Chirp technique Based under Water Communication Systems

In this paper, by using the multi chirp rate signals the multi user communication is achieved in the underwater acoustic systems. In general, the time, frequency is assigned for the single users for the communication systems like TDMA (Time division multiple access), CDMA (Code division multiple access) and FDMA (Frequency division multiple access). In proposed work, the multi chirp rate is assigned for the multi users for the marine systems. By using FFT (Fractional Fast Fourier Transform), the multi chirp rate signals are separated. Inter symbol interference (ISI) is caused by the multi patch is improved by the Virtual Time Reverse Mirror (VTRM).