Title :
Capture Effects in Opportunistic Slotted ALOHA over Rayleigh Fading Channels
Author :
Hu, Xiaoyu ; Yao, Yu-Dong
Author_Institution :
Dept. of Electr. & Comput. Eng., Stevens Inst. of Technol., Hoboken, NJ
Abstract :
This paper studies the throughput, average packet delay and average power consumption for opportunistic slotted ALOHA (OS-ALOHA) in Rayleigh fading channels. The basic idea of the opportunistic transmission is to control the transmission probability of each user based on the channel quality. If the channel is good, a user transmits the packet; otherwise it holds the packet. A finite state Markov chain (FSMC) channel is modeled and the capture effect is considered in this paper. The channel fading is assumed to be correlated from slot to slot and channel state transition is incorporated into the analysis of system performance. The system performance for OS-ALOHA is investigated considering packet traffic statistics. Compared to conventional slotted ALOHA, OS-ALOHA systems show a higher throughput, smaller average delay and higher power efficiency.
Keywords :
Markov processes; Rayleigh channels; access protocols; channel estimation; Rayleigh fading channels; average packet delay; average power consumption; channel quality; channel state transition; finite state Markov chain channel; opportunistic slotted ALOHA; traffic statistics; Delay; Energy consumption; Fading; Media Access Protocol; Multiaccess communication; Rayleigh channels; System performance; Throughput; Traffic control; Wireless networks;
Conference_Titel :
Global Telecommunications Conference, 2008. IEEE GLOBECOM 2008. IEEE
Conference_Location :
New Orleans, LO
Print_ISBN :
978-1-4244-2324-8
DOI :
10.1109/GLOCOM.2008.ECP.747
