IP Library › Granted Patent US 12676699
Granted Patent B2
US 12676699 · App. 18/279,593 · Granted Jul 7, 2026

Methods and apparatus to facilitate distribution matching via reversed compression

Inventors: Ori Shental (Marlboro, NJ); Thomas Joseph Richardson (South Orange, NJ); Liangming Wu (Beijing, CN); Kexin Xiao (Shanghai, CN); Ashwin Sampath (Skillman, NJ); Muhammad Nazmul Islam (Littleton, MA); Michael Dimare (Morristown, NJ); Michael Ethan Berkowitz (New York, NY); Changlong Xu (Beijing, CN); Hao Xu (Beijing, CN)
Assignee: QUALCOMM Incorporated
H04L1/0042H04W28/04
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Quick Facts
Patent No.
US 12676699
App. No.
18/279,593
Granted
Jul 7, 2026
Kind
B2
Abstract

Apparatus, methods, and computer-readable media for facilitating distribution matching via reversed compression are disclosed herein. An example method for wireless communication at a wireless transmitter includes decompressing a first sequence of information bits for wireless transmission to output a sequence of shaped symbols. The example method also includes compressing the sequence of shaped symbols to output a second sequence of compressed information bits. The example method also includes transmitting, to a receiver, a signal comprising the sequence of shaped symbols.

Claims (53)

1 . An apparatus for wireless communication at a wireless transmitter, comprising:

memory; and

at least one processor coupled to the memory, the at least one processor configured to:

decompress a first sequence of information bits for wireless transmission to output a sequence of shaped symbols;

compress the sequence of shaped symbols to output a second sequence of compressed information bits; and

transmit, to a receiver, a signal comprising the sequence of shaped symbols.

2 . The apparatus of claim 1 , wherein the decompression is based on a target symbol length and a target probability mass function (PMF) and the compression is based on the target PMF.

3 . The apparatus of claim 2 , wherein the first sequence of information bits comprises a fixed sequence of information bits, and wherein the at least one processor is further configured to:

signal, to the receiver, information about postfix bits to discard at the receiver based on a comparison of the first sequence of information bits and the second sequence of compressed information bits.

4 . The apparatus of claim 2 , wherein the first sequence of information bits comprises a variable number of information bits.

5 . The apparatus of claim 4 , wherein the first sequence of information bits is a prefix subset of a fixed sequence of information bits.

6 . The apparatus of claim 5 , wherein the at least one processor is further configured to:

stop the decompression of the fixed sequence of information bits; and

restart decompression of remaining information bits based on a variable determined from the second sequence of compressed information bits.

7 . The apparatus of claim 5 , wherein the sequence of shaped symbols transmitted to the receiver is based on the fixed sequence of information bits scaled by an integer number.

8 . The apparatus of claim 7 , wherein the integer number is based on a target entropy for the target PMF.

9 . The apparatus of claim 2 , wherein the decompression is based on arithmetic decoding and the compression is based on arithmetic coding.

10 . The apparatus of claim 2 , wherein the decompression is based one or more of Huffman coding, range coding, or universal coding.

11 . The apparatus of claim 2 , wherein the decompression is based on probabilistic decompression and the compression is based on probabilistic compression.

12 . The apparatus of claim 2 , wherein the decompression of the first sequence of information bits is performed at a distribution matcher.

13 . The apparatus of claim 2 , wherein the sequence of shaped symbols comprises shaped positive amplitude symbols.

14 . The apparatus of claim 2 , wherein the at least one processor is further configured to:

perform forward error correction (FEC) encoding to the sequence of shaped symbols output based on the decompression of the first sequence of information bits.

15 . A method of wireless communication at a wireless transmitter, comprising:

decompressing a first sequence of information bits for wireless transmission to output a sequence of shaped symbols;

compressing the sequence of shaped symbols to output a second sequence of compressed information bits; and

transmitting, to a receiver, a signal comprising the sequence of shaped symbols.

16 . The method of claim 15 , wherein the decompressing is based on a target symbol length and a target probability mass function (PMF), the compressing is based on the target PMF, the first sequence of information bits comprises a fixed sequence of information bits, and the method further comprises:

signaling, to the receiver, information about postfix bits to discard at the receiver based on a comparison of the first sequence of information bits and the second sequence of compressed information bits.

17 . The method of claim 15 , wherein the decompressing is based on a target symbol length and a target probability mass function (PMF), the compressing is based on the target PMF, the first sequence of information bits comprises a variable number of information bits, the first sequence of information bits is a prefix subset of a fixed sequence of information bits, and the method further comprises:

stopping the decompression of the fixed sequence of information bits; and

restarting decompression of remaining information bits based on a variable determined from the second sequence of compressed information bits.

18 . An apparatus for wireless communication at a wireless receiver, comprising:

memory; and

at least one processor coupled to the memory, the at least one processor configured to:

receive, from a transmitter, a signal comprising a sequence of shaped symbols generated based on a target probability mass function (PMF); and

compress the sequence of shaped symbols to output a sequence of compressed information bits, wherein the compression is based on the sequence of shaped symbols and the target PMF.

19 . The apparatus of claim 18 , wherein the sequence of shaped symbols is based on a fixed sequence of information bits, and wherein the at least one processor is further configured to:

receive, from the transmitter, information about postfix bits to discard.

20 . The apparatus of claim 18 , wherein the sequence of shaped symbols comprises a variable number of information bits.

21 . The apparatus of claim 20 , wherein the variable number of information bits is a prefix subset of a fixed sequence of information bits.

22 . The apparatus of claim 21 , wherein the sequence of shaped symbols received at the wireless receiver is based on the fixed sequence of information bits scaled by an integer number.

23 . The apparatus of claim 22 , wherein the integer number is based on a target entropy for the target PMF.

24 . The apparatus of claim 18 , wherein the compression is based on arithmetic coding.

25 . The apparatus of claim 18 , wherein the compression is based one or more of Huffman coding, range coding, or universal coding.

26 . The apparatus of claim 18 , wherein the compression is based on probabilistic compression.

27 . The apparatus of claim 18 , wherein the compression of the sequence of shaped symbols is performed at a distribution dematcher.

28 . The apparatus of claim 18 , wherein the sequence of shaped symbols comprises shaped positive amplitude symbols.

29 . The apparatus of claim 18 , wherein the at least one processor is further configured to:

perform forward error correction (FEC) decoding of the sequence of shaped symbols output prior to the compression.

30 . A method of wireless communication at a wireless receiver, comprising:

receiving, from a transmitter, a signal comprising a sequence of shaped symbols generated based on a target probability mass function (PMF); and

compressing the sequence of shaped symbols to output a sequence of compressed information bits, wherein the compressing is based on the sequence of shaped symbols and the target PMF.