OFDM system performance enhancement using wavelet transform and DS-SS system over multipath fading channel

الملخص EN

In this paper discrete wavelet transform based orthogonal frequency division multiplexing (DWT-OFDM) system it's 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 systems, 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.