Abstract
In the mobile environments, the channel will be
highly hostile at high data rate transmission. To combat with
this problem, many designs were proposed and developed,
such as, Orthogonal Frequency Division Multiplexing
(OFDM) system. Adaptive modulation improves the system
efficiency by matching transmission parameters to channel
variations, so that, OFDM system with Adaptive modulation
technique will be achieved an efficient bandwidth
transmission technique in wireless fading environments. In
this paper, Discrete Wavelet Transform (DWT) is used in
OFDM system and illustrates the improvement of Bit Error
Rate (BER) and throughput performances compared with
used Discrete Fourier Transform (DFT). DWT with Zero
Padding (DWT-ZP) is also used as addition technique which
supports high performances for the system, all tested in
frequency selective fading channel. The obtained results
show that a significant improvements in BER and
throughput can be achieved demonstrating the superiority of
use DWT compared with use traditional DFT in Adaptive
OFDM system.
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