Apparatus and method for processing signal in wireless communication system

Patent metadata

Field	Value
Publication number	US-10461890-B2
Application number	US-201815891265-A
Country	US
Kind code	B2
Filing date	Feb 7, 2018
Priority date	Feb 8, 2017
Publication date	Oct 29, 2019
Grant date	Oct 29, 2019

Abstract

The present disclosure relates to a pre-5th-Generation (5G) or 5G communication system for supporting higher data rates Beyond 4th-Generation (4G) communication systems such as Long Term Evolution (LTE). A method for operating a receiver in a wireless communication system may include: receiving a signal from a transmitter; performing Integer Forcing (IF) equalization on the received signal; determining a log LikeLihood Ratio (LLR) value of each bit by using a posteriori probability of each bit for the signal determined based on an equalization matrix and a likelihood value for the signal; and decoding the signal by using the LLR value.

First claim

What is claimed is:

1. A method for operating a device in a wireless communication system, the method comprising:
applying an integer forcing (IF) equalization to a received signal to obtain an equalized signal;
determining a log likelihood ratio (LLR) value of a bit in a symbol of the equalized signal based on a posteriori probability (APP) of other bits in the symbol of the equalized signal and a likelihood function for the equalized signal;
obtaining the symbol of the equalized signal based on LLR values of a plurality of bits in the symbol of the equalized signal including the LLR value of the bit; and
obtaining a symbol of the received signal from the symbol of the equalized signal.

2. The method of claim 1 , wherein the determining of the LLR value of the bit comprises determining, based on an APP of a first bit in the symbol of the equalized signal, an APP of a first bit in the symbol of the received signal.

3. The method of claim 2 , wherein the determining of the LLR value of the bit comprises determining, based on the APP of the first bit in the symbol of the received signal, an APP of other bits in the symbol of the received signal.

4. The method of claim 3 , wherein the determining of the LLR value of the bit comprises determining, based on the APP of the other bits in the symbol of the received signal, the APP of the other bits in the symbol of the equalized signal.

5. The method of claim 1 wherein the determining of the LLR value of the bit comprises determining, based on the APP of the other bits in the symbol of the equalized signal, an APP of the bit in the symbol of the equalized signal.

6. The method of claim 5 , wherein the determining of the LLR value of the bit comprises determining, based on the APP of the bit in the symbol of the equalized signal, the LLR value of the bit.

7. The method of claim 1 , further comprising:
obtaining a codeword for the plurality of bits,
wherein symbols of the received signal comprising the symbol of the received signal are generated based on the plurality of bits, and
wherein the codeword for the plurality of bits corresponds to an input to another device transmitting a signal corresponding to the received signal.

8. The method of claim 7 , wherein the plurality of bits are applied with a natural labeling, in which bit values are mapped with constellation points such that values represented by the bits increase by 1 in an order of constellation points in a same domain.

9. The method of claim 1 , wherein the symbol of the received signal is identified by applying an inverse of an integer matrix associated with an equalization matrix for the IF equalization to the symbol of the equalized signal.

10. A device in a wireless communication system, the device comprising:
a transceiver; and
at least one processor operatively coupled with the transceiver,
wherein the at least one processor is configured to control to:
apply an integer forcing (IF) equalization to a received signal to obtain an equalized signal,
determine a log likelihood ratio (LLR) value of a bit in a symbol of the equalized signal based on a posteriori probability (APP) of other bits in the symbol of the equalized signal and a likelihood function for the equalized signal,
obtain the symbol of the equalized signal based on LLR values of a plurality of bits in the symbol of the equalized signal including the LLR value of the bit, and
obtain a symbol of the received signal from the symbol of the equalized signal.

11. The device of claim 10 , wherein the at least one processor is configured to control to determine, based on an APP of a first bit in the symbol of the equalized signal, an APP of a first bit in the symbol of the received signal.

12. The device of claim 11 , wherein the at least one processor is configured to control to determine, based on the APP of the first bit in the symbol of the received signal, an APP of other bits in the symbol of the received signal.

13. The device of claim 12 , wherein the at least one processor is configured to control to determine, based on the APP of the other bits in the symbol of the received signal, the APP of the other bits in the symbol of the equalized signal.

14. The device of claim 10 , wherein the at least one processor is configured to control to determine, based on the APP of the other bits in the symbol of the equalized signal, an APP of the bit in the symbol of the equalized signal.

15. The device of claim 14 , wherein the at least one processor is configured to control to determine, based on the APP of the bit in the symbol of the equalized signal, the LLR value of the bit.

16. The device of claim 10 , wherein the at least one processor is further configured to obtain a codeword for the plurality of bits,
wherein symbols of the received signal comprising the symbol of the received signal are generated based on the plurality of bits, and
wherein the codeword for the plurality of bits corresponds to an input to another device transmitting a signal corresponding to the received signal.

17. The device of claim 16 , wherein the plurality of bits are applied with a natural labeling, in which bit values are mapped with constellation points such that values represented by the bits increase by 1 in an order of constellation points in a same domain.

18. The device of claim 10 , wherein the symbol of the received signal is identified by applying an inverse of an integer matrix associated with an equalization matrix for the IF equalization to the symbol of the equalized signal.

Assignees

• Samsung Electronics Co Ltd
• Postech Acad Ind Found

Inventors

• Ahn Seok-Ki
• Yang Kyeongcheol
• Yang Daeyeol
• Cho Sunghye

Classifications

• H04L27/38

  Demodulator circuits; Receiver circuits · CPC title

• H04L2025/0342

  QAM · CPC title

• H04L1/0045

  Arrangements at the receiver end · CPC title

• H04L27/01

  Equalisers {(baseband equalizers at the transmitter end H04L25/03343; in analogue transmission systems H04B3/04, H04B7/005)} · CPC title

• H04L25/067

  providing soft decisions, i.e. decisions together with an estimate of reliability (H04L25/068 and H04L25/069 take precedence; sequence estimation techniques H04L25/03178) · CPC title