Method for estimating nonlinear self-interference channel in wireless communication system and device for same

• US 10,491,429 B2
• Filed: 11/12/2015
• Issued: 11/26/2019
• Est. Priority Date: 07/14/2015
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Lee, Sangrim, Kim, Dongkyu, Ko, Hyunsoo, Noh, Kwangseok, Lee, Hojae
• Primary Examiner(s): Yao, Kwang B
• Assistant Examiner(s): Ngo, Nguyen H
• Application Number:
  US15/743,621
• Publication Number:
  US 20180205579A1
• Time in Patent Office: 1,475 Days
• Field of Search: 370241, 370252, 370276, 370277, 370278, 370282, 370286, 370287, 370289, 370292
• CPC Class Codes: H04B 1/525 with means for reducing leakage of transmitter signal into the receiver
• CPC Class Codes: H04J 11/0036 at the receiver
• CPC Class Codes: H04J 11/0063 of multipath interference, e.g. Rake receivers
• CPC Class Codes: H04L 25/0202 Channel estimation
• CPC Class Codes: H04L 25/03 Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
• CPC Class Codes: H04L 25/03146 with a recursive structure H04L25/03127 takes precedence
• CPC Class Codes: H04L 5/0032 Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
• 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 estimating a nonlinear self-interference channel in a wireless channel system, according to the present invention, can further comprise the steps of: applying a first sequence to a first symbol; applying, to a second symbol, a sequence of which a phase is shifted from that of the first sequence by π/2; and transmitting the first symbol and the second symbol.

Claims

1. A method for estimating a nonlinear self-interference channel in a wireless communication system supporting a full duplex radio (FDR) scheme, the method comprising:

applying a first sequence to a first symbol, the first sequence being a cyclic-shifted sequence of a third sequence;

applying, to a second symbol, a second sequence which is a π

/2 phase-shifted sequence of the first sequence; and

transmitting the first symbol and the second symbol,

wherein, when a same root value is used for both the third sequence and the first sequence, an autocorrelation between the first sequence and the third sequence is set to zero ‘

0’ and

the third sequence is a Zadoff-Chu root sequence.

2. The method according to claim 1, further comprising:

estimating a self-interference signal due to transmission of the first symbol and the second symbol.

3. The method according to claim 1, wherein the first symbol includes a cyclic prefix (CP) in a head portion thereof, and the second symbol includes a cyclic prefix (CP) in a head portion thereof.

4. The method according to claim 1, wherein the first symbol and the second symbol are consecutive symbols in a time domain.

5. The method according to claim 1, wherein:

each of the first symbol and the second symbol is a reference signal (RS) symbol.

6. An apparatus for estimating a nonlinear self-interference channel in a wireless communication system supporting a full duplex radio (FDR) scheme, the apparatus comprising:

a transceiver coupled to a processor; and

the processor configured to;

apply a first sequence to a first symbol, the first sequence being a cyclic-shifted sequence of a third sequence,

apply, to a second symbol, a second sequence is a π

/2 phase-shifted sequence of the first sequence, and

transmit the first symbol and the second symbol,

wherein, when a same root value is used for both the third sequence and the first sequence, an autocorrelation between the first sequence and the third sequence is set to zero ‘

0’ and

the third sequence is a Zadoff-Chu root sequence.

7. The apparatus according to claim 6, wherein the processor is configured to estimate a self-interference signal due to transmission of the first symbol and the second symbol.

8. The apparatus according to claim 6, wherein the first symbol includes a cyclic prefix (CP) in a head portion thereof, and the second symbol includes a cyclic prefix (CP) in a head portion thereof.

9. The apparatus according to claim 6, wherein the first symbol and the second symbol are consecutive symbols in a time domain.

10. The apparatus according to claim 6, wherein:

each of the first symbol and the second symbol is a reference signal (RS) symbol.