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The efficiency of slotted-ALOHA scheme is upper limited by 37%. However, it is very easy to implement. To increase system efficiency, code division multiple accessing (CDMA) technique can be adopted in ALOHA scheme. This paper studies a medium access scheme, utilizing two dimensional reservations: time dimension and code dimension. The reservation rate and collision rate are analyzed theoretically. Simulation results are given under ideal channel condition and noisy single-path Rayleigh channel condition. Theoretical analysis and simulation results demonstrate that the reservation rate is increased and collision rate is reduced due to the anti-collision advantage of CDMA code.
Published in:
Wireless Communications, Networking and Mobile Computing, 2007. WiCom 2007. International Conference on
Date of Conference: 21-25 Sept. 2007
- Page(s):
- 2165 - 2168
- Print ISBN:
- 978-1-4244-1311-9
- INSPEC Accession Number:
- 10046637
- Conference Location :
- Shanghai
- Digital Object Identifier :
- 10.1109/WICOM.2007.540
- Product Type:
- Conference Publications
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