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Mobile satellite uplink adaptive coding and modulation method based on partial channel information

A technology of adaptive coding and modulation method, applied in the field of mobile satellite coding and modulation, which can solve problems such as limited range

Inactive Publication Date: 2018-09-18
NANCHANG HANGKONG UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in practical engineering applications, due to the limited precision of statistical information and the limitation of anti-delay performance, the scope of application of this method is also limited

Method used

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  • Mobile satellite uplink adaptive coding and modulation method based on partial channel information
  • Mobile satellite uplink adaptive coding and modulation method based on partial channel information
  • Mobile satellite uplink adaptive coding and modulation method based on partial channel information

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Embodiment Construction

[0021] In the mobile satellite communication system, it is assumed that the system works in the S frequency band, and the uplink and downlink adopt frequency division duplex (FDD, frequency division duplex) transmission mode; for the LMS communication system in this frequency band, the main influencing factors in the transmission channel Includes multipath and shadow fading. If the system adopts a high-order modulation and coding scheme (MCS, modulation and coding scheme), the system can obtain high spectral efficiency, but the ability to resist channel fading is poor. When the shadow fading of the link is strong, the system bit error rate cannot be achieved. Meet the requirements of the target bit error rate; if a low-order MCS is used, although the bit error rate of the system is guaranteed, the spectral efficiency of the system will be greatly reduced, resulting in a waste of channel resources. Therefore, it is necessary to use adaptive coding and modulation technology to a...

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Abstract

The invention provides a mobile satellite uplink adaptive coding and modulation method based on partial channel information. For realizing adaptive coding and modulation of ground terminals, a transmitter obtains equivalent uplink line of sight channel information through an open loop method according to reciprocity of mobile satellite uplink and downlink line of sight channel information, and bya closed-loop system, the transmitter obtains multi-path channel statistics information fed back by a receiving end. The invention also provides an optimal adaptive algorithm suitable for the mobile satellite uplink, wherein a ground end calculates an optimal switching threshold through an optimization algorithm based on the acquired partial channel information, and thus, adaptive switching of coding and modulation modes is realized. The method provided by the invention effectively overcomes boundedness of the existing mobile satellite adaptive method, avoids influence of channel information feedback delay on adaptive performance and guarantees implementation of reliable and efficient adaptive coding and modulation under a mobile satellite communication environment.

Description

technical field [0001] The invention relates to a mobile satellite coding and modulation method, in particular to a mobile satellite uplink adaptive coding and modulation method based on partial channel information. Background technique [0002] Satellite communication is an important part of wireless communication, and plays an important role in people's daily production and life, especially in the case where ground wireless communication cannot cover, such as mountainous areas, oceans or disaster areas after earthquakes, satellite communication can play an important role. to an important supplementary role. However, in the process of using satellite communication, its communication quality is affected by many factors such as weather fading, shadow fading and multipath effect, which makes the signal of satellite communication seriously fading and increases the complexity of satellite communication research; while mobile The introduction of satellite communication technolog...

Claims

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Application Information

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IPC IPC(8): H04L1/00H04B7/185H04L27/00
CPCH04B7/18582H04L1/0003H04L1/0009H04L27/0008H04B7/18513H04B7/18543
Inventor 韦亮宋高俊
Owner NANCHANG HANGKONG UNIVERSITY
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