System and method for DL transmission with low peak-to-average-power (PAPR)

1. A base station (BS) for wireless communication in a frequency band, the BS comprising:

processor circuitry configured to:

precode, in a frequency domain, a plurality of physical channel signals according to predetermined codes using a code length;

multiplex the precoded plurality of physical channel signals;

map the multiplexed precoded plurality of physical channel signals to subcarriers in the frequency band; and

generate a time domain waveform based on the mapped multiplexed precoded plurality of physical channel signals; and

a transmitter to transmit the time domain waveform to a user equipment (UE),

wherein the code length is selected based on a length of an entire signal of the multiplexed precoded plurality of physical channel signals.

2. The BS of claim 1 , wherein the plurality of physical channel signals include at least one of a Physical Downlink Shared Channel (PDSCH) signal, a Physical Downlink Control Channel (PDCCH) signal, or a Channel State Information Reference Signal (CSI-RS).

3. The BS of claim 1 , wherein at least two of the plurality of physical channel signals have a common signal type.

4. The BS of claim 1 , wherein at least two of the plurality of physical channel signals have a different signal type.

5. The BS of claim 1 , wherein the multiplexing the precoded plurality of physical channel signals includes a block concatenation of the plurality of physical channel signals.

6. The BS of claim 1 , wherein the multiplexing the precoded plurality of physical channel signals includes a sub-block concatenation of the plurality of physical channel signals.

7. The BS of claim 1 , wherein the time domain waveform further includes a downlink control information (DCI) signal, a medium access control (MAC) signal or a radio resource control (RRC) signal.

8. The BS of claim 1 , wherein the BS is a next-generation NodeB (gNB).

9. A method of wireless communication in a frequency band, the method comprising:

precoding, in a frequency domain, a plurality of physical channel signals according to predetermined codes with a code length;

multiplexing the precoded plurality of physical channel signals;

mapping the multiplexed precoded plurality of physical channel signals to subcarriers in the frequency band;

generating a time domain waveform based on the mapped multiplexed precoded plurality of physical channel signals; and

transmitting the time domain waveform to a user equipment (UE),

wherein the code length is selected based on a length of an entire signal of the multiplexed plurality of physical channel signals.

10. The method of claim 9 , wherein the plurality of physical channel signals include at least one of a Physical Downlink Shared Channel (PDSCH) signal, a Physical Downlink Control Channel (PDCCH) signal, or a Channel State Information Reference Signal (CSI-RS).

11. The method of claim 9 , wherein at least two of the plurality of physical channel signals have a common signal type.

12. The method of claim 9 , wherein at least two of the plurality of physical channel signals have a different signal type.

13. The method of claim 9 , wherein the multiplexing the precoded plurality of physical channel signals includes using a block concatenation of the plurality of physical channel signals.

14. The method of claim 9 , wherein the multiplexing the precoded plurality of physical channel signals includes using a sub-block concatenation of the plurality of physical channel signals.

15. The method of claim 9 , wherein the time domain waveform further includes a downlink control information (DCI) signal, a medium access control (MAC) signal or a radio resource control (RRC) signal.

16. The method of claim 9 , wherein the precoding, the multiplexing, the mapping, the generating and the transmitting are performed by a base station (BS).

17. A non-transitory computer-readable media comprising instructions to cause an electronic device, upon execution of the instructions by one or more processors of the electronic device, to perform operations, the operations comprising:

precoding, in a frequency domain, a plurality of physical channel signals according to predetermined codes with a code length;

multiplexing the precoded plurality of physical channel signals;

mapping the multiplexed precoded plurality of physical channel signals to subcarriers in the frequency band;

generating a time domain waveform based on the mapped multiplexed precoded plurality of physical channel signals; and

transmitting the time domain waveform to a user equipment (UE),

wherein the code length is selected based on a length of an entire signal of the multiplexed plurality of physical channel signals.

18. The non-transitory computer-readable media of claim 17 , wherein the plurality of physical channel signals include at least one of a Physical Downlink Shared Channel (PDSCH) signal, a Physical Downlink Control Channel (PDCCH) signal, or a Channel State Information Reference Signal (CSI-RS).

19. The non-transitory computer-readable media of claim 17 , wherein the multiplexing the precoded plurality of physical channel signals includes using a block concatenation of the plurality of physical channel signals.

20. The non-transitory computer-readable media of claim 17 , wherein the multiplexing the precoded plurality of physical channel signals includes using a sub-block concatenation of the plurality of physical channel signals.