By Topic

Opportunistic multichannel Aloha for clustered OFDM wireless networks

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$33 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

2 Author(s)
Kai Bai ; Dept. of Electr. Eng., Arizona State Univ., Tempe, AZ, USA ; Junshan Zhang

We consider multi-access control for the uplink in OFDMA networks. Assuming that subcarriers are grouped into clusters, we investigate multichannel random access based on local channel state information, and propose an opportunistic multichannel Aloha scheme to maximize the system throughput. A key step is to build a mapping from a user's channel state information to its transmission probability and channel allocation. For the sake of comparison, we also characterize the throughput corresponding to the optimal centralized scheduling by using the extreme-value theory of order statistics. We show that the opportunistic multichannel Aloha scheme is asymptotically order-optimal, in the sense that the only performance loss compared to the optimal centralized scheduling is due to the contention inherent in random access. In addition, we generalize the study to heterogeneous cases. Our findings show that when each user behaves as if it were in homogeneous systems, the proposed scheme can provide proportional fairness among the users

Published in:

Second International Conference on Quality of Service in Heterogeneous Wired/Wireless Networks (QSHINE'05)

Date of Conference:

24-24 Aug. 2005