METHOD AND APPARATUS FOR ESTIMATING COMMUNICATION CHANNEL IN MOBILE COMMUNICATION SYSTEM

• US 20150215010A1
• Filed: 01/29/2015
• Published: 07/30/2015
• Est. Priority Date: 01/29/2014
• Status: Active Grant

• Current Assignee: Korea University Research and Business Foundation, Samsung Electronics Co. Ltd.
• Original Assignee: Korea University Research and Business Foundation, Samsung Electronics Co. Ltd.
• Inventors: Shim, Byonghyo, Park, Sunho, Kim, Taeyoung, Seol, Jiyun
• Granted Patent: US 9,722,679 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04B 7/0413 MIMO systems
• CPC Class Codes: H04B 7/0851 using training sequences or error signal minimizing error signal H04B7/0854
• CPC Class Codes: H04L 1/005 Iterative decoding, including iteration between signal detection and decoding operation
• CPC Class Codes: H04L 1/0054 Maximum-likelihood or sequential decoding, e.g. Viterbi, Fano, ZJ algorithms
• CPC Class Codes: H04L 1/20 using signal quality detector
• CPC Class Codes: H04L 25/0202 Channel estimation
• CPC Class Codes: H04L 25/022 of frequency response
• CPC Class Codes: H04L 25/023 with extension to other symbols
• CPC Class Codes: H04L 25/0232 by interpolation between sounding signals
• CPC Class Codes: H04L 25/0236 using estimation of the other symbols

Abstract

A method of receiving a signal by a receiver in a mobile communication system is provided. The method includes: receiving a reference signal from a transmitter; determining first channel information based on the received reference signal; receiving a data signal based on the first channel information; and determining second channel information based on the received data signal and the first channel information. Iterative channel estimation is performed to reduce channel estimation errors by determining errors of signals received from a turbo decoding unit and using symbol information as pilots even in subcarriers where the pilot signals are not transmitted, and to increase the accuracy of LLR calculation through an iteration process such as a detection and decoding process in comparison with the conventional technology, thereby increasing the reception performance of the turbo decoding unit and improving communication efficiency.

Claims

1. A method of receiving a signal by a receiver in a mobile communication system, the method comprising:

receiving a reference signal from a transmitter;

determining first channel information based on the received reference signal;

receiving a data signal based on the first channel information; and

determining second channel information based on the received data signal and the first channel information.

2. The method of claim 1, wherein the first channel information includes a first likelihood ratio determined based on the received reference signal, and the second channel information includes a second likelihood ration calculated based on the received data signal.

3. The method of claim 1, wherein receiving of the data signal based on the first channel information comprises decoding the received data signal based on the first channel information, the method further comprising, determining, if the decoded signal has an error, a resource area having the error.

4. The method of claim 3, wherein determining of the resource area having the error comprises determining whether the decoded signal has the error based on at least one of the first channel information and the second channel information.

5. The method of claim 3, further comprising omitting a channel estimation in the resource area having the error.

6. The method of claim 5, further comprising estimating a channel of the resource area having the error based on channel information estimated in a resource area adjacent to the resource area having the error on time and frequency domains.

7. The method of claim 1, further comprising decoding the data signal based on the second channel information.

8. The method of claim 1, wherein determining of the first channel information comprises:

vectorizing the received reference signal;

determining a correlation between channels receiving the reference signal based on the vectorized reference signal; and

determining the first channel information based on the correlation.

9. The method of claim 2, further comprising:

converting the received data signal to a soft symbol based on the first likelihood ratio and the second likelihood ratio; and

determining third channel information based on the soft symbol.

10. The method of claim 1, further comprising:

determining fourth channel information based on the second channel information and the received data signal;

decoding received data based on the fourth channel information; and

if the decoded data does not meet a preset reference, determining fifth channel information based on the fourth channel information and the received data signal.

11. An apparatus of a mobile communication system, the apparatus comprising:

at least one processor configured to receive a reference signal from the transmitter, to determine first channel information based on the received reference signal, to receive a data signal based on the first channel information, and to determine second channel information based on the received data signal and the first channel information.

12. The apparatus of claim 11, wherein the first channel information includes a first likelihood ratio determined based on the received reference signal, and the second channel information includes a second likelihood ration calculated based on the received data signal.

13. The apparatus of claim 11, wherein the at least one processor is configured to decode the received data signal based on the first channel information, and, if the decoded signal has an error, determine a resource area having the error.

14. The apparatus of claim 13, wherein the at least one processor is configured to determine whether the decoded signal has the error based on at least one of the first channel information and the second channel information.

15. The apparatus of claim 13, wherein the at least one processor is configured to omit a channel estimation in the resource area having the error.

16. The apparatus of claim 15, wherein the at least one processor is configured to estimate a channel of the resource area having the error based on channel information estimated in a resource area adjacent to the resource area having the error on time and frequency domains.

17. The apparatus of claim 11, wherein the at least one processor is configured to decode the data signal based on the second channel information.

18. The apparatus of claim 11, wherein the at least one processor is configured to vectorize the received reference signal, determine a correlation between channels receiving the reference signal based on the vectorized reference signal, and determine the first channel information based on the correlation.

19. The apparatus of claim 12, wherein the at least one processor is configured to convert the received data signal into a soft symbol based on the first likelihood ratio and the second likelihood ratio, and determine third channel information based on the soft symbol.

20. The apparatus of claim 11, wherein the at least one processor is configured to determine fourth channel information based on the second channel information and the received data signal, decode received data based on the fourth channel information, and, if the decoded data does not meet a preset reference, determine fifth channel information based on the fourth channel information and the received data signal.