A Short Burst Transmission Method Applicable to Satellite Communications at Low Signal-to-Noise Ratio
A technology with low signal-to-noise ratio and transmission method, applied in the field of satellite communication, can solve the problems of prolonged burst transmission time of pilot signals, long-term pilot signals, and less information, and achieve shortened transmission time and signal-to-noise ratio threshold. Low, low transmit power effect
Active Publication Date: 2020-06-19
NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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[0004] Short burst transmission under extremely low SNR is facing serious difficulties: First, the amount of information in short bursts is small, that is, the code blocks are short, and the performance of conventional Turbo or LDPC codes is poor; secondly, under low SNR, it is necessary to The receiver can do time, frequency and phase synchronization only when the pilot signal takes a long time
But a longer pilot signal will prolong the burst transmission time
Method used
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[0021] Below, combine Figure 1 to Figure 3 The present invention is further described.
[0022] A kind of short burst transmission method under the low SNR that is applicable to satellite communication, it is characterized in that comprising the following steps:
[0023] (1) Perform Turbo encoding of 1 / 5 code rate on externally input data;
[0024] The general structure of the encoder can be found in figure 2 . The Turbo code encoder consists of two component encoders and an interleaver. For the structure of two component encoders see image 3 . When encoding, the input information code block X k First send it to component encoder 1 to get the check code block Y 10 , Y 11 , then the information code block X k After being passed through the interleaver, it is sent to the component encoder 2 to obtain the check code block Y 20 , Y 21 . Finally, set the inputs of the first and second component encoders to the respective outputs of the component encoders, input 3 fee...
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The invention discloses a method suitable for short burst transmission in a satellite communication system. It involves the emergency life-saving communication system in the low signal-to-noise ratio environment in the field of satellite communication. It adopts very low code rate Turbo coding and spread spectrum to reduce the requirement of signal-to-noise ratio; and uses parallel triangular wave pilot frequency for time, frequency and phase synchronization. Aiming at the characteristics of less information to be transmitted for emergency lifesaving, short transmission time and low transmission power, the present invention adopts reasonable channel coding and pilot signals to optimize the comprehensive transmission performance of the system, and is especially suitable for satellite emergency lifesaving communication Return link use.
Description
technical field [0001] The invention relates to a short burst transmission method under low signal-to-noise ratio in the field of satellite communication, and is especially suitable for satellite anti-jamming and satellite emergency life-saving communication systems. Background technique [0002] Satellite anti-jamming communication or satellite emergency life-saving communication often adopts short burst transmission system. For anti-interference communication, the shorter the burst, the lower the probability of being intercepted and interfered, and the better the anti-interference effect. For emergency life-saving communications, the shorter the burst, the more convenient it is for the emergency sender to send, the smaller the probability of being interfered in the middle, and the higher the probability of successful emergency life-saving transmission. In order to adapt to short-burst transmission, emergency life-saving communication usually adopts code communication, and...
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Inventor 胡东伟王力权
Owner NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP