A Reasonable Throughput Analysis of the CSK/SSMA Unslotted ALOHA System with Nonorthogonal Sequences*

  • Authors:

  • Nobuyoshi Komuro;Hiromasa Habuchi

  • Affiliations:

  • The author is with the Graduate School of Science and Engineering, Ibaraki University, Hitachi-shi, 316-8511 Japan. E-mail: nkmr@cis.ibaraki.ac.jp,;The author is with the Department of Computer and Information Sciences, Faculty of Engineering, Ibaraki University, Hitachi-shi, 316-8511 Japan. E-mail: habuchi@mx.ibaraki.ac.jp

  • Venue:
  • IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences
  • Year:
  • 2005

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Abstract

In this paper, the throughput performance of the CSK/SSMA ALOHA system with nonorthogonal sequences which combines the ALOHA system with Code Shift Keying using nonorthogonal sequences is analyzed. In this system, the nonorthogonal sequences are constructed by concatenating Mcon orthogonal sequences. The throughput performance of the CSK/SSMA ALOHA system with nonorthogonal sequences is analyzed in consideration that the number of packets changes at intervals of one orthogonal sequence. Moreover, the throughput performance of our system with Channel Load Sensing Protocol (CLSP) is also analyzed. We also examine the influence of unreachable control signal of CLSP. Consequently, it is found that the throughput performance of our system decreases significantly by this analysis. It is also found that the throughput performance of our system improves greatly by using CLSP. However, the unreachable control signal affects the throughput performance of this system, seriously.