S.V. Volvenko - Associate Professor, Department «Radio Engineering and Telecommunication Systems», Institute of Physics, Nanotechnology and Telecommunications of Peter The Great St.Petersburg Polytechnic University E-mail: volk@cee.spbstu.ru S.B. Makarov - Dr. Sc. (Eng.), Professor, Director of Institute of Physics, Nanotechnology and Telecommunications of Peter The Great St.Petersburg Polytechnic University E-mail: makarov@cee.spbstu.ru S.V. Zavjalov - Ph. D. (Eng.), Associate Professor, Department «Radio Engineering and Telecommunication Systems», Institute of Physics, Nanotechnology and Telecommunications of Peter The Great St.Petersburg Polytechnic University E-mail: zavyalov_sv@spbstu.ru B.M. Kchatchajantc - Part-programming Engineer, Department «Radio Engineering and Telecommunication Systems», Institute of Physics, Nanotechnology and Telecommunications of Peter The Great St.Petersburg Polytechnic University E-mail: tyler92@inbox.ru

The choice of the threshold signal-to-noise ratio in the meteor-burst communication channel for half-duplex protocol with ARQ is con-sidered in this paper. Periodic communication channel probe is used for detection of channel establishing. Application of FSK signals with noncoherent bit-by-bit detection algorithm is shown. Polar codes with symbol interleaver are used for improving BER performance. The model of the meteor-burst communication channel is considered. Half-duplex protocol specification with automatic repeat request (ARQ) is given in this article. It is shown that the checksum field must be placed at the beginning of the frame. It is show that usage of more redundant polar code (256, 204) can provide energy gain equal to 0.2 dB in comparison with polar code (1024, 896) for symbol error probability p = 10−3. The threshold signal-to-noise ratio can be reduced by application of block interleaver. The value of threshold signal-to-noise ratio reduction is equal to 1.5 dB for symbol error probability p = 10−3. It can be explained by error group deleting. Optimal values of threshold signal-to-noise ratio are equal to 1−5 dB for half-duplex protocol with ARQ. Packet error probability can be reduced by application large values of threshold signal-to-noise ratio. However, it leads to increase the time intervals between frame transmissions that will affect the delivery time. Interleaver application provide reduction of average number of retransmission by 50% for fixed polar code specification and for threshold signal-to-noise ratio equal to 4 dB. Number of retransmissions reduce with threshold signal-to-noise ratio increasing. This fact can explained by packet error probability reduction for threshold signal-to-noise ratio increasing. It is shown that optimal threshold signal-to-noise ratio is equal to 5−7 dB as compromise with average delivery time and number of retransmissions.

 

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