In peak-to-average power ratio reduction and processing efficiency for hybrid/digital signals

An apparatus comprising:

• a modulator to produce a modulated orthogonal frequency division multiplexed (OFDM) symbol;
• a processor to perform iterations of a peak-to-average ratio (PAR) reduction algorithm on the modulated OFDM symbol to produce a final PAR-reduced modulated OFDM symbol, the processor configured to perform, for each of the iterations:
• clipping the modulated OFDM symbol to produce a clipped modulated OFDM symbol, and subtracting the clipped modulated OFDM symbol from the modulated OFDM symbol to produce a difference signal;
• weighting the difference signal using a weight that varies across the iterations, to produce a weighted difference signal that varies across the iterations, wherein the weight is determined using a function based on a current number of iterations “i” and a total number of iterations “N”;
• subtracting the weighted difference signal from the modulated OFDM symbol to produce a modified modulated OFDM symbol;
• and
• performing further PAR reduction operations on the modified modulated OFDM symbol to produce a PAR-reduced OFDM symbol for a next iteration;
• and
• an amplifier to transmit the final PAR-reduced modulated OFDM symbol.

A method comprising:

• performing iterations of a peak-to-average ratio (PAR) reduction algorithm, each of the iterations including:
• combining a modulated orthogonal frequency division multiplexed (OFDM) symbol and a modulated frequency modulation (FM) segment to produce a modulated hybrid symbol;
• clipping the modulated hybrid symbol to produce a clipped modulated hybrid symbol;
• obtaining a difference signal between the modulated hybrid symbol and the clipped modulated hybrid symbol;
• weighting the difference signal using a weight that varies across the iterations, to produce a weighted difference signal that varies across the iterations, wherein the weight is determined using a function based on a current number of iterations “i” and a total number of iterations “N”;
• subtracting the weighted difference signal from the modulated OFDM symbol to produce a modified modulated OFDM symbol;
• and
• performing further PAR reduction operations on the modified modulated OFDM symbol and the modulated FM segment to produce a PAR-reduced OFDM symbol for use in a next iteration.