Methods and devices for frequency modulation reduction for polar transmitters

A transmission method for a polar transmitter operating in a wireless communication network, the transmission method comprising:

• converting baseband complex data into a magnitude component and a phase component;
• determining a phase selection for each respective phase of the phase component based on selecting from a plurality of configured phase selections;
• generating a phase select parameter and a modified phase for each respective phase based on the phase selection determined for each respective phase;
• generating a clock signal with a frequency corresponding to the modified phase;
• generating a set of clock signals, the set of clock signals including the clock signal and one or more shifted clock signals with a shift in phase relative to the clock signal;
• selecting an input clock signal from the set of clock signals, wherein the input clock signal is selected based on the phase select parameter;
• driving a Power Amplifier (PA), utilizing a representation of the magnitude component and utilizing the input clock signal, to generate a radio frequency (RF) signal;
• and
• transmitting the RF signal on a wireless medium.

A polar transmitter transmitting a Radio Frequency (RF) signal in a wireless communication network, the polar transmitter comprising:

• a cartesian to polar conversion module configured to generate a magnitude component and a phase component from baseband complex data received as an input;
• a frequency modulation (FM) reduction module configured to determine a phase selection for each respective phase of the phase component based on selecting from a plurality of configured phase selections, and further configured to generate a phase select parameter, a modified phase, and a sign parameter for each respective phase based on the phase selection for the respective phase;
• a Phase Lock Loop (PLL) configured to receive the modified phase and generate a clock signal with a frequency based on the modified phase;
• a quadrature generator configured to receive the clock signal from the PLL and generate a shifted clock signal based on applying a phase shift to the clock signal;
• an Amplitude Modulation (AM) module configured to generate a signed magnitude component based on the magnitude component from the cartesian to polar conversion module and the sign parameter from the FM reduction module, the sign parameter indicative of a positive or negative sign for the magnitude component;
• a phase select multiplexer configured to receive the phase select parameter from the FM reduction module and the signed magnitude component from the AM module, wherein the phase select multiplexer generates an in-phase (I) input and a quadrature (Q) input based on the phase select parameter and the signed magnitude component;
• and
• a Power Amplifier (PA), coupled to the phase select multiplexer and the quadrature generator, wherein the PA is driven to generate the RF signal utilizing one or more of the I input or Q input according to one or more of the clock signal or the shifted clock signal received from the quadrature generator.