Multiple-port phase change estimation reference signals for discrete Fourier transform-spread orthogonal frequency-division multiplexing (DFT-S-OFDM) transmissions

A method for wireless communications, comprising:

• multiplexing one or more phase change estimation reference signals with a set of data symbols in a time domain, wherein the one or more phase change estimation reference signals are associated with one or more sets of reference signal groups, and wherein a plurality of ports for transmitting the one or more phase change estimation reference signals are associated with an orthogonal cover code and a first set of reference signal groups of the one or more sets of reference signal groups or are associated with respective sets of reference signal groups of the one or more sets of reference signal groups, the respective sets of reference signal groups corresponding to at least a first time-division multiplexing (TDM) set and a second TDM set different from the first TDM set;
• performing transform precoding on the set of data symbols and the one or more phase change estimation reference signals using a discrete Fourier transform (DFT);
• and
• transmitting a message comprising the set of data symbols during two or more slots, wherein each slot of the two or more slots comprises the set of data symbols, the one or more phase change estimation reference signals, and one or more demodulation reference signals, wherein at least one port of the plurality of ports is used for transmitting the one or more phase change estimation reference signals, and wherein the message comprises a DFT-spread orthogonal frequency-division multiplexing (DFT-s-OFDM) waveform based at least in part on the transform precoding.

A wireless communication device, comprising:

• means for multiplexing one or more phase change estimation reference signals with a set of data symbols in a time domain, wherein the one or more phase change estimation reference signals are associated with one or more sets of reference signal groups, and wherein a plurality of ports for transmitting the one or more phase change estimation reference signals are associated with an orthogonal cover code and a first set of reference signal groups of the one or more sets of reference signal groups or are associated with respective sets of reference signal groups of the one or more sets of reference signal groups, the respective sets of reference signal groups corresponding to at least a first time-division multiplexing (TDM) set and a second TDM set different from the first TDM set;
• means for performing transform precoding on the set of data symbols and the one or more phase change estimation reference signals using a discrete Fourier transform (DFT);
• and
• means for transmitting a message comprising the set of data symbols during two or more slots, wherein each slot of the two or more slots comprises the set of data symbols, the one or more phase change estimation reference signals, and one or more demodulation reference signals, wherein at least one port of the plurality of ports is used for transmitting the one or more phase change estimation reference signals, and wherein the message comprises a DFT-spread orthogonal frequency-division multiplexing (DFT-s-OFDM) waveform based at least in part on the transform precoding.

A non-transitory computer-readable medium storing code for wireless communications, the code comprising instructions executable by one or more processors to:

• multiplex one or more phase change estimation reference signals with a set of data symbols in a time domain, wherein the one or more phase change estimation reference signals are associated with one or more sets of reference signal groups, and wherein a plurality of ports for transmitting the one or more phase change estimation reference signals are associated with an orthogonal cover code and a first set of reference signal groups of the one or more sets of reference signal groups or are associated with respective sets of reference signal groups of the one or more sets of reference signal groups, the respective sets of reference signal groups corresponding to at least a first time-division multiplexing (TDM) set and a second TDM set different from the first TDM set;
• perform transform precoding on the set of data symbols and the one or more phase change estimation reference signals using a discrete Fourier transform (DFT);
• and
• transmit a message comprising the set of data symbols during two or more slots, wherein each slot of the two or more slots comprises the set of data symbols, the one or more phase change estimation reference signals, and one or more demodulation reference signals, wherein at least one port of the plurality of ports is used for transmitting the one or more phase change estimation reference signals, and wherein the message comprises a DFT-spread orthogonal frequency-division multiplexing (DFT-s-OFDM) waveform based at least in part on the transform precoding.