Operation method of sidelink terminal related to constellation shift in wireless communication system
According to an embodiment, an operation method of a terminal in a wireless communication system comprises the steps of: generating a first waveform from a signal related to a physical sidelink control channel (PSCCH) and generating a second waveform from a signal related to a physical sidelink shared channel (PSSCH); generating a third waveform on the basis of a peak to average power ratio (PAPR) and a constellation shift and transmitting the second waveform and the third waveform, wherein the constellation shift is applied only to the first waveform.
1. A method for operating a user equipment (UE) in a wireless communication system comprising:
modulating first bit sequences related to a data channel and second bit sequences related to a control channel,
generating a second waveform related to the data channel and a third waveform related to the control channel; and
transmitting the second waveform and the third waveform,
wherein the third waveform is generated from a first waveform related to the control channel and the second waveform, based on PAPR (Peak to Average Power Ratio) and movement of constellation,
wherein the movement of the constellation is applied only to the first waveform based on that a PAPR calculated by a sum of the first waveform and the second waveform being greater than a threshold value.
2. The method according to claim 1 , wherein the second waveform and the third waveform are transmitted based on that the PAPR calculated by a sum of the third waveform and the second waveform is smaller than the threshold value.
3. The method according to claim 1 , wherein the movement of the constellation changes at least one of a phase and power of the first waveform.
4. The method according to claim 3 , wherein the movement of the constellation satisfies a minimum distance between QAM symbols.
5. The method according to claim 1 , wherein the operating method is applied only to symbols obtained by multiplexing of the control channel and the data channel.
6. The method according to claim 1 , wherein the movement of the constellation is allowed within a range in which power increasing by the movement of the constellation does not exceed a predetermined power value.
7. The method according to claim 1 , wherein when power increasing by the movement of the constellation is smaller than the predetermined power value, transmission power is boosted as much as the predetermined power value.
8. The method according to claim 1 , wherein the user equipment (UE) is configured to use a predetermined transmission power regardless of power increasing by the movement of the constellation.
9. The method according to claim 1 , wherein the first waveform is obtained by performing Inverse Fast Fourier Transform (IFFT) of a signal related to the control channel; and
the second waveform is obtained by performing Inverse Fast Fourier Transform (IFFT) of a signal related to the control channel.
10. A device for use in a wireless communication system comprising:
at least one processor; and
at least one memory operatively connected to the at least one processor, and configured to store instructions such that the at least one processor performs specific operations by executing the instructions,
wherein the specific operations include:
modulating first bit sequences related to a data channel and second bit sequences related to a control channel,
generating a second waveform related to the data channel and a third waveform related to the control channel; and
transmitting the second waveform and the third waveform,
wherein the third waveform is generated from a first waveform related to the control channel and the second waveform related to the data channel, based on PAPR (Peak to Average Power Ratio) and movement of constellation,
wherein the movement of the constellation is applied only to the first waveform based on that a PAPR calculated by a sum of the first waveform and the second waveform being greater than a threshold value.
11. The device according to claim 10 , wherein the second waveform and the third waveform are transmitted based on that the PAPR calculated by a sum of the third waveform and the second waveform is smaller than the threshold value.
12. The device according to claim 10 , wherein the movement of the constellation changes at least one of a phase and power of the first waveform.
13. The device according to claim 10 , wherein the device is configured to communicate with at least one of another terminal, a terminal related to an autonomous vehicle, a base station (BS), and a network.