Frequency and time domain multiplexing for low peak-to-average power ratio (PAPR) waveform design with multiple streams

An apparatus for wireless communication, comprising:

• means for identifying a plurality of sets of symbols for a transmission in a symbol period, each of the plurality of sets of symbols associated with a different stream;
• means for mapping the plurality of sets of symbols to respective subsets of a plurality of time intervals, wherein a first set of symbols of the plurality of sets of symbols is mapped to the respective subset of the plurality of time intervals with at least one base value;
• means for performing respective time to frequency domain transforms on the plurality of mapped sets of symbols over the respective time to frequency domain transform sizes to obtain a plurality of frequency domain signals;
• means for applying respective frequency domain phase ramps to the plurality of frequency domain signals;
• means for mapping the plurality of phase ramped frequency domain signals to respective subsets of a set of subcarriers;
• means for generating a time domain waveform for the transmission based on a frequency to time domain transform of the mapped plurality of phase ramped frequency domain signals to the set of subcarriers;
• and
• means for transmitting the time domain waveform to a receiver.

An apparatus for wireless communication, in a system comprising:

• a processor;
• memory in electronic communication with the processor;
• and
• instructions stored in the memory and operable, when executed by the processor, to cause the apparatus to:
• identify a plurality of sets of symbols for a transmission in a symbol period, each of the plurality of sets of symbols associated with a different stream;
• map the plurality of sets of symbols to respective subsets of a plurality of time intervals, wherein a first set of symbols of the plurality of sets of symbols is mapped to the respective subset of the plurality of time intervals with at least one base value;
• perform respective time to frequency domain transforms on the plurality of mapped sets of symbols over respective time to frequency domain transform sizes to obtain a plurality of frequency domain signals;
• apply respective frequency domain phase ramps to the plurality of frequency domain signals;
• map the plurality of phase ramped frequency domain signals to respective subsets of a set of subcarriers;
• generate a time domain waveform for the transmission based on a frequency to time domain transform of the mapped plurality of phase ramped frequency domain signals to the set of subcarriers;
• and
• transmit the time domain waveform to a receiver.

A non-transitory computer readable medium storing code for wireless communication, the code comprising instructions executable by a processor to:

• identify a plurality of sets of symbols for a transmission in a symbol period, each of the plurality of sets of symbols associated with a different stream;
• map the plurality of sets of symbols to respective subsets of a plurality of time intervals, wherein a first set of symbols of the plurality of sets of symbols is mapped to the respective subset of the plurality of time intervals with at least one base value;
• perform respective time to frequency domain transforms on the plurality of mapped sets of symbols over respective time to frequency domain transform sizes to obtain a plurality of frequency domain signals;
• apply respective frequency domain phase ramps to the plurality of frequency domain signals;
• map the plurality of phase ramped frequency domain signals to respective subsets of a set of subcarriers;
• generate a time domain waveform for the transmission based on a frequency to time domain transform of the mapped plurality of phase ramped frequency domain signals to the set of subcarriers;
• and
• transmit the time domain waveform to a receiver.