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By Strassman S.

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Sample text

In this “cellular” system, the same frequencies used for a set of channels are “reused” in other cells as well. This frequency reuse strategy is done with minimal channel interference across the cells. 3, the cells A and B, which are geographically well separated, may use the same frequency band without suffering mutual interference. Further, the cells can be split judiciously into smaller cells in the event of increases in the user population per cell. When a mobile user goes from one cell region into another, the service responsibility is shifted from the first cell to the next one by means of a central base station control.

Considering the WATM protocol stack, the bottom three layers make up the radio access layer (RAL). The RAL is required to support the new wireless specific protocols that will define the physical and access layers. At the physical layer there are multiple competing solutions. Currently the two front runners are CDMA and TDMA but new technologies are on the way. It is likely that there will be more than one answer. The medium access control (MAC) relates to the user’s ability to access the wireless media in order to guarantee the QoS.

Essentially, the transmitter and receiver parts of the Bluetooth system use the hopping frequency scheme, thus facilitating modulation and demodulation of the baseband signal with a frequency-modulation scheme. That is, the Bluetooth conceptually connects everything wirelessly with a frequency-hopping radio link in short-range areas. For example, a Bluetooth solution can replace the interconnecting cable across any electronic devices to be linked together for communication. 11) and/or infrared-based WLAN of IrDA (Infrared Data Association).

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