| | |
Summary: Novel Time-Frequency Reservation Aloha Scheme
for OFDMA Systems
Elias Yaacoub1, Mohamad Adnan Al-Alaoui2, and Zaher Dawy2
1QU Wireless Innovations Center (QUWIC), Qatar Science and Technology Park, Doha, Qatar
2Department of Electrical and Computer Engineering, American University of Beirut, Beirut, Lebanon
Email: eliasy@quwic.com; {adnan, zaher.dawy}@aub.edu.lb
Abstract-- A novel reservation Aloha scheme is presented
for OFDMA systems. The proposed scheme is based on two
dimensional reservation in time and frequency. The proposed
approach is compared to other OFDMA extensions of reserva-
tion Aloha. The proposed scheme is shown to be superior in
terms of increasing sum-rate, reducing the number of users in
outage, and reducing the collision probability in the reservation
phase.
Index Terms-- OFDMA, reservation Aloha, opportunistic
transmission, probabilistic scheduling
I. INTRODUCTION
Aloha is one of the first algorithms for random access [1],
[2]. Aloha is commonly studied under a single channel
assumption, in which user contention happens over only
|
