However, with the EDGE extension to the GSM mobile radio system, {HEAD ~ the problem} of reliably monitoring the output power has been raised in {TAIL ~ a more serious form} since, in this case, both the phase and the amplitude information must be transmitted linearly by the output stage 
raised in
However , with the EDGE extension to the GSM mobile radio system , { HEAD ~ the problem } of reliably monitoring the output power has been raised in { TAIL ~ a more serious form } since , in this case , both the phase and the amplitude information must be transmitted linearly by the output stage
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