Authors
Abstract
In this paper discrete wavelet transform based orthogonal frequency division multiplexing (DWT-OFDM) system its proposed to improve the bandwidth efficiency by removing the cyclic prefix (CP). For further enhancement of performance of the proposed DWT-OFDM system model a combination of direct sequence spread spectrum (DS/SS) with DWT- OFDM system was proposed.
Computer simulations were presented for showing the performances of systems over selective Rayleigh fading channel. The simulation process included a comparison between single carrier system, FFT-OFDM system, DS/SS-OFDM system, proposed DWT-OFDM system, and proposed DS/SS-DWT-OFDM system for different conditions. The result showed the proposed DWT-OFDM system a better performance than FFT-OFDM system. Furthermore, the performance of DWT-OFDM system enhancement by using DS/SS system.
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