Throughput analysis of DS/SSMA unslotted ALOHA system with fixed packet length

Author

Sato, Takeshi ; Okada, Hiraku ; Yamazato, Takaya ; Katayama, Masaaki ; Ogawa, Akira

Author_Institution

Sch. of Eng., Nagoya Univ., Japan

Volume

14

Issue

4

fYear

1996

fDate

5/1/1996 12:00:00 AM

Firstpage

750

Lastpage

756

Abstract

Throughput analysis of direct-sequence spread spectrum multiple access (DS/SSMA) unslotted ALOHA with fixed packet length is presented. As the levels of multi-user interference fluctuate during the packet transmission, we calculate the packet error probability and the throughput by considering not only the number of overlapped packets but also the amount of time overlap. On the assumption that packet generation is Poisson, the system can be thought as the queueing system M/D/∞. With Gaussian approximation of multi-user interference, we obtain the throughput as the function of the number of chips in a bit, the packet length, and the offered load of the system. We also analyze the channel load sensing protocol (CLSP), and obtain the optimum threshold of CLSP

Keywords

Gaussian noise; access protocols; code division multiple access; error statistics; interference (signal); packet radio networks; queueing theory; spread spectrum communication; CDMA; DS/SSMA unslotted ALOHA system; Gaussian approximation; channel load sensing protocol; direct-sequence spread spectrum multiple access; fixed packet length; multi-user interference; overlapped packets; packet error probability; packet radio network; packet transmission; queueing system; throughput analysis; time overlap; Access protocols; Error probability; Gaussian approximation; Gaussian noise; Interference; Multiaccess communication; Packet radio networks; Performance analysis; Spread spectrum communication; Throughput;

fLanguage

English

Journal_Title

Selected Areas in Communications, IEEE Journal on

Publisher

ieee

ISSN

0733-8716

Type

jour

DOI

10.1109/49.490426

Filename

490426