12.07.2015 Views

Wireless Ad Hoc and Sensor Networks

Wireless Ad Hoc and Sensor Networks

Wireless Ad Hoc and Sensor Networks

SHOW MORE
SHOW LESS
  • No tags were found...

You also want an ePaper? Increase the reach of your titles

YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.

Distributed Power Control <strong>and</strong> Rate <strong>Ad</strong>aptation 279Totaldata per Joule (Kbits/J)262422201816141210860 10Data transmitted per Joule50 nodes, 25 flows, duration 25s20 30 40 50 60Per-flow rate (Kbps)Rate adaptation with DPCRBARFIGURE 6.21Data transmitted per joule for varying per flow rate.6.10.3 R<strong>and</strong>om Topology with 50 NodesFigure 6.21 shows the total data transmitted by 25 constant bit-rate (CBR)sources <strong>and</strong> received at the destinations, in the presence of fading channels,whereas the energy efficiency is presented in Figure 6.19. Asexpected, the proposed protocol transmits more data <strong>and</strong> consumes lessenergy per bit when compared to the RBAR protocol for all the trafficrates because of the proposed rate adaptation. These results reaffirm theconclusions from the previous simulations.6.10.4 Two-Hop ResultsThe two-hop topology has been used while simulating the proposedDP-based scheme (PDP). For comparison, a modified RBAR protocol(BURST), which supports a burst mode, is used. The same parametersused in the previous simulations have been used. In addition, the informationfor the other parameters needed to simulate the DP-based algorithminclude: cost function parameters Q = 05 . <strong>and</strong> α = 24 . (from Figure6.17), <strong>and</strong> an expected power value was taken as 100 mW. The stable valueof G was calculated as 0.667. The target queue utilization is set at 30packets per flow. The burst size, outgoing, <strong>and</strong> incoming traffic areexpressed in number of packets (or number of packets per second). Furthermore,the burst duration was set to one packet duration when usingthe lowest rate. Consequently, the burst at the lowest rate of 1 Mbps can

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!