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Adaptive virtual hybrid retransmission method applicable to satellite mobile communication system

A technology of satellite mobile communication and hybrid retransmission, which is applied in the direction of using the return channel for error prevention/detection, etc. It can solve the problems that hinder the timely and continuous exchange of channel quality parameters and detection signals, and cannot be directly applied to satellite communication systems, so as to improve reliability. sexual effect

Active Publication Date: 2012-10-17
SOUTHEAST UNIV
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Problems solved by technology

However, the large propagation delay characteristic of satellite links hinders the timely and continuous exchange of channel quality parameters and sounding signals between users and ground terminals
Therefore, neither traditional HARQ nor adaptive technology can be directly applied to satellite communication systems

Method used

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  • Adaptive virtual hybrid retransmission method applicable to satellite mobile communication system
  • Adaptive virtual hybrid retransmission method applicable to satellite mobile communication system
  • Adaptive virtual hybrid retransmission method applicable to satellite mobile communication system

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Embodiment Construction

[0012] An adaptive virtual hybrid retransmission method suitable for satellite mobile communication systems, comprising the following steps:

[0013] 1) According to the received pilot signal, the receiving end predicts and estimates the channel quality at the moment when the transmitting end signal is sent; jointly selects the coding and modulation method that can be transmitted correctly and has the highest rate and multiple redundant versions of the same coding block sent at one time, and puts The indication information of the selection result is fed back to the transmitter;

[0014] 2) The transmitting end calculates the transmission block length according to the selected coding modulation method and the equivalent code rate corresponding to the number of redundant versions of the coding block sent at one time, according to the number of available resource particles in a given time-frequency resource block, and completes channel coding and rate matching and modulation, the...

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Abstract

The invention discloses an adaptive virtual hybrid retransmission method applicable to a satellite mobile communication system. Firstly, a receiving end forecasts and estimates the channel quality during signal sending at a sending end according to a received pilot signal, jointly selects a correct transmission encoding and modulation mode with the maximum rate and a plurality of redundant versions of the same encoding block, which are sent at one time, and feeds back a selection result to the sending end; the sending end calculates the length of a transmission block on the basis of the number of available resource particles according to the selected encoding and modulation mode and an equivalent code rate corresponding to the number of the redundant versions of the encoding block, which are sent at one time, to finish channel encoding, rate matching and modulation; a channel adaptively sends one or more redundant versions at one time in a given time frequency resource block; and finally, the receiving end receives data, and then combines and decodes a plurality of possibly sent redundant versions according to a hybrid automatic repeat request (HARQ) decoding mode. By using the method, the reliability of a link is improved; and the method is applicable to the satellite mobile communication system which is large in transmission time delay and has a power limitation characteristic.

Description

technical field [0001] The present invention relates to link self-adaptation and hybrid retransmission mechanism, in particular to an adaptive virtual hybrid retransmission method (namely HARQ), which is an adaptive link method for improving the reliability of satellite mobile communication links. Background technique [0002] Compatibility with terrestrial mobile communication systems is the development trend of satellite mobile communication. Several innovative designs have been proposed to maximize the commonality of satellite and 4G terrestrial air interfaces. These designs are aimed at the particularity of satellite channels, such as nonlinear distortion caused by loaded power amplifiers, large transmission delay and time diversity reduction, etc., and make necessary modifications while ensuring other parts are compatible with ground solutions. Therefore, it is very important to highlight the difference in transmission models for mobile channels in terrestrial and sate...

Claims

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Application Information

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IPC IPC(8): H04L1/18H04L1/16
Inventor 黄永明金石赵晶晶刘青瞿培培王海明杨绿溪高西奇
Owner SOUTHEAST UNIV
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