EURASIP Journal on Advances in Signal Processing
Volume 2009 (2009), Article ID 873202, 14 pages
doi:10.1155/2009/873202
Research Article
Further Development of Synchronous Array Method for Ad Hoc Wireless Networks
1Department of Electrical Engineering, University of California, Riverside, CA 92521, USA
2Cinea, Inc., 16 S. 17th Street, Richmond, VA 23219, USA
Received 1 February 2008; Revised 10 May 2008; Accepted 22 July 2008
Academic Editor: Mary Ingram
Copyright © 2009 Yuan Yu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
A further development of the synchronous array method (SAM) as a medium access control scheme for large-scale ad hoc wireless networks is presented. Under SAM, all transmissions of data packets between adjacent nodes are
synchronized on a frame-by-frame basis, and the spacing between concurrent cochannel transmissions of data packets is properly controlled. An opportunistic SAM (O-SAM) is presented which allows concurrent cochannel transmissions to be locally adaptive to channel gain variations. A distributed SAM (D-SAM) is discussed that schedules all concurrent cochannel transmissions in a distributed fashion. For networks of low mobility, the control overhead required by SAM can be made much smaller than the payload. By analysis and simulation, the intranetwork throughput of O-SAM and D-SAM is evaluated. The effects of traffic load and multiple antennas on the intranetwork throughput are studied.
The throughput of ALOHA is also analyzed and compared with that of O-SAM and D-SAM. By a distance-weighted throughput, a comparison of long distance transmission versus short distance transmission is also presented. The study of D-SAM reveals an important insight into the MSH-DSCH protocol adopted in IEEE 802.16 standards.