DMWTCS BASED STBC-MC-DS-CDMA in Fast-Fading Multipath Channel

Wireless digital communications is rapidly expanding resulting in a demand for systems that are reliable and have a high spectral efficiency, to fulfill these demands, the Multicarrier modulation scheme, often called Orthogonal Frequency Division Multiplexing (OFDM), has drawn a lot of attention. On the other hand (CDMA) techniques have been considered to be a candidate to support multimedia services in mobile radio communications. In this paper, STBC-OFDM block have been studied extensively, and proposed a new structure for STBC-OFDM that based on Multi-filters called Multi-WaveleTs using Critically-Sampled (DMWTCS), it has two or more low-pass and high-pass filters, the purpose of this multiplicity is to achieve more BER performance than the conventional STBC-OFDM using FFT and DWT.