The purpose of the ‘Burst QPSK/16QAM Modulator’ is the data transmission from the subscriber to the service provider (upstream) via coax cable. Thus, its main applications are cable modems at the subscriber’s home. In such systems one headend cable modem serves 500 to 2000 subscriber’s cable modems. The connecting coax cable must be shared in upstream direction. These multipoint-to-point connections are controlled by one headend modem, which assigns time slots for data transmission to the different cable modems. Therefore the transmitter in the subscriber’s cable modem must be able to transfer enclosed data blocks in the assigned time periods (i.e. bursts) and not to send continuously.

quadraam16sim\qam16.mdl
quadraam16sim

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