Throughput Improvement of CDMA Slotted ALOHA Systems

Masato SAITO  Hiraku OKADA  Takeshi SATO  Takaya YAMAZATO  Masaaki KATAYAMA  Akira OGAWA  

IEICE TRANSACTIONS on Communications   Vol.E80-B    No.1    pp.74-80
Publication Date: 1997/01/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Advances in Satellite Communications toward Multimedia Era)
Category: Protocol
CDMA slotted ALOHA systems,  QS-sequences,  access timing error,  modified channel load sensing protocol,  access timing delay,  

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In this paper, we evaluate the throughput performance of CDMA Slotted ALOHA systems. To improve the throughput performance, we employ the Quasi-synchronous sequences and the Modified Channel Load Sensing Protocol as an access control procedure. As a result, we found a good throughput by the QS-sequences. By employing MCLSP, we can keep the maximum throughput even in high offered load and in the presence of a long access timing delay, which is one of the issue in satellite packet communication systems.