Pilot design for uplink (UL) narrow-band internet of things (NB-IoT)

A method for wireless communications by a base station, comprising:

• determining at least one code sequence for use for a demodulation reference signal (DMRS) for a channel transmitted, by a user equipment (UE), across one or more subframes within a bandwidth of a resource block (RB) allocated to the UE for communication, wherein the at least one code sequence for use for the DMRS is determined based at least in part on a product of a Hadamard sequence and a random sequence, wherein a length of the at least one code sequence for use for the DMRS depends, at least in part, on a bundling length of the channel;
• and
• monitoring during the one or more subframes for the channel including the DMRS.

An apparatus for wireless communications by a user equipment (UE), comprising:

• means for determining at least one code sequence for use for a demodulation reference signal (DMRS) for a channel transmitted across one or more subframes within a bandwidth of a resource block (RB) allocated to the UE for communication, wherein the at least one code sequence for use for the DMRS is determined based at least in part on a product of a Hadamard sequence and a random sequence, wherein a length of the at least one code sequence for use for the DMRS depends, at least in part, on a bundling length of the channel;
• and
• means for transmitting the channel including the DMRS.

An apparatus for wireless communications by a base station, comprising:

• means for determining at least one code sequence for use for a demodulation reference signal (DMRS) for a channel transmitted, by a user equipment (UE), across one or more subframes within a bandwidth of a resource block (RB) allocated to the UE for communication, wherein the at least one code sequence for use for the DMRS is determined based at least in part on a product of a Hadamard sequence and a random sequence, wherein a length of the at least one code sequence for use for the DMRS depends, at least in part, on a bundling length of the channel;
• and
• means for monitoring during the one or more subframes for the channel including the DMRS.

A non-transitory computer-readable medium for wireless communication by a user equipment (UE), the non-transitory computer-readable medium comprising code, which when executed by at least one processor, causes the at least one processor to:

• determine at least one code sequence for use for a demodulation reference signal (DMRS) for a channel transmitted across one or more subframes within a bandwidth of a resource block (RB) allocated to the UE for communication, wherein the at least one code sequence for use for the DMRS is determined based at least in part on a product of a Hadamard sequence and a random sequence, wherein a length of the at least one code sequence for use for the DMRS depends, at least in part, on a bundling length of the channel;
• and
• transmit the channel including the DMRS.

A non-transitory computer-readable medium for wireless communication by a base station, the non-transitory computer-readable medium comprising code, which when executed by at least one processor, causes the at least one processor to:

• determine at least one code sequence for use for a demodulation reference signal (DMRS) for a channel transmitted, by a user equipment (UE), across one or more subframes within a bandwidth of a resource block (RB) allocated to the UE for communication, wherein the at least one code sequence for use for the DMRS is determined based at least in part on a product of a Hadamard sequence and a random sequence, wherein a length of the at least one code sequence for use for the DMRS depends, at least in part, on a bundling length of the channel;
• and
• monitor during the one or more subframes for the channel including the DMRS.