WO-2026090960-A1 - SUPPORTING PROBABILISTIC AMPLITUDE SHAPING (PAS) WITH LOWER CHANNEL CODING RATE

WO2026090960A1WO 2026090960 A1WO2026090960 A1WO 2026090960A1WO-2026090960-A1

Abstract

A method for wireless communication process includes performing an amplitude shaping encoding on a set of information bits to generate shaped information bits. Additionally, systematic encoding is performed on the shaped information bits and unshaped information bits to generate parity bits. The method also includes mapping the shaped, unshaped, and parity bits to a set of quadrature amplitude modulation (QAM) symbols. The mapping process maps: at least a subset of shaped bits to respective amplitude bits in a first subset of QAM symbols; at least a first subset of unshaped bits to respective amplitude bits in a second subset of QAM symbols; and at least a subset of parity bits to respective sign bits in the first and second subsets of QAM symbols and to respective amplitude bits in the second subset of QAM symbols. The method also includes transmitting the set of QAM symbols in accordance with the mapping.

Inventors

SEN, PINAR
YANG, WEI
IVANOV, KIRILL
LIU, WEI

Assignees

QUALCOMM INCORPORATED

Dates

Publication Date: 20260507
Application Date: 20241031

Claims (20)

A method of wireless communication at a wireless device, comprising: performing an amplitude shaping encoding operation on a set of information bits of a code block, the amplitude shaping encoding operation generating a set of shaped information bits; performing a systematic encoding operation on the set of shaped information bits and on a set of unshaped information bits of the code block, the systematic encoding operation generating a set of parity bits; mapping the set of shaped information bits, the set of unshaped information bits, and the set of parity bits to a set of quadrature amplitude modulation (QAM) symbols, each respective QAM symbol being associated with a sign bit and a set of amplitude bits, the mapping comprising: mapping at least a first subset of shaped bits of the set of shaped bits to respective amplitude bits in a first subset of QAM symbols of the set of QAM symbols; mapping at least a first subset of unshaped bits of the set of unshaped bits to respective amplitude bits in a second subset of QAM symbols of the set of QAM symbols, a quantity of QAM symbols in the second subset of QAM symbols being a function of at least a quantity of QAM symbols in the set of QAM symbols, a channel coding rate for the code block, and a modulation order associated with the set of QAM symbols; and mapping at least a first subset of parity bits of the set of parity bits to respective sign bits in the first and the second subsets of QAM symbols and to respective amplitude bits in the second subset of QAM symbols of the set of QAM symbols; and transmitting the set of QAM symbols in accordance with mapping the set of shaped information bits, the set of unshaped information bits, and the set of parity bits.
The method of claim 1, wherein: no unshaped bits of the set of unshaped bits are mapped to amplitude bits associated with the first subset of QAM symbols; no shaped bits of the set of shaped bits are mapped to amplitude bits associated with the second subset of QAM symbols; and no parity bits of the set of parity bits are mapped to amplitude bits associated with the first subset of QAM symbols.
The method of claim 2, wherein a quantity of QAM symbols in the second subset of QAM symbols is further the function of a quantity of punctured amplitude bits in the set of QAM symbols.
The method of claim 1, further comprising mapping a second subset of shaped bits of the set of shaped bits to respective amplitude bits in the second subset of QAM symbols of the set of QAM symbols, wherein no bits of the set of unshaped bits are mapped to the first subset of QAM symbols.
The method of claim 4, wherein a quantity of QAM symbols in the second subset of QAM symbols is further the function of a quantity of punctured amplitude bits in the set of QAM symbols.
The method of claim 1, further comprising: mapping a second subset of shaped bits of the set of shaped bits to respective amplitude bits in the second subset of QAM symbols of the set of QAM symbols; mapping a second subset of unshaped bits of the set of unshaped bits to respective amplitude bits in the first subset of QAM symbols of the set of QAM symbols; and mapping a second subset the set of parity bits to respective amplitude bits in the first subset of QAM symbols of the set of QAM symbols, wherein a first quantity of the first subset of unshaped bits is greater than a second quantity of the second subset of unshaped bits.
The method of claim 6, wherein a quantity of QAM symbols in the second subset of QAM symbols is further the function of one or more of a quantity of punctured amplitude bits in the set of QAM symbols, a quantity of the first subset of shaped bits, or a quantity of the second subset of shaped bits.
A wireless communication device, comprising: one or more processors; and one or more memories coupled with the one or more processors and storing processor-executable code that, when executed by the one or more processors, is configured to cause the wireless communication device to: perform an amplitude shaping encoding operation on a set of information bits of a code block, the amplitude shaping encoding operation generating a set of shaped information bits; perform a systematic encoding operation on the set of shaped information bits and on a set of unshaped information bits of the code block, the systematic encoding operation generating a set of parity bits; map the set of shaped information bits, the set of unshaped information bits, and the set of parity bits to a set of quadrature amplitude modulation (QAM) symbols, each respective QAM symbol being associated with a sign bit and a set of amplitude bits, the mapping comprising: mapping at least a first subset of shaped bits of the set of shaped bits to respective amplitude bits in a first subset of QAM symbols of the set of QAM symbols; mapping at least a first subset of unshaped bits of the set of unshaped bits to respective amplitude bits in a second subset of QAM symbols of the set of QAM symbols, a quantity of QAM symbols in the second subset of QAM symbols being a function of at least a quantity of QAM symbols in the set of QAM symbols, a channel coding rate for the code block, and a modulation order associated with the set of QAM symbols; and map at least a first subset of parity bits of the set of parity bits to respective sign bits in the first and the second subsets of QAM symbols and to respective amplitude bits in the second subset of QAM symbols of the set of QAM symbols; transmit the set of QAM symbols in accordance with the mapping of the set of shaped information bits, the set of unshaped information bits, and the set of parity bits.
The wireless communication device of claim 8, wherein: no unshaped bits of the set of unshaped bits are mapped to amplitude bits associated with the first subset of QAM symbols; no shaped bits of the set of shaped bits are mapped to amplitude bits associated with the second subset of QAM symbols; and no parity bits of the set of parity bits are mapped to amplitude bits associated with the first subset of QAM symbols.
The wireless communication device of claim 9, wherein a quantity of QAM symbols in the second subset of QAM symbols is further a function of a quantity of punctured amplitude bits in the set of QAM symbols.
The apparatus of claim 8, wherein execution of the processor-executable code further cause the apparatus to map a second subset of shaped bits of the set of shaped bits to respective amplitude bits in the second subset of QAM symbols of the set of QAM symbols, wherein no bits of the set of unshaped bits are mapped to the first subset of QAM symbols.
The apparatus of claim 11, wherein a quantity of QAM symbols in the second subset of QAM symbols is further a function of a quantity of punctured amplitude bits in the set of QAM symbols.
The apparatus of claim 8, wherein execution of the processor-executable code further cause the apparatus to: map a second subset of shaped bits of the set of shaped bits to respective amplitude bits in the second subset of QAM symbols of the set of QAM symbols; map a second subset of unshaped bits of the set of unshaped bits to respective amplitude bits in the first subset of QAM symbols of the set of QAM symbols; and map a second subset of the set of parity bits to respective amplitude bits in the first subset of QAM symbols of the set of QAM symbols, wherein a first quantity of the first subset of unshaped bits is greater than a second quantity of the second subset of unshaped bits.
The apparatus of claim 13, wherein a quantity of QAM symbols in the second subset of QAM symbols is further a function of one or more of a quantity of punctured amplitude bits in the set of QAM symbols, a quantity of the first subset of shaped bits, or a quantity of the second subset of shaped bits.
A non-transitory computer-readable medium having program code recorded thereon for wireless communication at a wireless communication device, the program code executed by one or more processors and comprising: program code to perform an amplitude shaping encoding operation on a set of information bits of a code block, the amplitude shaping encoding operation generating a set of shaped information bits; program code to perform a systematic encoding operation on the set of shaped information bits and on a set of unshaped information bits of the code block, the systematic encoding operation generating a set of parity bits; program code to map the set of shaped information bits, the set of unshaped information bits, and the set of parity bits to a set of quadrature amplitude modulation (QAM) symbols, each respective QAM symbol being associated with a sign bit and a set of amplitude bits, the mapping comprising: mapping at least a first subset of shaped bits of the set of shaped bits to respective amplitude bits in a first subset of QAM symbols of the set of QAM symbols; mapping at least a first subset of unshaped bits of the set of unshaped bits to respective amplitude bits in a second subset of QAM symbols of the set of QAM symbols, a quantity of QAM symbols in the second subset of QAM symbols being a function of at least a quantity of QAM symbols in the set of QAM symbols, a channel coding rate for the code block, and a modulation order associated with the set of QAM symbols; and mapping at least a first subset of parity bits of the set of parity bits to respective sign bits in the first and the second subsets of QAM symbols and to respective amplitude bits in the second subset of QAM symbols of the set of QAM symbols; program code to transmit the set of QAM symbols in accordance with the mapping of the set of shaped information bits, the set of unshaped information bits, and the set of parity bits.
The non-transitory computer-readable medium of claim 15, wherein: no unshaped bits of the set of unshaped bits are mapped to amplitude bits associated with the first subset of QAM symbols; no shaped bits of the set of shaped bits are mapped to amplitude bits associated with the second subset of QAM symbols; and no parity bits of the set of parity bits are mapped to amplitude bits associated with the first subset of QAM symbols.
The non-transitory computer-readable medium of claim 16, wherein a quantity of QAM symbols in the second subset of QAM symbols is further a function of a quantity of punctured amplitude bits in the set of QAM symbols.
The non-transitory computer-readable medium of claim 15, wherein the program code further comprises program code to map a second subset of shaped bits of the set of shaped bits to respective amplitude bits in the second subset of QAM symbols of the set of QAM symbols, wherein no bits of the set of unshaped bits are mapped to the first subset of QAM symbols.
The non-transitory computer-readable medium of claim 18, wherein a quantity of QAM symbols in the second subset of QAM symbols is further a function of a quantity of punctured amplitude bits in the set of QAM symbols.
The non-transitory computer-readable medium of claim 15, wherein the program code further comprises: program code to map a second subset of shaped bits of the set of shaped bits to respective amplitude bits in the second subset of QAM symbols of the set of QAM symbols; program code to map a second subset of unshaped bits of the set of unshaped bits to respective amplitude bits in the first subset of QAM symbols of the set of QAM symbols; and program code to map a second subset of the set of parity bits to respective amplitude bits in the first subset of QAM symbols of the set of QAM symbols, wherein a first quantity of the first subset of unshaped bits is greater than a second quantity of the second subset of unshaped bits.

Description

SUPPORTING PROBABILISTIC AMPLITUDE SHAPING (PAS) WITH LOWER CHANNEL CODING RATE FIELD OF THE DISCLOSURE The present disclosure relates generally to wireless communications, and more specifically to supporting probabilistic amplitude shaping (PAS) with lower channel coding rate. BACKGROUND Wireless communications systems are widely deployed to provide various telecommunications services such as telephony, video, data, messaging, and broadcasts. Typical wireless communications systems may employ multiple-access technologies capable of supporting communications with multiple users by sharing available system resources (for example, bandwidth, transmit power, and/or the like) . Examples of such multiple-access technologies include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency-division multiple access (FDMA) systems, orthogonal frequency-division multiple access (OFDMA) systems, single-carrier frequency-division multiple access (SC-FDMA) systems, time division synchronous code division multiple access (TD-SCDMA) systems, and long term evolution (LTE) . LTE/LTE-Advanced is a set of enhancements to the universal mobile telecommunications system (UMTS) mobile standard promulgated by the Third Generation Partnership Project (3GPP) . Narrowband (NB) -Internet of things (IoT) and enhanced machine-type communications (eMTC) are a set of enhancements to LTE for machine type communications. A wireless communications network may include a number of base stations (BSs) that can support communications for a number of user equipment (UEs) . A user equipment (UE) may communicate with a base station (BS) via the downlink and uplink. The downlink (or forward link) refers to the communication link from the BS to the UE, and the uplink (or reverse link) refers to the communication link from the UE to the BS. As will be described in more detail, a BS may be referred to as a Node B, an evolved Node B (eNB) , a gNB, an access point (AP) , a radio head, a transmit and receive point (TRP) , a new radio (NR) BS, a 5G Node B, and/or the like. The above multiple access technologies have been adopted in various telecommunications standards to provide a common protocol that enables different user equipment to communicate on a municipal, national, regional, and even global level. New radio (NR) , which may also be referred to as 5G, is a set of enhancements to the LTE mobile standard promulgated by the Third Generation Partnership Project (3GPP) . NR is designed to better support mobile broadband Internet access by improving spectral efficiency, lowering costs, improving services, making use of new spectrum, and better integrating with other open standards using orthogonal frequency division multiplexing (OFDM) with a cyclic prefix (CP) (CP-OFDM) on the downlink (DL) , using CP-OFDM and/or SC-FDM (for example, also known as discrete Fourier transform spread OFDM (DFT-s-OFDM) ) on the uplink (UL) , as well as supporting beamforming, multiple-input multiple-output (MIMO) antenna technology, and carrier aggregation. In wireless communication systems, quadrature amplitude modulation (QAM) is a modulation technique that changes an amplitude of two carrier waves, which are 90 degrees out of phase with each other (in quadrature) . These carrier waves represent two signal components: the in-phase (I) and the quadrature-phase (Q) components. The combined I and Q components form a QAM constellation, which is a grid of discrete points in a two-dimensional plane where each point represents a specific amplitude and phase combination. A number of points in the QAM constellation corresponds to the modulation order. For example, 16-QAM has 16 points in the constellation, representing 16 unique symbols, while 256-QAM has 256 points. Each point in the constellation corresponds to a specific symbol or combination of bits, and the distance between points (representing amplitude and phase differences) determines how susceptible the system is to noise and errors. In some cases, probabilistic shaping may generate non-uniformly distributed QAM constellations. Probabilistic amplitude shaping (PAS) is an example of probabilistic shaping, where a distribution of amplitude in the QAM constellation is shaped while a sign remains uniform. In PAS, shaping is applied prior to coding, and a forward error correction (FEC) preserves the shaping on the information bits. SUMMARY In some aspects of the present disclosure, a method of wireless communication at a wireless device includes performing an amplitude shaping encoding operation on a set of information bits of a code block, where the amplitude shaping encoding operation generates a set of shaped information bits. The method further includes performing a systematic encoding operation on the set of shaped information bits and a set of unshaped information bits of the code block, generating a set of parity bits. The method also includes mapping the set of shaped inform