Patent Application

App. No. 18/338,425

Abstract

Claims (26)

1 . A method for reducing peak-to-average power ratio (PAPR) of a multi-layer precoder matrix (PM)-combined demodulation reference signal (DMRS) symbol in a 5G New Radio (NR) transmission involving a radio access network (RAN), the method comprising: one of:

a) performing, at a distributed unit (DU) of the RAN, a modified orthogonal cover code (M-OCC) method to reduce the PAPR of the multi-layer PM-combined DMRS, wherein the M-OCC method comprises;

i. multiplying a PM with a specified multiplication factor in frequency domain to obtain a modified PM, and

ii. subsequently multiplying at least one of multiple downlink (DL) layers with the modified PM; or

b) performing, at a distributed unit (DU) of the RAN, a modified cyclic delay diversity (M-CDD) method to reduce the PAPR of the multi-layer PM-combined DMRS, wherein the M-CCD method comprises;

i. multiplying at least one of multiple frequency-domain downlink (DL) layers with a specified linear phase shift to obtain phase-shifted DL layers, and

ii. subsequently multiplying the phase-shifted DL layers with the PM.

2 . The method according to claim 1 , wherein the M-OCC method is performed for three DL layers comprising layer 0, layer 1 and layer 2.

3 . The method according to claim 2 , wherein the specified multiplication factor is applied to layer 2.

4 . The method according to claim 3 , wherein the value of b is one of −1 and 1.

5 . The method according to claim 4 , wherein i) the value of b is −1 for a precoder resource group (PRG) length of 2 physical resource blocks (PRBs), and ii) the value of b is 1 for a PRG length of 4 PRBs.

6 . The method according to claim 3 , wherein the layer 0 and the layer 1 are not multiplied by the specified multiplication factor.

7 . The method according to claim 1 , wherein the M-OCC method is performed for four DL layers comprising layer 0, layer 1, layer 2, and layer 3.

8 . The method according to claim 7 , wherein a specified multiplication factor is applied to layer 3.

9 . The method according to claim 8 , wherein the specified multiplication factor is −1.

10 . The method according to claim 8 , wherein the layer 0, the layer 1, and the layer 2 are not multiplied by the specified multiplication factor.

11 . The method according to claim 1 , wherein the M-CCD method is performed for three DL layers comprising layer 0, layer 1 and layer 2.

12 . The method according to claim 11 , wherein slope of the specified linear phase shift in frequency domain translates to a cyclic delay in time-domain.

13 . The method according to claim 12 , wherein the cyclic delay “d” can range from 0 to the symbol length N-1, and wherein N represents the number of resource elements (REs).

14 . The method according to claim 11 , wherein the layer-2 is multiplied with the specified linear phase shift.

15 . The method according to claim 14 , wherein the layer-0 and the layer-1 are not multiplied by the specified linear phase shift.

16 . The method according to claim 15 , wherein the specified phase shift is applied to a specified number of resource elements (REs) based on a precoder resource group (PRG) length.

17 . The method according to claim 11 , wherein the M-CCD method is performed for four DL layers comprising layer 0, layer 1, layer 2, and layer 3.

18 . The method according to claim 17 , wherein the layer-2 and the layer-3 are multiplied by the specified linear phase shift for all symbol physical resource blocks (PRBs).

19 . The method according to claim 17 , wherein the layer-0 and the layer-1 are not multiplied by the specified linear phase shift.

20 . The method according to claim 19 , wherein the specified phase shift is applied to a specified number of resource elements (REs) based on a precoder resource group (PRG) length.

Assignments (13)