In {TAIL ~ the case} of {HEAD ~ the GSM mobile radio system}, which operates using the GMSK modulation method, the described problem has been solved using complex circuitry for the power amplifier and for controlling the power amplifier 
In { TAIL ~ the case } of { HEAD ~ the GSM mobile radio system } , which operates using the GMSK modulation method , the described problem has been solved using complex circuitry for the power amplifier and for controlling the power amplifier
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