Adaptive system and method of super-Nyquist based on superposition coded modulation

A technology of superposition coding modulation and adaptive transmission, which is applied in the field of communication, can solve problems such as high complexity, energy consumption, and waste of spectrum resources, and achieve the goal of reducing simulation workload, reducing design complexity, and avoiding the problem of code rate compatibility Effect

Active Publication Date: 2019-01-04
XIDIAN UNIV +1
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Problems solved by technology

[0006] With the demand for high spectrum efficiency in the development of communication, the traditional adaptive coding and modulation technology needs to reduce the code rate as much as possible while increasing the modulation order, but the low code rate will cause waste of spectrum resources to a certain extent, and the high The number also brings higher complexity and energy consumption
In addition, the traditional adaptive coding and modulation technology mainly adjusts the code rate and modulation order, which also has certain limitations.

Method used

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  • Adaptive system and method of super-Nyquist based on superposition coded modulation
  • Adaptive system and method of super-Nyquist based on superposition coded modulation
  • Adaptive system and method of super-Nyquist based on superposition coded modulation

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Embodiment 1

[0027] The traditional adaptive coding and modulation system mainly realizes the adaptive transmission of the system by adjusting the code rate and the modulation order. However, when the code rate changes, the encoding method of the sending end and the decoding method of the receiving end must be changed accordingly, which puts forward higher requirements for code design and hardware code rate compatibility. At the same time, the sending end and the receiving end Both need to store the generation matrix corresponding to each code, which brings greater storage capacity and difficulty for hardware implementation. In addition, with the growth of wireless communication services, higher-order modulation is required to meet higher spectral efficiency requirements. However, when the modulation order increases, the transmitter often requires a higher signal-to-noise ratio to achieve bit error rate requirements, which leads to higher transmission power required by the sender, which al...

Embodiment 2

[0031] The overall composition of the super-Nyquist adaptive transmission system based on superposition coding modulation is the same as that in embodiment 1, and the number of layers K and super-Nyquist acceleration factor τ of multiple groups of optional superposition coding modulation in the present invention Each combination in the combination form (K, τ) is formed by a combination of a layer number K and an acceleration factor τ. Any combination in multiple groups is different, but all of them need to satisfy K≥1, 0< τ<1, and the requirements of spectrum efficiency range and spectrum efficiency granularity. Calculate and obtain the combination (K, τ) of the preliminary layer number K of superposition coding modulation and the super-Nyquist acceleration factor τ, which is based on the calculation of the spectral efficiency of the super-Nyquist adaptive transmission system based on superposition coding modulation The formula and its required spectral efficiency range requir...

Embodiment 3

[0033] The present invention is also a super Nyquist adaptive transmission method based on superposition coding modulation, which is implemented on the above-mentioned super Nyquist adaptive transmission system based on superposition coding modulation, and the system includes superposition coding modulation at the sending end module and a super-Nyquist modulation module, as well as a matched filter and a super-Nyquist detection and decoding module at the receiving end. see figure 2 , the present invention realizes the adaptive coding and modulation of the super-Nyquist system by increasing or reducing the number of layers of the superposition coding and modulation module and changing the acceleration factor of the super-Nyquist modulation module, including the following steps:

[0034] (1) Determine the coding method and modulation method: choose a channel coding method suitable for the super-Nyquist system, such as Turbo code, and choose the simplest modulation method binary...

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Abstract

The invention discloses a super Nyquist adaptive system and a super Nyquist adaptive method based on the superposition coding modulation, which solves the problems of code rate compatibility and highcomplexity caused by high-order modulation and multiple code rates in prior art. The invention realizes adaptive coded modulation by changing the number of layers of a superposition coded modulation module and the acceleration factor of a Nyquist modulation module. The steps of the method are as follows: determining the coding and modulation mode; obtaining a preliminary transmission scheme combination; simulating a single-layer super-Nyquist signal for obtaining a signal-to-noise ratio; performing primary selection of an initial transmission scheme combination; simulating and determining thefinal combination of multiple transmission schemes available for selection; and realizing adaptive transmission in communication. As that transmission scheme is screened for the first time according to the theoretical signal-to-noise ratio, the simulation workload is reduced and the efficiency is improved. The adaptive system and the method support a large spectrum efficiency range and meet the requirement of the communication on the spectrum efficiency. The adaptive system and the method have low complexity and high flexibility, and are used in the wireless communication system such as the ground and the satellite.

Description

technical field [0001] The invention belongs to the field of communication technology, and further relates to the adaptive transmission of the super Nyquist system, in particular to a super Nyquist adaptive system and method based on superposition code modulation, which can be used for ground, satellite and other wireless communications system. Background technique [0002] With the development of wireless communication technology, users' demand for wireless communication services has shifted from a single low-speed voice service to various multimedia services. Future wireless communication systems are also more inclined to high spectrum utilization and high-speed data transmission. However, the actual wireless communication channel is a time-varying fading channel. According to the Shannon channel capacity formula, in a certain frequency spectrum, the channel capacity depends on the channel characteristics (fading, noise and interference, etc.). The state of the channel ad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04B17/336
CPCH04L1/0002H04L1/0006H04L1/0009H04B17/336
Inventor 白宝明刘孟孟王杨李双洋李倩
Owner XIDIAN UNIV
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