Design a New HiperLAN/2 Transceiver Based DCT-OFDM

Abstract

Wireless LAN technologies like HiperLAN/2 transceiver are getting very important to realize mobile broadband systems. However, a shortage of allocated RF channels for the wireless LANs causes’ interference signals that seriously degrade the system throughput in multi-cell environments. In this paper, a proposed model based on discrete cosine Transform (DCT) OFDM was suggested to improve the performance of HiperLAN/2 transceiver lies the under the Additive White Gaussian Noise (AWGN), flat fading, selective fading channels. This model is used to reduce the effect of multipath fading. The results extracted by a computer simulation for a model proposed, and then it compared with the original technique for HiperLAN/2 transceiver based on DCT for both systems. As a result, it can be seen from the proposed technique that a high performance improvement was obtained over the conventional HiperLAN/2 transceiver, where the Bit Error Rate (BER) is widely reduced under different channel characteristics for the AWGN, flat fading, and selective fading channels.

Keywords: HiperLAN/2, AWGN, BER, OFDM, DCT.