నైరూప్య

MINIMIZATION OF MAI AND ISI DISTORTION EFFECT IN WIRELESS SYSTEM BY OFDMA-IDMA TRANSMISSION APPROACH IN NOISY CHANNELS

B.S.Rai, Shambhu kumar

Along with providing existing communication application in a mobile fashion many new services have become available which explicitly require mobile broadband access. The increase in demands on wireless applications, future systems have to structure new technologies that support high capacity and QOS. In this paper we determine the effect of a combined IDMA-OFDMA system on performance of bit error rate (BER) with respect to change in SNR during wireless transmission for different modulation schemes. We have minimized ISI by the cyclic prefixing technique in OFDM [4], by iterative detection with IDMA [5]. OFDM-IDMA has advantages of low-cost receiver, diversity against fading and flexible rate adaptation.