmission efficiency and other issues have become increasingly prominent. Therefore, in the design of inter-satellite links, saving space channel spectrum resources is the primary issue. During the entire working process of the digital transmission link, with the increase of the antenna elevation angle, the communication distance is shortened, and the channel transmission loss be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/00H04B7/185
CPCH04L27/0012H04L27/0014H04B7/18521H04B7/18513H04L2027/0026Y02D30/70
Inventor 胡婉如王竹刚梅如如陈轩
Owner NAT SPACE SCI CENT CAS
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