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Dual-satellite diversity single-carrier transmission method with adaptive cyclic prefix

A cyclic prefix, single carrier technology, applied in the field of satellite communication systems, can solve the problems of increasing frame length, processing complexity, transmission delay synchronization improvement, and reducing system efficiency, etc., to reduce extra overhead, strong adaptive ability, and complex algorithm. low degree of effect

Inactive Publication Date: 2018-08-28
NO 61 INST OF GENERAL STAFF
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, increasing the frame length will lead to a synchronous increase in processing complexity and transmission delay
Furthermore, the time-varying distance between satellites makes the extra length of the cyclic prefix reduce the efficiency of the system for most of the time period

Method used

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  • Dual-satellite diversity single-carrier transmission method with adaptive cyclic prefix
  • Dual-satellite diversity single-carrier transmission method with adaptive cyclic prefix
  • Dual-satellite diversity single-carrier transmission method with adaptive cyclic prefix

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The transmission distance difference that needs to be compensated in a certain period of time (greater than 30min) between two satellite sending nodes is 0.96Km, when the transmission rate is 100Mbps, the required cyclic prefix length is 320, based on the adaptive cyclic prefix algorithm of the present invention The steps are:

[0038] (1) The sender sets the initial cyclic prefix length to CP=450, the step size to N=128, the statistical interval to 1s, the statistical parameter to the bit error rate BER, and the threshold value to 10 -6 ;

[0039] (2) When the BER in the i-th statistical interval is less than or equal to the threshold value, the receiving end feeds back 0 to the sending end, and the sending end reduces the CP according to the specified step size;

[0040] (3) When the BER in the i-th statistical interval is greater than the threshold value, the receiving end feeds back 1 to the sending end, and the sending end increases the CP according to the specifi...

Embodiment 2

[0046] Figure 5 An embodiment of the present invention is given, including two satellite sending nodes and one satellite ground receiving station located at 60 degrees north latitude, and the parameters of each satellite are shown in Table 2.

[0047] Table 2

[0048] parameter

Satellite 1

satellite 2

Semi-major axis (Km)

42164.2

42164.2

Eccentricity

0

0

Inclination (degrees)

2

5

ascending node right ascension (degrees)

100

100.1

Argument of perigee (degrees)

0

0

True anomaly (degrees)

0

90

Longitude Drift Rate

0

0

[0049] Figure 6 The mathematical model of the distance between the satellite ground receiving station and the satellite is given when a single satellite has an inclination angle, where O represents the center of the earth, U represents the user, and A, B, and C represent the satellites located above the equator and offset by an angle of θ from north ...

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Abstract

The invention relates to the field of satellite communication technologies and provides a binary diversity single-carrier transmission method based on a self-adaptive cyclic prefix. The method comprises the following steps that (1) a space segment provides information service forwarded based on processing through two co-orbital satellites, and a satellite receiver at an earth segment can synchronously receive signals of the two satellites to obtain space diversity gain; (2) inter-frame signal interference of a receiving end, which is brought by random perturbation of the satellites, is effectively resisted by utilizing a single-carrier transmission mechanism based on the cyclic prefix; (3) the satellite receiver carries out balancing and subsequent signal processing on the received signals, a specific statistical parameter is taken as an index, and the current length performance of the cyclic prefix is broadcasted to a satellite transmitting end in a manner of 1 bit; and (4) the satellite transmitting end adjusts the length of the cyclic prefix at the appointed step length according to feedback information. According to the method, when the satellite altitude is inaccurately known, lower complexity, low-speed feedback expenditure and higher transmission efficiency are achieved, and the signal diversity gain brought by binary transmission is obtained.

Description

technical field [0001] The invention relates to the technical field of satellite communication systems, in particular to a distributed satellite communication signal transmission method. Background technique [0002] Based on the distributed constellation network composed of multiple co-orbit and coordinated satellites, the inter-satellite coordinated transmission beamforming technology can be used to form a virtual distributed multi-antenna transmission system, thereby improving the power efficiency of the network while obtaining space diversity gain. However, the distributed coordinated transmission beamforming technology requires high timing and carrier synchronization between transmitting nodes. satellite 10 -7 The above high-stability frequency source can ensure a small inter-satellite carrier frequency difference, so that the system performance loss caused by the frequency difference can be ignored. However, if the time deviation of different satellite transmission s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/185H04L1/00
CPCH04B7/1851
Inventor 黄勤飞何元智于全林源韩寒
Owner NO 61 INST OF GENERAL STAFF
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