Title :
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
fDate :
5/1/1996 12:00:00 AM
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;
Journal_Title :
Selected Areas in Communications, IEEE Journal on
