choosing a particular modulation schemes in RF Transceivers

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deepu_gane

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1. How do we choose a particular modulation scheme in RF Transceiver (Zigbee uses OQPSK),(Bluetooth LE uses GFSK).WhY zigbee uses OQPSK and BLE uses GFSK?why not other modulation schemes?
2. Is there any relationship between modulation scheme and path loss?.
 

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