Abstract
AbstractMultiple access interference (MAI) occurs in the CDMA Unslotted ALOHA system and is a significant factor for degradation of performances. Further, in this system, there are frequent situations in which the received signal power becomes inhomogeneous so that the effect of the MAI is enhanced. Presently, an interference cancellation technique is developed as a way to suppress the MAI. However, this method mainly deals with a system that transmits and receives signals continuously in time. The evaluation of the performances is also by means of the bit error rate. In the packet communication system, success or failure of the transmission of each packet rather than of the transmission of each bit is the key to system performances. Hence, in the present study, a system is proposed that uses a successive interference cancellation as one of the interference cancellation techniques to the CDMA Unslotted ALOHA system. The throughput performance is analytically derived for performance evaluation. Also, in general, the performances under the situation of unequal received signal power are worse than those for equal received power. However, in the proposed system, performance can be better in an unequal received power environment than in the equal power case. © 2004 Wiley Periodicals, Inc. Electron Comm Jpn Pt 3, 87(6): 32–43, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/ecjc.10116
Published Version
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