Analysis of FHSS-CDMA with QAM-64 over AWGN and Fading Channels
نویسنده
چکیده
Assistant Professor, Dept. of ECE, JNNCE, Shivamogga, Karnataka, India ---------------------------------------------------------------------***--------------------------------------------------------------------Abstract – CDMA is a type of channel access method in which users using the same channel will use the same frequency band and also can access the channel at the same time. Using CDMA, more users can be allocated in the channel compared to TDMA and FDMA. CDMA can be achieved using Direct sequence spread spectrum(DSSS) and Frequency hopping spread spectrum(FHSS). FHSS-CDMA consumes less power compared to DSSS-CDMA. High data rate modulation schemes are used along with FHSS-CDMA to deliver high quality multimedia content. High data rate modulation techniques have good bandwidth efficiency in FHSS-CDMA. In wireless communication, QAM is one of the most commonly used modulation technique. Due to noise and interference, high data rate modulation techniques are prone to errors. FHSS-CDMA with QAM-64 is simulated over AWGN , Rician and Rayleigh fading channels using MATLAB 10 version. It is observed from the simulation that, Rician fading channel gives less bit errors compared to Rayleigh fading channel due to line of sight communication.
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