期刊名称：International Journal of Electronics and Computer Science Engineering
电子版ISSN：2277-1956
出版年度：2012
卷号：1
期号：2
页码：384-392
出版社：Buldanshahr : IJECSE
摘要：CDMA (code division multiple access), OFDM (orthogonal frequency division multiplexing) and UWB (ultra wide band) are t h e most developing technologies in mo dern 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 o f 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, w ith its ability to penetrate through materials and resolve multipath with path length differences on the order of a foot or less. Hence, a performance co mparison of these systems in multipath fading and additive white Gaussian noise (AWGN) channels is presented. The comparison proceeds in tw o steps. First, we design these systems with the same bandw idth. Second, a binary modulating signal w ith 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
