Method for FDR scheme-using communication device transmitting reference signals for estimating channel of non-linear self-interference signal

• US 10,333,581 B2
• Filed: 07/07/2016
• Issued: 06/25/2019
• Est. Priority Date: 07/31/2015
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Kim, Dongkyu, Ko, Hyunsoo, Noh, Kwangseok, Lee, Sangrim, Lee, Hojae
• Primary Examiner(s): Duong, Duc T
• Application Number:
  US15/555,933
• Publication Number:
  US 20180048347A1
• Time in Patent Office: 1,083 Days
• Field of Search: None
• CPC Class Codes: H04B 1/0475 with means for limiting noise, interference or distortion H04B1/0483 takes precedence
• CPC Class Codes: H04B 1/525 with means for reducing leakage of transmitter signal into the receiver
• CPC Class Codes: H04L 25/0202 Channel estimation
• CPC Class Codes: H04L 25/0226 sounding signals per se
• CPC Class Codes: H04L 27/261 Details of reference signals
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/0082 at predetermined intervals
• CPC Class Codes: H04L 5/14 Two-way operation using the same type of signal, i.e. duplex
• CPC Class Codes: H04L 5/1461 Suppression of signals in the return path, i.e. bidirectional control circuits

Abstract

A method for a FDR scheme-using communication device transmitting reference signals for estimating a channel of a non-linear self-interference signal comprises the step of transmitting, on a specific symbol of a corresponding subframe, reference signals for estimating the channel of the non-linear self-interference signal, wherein a sequence mapped to the reference signals is a sequence generated in a frequency domain by being discrete Fourier transform (DFT)-converted, and the generated sequence may be mapped, on the frequency domain, to a RE for the reference signals.

Claims

1. A method for transmitting a reference signal for channel estimation of a non-linear self-interference signal by a communication device using a full duplex radio (FDR) scheme, the method comprising:

transmitting reference signals for channel estimation of the non-linear self-interference signal on a specific symbol of a corresponding subframe,

wherein a sequence mapped to the reference signals is subjected to discrete Fourier transform (DFT) and generated in a frequency domain, and

wherein the generated sequence is mapped to a resource element (RE) for the reference signals in the frequency domain.

2. The method according to claim 1, wherein the specific symbol corresponds to a fourth symbol of the corresponding subframe in a time-axis direction.

3. The method according to claim 1, wherein the reference signals are transmitted on the specific symbol of the corresponding subframe in full bandwidth.

4. The method according to claim 1, wherein the reference signals are transmitted on the specific symbol of the corresponding subframe in a specific band.

5. The method according to claim 4, wherein, if the reference signals are transmitted on the specific symbol of the corresponding subframe in the specific band, a reference signal which zero is inserted is transmitted on the specific symbol of the corresponding subframe.

6. The method according to claim 1, wherein the corresponding subframe corresponds to a subframe index 0 or a subframe index 5.

7. A communication device for transmitting a reference signal for channel estimation of a non-linear self-interference signal in a full duplex radio (FDR) environment, the communication system comprising:

a transmitter; and

a processor,

wherein the processor controls the transmitter to transmit reference signals for channel estimation of the non-linear self-interference signal on a specific symbol of a corresponding subframe,

wherein a sequence mapped to the reference signals is subjected to discrete Fourier transform (DFT) and generated in a frequency domain, and

wherein the generated sequence is mapped to a resource element (RE) for the reference signals in the frequency domain.

8. The communication device according to claim 7, wherein the specific symbol corresponds to a fourth symbol of the corresponding subframe in a time-axis direction.

9. The communication device according to claim 7, wherein the processor controls the transmitter to transmit the reference signals on the specific symbol of the corresponding subframe in full bandwidth.

10. The communication device according to claim 7, wherein the processor controls the transmitter to transmit the reference signals on the specific symbol of the corresponding subframe in a specific band.

11. The communication device according to claim 10, wherein, if the reference signals are transmitted on the specific symbol of the corresponding subframe in the specific band, the processor controls the transmitter to transmit a reference signal which zero is inserted on the specific symbol of the corresponding subframe.

12. The communication device according to claim 7, wherein the corresponding subframe corresponds to a subframe index 0 or a subframe index 5.