# US 2018/0324019 A1 · Method of transmitting reference signal and transmitter using the same

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- Number: US 2018/0324019 A1
- Document ID: US20180324019A1
- Status: Published application
- Kind: A1
- Application number: 16/023,910
- Filed: 2018-06-29
- Published: 2018-11-08
- Earliest claimed: 2008-03-17
- Assignees: LG Electronics Inc.
- Applicants: LG Electronics Inc.
- Inventors: Jung Hoon LEE; Dae Won LEE; Ki Jun KIM; Joon Kui AHN
- Web page: https://patentgrep.com/patent/US20180324019A1

## CPC

- H04L 27/2613: {Structure of the reference signals}
- H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT}
- H04L 5/0048: {Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091)}
- H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals}
- H04L 25/0226: {sounding signals per se}
- H04L 27/262: {Reduction thereof by selection of pilot symbols}
- Y02D 30/70: in wireless communication networks
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE

## Abstract

A method and device for generating a reference signal sequence are discussed. The method includes generating the reference signal sequence, and transmitting the reference signal sequence, wherein the reference signal sequence is defined by a specific equation based on a pseudo-random sequence.

## Claims

### Claim 1

A method comprising:
generating a reference signal sequence; and
transmitting the reference signal sequence,
wherein the reference signal sequence is defined by
r

(
m
)
=
1
2

(
1
-
2
·
c

(
2


m
)
)
+
j

1
2

(
1
-
2
·
c

(
2


m
+
1
)
)
where m=0, . . . , M, M is an integer larger than zero, and c(2m) and c(2m+1) are defined by a pseudo-random sequence c(i), and
wherein the pseudo-random sequence c(i) is defined by a gold sequence generator which is initialized with an initial value obtained by using (2 NIDcell+1), where NIDcell is a cell identifier.

### Claim 2 (depends on 1)

The method of claim 1, wherein the pseudo-random sequence c(i) is defined by
c(i)=(x(i+Nc)+y(i+Nc))mod2
x(i+31)=(x(i+3)+x(i))mod2
y(i+31)=(y(i+3)+y(i+2)+y(i+1)+y(i))mod2
where x(i) and y(i) are m-sequences and Nc is a constant.

### Claim 3 (depends on 1)

The method of claim 1, wherein the initial value is obtained by using (2 NIDcell+1) and an orthogonal frequency division multiplexing (OFDM) symbol number.

### Claim 4 (depends on 1)

The method of claim 1, further comprising:
mapping the reference signal sequence to at least one resource block (RB) before transmitting the reference signal sequence.

### Claim 5 (depends on 4)

The method of claim 4, wherein a value of M relates to the number of the at least one RB.

### Claim 6

A device comprising:
a reference signal generator configured to generate a reference signal sequence; and
a transmit circuitry configured to transmit the reference signal sequence,
wherein the reference signal sequence is defined by
r

(
m
)
=
1
2

(
1
-
2
·
c

(
2


m
)
)
+
j

1
2

(
1
-
2
·
c

(
2


m
+
1
)
)
where m=0, . . . , M, M is an integer larger than zero, and c(2m) and c(2m+1) are defined by a pseudo-random sequence c(i), and
wherein the pseudo-random sequence c(i) is defined by a gold sequence generator which is initialized with an initial value obtained by using (2 NIDcell+1), where NIDcell is a cell identifier.

### Claim 7 (depends on 6)

The device of claim 6, wherein the pseudo-random sequence c(i) is defined by
c(i)=(x(i+Nc)+y(i+Nc))mod2
x(i+31)=(x(i+3)+x(i))mod2
y(i+31)=(y(i+3)+y(i+2)+y(i+1)+y(i))mod2
where x(i) and y(i) are m-sequences and Nc is a constant.

### Claim 8 (depends on 6)

The device of claim 6, wherein the initial value is obtained by using (2NIDcell+1) and an orthogonal frequency division multiplexing (OFDM) symbol number.

### Claim 9 (depends on 6)

The device of claim 6, wherein the transmit circuitry is configured to map the reference signal sequence to at least one resource block (RB) before transmitting the reference signal sequence.

### Claim 10 (depends on 9)

The device of claim 9, wherein a value of M relates to the number of the at least one RB.