采用甲类功放的MQAM发射机能效研究

his paper derives the energy efficiency (EE), i.e.,the total energy consumed for conveying per message bitsfor the transmitter using Class-A linear power amplifier (PA) andM-ary Quadrature Amplitude Modulation(MQAM).The transmission is over a flat-fading channelwith bit error rate (BER) smaller than a prescribed value.The energy consumption of both baseband and radio-frequency circuitsis taken into account.The impact of symbol pulse on the EE is studied,and a metric which enables comparison ofthe EE corresponding to different pulses is defined.A geometric-interpretation based method is proposed to showthe fundamental mechanism on the impact of spectral efficiency (SE) on the EE,which reveals the fact that the EE first improves then degrades as the SE increases.The fact is finally corroborated by simulation results.