By T Basten, M. Gellen
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Additional resources for Ambient Intelligence - Impact on Embedded System Design
Requirements engineering for embedded systems design can no longer be seen as a task that can be accomplished through the development of scenario’s and the translation of use cases into system requirements. System functionalities that generate true user experiences can only be determined in a reliable way from feasible prototypes providing proofs of concept. These are called experience prototypes‚ and in order to support their effective and efficient development prototyping environments are needed that that facilitate both feasibility and usability studies.
In some cases‚ even the transceiver section can be implemented in CMOS technology and integrated onto the same chip. Fewer components translate into reduced billof-materials required for a multi-mode implementation of the device‚ and cost is reduced as a consequence. The previous analysis identifies the essential requirements of a wireless base station suitable for a pervasive computing paradigm: Ambient Intelligence: A Computational Platform Perspective 39 Low-energy consumption‚ in the order of the hundreds of mW; High-bandwidth‚ in the range offered by WLAN technologies (in the order of tens of Mbps); Security features to protect the transmitted data.
This implies intrinsically low average power‚ yet meeting such tight power constraint may be difficult. To understand whether this power budget is really a constraint‚ we must define what functionalities a typical sensor should provide. Figure 3 shows the main components of a typical wireless sensor. The architecture obviously include the actual sensor section with its relative interface. The type and number of hosted sensors will depend on the target application. The sensors provide inputs to the computational units‚ that process 44 AMBIENT INTELLIGENCE: IMPACT ON EMBEDDED SYSTEM DESIGN data from the sensors and executes all the tasks that deal with the transmission and the reception of data from the wireless interface section.