caoquyen164
Junior Member level 2
Dear all,
I'm choosing a 1W power amplifier for QAM 256, 20MHz bandwidth signal.
as far I know, the QAM256. 20MHz signal is such like the below.
the the total power of 20mhz signal is 1W=30dbm, the power of a 1HZ bandwidth signal is 30-10log(20*10^6)= -43dbm. besides, the PAR of 256QAM ~ 7-> the peak power of a signal is -36dbm.
so, I just need a power amplifier which can stand only -36dbm (may be need some more back-off). Did I wrong ?
I'm choosing a 1W power amplifier for QAM 256, 20MHz bandwidth signal.
as far I know, the QAM256. 20MHz signal is such like the below.
the the total power of 20mhz signal is 1W=30dbm, the power of a 1HZ bandwidth signal is 30-10log(20*10^6)= -43dbm. besides, the PAR of 256QAM ~ 7-> the peak power of a signal is -36dbm.
so, I just need a power amplifier which can stand only -36dbm (may be need some more back-off). Did I wrong ?