A 5-level RF-PWM method with third and fifth harmonic elimination for
all-digital transmitters
Abstract
To relax the requirement of the filter and reduce the control complexity
of the SMPA, this paper proposes a 5-level RF-PWM method for all-digital
transmitters with 3rd and 5th harmonic elimination. The method is
achieved by changing the threshold signal to control the pulse width of
the 3-level sub-pulses. Finally, the feasibility of the method is
verified by simulation. For the 16QAM signal with a carrier frequency of
200MHz, the proposed method can achieve -46.24dBc and -54.05dBc
respectively when the coding efficiency reaches 77.51%.