Bit error rate performance analysis of optical CDMA time-diversity links over gamma-gamma atmospheric turbulence channels

Peng Liu, Xueying Wu, Kazuhiko Wakamori, Tien Dat Pham, Mohammad Shah Alam, Mitsuji Matsumoto

研究成果: Conference contribution

17 被引用数 (Scopus)

抄録

When we use the free space optical(FSO) communication in the near-ground, it will be great influenced by the atmospheric turbulence. There are many studies on the effects of atmospheric turbulence in FSO. Recently gamma-gamma is a widely accepted model for the optical propagating through the atmosphere in normal and strong turbulence. In order to enhance bit error rate(BER) performance influenced by turbulence-induced fading, we promote a new time-diversity scheme which use optical code division multiple access(OCDMA) as channel division code. As we know, time-diversity is an effective method to enhance the throughput performance of wireless communication system. In order to provide a higher performing and cost-efficient solution OCDMA time-diversity scheme is proposed. In this paper, we analyze the performance of the new scheme with gamma-gamma model. We first present the structure of the OCDMA time-diversity scheme. Then we present the temporal covariance of gamma-gamma model to get the independent time-interval of atmospheric turbulence. We use experiment data to confirm theoretical result. At last we give the theoretical analysis on the BER of new scheme, and use numerical results to prove the theoretical analysis. We find that the new OCDMA time-diversity scheme can enhance the BER for several orders in strong turbulence. Furthermore, the performance of the new scheme in strong turbulence is even better than the traditional scheme in normal turbulence.

本文言語English
ホスト出版物のタイトル2011 IEEE Wireless Communications and Networking Conference, WCNC 2011
ページ1932-1936
ページ数5
DOI
出版ステータスPublished - 2011
イベント2011 IEEE Wireless Communications and Networking Conference, WCNC 2011 - Cancun
継続期間: 2011 3 282011 3 31

Other

Other2011 IEEE Wireless Communications and Networking Conference, WCNC 2011
CityCancun
Period11/3/2811/3/31

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Communication

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