Single-carrier data and multi-carrier reference signals
Methods, systems, and devices for wireless communications are described. A wireless communications device may receive a waveform including both a first waveform comprising an orthogonal frequency division multiplexing (OFDM) waveform and a second waveform comprising a single-carrier waveform via a set of time-frequency resources. The wireless device may decode the first waveform based on receiving the waveform, where the first waveform includes one or more reference signals. The wireless communications device may decode the second waveform based on receiving the waveform and on a time domain equalization filter that is based on decoding the one or more reference signals, where the second waveform comprises a set of data bits. In some examples, the waveform may further include a third waveform including a second OFDM waveform and the wireless communications device may decode the third waveform including one or more second reference signals based on receiving the waveform.
1 . An apparatus for wireless communication, comprising:
one or more processors; and
one or more memories coupled with the processor and storing instructions executable by the one or more processors to cause the apparatus to:
receive a waveform including both a first waveform comprising an orthogonal frequency division multiplexing waveform and a second waveform comprising a single-carrier waveform via a set of time-frequency resources;
decode the first waveform based at least in part on receiving the waveform, wherein the first waveform comprises one or more reference signals; and
decode the second waveform based at least in part on receiving the waveform and on a time domain equalization filter that is based at least in part on decoding the one or more reference signals, wherein the second waveform comprises a set of data bits.
2 . The apparatus of claim 1 , wherein the waveform further includes a third waveform comprising a second orthogonal frequency division multiplexing waveform, and the instructions are further executable by the one or more processors to cause the apparatus to:
decode the third waveform comprising one or more second reference signals based at least in part on receiving the waveform and on a periodicity of the one or more second reference signals.
3 . The apparatus of claim 1 , wherein the second waveform is decoded without pulse shaping.
4 . The apparatus of claim 2 , wherein the instructions to decode the second waveform are executable by the one or more processors to cause the apparatus to:
perform a time offset correction procedure for the waveform based at least in part on the periodicity of the one or more second reference signals.
5 . The apparatus of claim 2 , wherein the one or more second reference signals comprise one or more synchronization signal block reference signals.
6 . The apparatus of claim 1 , wherein the instructions to decode the first waveform are executable by the one or more processors to cause the apparatus to:
descramble the one or more reference signals; and
estimate the time domain equalization filter based at least in part on the descrambled one or more reference signals.
7 . The apparatus of claim 6 , wherein the instructions to determine the time domain equalization filter are executable by the one or more processors to cause the apparatus to:
apply a transform to the descrambled one or more reference signals to estimate the time domain equalization filter.
8 . The apparatus of claim 7 , wherein the transform comprises a fast Fourier transform or an inverse fast Fourier transform.
9 . The apparatus of claim 1 , wherein the one or more reference signals comprise demodulation reference signals.
10 . A method for wireless communication, comprising:
receiving a waveform including both a first waveform comprising an orthogonal frequency division multiplexing waveform and a second waveform comprising a single-carrier waveform via a set of time-frequency resources;
decoding the first waveform based at least in part on receiving the waveform, wherein the first waveform comprises one or more reference signals; and
decoding the second waveform based at least in part on receiving the waveform and on a time domain equalization filter that is based at least in part on decoding the one or more reference signals, wherein the second waveform comprises a set of data bits.
11 . The method of claim 10 , wherein the waveform further includes a third waveform comprising a second orthogonal frequency division multiplexing waveform, the method further comprising:
decoding the third waveform comprising one or more second reference signals based at least in part on receiving the waveform and a periodicity of the one or more second reference signals.
12 . The method of claim 11 , wherein the second waveform is decoded without pulse shaping.
13 . The method of claim 11 , wherein decoding the second waveform comprises:
performing a time offset correction procedure for the waveform based at least in part on the periodicity of the one or more second reference signals.
14 . The method of claim 11 , wherein the one or more second reference signals comprise one or more synchronization signal block reference signals.
15 . The method of claim 10 , wherein decoding the first waveform comprises:
descrambling the one or more reference signals; and
estimating the time domain equalization filter based at least in part on the descrambled one or more reference signals.
16 . The method of claim 15 , wherein determining the time domain equalization filter comprises:
applying a transform to the descrambled one or more reference signals to estimate the time domain equalization filter.
17 . The method of claim 16 , wherein the transform comprises a fast Fourier transform or an inverse fast Fourier transform.
18 . The method of claim 10 , wherein the one or more reference signals comprise demodulation reference signals.