Performance of Slotted-Aloha over TH-UWB

Hwee Xian Tan, Ranjeet K. Patrot, Mun Choon Chan, Peng Yong Kong, Chen Khong Tham

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

8 Scopus citations


In the IEEE 802.15.4a UWB-PHY standard for Low Rate WPANs (LR-WPANs), the UWB-PHY provides Time-Hopping (TH) to enable multiple users to transmit simultaneously, thereby potentially increasing the overall system throughput. However, the intrinsic properties of the impulse-based UWB renders existing narrowband MAC protocols which make use of carrier sensing unsuitable for use in UWB systems. In the standard, Aloha has been proposed as the MAC protocol. In this paper, we study the throughput performance of slotted-Aloha, an enhanced version of the Aloha MAC protocol, over the TH-UWB physical layer, using both theoretical analysis and simulations. Our results show that random time-hopping can be detrimental to the throughput performance of the network. An optimal method of assigning TH codes to the different symbols in each packet is necessary in order to exploit the benefits of time-hopping, which can potentially allow concurrent transmissions in multiuser systems.

Original languageBritish English
Title of host publication2007 IEEE International Conference on Ultra-Wideband, ICUWB
Number of pages6
StatePublished - 2007
Event2007 IEEE International Conference on Ultra-Wideband, ICUWB - , Singapore
Duration: 24 Sep 200727 Sep 2007

Publication series

Name2007 IEEE International Conference on Ultra-Wideband, ICUWB


Conference2007 IEEE International Conference on Ultra-Wideband, ICUWB


  • MAC
  • Normalized throughput
  • Slotted-aloha
  • Time-hopping
  • UWB


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