Wireless Ad Hoc and Sensor Networks

Distributed Power Control of Wireless Cellular and Peer-to-Peer Networks 193120100SSCDOptimalBambosCSOPCTotal power consumed vs. number of usersTotal power consumed806040BambosCSOPC20020OptimalSSCD40 60 80 100 120 140 160 180Number of usersFIGURE 5.6Total power consumed with number of users.simulation. Given the small power update interval, a value of 0.01 km isa considerable amount of distance. The initial and final location of usersin the cellular network is shown in Figure 5.7 and Figure 5.8. Soft handoffis utilized when a user moves from one cell to the other. From Figure 5.9and Figure 5.10, we see that the outage probability and total power consumedby optimal DPC scheme is significantly lower compared to Bambosand CSOPC.Example 5.2.3: DPC for Peer-to-Peer NetworksTo demonstrate the performance of our DPC, a peer-to-peer network isselected. The wireless network is designed to span an area of 500 unitsas shown in Figure 5.2. The link’s transmitter is placed randomly in asquare region of dimensions 500 x 500 units. For all the receivers, theκnormalized noise floor, i, is taken to be at 10 9 . The link’s receiver is placedgat a distance of 50 units from the transmitter. Path loss only is considered,and the attenuation of power is assumed to follow the inverse fourthpower law. The SIR at the transmitter of the link i is computed usingEquation 5.2.