BER Analysis of CDMA, OFDM & UVW System Using SIMULINK

CDMA (code division multiple access), OFDM (orthogonal frequency division multiplexing) and UWB (ultra wide band) are t h e most developing technologies in modern mobile communication. OFDM is a parallel transmission scheme, where a high – rate serial data stream is split up into a set of low – rate sub streams, each of which is modulated on a separate subcarrier. Increasing the number of parallel transmission reduces the data rate that each individual carrier must convey and that lengthens the symbol period. Most third generation mobile communication systems are using CDMA as their modulation technique. Prior to the recent industry boom, the most common UWB system implementation is impulse radio, where ultra-short baseband pulses are used with a variety of modulation schemes to transfer data. Impulse radio has various advantages over OFDM, with its ability to penetrate through materials and resolve multipath with path length differences on the order of a foot or less. Hence, a performance comparison of these systems in multipath fading and additive white Gaussian noise (AWGN) channels is presented. The comparison proceeds in two steps. First, we design these systems with the same bandwidth. Second, a binary modulating signal with same bit rate is transmitted over these systems and the BER (bit error rate) in multipath fading and additive white Gaussian noise channels is observed.