enhanced data rate (Bluetooth) (EDR)
Enhanced Data Rate (EDR) is a Bluetooth standard developed by the Bluetooth Special Interest Group( BSIG), which triples the data rate of Bluetooth from version 2.0 with the Basic Rate( BR) from 723 kbit/s to 2.169 Mbit/s. In addition, the designation Enhanced Data Rate (EDR) is also used in the InfiniBand for an increased data rate IB-EDR.
The increase in data rate is made possible by a change in the modulation method. Whereas all data in Bluetooth communication was previously modulated using Gaussian Frequency Shift Keying( GFSK), the EDR method transmits the payload data in two different modulations, Differential Phase Shift Keying( DPSK) and Differential Quaternary Phase Shift Keying( DQPSK), depending on the quality of the radio channel. A further increase in data rate is possible with 8DPSK modulation.
EDR operation can only take place in a piconet if a master supports the EDR functionality. The higher data rate of Enhanced Data Rate provides better voice quality and can also be used for transmitting streaming audio, streaming video, graphics and photos, as well as printing and scanning.