Orthogonal multi-carrier FH-CDMA scheme for frequency selective fading

As a way to improve frequency efficiency or user capacity in land mobile communication systems, we introduce and investigate orthogonal multi-carrier frequency hopping-code division multiple access (FH-CDMA). These improvements are achieved by combining orthogonal frequency division multiplexing (OFDM) with FH-CDMA, The theoretical analysis includes bit error rate (BER), required S/N. And maximum bit rate. A modified scheme allowing transmission power to be controlled according to the number of simultaneously accessing users is also discussed. This scheme improves BER performance for frequency selective fading when the number of simultaneously accessing users in a cellular zone is small