Peak to average power ratio reduction by adding constraints on phase transition between modulation symbols

An apparatus for wireless communication to improve a peak to average power ratio (PAPR) in at least one of a single-carrier frequency division multiplexed (FDM) signal or discrete Fourier transform (DFT) spread orthogonal frequency division multiplexing (OFDM) (DFT-s-OFDM) at a second device, comprising:

• memory;
• and
• at least one processor coupled to the memory and, based at least in part on information stored in the memory, the at least one processor is configured to:
• receive, from a first device, a signal based on a set of modulated symbols;
• receive an indication of a distribution matching function associated with a probability distribution of phase transition magnitudes between states of modulated symbols in the set of modulated symbols;
• and
• derive a set of encoded bits based on the set of modulated symbols using the distribution matching function.

A method, at a first device for wireless communication, to improve a peak to average power ratio (PAPR) in at least one of a single-carrier frequency division multiplexed (FDM) signal or discrete Fourier transform (DFT) spread orthogonal frequency division multiplexing (OFDM) (DFT-s-OFDM), the method comprising:

• encoding a set of information bits with a channel encoder;
• generating, based on a set of encoded bits from the channel encoder, a set of amplitude symbols using a distribution matching function;
• generating a set of modulated symbols based on the set of amplitude symbols, wherein the set of amplitude symbols indicates a set of phases that are used to generate the set of modulated symbols;
• and
• transmitting, to a second device, a signal based on the set of modulated symbols.

A method, at a second device for wireless communication, to improve a peak to average power ratio (PAPR) in at least one of a single-carrier frequency division multiplexed (FDM) signal or discrete Fourier transform (DFT) spread orthogonal frequency division multiplexing (OFDM) (DFT-s-OFDM), the method comprising:

• receiving, from a first device, a signal based on a set of modulated symbols;
• receiving or transmitting an indication of a distribution matching function associated with a probability distribution of phase transition magnitudes between states of modulated symbols in the set of modulated symbols;
• and
• deriving a set of encoded bits based on the set of modulated symbols using the distribution matching function.