This work focused on the problem of finding a suitable medium access control protocol so that the nodes of a given cluster could communicate efficiently within their respective activity window. The nodes thus saved energy by turning off their transceivers during the time that they did not have to exchange information. This works main objective was to ensure that the nodes were mainly focused on energy efficiency and delivering packages, taking quality of service (QoS) requirements into account and comparing their performance to an existing protocol called sensor medium access control (S-MAC). The parameters being compared were the time that the nodes were asleep, energy consumption and average delay. This work was completed by using the OPNET simulator tool (OPNET Modeler, version 11.5.A PL3, OPNET Technologies Company Inc). This approach greatly improved the "PCF + Sleep” performance proposed in this work over the earlier S-MAC.
This article presents the development of a personal computer-based AM/FM radio station operating on the AM/FM commercial band. Developing the graphical user interface for the software and the interconnection with an RF function generator by means of a GPIB is presented. Computer users can enter the desired transmission frequency within the commercial band as well as the transmission potency.
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