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IEICE TRANSACTIONS on Fundamentals

Application of Successive Interference Cancellation to a Packet-Recognition/Code-Acquisition Scheme in CDMA Unslotted ALOHA Systems

Yukihiro TADOKORO, Hiraku OKADA, Takaya YAMAZATO, Masaaki KATAYAMA

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Summary :

Packet-recognition/code-acquisition (PR/CA) is one of the most important issues in packet communication systems. In a CDMA Unslotted ALOHA system, Multiple Access Interference (MAI) may bring about errors in PR/CA. The MAI mainly stems from already recognized packets and newly arriving packets under the execution of PR/CA. This characteristic of asynchronous transmission in CDMA U-ALOHA systems implies that only one or a few packets arrive at the receiver within a short interval of a execution. Furthermore, newly arriving packets are recognized and code-acquired by using a short preamble part. Consequently, the MAI from the packets under the execution of the PR/CA will be small. Focusing on that point, this paper proposes applying the IC scheme in order to suppress the MAI from the already recognized and code-acquired packets. A performance evaluation demonstrates that such an application is valid due to the small amount of MAI from the packets under the execution of PR/CA. In addition, we demonstrates that the scheme reduces false recognition rather than mis-recognition. Such a scheme improves the performance of not only PR/CA, but also the throughput.

Publication
IEICE TRANSACTIONS on Fundamentals Vol.E88-A No.6 pp.1605-1612
Publication Date
2005/06/01
Publicized
Online ISSN
DOI
10.1093/ietfec/e88-a.6.1605
Type of Manuscript
PAPER
Category
Communication Theory and Signals

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