The effect of clock frequency offset on OFDM-CDMA systems

6 pagesRecently, Orthogonal Frequency and Code Division Multiplexing (OFCDM) access technology has been investigated for the next generation of mobile communication systems. A known drawback of these multi carrier systems is their sensitivity to synchronization errors, particularly to clock frequency offset. The contribution of this article is twofold. First, a generalized framework is proposed for modelling the effect of clock frequency offset on 2 dimensional spreading OFDM-CDMA systems. Then, exploiting some results from the random matrix theory, an analytic expression of the Signal to Interference and Noise Ratio (SINR), modeling the impact of clock frequency offset, is derived. This formula is independent from the actual values of the spreading codes while taking into account their orthogonality. This is the novelty of this article. This model works for frequency selective channels and any single user detector