A new signaling scheme for large DS-CDMA channels without CSI

  • Authors:

  • Keigo Takeuehi;Rail R. Müller;Mikko Vehkaperä;Toshiyuki Tanaka

  • Affiliations:

  • Dept Information & Communication Engineering, The University of Electro-Communications, Tokyo, Japan;Dept Elec. & Telecommun., Norwegian University of Science and Technology, Trondheim, Norway;Dept Elec. & Telecommun., Norwegian University of Science and Technology, Trondheim, Norway;Graduate School of Informatics, Kyoto University, Kyoto, Japan

  • Venue:
  • WiOPT'09 Proceedings of the 7th international conference on Modeling and Optimization in Mobile, Ad Hoc, and Wireless Networks
  • Year:
  • 2009

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Abstract

We propose a novel signaling scheme for wireless communication systems without channel state information (CSI). In that scheme, a bias of the occurrence probabilities of constellation points is utilized as pilot information known to the receiver, whereas pilot signals known to the receiver are sent in conventional pilot-based approaches. We evaluate the performance of the new scheme and conventional pilot-based schemes for a large direct-sequence code-division multiple-access (DS-CDMA) system, by using the replica method. It is shown that the new scheme outperforms the conventional pilot-based scheme when the amount of pilot information is large.