Redundant-coding-based multi-channel access method for satellite network communication
A technology of redundant coding and multiple access, which is applied in the field of satellite communication, can solve problems such as reducing network throughput, unfavorable energy balance, and increasing message transmission delay, so as to reduce the amount of transmitted data, improve access reliability, The effect of low resource utilization
Inactive Publication Date: 2013-03-13
NANJING UNIV OF POSTS & TELECOMM
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However, the retransmission method concentrates all data traffic on one path, which is not conducive to energy balance; node failure has a greater impact on a single path, so the robustness of multipath is stronger; in addition, retransmission increases channel competition , when congestion occurs, if the scheduling is improper, not only the expected reliability will not be achieved, but the congestion will continue to worsen, resulting in a large number of packets being discarded and reducing the network throughput
In addition, each hop retransmission will increase the transmission delay of the message, and many emergencies are delay sensitive
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[0036] For ease of description, we take figure 2 The scene in the middle is an example, the terminal is an aircraft, and the access star is a satellite directly connected to the aircraft. There are two links between the terminal and the access star, one is the link directly connecting the terminal to the access star, and the other is the link through the ground The station is connected to the access star. The terminal adopts the deletion convolution code encoding method.
[0037] When the terminal communicates with the access star, follow the steps below:
[0038] Step 1: Set the tolerable bit error rate of the satellite link before the terminal accesses the satellite. The terminal encodes the original data to form a convolutional code, then deletes a specific position in the convolutional code to form a deleted convolutional code, and selects a suitable access star for communication.
[0039] Step 2: Periodically judge whether the bit error rate of the link is within the ...
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The invention relates to a redundant-coding-based multi-channel access method for satellite network communication. According to the redundant-coding-based multi-channel access method for satellite network communication, with the adoption of a redundant-coding-based multi-channel access manner, the bit error ratio of a satellite-earth link in satellite communication is effectively reduced, and the reliability of satellite communication is improved. A terminal in a system supports multimode communication and can access to a satellite through multiple heterogeneous links, two parts of data are formed in a manner that the data is encoded at the terminal, one part of the data is a coded sequence with a certain error correction capability, the other part of the data is redundant data used for improving the error correction capability, one link is selected to transmit the coded sequence, and the other links are used for transmitting the redundant data, so that compared with condition that the same data is transmitted by multiple paths in traditional multi-path parallel transmission, the data transmission amount is effectively reduced, and the effective throughput of users is increased.
Description
technical field [0001] The invention relates to a method for a terminal to access a satellite, which is mainly used to resist the high bit error characteristics of the satellite-ground link and improve the communication reliability of the satellite-ground link, and belongs to the technical field of satellite communication. Background technique [0002] Satellite links are divided into interstellar links and satellite-ground links. The interstellar link is mainly based on free space propagation loss, and the bit error obeys the Gaussian distribution. The fading environment of the satellite-ground link is more complicated, and the influencing factors include: multipath fading, Shadow shading and Ka-band unique rain attenuation effects, etc. The characteristics of satellite links include: long delay, high bit error rate and asymmetry between uplink and downlink. Among them, a high bit error rate (BER) affects the reliability of the satellite link. Forward error correction (FE...
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IPC IPC(8): H04L1/00H04L1/16
Inventor 叶晓国胡涛孙力娟肖甫周剑王汝传郭剑韩崇
Owner NANJING UNIV OF POSTS & TELECOMM
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