Method and device for cancelling inter-symbol interference in wireless communication system

• US 10,454,745 B2
• Filed: 07/01/2016
• Issued: 10/22/2019
• Est. Priority Date: 07/03/2015
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Lee, Hyunyong, Kim, Jung Ju, Lee, Joon-Young
• Primary Examiner(s): Huq, Obaidul
• Application Number:
  US15/741,744
• Publication Number:
  US 20180219717A1
• Time in Patent Office: 1,208 Days
• Field of Search: 370310, 370328, 370329
• CPC Class Codes: H04B 7/0617 for beam forming
• CPC Class Codes: H04B 7/063 Parameters other than those covered in groups H04B7/0623 - H04B7/0634, e.g. channel matrix rank or transmit mode selection
• CPC Class Codes: H04B 7/0673 using feedback from receiving side
• CPC Class Codes: H04B 7/086 using weights depending on external parameters, e.g. direction of arrival [DOA], predetermined weights or beamforming
• CPC Class Codes: H04B 7/2678 Time synchronisation
• CPC Class Codes: H04L 2025/03426 transmission using multiple-input and multiple-output channels
• CPC Class Codes: H04L 27/26 Systems using multi-frequency codes H04L27/32 takes precedence
• CPC Class Codes: H04L 27/2691 involving interference determination or cancellation
• CPC Class Codes: H04W 56/0015 one node acting as a reference for the others
• CPC Class Codes: H04W 56/004 compensating for timing error of reception due to propagation delay
• CPC Class Codes: H04W 56/0065 using measurement of signal travel time

Abstract

The present disclosure relates to a pre-5^th-Generation (5G) or 5G communication system to be provided for supporting higher data rates Beyond 4^th-Generation (4G) communication system such as Long Term Evolution (LTE). The present invention provides a method and a device for cancelling inter-symbol interference in a wireless communication system. A method for a base station in a wireless communication system can comprises the steps of: transmitting multiple synchronous signals through multiple antennas to a terminal; receiving information on a propagation delay difference among the multiple synchronous signals from the terminal; and determining signal transmission timing for each of the multiple antennas on the basis of the information on the propagation delay difference.

Claims

1. An apparatus of a base station (BS) in a wireless communication system, the apparatus comprising:

at least one transceiver; and

at least one processor operably coupled to the at least one transceiver,

wherein the at least one processor is configured to;

transmit, to a terminal, a first synchronization signal using a first transmission antenna of the BS and a second synchronization signal using a second transmission antenna of the BS;

receive, from the terminal, information related to a propagation delay difference (PDD) between the first synchronization signal and the second synchronization signal; and

transmit, to the terminal, a first stream signal using the first transmission antenna and a second stream signal using the second transmission antenna by adjusting a transmission timing of at least one of the first stream signal or the second stream signal based on the information related to the PDD,

wherein the information related to the PDD is transmitted if a time interval corresponding to the PDD and a delay spread is longer than a length of cyclic prefix (CP).

2. The apparatus of claim 1, wherein the information related to the PDD includes identification information of the first transmission antenna and information indicating a PDD between the first transmission antenna and at least one other antenna, and

wherein the first transmission antenna is an antenna of the BS corresponding to a synchronization signal that arrives at a mobile station (MS) first or last among a plurality of transmission antennas of the BS.

3. The apparatus of claim 1, wherein the at least one processor is, in order to transmit the first stream signal and the second stream signal, configured to:

determine a first transmission time point for the first stream signal and a second transmission time point for the second stream signal by delaying the at least one of the first stream signal or the second stream signal by a time corresponding to the PDD; and

transmit the first stream signal at the first transmission time point and the second stream signal at the second transmission time point.

4. The apparatus of claim 3, wherein the first transmission time point and the second transmission time point are associated with one orthogonal frequency division multiplexing (OFDM) symbol for a mobile station (MS) to receive the first stream signal and the second stream signal.

5. The apparatus of claim 1, wherein the transmission timing is adjusted in a baseband such that a time difference between a first arrival time of the first stream signal at a mobile station (MS) and a second first arrival time of the second stream signal at the MS is within the length of the CP.

6. An apparatus of a terminal in a wireless communication system, the apparatus comprising:

at least one transceiver; and

at least one processor operably coupled to the at least one transceiver,

wherein the at least one processor is configured to;

receive, from a base station (BS), a first synchronization signal transmitted by using a first transmission antenna of the BS and a second synchronization signal transmitted by using a second transmission antenna of the BS;

transmit, to the BS, information related to a propagation delay difference (PDD) between the first synchronization signal and the second synchronization signal if a time interval corresponding to the PDD and a delay spread is longer than a length of cyclic prefix (CP); and

receive, from the BS, a first stream signal transmitted by using the first transmission antenna and a second stream signal transmitted by using using the second transmission antenna, and

wherein a transmission timing for at least one of the first stream signal or the second stream signal is adjusted based on the information related to the PDD.

7. The apparatus of claim 6, wherein the information related to the PDD includes identification information of the first transmission antenna and information indicating a PDD between the first transmission antenna and at least one other antenna, and

wherein the first transmission antenna is an antenna of the BS corresponding to a synchronization signal that arrives at a mobile station (MS) first or last among a plurality of transmission antennas of the BS.

8. The apparatus of claim 6, wherein the information related the PDD includes upper bits among a plurality of bits of a bit sequence indicating the PDD, and

wherein lowers bit except the upper bits from the plurality of bits to the delay spread corresponding to the CP.

9. The apparatus of claim 6, wherein the at least one processor is, in order to transmit the information related to the PDD, configured to:

identify that inter-symbol interference (ISI) occurs if the time interval corresponding to the PDD and the delay spread is longer than a length of the CP; and

in response to identifying that the inter-symbol interference occurs, transmit the information related the PDD to the BS.

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

when the PDD is larger than or equal to a maximum PDD, determine candidate beams by excluding a beam corresponding to the PDD among a plurality of beams of the BS; and

transmit, to the BS, information for indicating a beam identified to perform communication between the BS and the terminal among the determined candidate beams.

11. The apparatus of claim 6, wherein the transmission timing is adjusted in a baseband such that a time difference between a first arrival time of the first stream signal at a mobile station (MS) and a second first arrival time of the second stream signal at the MS is within a length of the CP.

12. The apparatus of claim 6, wherein the first stream signal and the second stream signal are received within one orthogonal frequency division multiplexing (OFDM) symbol for a mobile station (MS) including the CP.

13. A method for operating a terminal in a wireless communication system, the method comprising:

receiving, from a base station (BS), a first synchronization signal transmitted by using a first transmission antenna of the BS and a second synchronization signal transmitted by using a second transmission antenna of the BS;

transmitting, to the BS, information related to a propagation delay difference (PDD) between the first synchronization signal and the second synchronization signal if a time interval corresponding to the PDD and a delay spread is longer than a length of cyclic prefix (CP); and

receiving, from the BS, a first stream signal transmitted by using the first transmission antenna and a second stream signal transmitted by using using the second transmission antenna,

wherein a transmission timing for at least one of the first stream signal or the second stream signal is adjusted based on the information related to the PDD.

14. The method of claim 13, wherein the information related to the PDD includes identification information of the first transmission antenna and information indicating a PDD between the first transmission antenna and at least one other antenna, and

wherein the first transmission antenna is an antenna of the BS corresponding to a synchronization signal that arrives at a mobile station (MS) first or last among a plurality of transmission antennas of the BS.

15. The method of claim 13, wherein the information related the PDD includes upper bits among a plurality of bits of a bit sequence indicating the PDD, and

wherein lowers bit except the upper bits from the plurality of bits to the delay spread corresponding to the CP.

16. The method of claim 13, wherein transmitting the information related to the PDD comprises:

identifying that inter-symbol interference (ISI) occurs if the time interval corresponding to the PDD and the delay spread is longer than a length of the CP; and

in response to identifying that the inter-symbol interference occurs, transmitting the information related the PDD to the BS.

17. The method of claim 13, further comprising:

when the PDD is larger than or equal to a maximum PDD, determining candidate beams by excluding a beam corresponding to the PDD among a plurality of beams of the BS; and

transmitting, to the BS, information for indicating a beam identified to perform communication between the BS and the terminal among the determined candidate beams.

18. The method of claim 13, wherein the transmission timing is adjusted in a baseband such that a time difference between a first arrival time of the first stream signal at a mobile station (MS) and a second first arrival time of the second stream signal at the MS is within a length of the CP.

19. The method of claim 13, wherein the first stream signal and the second stream signal are received within one orthogonal frequency division multiplexing (OFDM) symbol for a mobile station (MS) including the CP.