EDGE transmitter alternative using nonlinear polar modulation

CMOS RF Power Amplifiers for Mobile Communications

“…The reason for this is the nonlinear relationship between these signals and the in-phase and quadrature signals x(t) and y(t) [17]:…”

Precise Delay Alignment Between Amplitude and Phase/Frequency Modulation Paths in a Digital Polar Transmitter

“…Additionally, the new architecture would be highly reconfigurable with analog blocks that are controlled by software to guarantee the best achievable performance and parametric yield. Another benefit of the new architecture would be easy migration from one process node to the next without significant rework [8,9]. Figure 4.2 illustrates an application of the new paradigm to an RF wireless transmitter performing an arbitrary quadrature amplitude modulation (QAM).…”

“…The phase modulation is accomplished by injecting the phase information into the ADPLL, whereas the amplitude modulation path is quite different, further complicated by the need for power control and spectral replica mitigation. To reproduce the frequency-translated source I/Q data at the antenna port, such path delays in phase and amplitude paths of the transmitter must be matched properly [9,13].…”

Polarization division multiple access with polarization modulation for LOS wireless communications

“…Recently, some designs based on polarization are researched and developed [24][25][26][27][28][29][30][31], such as polar modulation in the enhance data rates for global evolution (EDGE) system focusing on overcoming the problems of high power consumption, low efficiency, excessive heat and short battery life due to the requirement of linear power amplifier when adopting 3π 8 -8PSK modulation technique. In the exiting polar modulation introduced into EDGE, the orthogonal output from I/Q channels is transformed into the polarization format, i.e., one is the amplitude component and the other is the phase component before being sent to the transmitter, as shown in Figure 1.…”