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| | MIT Project Oxygen: H21 Mobile Devices |
 | | Because handheld devices must be small, lightweight, and power efficient, H21s come equipped with only a few perceptual and communication transducers, plus a low-power network to extend the I/O devices to which it can connect. |
 | | Software on the H21 determines the device's current location and orientation, discovers the extant communication protocols within the environment, and locates and downloads the appropriate communication and signal processing software (e.g., for AMPS or CDMA), when necessary, from other nearby H21s or E21s. |
 | | When a receiver experiences high noise on a channel, software may choose to increase the number of filter taps and clean up the signal, to drop data that won't be missed (e.g., a millisecond of voice data), to request transmission of the corrupted data, or to request a change in transmission power or modulation format. |
| oxygen.lcs.mit.edu /H21.html (995 words) |
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