By Houda Labiod, Hossam Afifi, Costantino de Santis
Wi-Fi™, Bluetooth™, ZigBee™ and WiMax™ will supply an entire and exact description of the new instant applied sciences together with wireless, Bluetooth, ZigBee and WiMAX. those applied sciences are thought of to be vital subject matters within the telecommunication within the subsequent decade. a few severe topics may be quite constructed comparable to defense, caliber of provider, roaming and gear conservation. Wi-Fi™, Bluetooth™, ZigBee™ and WiMax™will additionally contain a few chapters on practicals aspects.
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Extra resources for Wi-Fi, Bluetooth, Zigbee and WiMax
Stream parser – divides the outputs of the encoders into blocks that will be sent to interleavers and mapping devices. The sequences of the bits sent to the interleavers are called spatial streams. 40 Wi-FiTM , BluetoothTM , ZigBeeTM and WiMAXTM • Interleaver – interleaves the bits of each spatial stream (changes order of bits) to prevent long sequences of adjacent noisy bits from entering the FEC decoder. • QAM mapping – maps the sequence of bits in each spatial stream to constellation points (complex numbers).
If the needs are directed towards a broad cover or High throughputs, then the selected technique will be DSSS. In addition, in the case of a highly multipath environment, it is preferable to use the FHSS technique. 11b DSSS standard that offers four throughputs. The selected throughput is defined dynamically according to the radio conditions. 20 illustrates this mechanism. We notice that more the equipment is close to the AP, more the throughput used is high for both FHSS and DSSS. 5, then 2 and 1 Mbps.
Then, when an STA is polled, its gets the permission to transmit data frame.
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