US-20260129633-A1 - POWER CONTROL USING PROBABILISTIC SHAPING

US20260129633A1US 20260129633 A1US20260129633 A1US 20260129633A1US-20260129633-A1

Abstract

Methods, systems, and devices for wireless communication are described. A device (e.g., a UE or a network entity) may generate a first set of bits by performing a probabilistic shaping operation on first information bits using a first shaping parameter associated with a first layer and a second set of bits by performing the probabilistic shaping operation on second information bits using a second shaping parameter associated with a second layer. The device may generate a first set of symbols and a second set of symbols by modulating the first set of bits and the second set of bits using a modulation power scaling factor and transmit the first set of symbols via the first layer and the second set of symbols via the second layer.

Inventors

Wei Yang
Pinar Sen
Kirill IVANOV

Assignees

QUALCOMM INCORPORATED

Dates

Publication Date: 20260507
Application Date: 20241101

Claims (20)

1 . A transmitting device, comprising: one or more memories storing processor-executable code; and one or more processors coupled with the one or more memories and individually or collectively operable to execute the code to cause the transmitting device to: generate a first set of bits by performing a probabilistic shaping operation on first information bits, the probabilistic shaping operation using a first shaping parameter associated with a first layer; generate a second set of bits by performing the probabilistic shaping operation on second information bits, the probabilistic shaping operation using a second shaping parameter associated with a second layer to generate the second set of bits, the first shaping parameter being different than the second shaping parameter; generate a first set of symbols and a second set of symbols by modulating the first set of bits and the second set of bits using a modulation power scaling factor, the first set of symbols corresponding to the first set of bits and the second set of symbols corresponding to the second set of bits; and transmit the first set of symbols via the first layer and the second set of symbols via the second layer.
2 . The transmitting device of claim 1 , wherein performing the probabilistic shaping operation on the first information bits results in the first set of symbols having a non-uniformly distributed constellation.
3 . The transmitting device of claim 1 , wherein the one or more processors are individually or collectively further operable to execute the code to cause the transmitting device to: receive signaling indicating that the first shaping parameter corresponds to the first layer and the second shaping parameter corresponds to the second layer.
4 . The transmitting device of claim 1 , wherein, to generate the first set of symbols using the modulation power scaling factor, the one or more processors are individually or collectively operable to execute the code to cause the transmitting device to: identify the modulation power scaling factor based at least in part on an entropy associated with the first layer being greater than an entropy associated the second layer, wherein the modulation power scaling factor normalizes an average power associated with the first set of symbols for the first layer.
5 . The transmitting device of claim 1 , wherein, to generate the second set of symbols using the modulation power scaling factor, the one or more processors are individually or collectively operable to execute the code to cause the transmitting device to: identify the modulation power scaling factor based at least in part on an entropy associated with the second layer being less than an entropy associated with the first layer, wherein the modulation power scaling factor normalize an average power associated with the second set of symbols for the second layer.
6 . The transmitting device of claim 1 , wherein the modulation power scaling factor normalizes an average power or a summation of power associated with the first set of symbols and the second set of symbols.
7 . The transmitting device of claim 1 , wherein the modulation power scaling factor is based on a modulation order configured for the transmitting device.
8 . The transmitting device of claim 1 , wherein the one or more processors are individually or collectively further operable to execute the code to cause the transmitting device to: transmit a first plurality of reference signals via the first layer using a power level that is based on a power level associated with the first set of symbols; and transmit a second plurality of reference signals via the second layer using a power level that is based on a power level associated with the second set of symbols.
9 . The transmitting device of claim 8 , wherein: the first plurality of reference signals and the second plurality of reference signals comprise demodulation reference signals or phase tracking reference signals.
10 . The transmitting device of claim 1 , wherein the first layer comprises a first spatial layer of a multiple-input multiple-output communication scheme and the second layer comprises a second spatial layer of the multiple-input multiple-output communication scheme.
11 . The transmitting device of claim 1 , wherein the first layer comprises a first subband and the second layer comprises a second subband.
12 . A method for wireless communications at a transmitting device, comprising: generating a first set of bits by performing a probabilistic shaping operation on first information bits, the probabilistic shaping operation using a first shaping parameter associated with a first layer; generating a second set of bits by performing the probabilistic shaping operation on second information bits, the probabilistic shaping operation using a second shaping parameter associated with a second layer to generate the second set of bits, the first shaping parameter being different than the second shaping parameter; generating a first set of symbols and a second set of symbols by modulating the first set of bits and the second set of bits using a modulation power scaling factor, the first set of symbols corresponding to the first set of bits and the second set of symbols corresponding to the second set of bits; and transmitting the first set of symbols via the first layer and the second set of symbols via the second layer.
13 . The method of claim 12 , wherein performing the probabilistic shaping operation on the first information bits results in the first set of symbols having a non-uniformly distributed constellation.
14 . The method of claim 12 , further comprising: receiving signaling indicating that the first shaping parameter corresponds to the first layer and the second shaping parameter corresponds to the second layer.
15 . The method of claim 12 , wherein generating the first set of symbols using the modulation power scaling factor comprises: identifying the modulation power scaling factor based at least in part on an entropy associated with the first layer being greater than an entropy associated the second layer, wherein the modulation power scaling factor normalizes an average power associated with the first set of symbols for the first layer.
16 . The method of claim 12 , wherein generating the second set of symbols using the modulation power scaling factor comprises: identifying the modulation power scaling factor based at least in part on an entropy associated with the second layer being less than an entropy associated with the first layer, wherein the modulation power scaling factor normalize an average power associated with the second set of symbols for the second layer.
17 . The method of claim 12 , wherein the modulation power scaling factor normalizes an average power or a summation of power associated with the first set of symbols and the second set of symbols.
18 . The method of claim 12 , wherein the modulation power scaling factor is based on a modulation order configured for the transmitting device.
19 . The method of claim 12 , further comprising: transmitting a first plurality of reference signals via the first layer using a power level that is based on a power level associated with the first set of symbols; and transmitting a second plurality of reference signals via the second layer using a power level that is based on a power level associated with the second set of symbols.
20 . The method of claim 19 , wherein the first plurality of reference signals and the second plurality of reference signals comprise demodulation reference signals or phase tracking reference signals.

Description

FIELD OF TECHNOLOGY The following relates to wireless communication, including power control using probabilistic shaping. BACKGROUND Wireless communications systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadcast, and so on. These systems may be capable of supporting communication with multiple users by sharing the available system resources (e.g., time, frequency, and power). Examples of such multiple-access systems include fourth generation (4G) systems such as Long Term Evolution (LTE) systems, LTE-Advanced (LTE-A) systems, or LTE-A Pro systems, and fifth generation (5G) systems which may be referred to as New Radio (NR) systems. These systems may employ technologies such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal FDMA (OFDMA), or discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-S-OFDM). A wireless multiple-access communications system may include one or more base stations, each supporting wireless communication for communication devices, which may be known as user equipment (UE). In some examples, a device (e.g., a UE or a network entity) may implement a power control scheme to optimize power allocated to different layers (e.g., spatial layers) supported by the device. SUMMARY The systems, methods, and devices of this disclosure each have several innovative aspects, no single one of which is solely responsible for the desirable attributes disclosed herein. A method for wireless communications by a transmitting device is described. The method may include generating a first set of bits by performing a probabilistic shaping operation on first information bits, the probabilistic shaping operation using a first shaping parameter associated with a first layer, generating a second set of bits by performing the probabilistic shaping operation on second information bits, the probabilistic shaping operation using a second shaping parameter associated with a second layer to generate the second set of bits, the first shaping parameter being different than the second shaping parameter, generating a first set of symbols and a second set of symbols by modulating the first set of bits and the second set of bits using a modulation power scaling factor, the first set of symbols corresponding to the first set of bits and the second set of symbols corresponding to the second set of bits, and transmitting the first set of symbols via the first layer and the second set of symbols via the second layer. A transmitting device for wireless communications is described. The transmitting device may include one or more memories storing processor executable code, and one or more processors coupled with the one or more memories. The one or more processors may individually or collectively be operable to execute the code to cause the transmitting device to generate a first set of bits by performing a probabilistic shaping operation on first information bits, the probabilistic shaping operation using a first shaping parameter associated with a first layer, generate a second set of bits by performing the probabilistic shaping operation on second information bits, the probabilistic shaping operation using a second shaping parameter associated with a second layer to generate the second set of bits, the first shaping parameter being different than the second shaping parameter, generate a first set of symbols and a second set of symbols by modulating the first set of bits and the second set of bits using a modulation power scaling factor, the first set of symbols corresponding to the first set of bits and the second set of symbols corresponding to the second set of bits, and transmit the first set of symbols via the first layer and the second set of symbols via the second layer. Another transmitting device for wireless communications is described. The transmitting device may include means for generating a first set of bits by performing a probabilistic shaping operation on first information bits, the probabilistic shaping operation using a first shaping parameter associated with a first layer, means for generating a second set of bits by performing the probabilistic shaping operation on second information bits, the probabilistic shaping operation using a second shaping parameter associated with a second layer to generate the second set of bits, the first shaping parameter being different than the second shaping parameter, means for generating a first set of symbols and a second set of symbols by modulating the first set of bits and the second set of bits using a modulation power scaling factor, the first set of symbols corresponding to the first set of bits and the second set of symbols corresponding to the second set of bits, and means for transmitting the first set of symbols via the first layer and the second set of symbols via the second lay