Performance improvement of OFDM system using an adaptive coding technique in wireless home network

  • Authors:

  • JiWoong Kim;Heau Jo Kang

  • Affiliations:

  • FUMATE Inc., Korea;Division of Computer & Multimedia Content Eng., Taejon Mokwon University, Taejon, Korea

  • Venue:
  • KES'05 Proceedings of the 9th international conference on Knowledge-Based Intelligent Information and Engineering Systems - Volume Part I
  • Year:
  • 2005

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Abstract

Since OFDM method uses Fast Fourier Transform(FFT) algorithm, it can make the size of circuits smaller and also can vary transmission capacity by adaptive changing the number of subcarrier. Therefore, OFDM method may be applied as digital broadcasting and physical layer transmission mode of intelligent system. In this paper, we analyzes how a synchronization error affects receiving system when using a adaptive coded OFDM(Orthogonal Frequency Division Multiplexing) transmission method in wireless LAN channel environment in which we can efficiently transmit wide-band information data. As a result, in OFDM system, we could see that the higher a frequency offset is, the worse performance will be, and we could see that there was performance improvement by applying adaptive coding technique in OFDM system in order to reach (BER=10−−3). However, when we use 64QAM(64Quadrature Amplitude Modulation), there was a huge influence between carriers by frequency offset at 0.05, 0.1.