Subframe structure for discrete fourier transform (dft) spread orthogonal frequency division multiplexing (s-ofdm) waveforms

An apparatus of a base station operable to encode guard interval (GI) discrete Fourier transform (DFT) spread orthogonal frequency-division multiplexing (OFDM) (GI-DFT-s-OFDM) data symbols for transmission to a user equipment (UE), the base station comprising:

• one or more processors configured to:
• identify, at the base station, GI-DFT-s-OFDM data symbols for transmission to the UE;
• and
• encode, at the base station, the GI-DFT-s-OFDM data symbols for transmission to the UE in a subframe, wherein the subframe is in accordance with a flexible subframe structure that begins with a demodulation reference signal (DMRS) sequence followed by a GI sequence in a first symbol of the subframe, and further comprises one or more subsequent symbols in the subframe that each include a GI-DFT-s-OFDM data symbol followed by a GI sequence;
• and
• a memory interface configured to retrieve from a memory the GI-DFT-s-OFDM data symbols for transmission to the UE.

An apparatus of a user equipment (UE) operable to decode guard interval (GI) discrete Fourier transform (DFT) spread orthogonal frequency-division multiplexing (OFDM) (GI-DFT-s-OFDM) data symbols received from a base station, the UE comprising:

• one or more processors configured to:
• decode, at the UE, the GI-DFT-s-OFDM data symbols received from the base station in a subframe, wherein the subframe is in accordance with a flexible subframe structure that includes a demodulation reference signal (DMRS) sequence followed by a GI sequence in a first symbol of the subframe, and further comprises one or more subsequent symbols in the subframe that each include a GI-DFT-s-OFDM data symbol followed by a GI sequence;
• and
• perform, at the UE, a time domain channel estimation based on the DMRS sequence included in the subframe;
• and
• a memory interface configured to send to a memory the GI-DFT-s-OFDM data symbols received from the base station.