# US 12,010,054 B2 · DMRS transmission

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- Number: US 12,010,054 B2
- Document ID: US12010054B2
- Status: Granted
- Kind: B2
- Application number: 17/419,988
- Filed: 2019-01-09
- Published: 2022-03-17
- Granted: 2024-06-11
- Earliest claimed: 2019-01-09
- Assignees: NEC Corporation
- Applicants: NEC Corporation
- Inventors: Yukai Gao; Lin Liang; Gang Wang
- Web page: https://patentgrep.com/patent/US12010054B2

## CPC

- 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 27/262: {Reduction thereof by selection of pilot symbols}
- H04L 5/0051: {of dedicated pilots, i.e. pilots destined for a single user or terminal}
- H04L 25/0226: {sounding signals per se}
- H04L 27/206: {using a pair of orthogonal carriers, e.g. quadrature carriers}
- H04L 27/2613: {Structure of the reference signals}
- H04L 27/2614: {Peak power aspects}
- H04L 27/3488: {Multiresolution systems}
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

Embodiments of the present disclosure relate to methods, devices and computer readable media for DMRS transmission. A method implemented at a terminal device comprises selecting, from a plurality of computer generated (CG) sequences, a CG sequence for an uplink channel modulated with a predetermined modulation technique. The method further comprises generating, based on the selected CG sequence, a DMRS sequence for the uplink channel. In addition, the method further comprises transmitting, over the uplink channel, the DMRS sequence to a network device. The embodiments of the present disclosure can provide a set of candidate CG sequences with low PAPR, good autocorrelation performance and good cross-correlation performance for generating DMRS sequences for π/2-BPSK modulated PUSCH or PUCCH.

## Claims

### Claim 1

A method implemented at a terminal device, the method comprising:
generating, based on a first sequence, a Demodulation Reference Signal (DMRS) sequence for an uplink channel, wherein the first sequence is obtained as complex-valued modulation symbols resulting from a π/2-Binary Phase Shift Keying (BPSK) modulation applied to a binary sequence given by a table comprising a plurality of sequences; and
transmitting, over the uplink channel, the DMRS sequence to a base station, wherein,
in a case where a length of the first sequence is 12, the plurality of sequences include the following:
{0, 1, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0} and
{0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0},
in a case where a length of the first sequence is 18, the plurality of first sequences include the following:
{1, 1, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 1, 1, 0} and
{1, 1, 0, 1, 0, 1, 0, 1, 1, 0, 0, 0, 0, 1, 0, 0, 1, 0}, and
in a case where a length of the first sequence is 24, the plurality of first sequences include the following:
{1, 0, 0, 0, 1, 1, 0, 1, 0, 1, 0, 0, 1, 0, 0, 1, 1, 1, 1, 1, 1, 0, 0, 0},
{1, 0, 1, 0, 1, 1, 0, 0, 0, 1, 0, 0, 0, 1, 1, 1, 1, 1, 1, 0, 0, 1, 0, 0}, and
{0, 1, 0, 0, 1, 0, 1, 0, 1, 1, 0, 0, 0, 1, 1, 1, 1, 1, 1, 0, 0, 1, 0, 0}.

### Claim 2 (depends on 1)

The method of claim 1, wherein, in the case where the length of the first sequence is 12, the plurality of first sequences further include at least one of the following:
{0, 1, 1, 1, 0, 0, 0, 0, 0, 1, 0, 0}, and
{0, 1, 1, 1, 1, 1, 0, 0, 1, 0, 0, 0}.

### Claim 3 (depends on 1)

The method of claim 1, wherein in the case where the length of the first sequence is 18, the plurality of first sequences further include {0, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 0, 1, 0, 0, 1, 0, 0}.

### Claim 4 (depends on 1)

The method of claim 1, wherein each binary number of the binary sequence is expressed as b(i), and each of the complex-valued modulation symbols is defined as:
d
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e
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imod
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2
⁡
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i
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b
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(
i
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+
j
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1
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b
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.

### Claim 5

A method implemented at a base station, the method comprising:
generating, based on a first sequence, a Demodulation Reference Signal (DMRS) sequence for an uplink channel, wherein the first sequence is obtained as complex-valued modulation symbols resulting from a π/2-Binary Phase Shift Keying (BPSK) modulation applied to a binary sequence given by a table comprising a plurality of sequences; and
receiving, over the uplink channel, the DMRS sequence from a terminal device, wherein,
in a case where a length of the first sequence is 12, the plurality of sequences include the following:
{0, 1, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0} and
{0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0},
in a case where a length of the first sequence is 18, the plurality of sequences include the following:
{1, 1, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 1, 1, 0} and
{1, 1, 0, 1, 0, 1, 0, 1, 1, 0, 0, 0, 0, 1, 0, 0, 1, 0}, and
in a case where a length of the first sequence is 24, the plurality of first sequences include the following:
{1, 0, 0, 0, 1, 1, 0, 1, 0, 1, 0, 0, 1, 0, 0, 1, 1, 1, 1, 1, 1, 0, 0, 0},
{1, 0, 1, 0, 1, 1, 0, 0, 0, 1, 0, 0, 0, 1, 1, 1, 1, 1, 1, 0, 0, 1, 0, 0}, and
{0, 1, 0, 0, 1, 0, 1, 0, 1, 1, 0, 0, 0, 1, 1, 1, 1, 1, 1, 0, 0, 1, 0, 0}.

### Claim 6 (depends on 5)

The method of claim 5, wherein, in the case where the length of the first sequence is 12, the plurality of first sequences further include at least one of the following:
{0, 1, 1, 1, 0, 0, 0, 0, 0, 1, 0, 0}, and
{0, 1, 1, 1, 1, 1, 0, 0, 1, 0, 0, 0}.

### Claim 7 (depends on 5)

The method of claim 5, wherein, in the case where the length of the first sequence is 18, the plurality of first sequences further include {0, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 0, 1, 0, 0, 1, 0, 0}.

### Claim 8 (depends on 5)

The method of claim 5, wherein each binary number of the binary sequence is expressed as b(i), and each of the complex-valued modulation symbols is defined as:
d
⁡
(
i
)
=
e
j
⁢
π
2
⁢
(
imod
⁢
2
)
2
⁡
[
(
i
-
2
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b
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(
i
)
)
+
j
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(
1
-
2
⁢
b
⁡
(
i
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)
]
.

### Claim 9

A terminal device comprising:
a controller configured to generate, based on a first sequence, a Demodulation Reference Signal (DMRS) sequence for an uplink channel, wherein the first sequence is obtained as complex-valued modulation symbols resulting from a π/2-Binary Phase Shift Keying (BPSK) modulation applied to a binary sequence given by a table comprising a plurality of sequences; and
a transmitter configured to transmit, over the uplink channel, the DMRS sequence to a base station, wherein,
in a case where a length of the first sequence is 12, the plurality of first sequences include the following:
{0, 1, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0} and
{0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0},
in a case where a length of the first sequence is 18, the plurality of first sequences include the following:
{1, 1, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 1, 1, 0} and
{1, 1, 0, 1, 0, 1, 0, 1, 1, 0, 0, 0, 0, 1, 0, 0, 1, 0}, and
in a case where a length of the first sequence is 24, the plurality of first sequences include the following:
{1, 0, 0, 0, 1, 1, 0, 1, 0, 1, 0, 0, 1, 0, 0, 1, 1, 1, 1, 1, 1, 0, 0, 0},
{1, 0, 1, 0, 1, 1, 0, 0, 0, 1, 0, 0, 0, 1, 1, 1, 1, 1, 1, 0, 0, 1, 0, 0}, and
{0, 1, 0, 0, 1, 0, 1, 0, 1, 1, 0, 0, 0, 1, 1, 1, 1, 1, 1, 0, 0, 1, 0, 0}.

### Claim 10 (depends on 9)

The method of claim 9, wherein,
in the case where the length of the first sequence is 12, the plurality of first sequences further include at least one of the following:
{0, 1, 1, 1, 0, 0, 0, 0, 0, 1, 0, 0}, and
{0, 1, 1, 1, 1, 1, 0, 0, 1, 0, 0, 0}.

### Claim 11 (depends on 9)

The method of claim 9, wherein,
in the case where the length of the first sequence is 18, the plurality of first sequences further include {0, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 0, 1, 0, 0, 1, 0, 0}.

### Claim 12 (depends on 9)

The method of claim 9, wherein each binary number of the binary sequence is expressed as b(i), and each of the complex-valued modulation symbols is defined as:
d
⁡
(
i
)
=
e
j
⁢
π
2
⁢
(
imod
⁢
2
)
2
⁡
[
(
i
-
2
⁢
b
⁡
(
i
)
)
+
j
⁡
(
1
-
2
⁢
b
⁡
(
i
)
)
]
.