Proposed Realization of modified Scrambling using 2D-DWT Based OFDM Transceivers

Voice communication Protection is possible and may be in the future becomes a preferable to view the problem of security of voice communication in term of the classical producing speech ciphering system. The use of different form of speech scramblers have thus been a common approach to voice security. The main aim of this work is to model and simulation a proposed hybrid structure of speech scrambling system based on 2-Dimenations Discrete Wavelet Transform and best direction of optimal ordering as permutation. The design of scrambling system consists of three main parts, i.e transmitter, receiver and noisy channel. The system investigates 2D-DWT scrambling part and permutation by best direction and inverse 2D-DWT as a hybrid scrambler structure. This processes achieved in transmitter will be use an inverted structure in receiver. The proposed system was examined by using Arabic and English, Analog speech signals. Then for each case the performance evaluation process of the proposed system was taken into consideration via the using of OFDM simulation. The proposed structure with OFDM gave a significant improvement in the BER performance in comxarison with the conventional OFDM when tested for different channel types. The modification OFDM more secures than conventional OFDM