Multicarrier transmission systems with spreading sequences in large delay spread channel

In multi-carrier transmission systems, MC-CDMA and MC-DS-CDMA have been proposed. However, when large delay spread is longer than guard interval (GI), the inter symbol interference (ISI) and inter carrier interference (ICI) are occurred. Their interferences cause the system performance deterioration. This paper treats MC-CDMA and MC-DS-CDMA with four kinds of orthogonal spreading sequence including even-shift orthogonal sequences (E-sequence) type zero correlation zone (E-ZCZ) code in large delay spread channel. Moreover, interleaving method is considered in MC-DS-CDMA. Finally, the bit error rate (BER) performance is evaluated by computer simulation.