A airplane based communication and position finding method for receiving in a transceiver a OFDM signal from a mobile unit in an airplane. Demodulating and processing an OFDM received signal into a processed OFDM signal and processing and modulating the processed OFDM signal into a processed modulated signal. Transmitting in the airplane based transceiver the modulated signal to a satellite receiver. Receiving in the airplane based transceiver a second modulated signal from a satellite transmitter, demodulating and processing the second modulated signal into a processed second OFDM signal and modulating and transmitting said processed second OFDM signal to mobile unit. Method for processing an input voice signal, in a mobile unit, into a processed cross-correlated CDMA signal, modulating and transmitting cross-correlated CDMA signal into a modulated transmitted CDMA signal, used in a cellular system.