Physical Layer Waveform Design And MAC Protocol Development Based SDR

With the rapid development of information technology,information technology is playing an increasingly important role in warfare.The form of warfare has also undergone fundamental changes.Large-scale battles of a single armament have become history.Now more emphasis is placed on multiple arms joint operations,precise positioning,precise strikes,and the generation of tactical data links have accelerated the integration of navy,army,air force,space,and electronic countermeasure,enabling the rapid transmission of battlefield information between various combat units,greatly improving the military's informatization level,and the MAC protocol is the key to the tactical data link,which greatly affects the performance of a tactical data link.TTNT is the next-generation tactical data link vigorously developed by the US military.The data link layer is based on SPMA.SPMA protocol supports multi-priority data transmission,and provides extremely low access delay and extremely high transmission success rate.First of all,this article introduces the characteristics of the TTNT,and elaborates the requirements of the TTNT for the MAC protocol,this thesis introduces the SPMA protocol,I introduced the characteristics of the SPMA protocol from the channel detection mechanism,the multi-priority sending decision mechanism,the packet encoding mechanism,the flow control mechanism,and then introduced the USRP architecture of the RF hardware platform used in this article,its main parameters,and the Gnuradio software radio development platform used with USRP,then I described how to use the platform for Software radio module development in detail.Then,usin Gnuradio to develop a physical layer transmitter and receiver based on Coded-Aloha.The transmitter mainly includes an encoding module,a time-hopping module,and an OFDM transmission module;the receiver mainly includes a decoding module,a receiving pool module,and an OFDM receiving module.Next,the connectivity and transmission rate of the transmitter and receiver were tested,then combining the transmitter and receiver to make a physical layer transceiver based Coded-Aloha that meets TTNT requirements,and testing the success rate of data packet transmission and the transceiver is under different load conditions to see if the physical layer meet SPMA required.Finally,proposing the SPMA protocol based on the linear regression forward prediction algorithm,using this algorithm to predict the channel load,thereby adjusting the transmission rate of each priority data packet,making the SPMA simulation protocol into a dynamic library,and combine with Gnuradio framework,So the SPMA module was developed on Gnuradio.Through the open interface,it was combined with the physical layer based on Coded-Aloha in Chapter 3.The actual SPMA experimental platform was built,and the performance of the prediction algorithm was tested on the platform.