# US 11,444,818 B2 · Signal transmission method and apparatus

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- Number: US 11,444,818 B2
- Document ID: US11444818B2
- Status: Granted
- Kind: B2
- Application number: 17/080,311
- Filed: 2020-10-26
- Published: 2021-04-08
- Granted: 2022-09-13
- Earliest claimed: 2016-07-19
- Assignees: Huawei Technologies Co., Ltd.
- Applicants: Huawei Technologies Co., Ltd.
- Inventors: Tao Wu; Min Yan
- Web page: https://patentgrep.com/patent/US11444818B2

## CPC

- H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT}
- H04B 7/0456: Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
- H04L 5/0092: {Indication of how the channel is divided}
- H04L 27/183: {Multiresolution systems}
- H04L 27/2607: {Cyclic extensions}
- H04L 27/2627: {Modulators}
- H04L 27/3488: {Multiresolution systems}
- H04L 27/362: {Modulation using more than one carrier, e.g. with quadrature carriers, separately amplitude modulated (H04L27/366 takes precedence)}
- H04L 5/001: {the frequencies being arranged in component carriers}
- H04L 5/0046: {Determination of the number of bits transmitted on different sub-channels}
- H04L 27/2626: {Arrangements specific to the transmitter only}
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H04B: TRANSMISSION

## Abstract

A signal transmission method includes: combining a plurality of low-order modulated signals into N modulated signals; and transmitting the N modulated signals on N subcarriers, where the N subcarriers are subcarriers on frequency domain resources of M channels, an nth modulated signal in the N modulated signals is transmitted on an nth subcarrier in the N subcarriers, N is an integer greater than or equal to 2, M is an integer greater than or equal to 2, and n=1, 2, . . . , N. The signal transmission method can improve efficiency of a diversity gain.

## Claims

### Claim 1

A signal transmission method, comprising:
transmitting, by a signal transmission apparatus, four modulated signals on four subcarriers, wherein the four subcarriers are subcarriers on frequency domain resources of two channels, wherein the two channels include a first channel and a second channel, wherein the four subcarriers include a first subcarrier, a second subcarrier, a third subcarrier, and a fourth subcarrier, wherein the four modulated signals include a first modulated signal x1, a second modulated signal x2, a third modulated signal x3, and a fourth modulated signal x4, and wherein transmitting the four modulated signals on four subcarriers comprises:
transmitting the first modulated signal x1 on the first subcarrier, wherein the first subcarrier is a subcarrier of the first channel;
transmitting the second modulated signal x2 on the second subcarrier, wherein the second subcarrier is a subcarrier of the second channel;
transmitting the third modulated signal x3 on the third subcarrier, wherein the third subcarrier is a subcarrier of the first channel; and
transmitting the fourth modulated signal x4 on the fourth subcarrier, wherein the
fourth subcarrier is a subcarrier of the second channel;
wherein the four modulated signals x1, x2, x3, x4 are based on a channel matrix Q wherein the channel matrix Q is
Q
=
1
2
[
1
j
0
0
0
0
1
j
0
0
1
-
j
1
-
j
0
0
]
,
where j corresponds to an imaginary unit;
wherein two-channel aggregation is used for BPSK, and wherein the four modulated signals x1, x2, x3, x4 are expressed as follows:
[
x
1
x
2
x
3
x
4
]
=
1
2
⁡
[
1
j
0
0
0
0
1
j
0
0
1
-
j
1
-
j
0
0
]
︸
Q
⁡
[
s
1
s
2
s
3
s
4
]
,
where s1, s2, s3 and s4 are BPSK modulated signals, and x1, x2, x3 and x4 are QPSK modulated signals.

### Claim 2 (depends on 1)

The method according to claim 1, wherein the modulated signals transmitted on different channels include conjugates.

### Claim 3 (depends on 2)

The method according to claim 2, wherein the fourth modulated signal x4 is a conjugate of the first modulated signal x1.

### Claim 4 (depends on 2)

The method according to claim 2, wherein the third modulated signal x3 is a conjugate of the second modulated signal x2.

### Claim 5 (depends on 2)

The method according to claim 2, wherein the fourth modulated signal x4 is a conjugate of the first modulated signal x1 and the third modulated signal x3 is a conjugate of the second modulated signal x2.

### Claim 6

A signal transmission apparatus, comprising:
a transmitter; and
a processor;
wherein the processor is configured to cause the transmitter to transmit four modulated signals on four subcarriers, wherein the four subcarriers are subcarriers on frequency domain resources of two channels, wherein the two channels include a first channel and a second channel, the four subcarriers include a first subcarrier, a second subcarrier, a third subcarrier, and a fourth subcarrier, wherein the four modulated signals include a first modulated signal x1, a second modulated signal x2, a third modulated signal x3, and a fourth modulated signal x4, and wherein transmitting the four modulated signals on four subcarriers comprises:
transmitting the first modulated signal x1 on the first subcarrier, wherein the first subcarrier is a subcarrier of the first channel;
transmitting the second modulated signal x2 on the second subcarrier, wherein the second subcarrier is a subcarrier of the second channel;
transmitting the third modulated signal x3 on the third subcarrier, wherein the third subcarrier is a subcarrier of the first channel; and
transmitting the fourth modulated signal x4 on the fourth subcarrier, wherein the fourth subcarrier is a subcarrier of the second channel;
wherein the four modulated signals x1, x2, x3, x4 are based on a channel matrix Q, wherein the channel matrix Q is
Q
=
1
2
⁡
[
1
j
0
0
0
0
1
j
0
0
1
-
j
1
-
j
0
0
]
,
where j corresponds to an imaginary unit;
wherein two-channel aggregation is used for BPSK, and wherein the four modulated signals x1, x2, x3, x4 are expressed as follows:
[
x
1
x
2
x
3
x
4
]
=
1
2
⁡
[
1
j
0
0
0
0
1
j
0
0
1
-
j
1
-
j
0
0
]
︸
Q
⁡
[
s
1
s
2
s
3
s
4
]
,
where s1, s2, s3 and s4 are BPSK modulated signals, and x1, x2, x3 and x4 are QPSK modulated signals.

### Claim 7 (depends on 6)

The apparatus according to claim 6, wherein the modulated signals transmitted on different channels include conjugates.

### Claim 8 (depends on 7)

The apparatus according to claim 7, wherein the fourth modulated signal x4 is a conjugate of the first modulated signal x1.

### Claim 9 (depends on 7)

The apparatus according to claim 7, wherein the third modulated signal x3 is a conjugate of the second modulated signal x2.

### Claim 10 (depends on 7)

The apparatus according to claim 7, wherein the fourth modulated signal x4 is a conjugate of the first modulated signal x1 and the third modulated signal x3 is a conjugate of the second modulated signal x2.

### Claim 11

A non-transitory computer-readable medium having processor-executable instructions stored thereon for signal transmission, wherein the processor-executable instructions, when executed, facilitate:
transmitting four modulated signals on four subcarriers, wherein the four subcarriers are subcarriers on frequency domain resources of two channels, wherein the two channels include a first channel and a second channel, wherein the four subcarriers include a first subcarrier, a second subcarrier, a third subcarrier, and a fourth subcarrier, wherein the four modulated signals include a first modulated signal x1, a second modulated signal x2, a third modulated signal x3, and a fourth modulated signal x4, and wherein transmitting the four modulated signals on four subcarriers comprises:
transmitting the first modulated signal x1 on the first subcarrier, wherein the first subcarrier is a subcarrier of the first channel;
transmitting the second modulated signal x2 on the second subcarrier, wherein the second subcarrier is a subcarrier of the second channel;
transmitting the third modulated signal x3 on the third subcarrier, wherein the third subcarrier is a subcarrier of the first channel; and
transmitting the fourth modulated signal x4 on the fourth subcarrier, wherein the fourth subcarrier is a subcarrier of the second channel;
wherein the four modulated signals x1, x2, x3, x4 are based on a channel matrix Q, wherein the channel matrix Q is
Q
=
1
2
⁡
[
1
j
0
0
0
0
1
j
0
0
1
-
j
1
-
j
0
0
]
,
where j corresponds to an imaginary unit;
wherein two-channel aggregation is used for BPSK, and wherein the four modulated signals x1, x2, x3, x4 are expressed as follows:
[
x
1
x
2
x
3
x
4
]
=
1
2
⁡
[
1
j
0
0
0
0
1
j
0
0
1
-
j
1
-
j
0
0
]
︸
Q
⁡
[
s
1
s
2
s
3
s
4
]
,
where s1, s2, s3 and s4 are BPSK modulated signals, and x1, x2, x3 and x4 are QPSK modulated signals.

### Claim 12 (depends on 11)

The non-transitory computer-readable medium according to claim 11, wherein the modulated signals transmitted on different channels include conjugates.

### Claim 13 (depends on 12)

The non-transitory computer-readable medium according to claim 12, wherein the fourth modulated signal x4 is a conjugate of the first modulated signal x1.

### Claim 14 (depends on 12)

The non-transitory computer-readable medium according to claim 12, wherein the third modulated signal x3 is a conjugate of the second modulated signal x2.