Under the environment being reconfigurable by carrier frequency,modulation schemes,channel models and so on according to request,the simulation result shows that not only the receiver but also the transmitter perform well aimed at AM,SSB,FM,OOK,PSK,QPSK,MSK,FSK,and 16QAM.
In this paper we have synthetically introduced a wide applicable important system in error control technique, i. e. automatic repeat-request (ARQ) scheme with its fundamental principles, types, performance analysis, applications and developments. We have also introduced with emphasis the new achievement of the hybrid-type ARQ, the significance of which begins to attract our increasing attention.
The error control method——Stop-and-Wait Automatic.Repeat Request(SWARQ)of the 1553Bdata bas system is analyzed.By meas of the anal yzedresult the transmition reliability of the system can be estimated.
This paper gives the performance analysis about throughput and delay time for PMPS with the reservation S-ALOHA protocol.The results show that the probability of collisions of reservation requests and delay time are small in normal case and that the PMPS can fall into an unstable state with the delay drastically increased and system performance rapidly reduced when channel throughput is more than 36.7%.A modified random-request demand-assigned multiple access protocol(window protocol)is suggeste...