Communications engineering. MDMA combines amplitude-, frequency- and phase modulation. It is an analog method that uses the whole bandwidth of the 2.4 GHz ISM-band as one transmission channel. Due to low electromagnetic interference with other devices transmitting in this band the transmission energy can be kept low.
MDMA uses a Sync pulse for the transmission in the base band and a Chirp pulse for radio transmission. Its quality can be adjusted to the requirements of the services (i.e. voice transmission, data transfer).
The data rate can reach more than 100 Mbit/s over a range of 100 m outdoors and 10 m indoors, at a data rate of 2 Mbit/s the transmission range increases to 800 m outdoors and 80 m indoors. MDMA is used in WLANs with medium and high data rates. It is defined in IEEE 802.15.4a.
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