DVB-S2X Based High Throughput Data Transmission Techniques For Unmanned Aerial Vehicular

The UAV swarm is an important application and development of small UAVs.The swarm is formed by a large number of small UAVs,which cooperates with each other to form a high overall efficiency.The swarm can accomplish tasks such as enemy reconnaissance and air strike defense.In reconnaissance task,the UAV swarm acquires high-definition image information and transmits it back to the command center,which puts higher requirements on the data transmission link.High-throughput data transmission technology has become an urgent problem to be solved.This paper proposes a low-cost and high-throughput data transmission and reception system in UAV swarm based on DVB-S2 X standard.Focusing on this research goal,the key technical issues studied in this paper include:1.Principle and implementation of DVB-S2 X data transmitter.This paper studies the framework of DVB-S2 X system,analyzes the principle of code modulation and its implementation algorithm.The BCH code is constructed by using generator polynomial,LDPC code is derived according to the sparse check matrix,and the constellation mapping principle,shaping filtering and quadrature modulation are studied in detail,and the specification of DVB-S2 X standard is transformed into an algorithm that can be realized in engineering.2.DVB-S2 X signal demodulation technology and decoding technology.This paper designs a DVB-S2 X receiving system,focusing on the BCH and LDPC check error correction principle.The process of decoding LDPC with LLR BP algorithm is deduced,and the process of BCH decoding with BM iterative decoding algorithm is calculated.Based on the current LLR soft decision method,a demapping algorithm suitable for all constellations is proposed.3.Performance analysis of DVB-S2 X high-throughput data transmission system.The experiment results show that under the same channel condition,the same modulation mode has similar transmission error rate at different code rates,and the lower the order modulation mode,the lower the bit error rate.The lower the code rate of the codec,the stronger the error correction capability;the higher the code rate,the weaker the error correction capability.The interleaving technique can improve the error correction capability of the transmission system and reduce the bit error rate in the case of sudden interference.