A Method for Performance Enhancement for Aeronautical Telemetry Radio Link Using Alamouti Code

In the most aeronautical telemetry systems, at least two antennas are used to transmit radio signals towards receiver antenna. It is due to effect of large metallic fuselage of air vehicles in cutoff radio link between transmitter and receiver antenna during flight manoeuvres. Installation of two antennas on the fuselage of air vehicle guarantees a convenient and continuous link between telemetry transmitter and receiver antennas. But during some moments that receiver antenna receiver radio signals from two transmitter antenna simultaneously, there is phenomena named self-interference, one can overcome this problem through making independence between two transmitting signals. In this paper using one of the block codes named Alamouti one can assure independence of two transmitting signals from two transmitter antennas. Using this code in a radio link, variation of bit error rate probability in flight path reduced to some convenient values and quality of radio link will be increased.