Performance Limitation of STBC OFDM-CDMA Systems in Mobile Fading Channels

Abstract

AbstractOrthogonal frequency division multiplexing (OFDM) is sensitive to carrier frequency offset and channel estimation error, which destroy the subcarrier orthogonality and give rise to intercarrier interference (ICI). This paper addresses the performance degradation due to imperfect parameters in an orthogonal frequency and code division multiplexing (OFDM-CDMA) system with multiple transmit antennas. For the performance evaluation, the average bit error rate (BER) impairment due to imperfect channel information and frequency offset is investigated taking into account the effect of time-varying channels. Derived results show that a space-time block coded (STBC) OFDM-CDMA system experiences a severe BER degradation regardless of the number of users.KeywordsOrthogonal Frequency Division MultiplexInput Multiple OutputOrthogonal Frequency Division Multiplex SystemPilot SymbolMultiple Input Multiple OutputThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.