# US 10,873,492 B2 · Transmission method, transmission device, reception method, and reception device

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 10,873,492 B2
- Document ID: US10873492B2
- Status: Granted
- Kind: B2
- Application number: 16/573,458
- Filed: 2019-09-17
- Published: 2020-01-09
- Granted: 2020-12-22
- Earliest claimed: 2016-07-14
- Assignees: Panasonic Intellectual Property Corporation of America
- Applicants: Panasonic Intellectual Property Corporation of America
- Inventors: Yutaka Murakami; Tomohiro Kimura; Mikihiro Ouchi
- Web page: https://patentgrep.com/patent/US10873492B2

## CPC

- H04L 27/2602: {Signal structure}
- H04L 27/3433: {using an underlying square constellation}
- H04B 7/0456: Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
- H04B 7/0615: {of weighted versions of same signal}
- H04B 7/0682: {using phase diversity (e.g. phase sweeping)}
- H04L 1/0003: {by switching between different modulation schemes}
- H04L 27/26: Systems using multi-frequency codes (H04L27/32 takes precedence)
- H04L 27/3472: {by switching between alternative constellations}
- H04L 27/36: Modulator circuits; Transmitter circuits
- H04L 5/0023: {Time-frequency-space}
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H04B: TRANSMISSION

## Abstract

Provided is a transmission method that improves data reception quality in radio transmission using a single-carrier scheme and/or a multi-carrier scheme. The transmission method includes: generating a plurality of first modulated signals and a plurality of second modulated signals from transmission data, the plurality of first modulated signals being signals generated using a 16 QAM modulation scheme, and the plurality of second modulated signals being signals generated using uniform constellation 64 QAM modulation; generating, from the plurality of first modulated signals and the plurality of second modulated signals, a plurality of first signal-processed signals and a plurality of second signal-processed signals which satisfy a predetermined equation; and changing the predetermined equation when a 64 QAM modulation used to generate the plurality of second modulated signals is switched from the uniform constellation 64 QAM modulation to a non-uniform constellation 64 QAM modulation.

## Claims

### Claim 1

A transmission method, comprising:
modulating quadrature phase shift keying (QPSK) points s1(i) by using bits of a first stream and 16 quadrature amplitude modulation (QAM) points s2(i) by using bits of a second stream, where i is an integer greater than or equal to 0;
converting the QPSK points s1(i) and the 16-QAM points s2(i) to first converted points z1(i) and second converted points z2(i), the first converted points z1(i) and the second converted points z2(i) satisfying Equation (1), wherein the Equation (1) is defined as:
(
z
⁢
⁢
1
⁢
(
i
)
z
⁢
⁢
2
⁢
(
i
)
)
=
(
1
0
0
y
⁡
(
i
)
)
⁢
1
2
⁢
(
1
1
1
-
1
)
⁢
(
2
/
3
0
0
4
/
3
)
⁢
(
s
⁢
⁢
1
⁢
(
i
)
s
⁢
⁢
2
⁢
(
i
)
)
,
where y(i) is a function represented by ejδ(i), where δ(i) is a real value incremented by a constant value for every i, a value of y(i) periodically varies with a period of N, where N is 8; and
transmitting the first converted points z1(i) and the second converted points z2(i) using a plurality of antennas.

### Claim 2 (depends on 1)

The transmission method of claim 1, wherein the constant value is 2π/N.

### Claim 3

A transmission device, comprising:
a mapper that, in operation, modulates quadrature phase shift keying (QPSK) points s1(i) by using bits of a first stream and 16 quadrature amplitude modulation (QAM) points s2(i) by using bits of a second stream, where i is an integer greater than or equal to 0;
a signal processor that, in operation, converts the QPSK points s1(i) and the 16-QAM points s2(i) to first converted points z1(i) and second converted points z2(i), the first converted points z1(i) and the second converted points z2(i) satisfying Equation (1), wherein the Equation (1) is defined as:
(
z
⁢
⁢
1
⁢
(
i
)
z
⁢
⁢
2
⁢
(
i
)
)
=
(
1
0
0
y
⁡
(
i
)
)
⁢
1
2
⁢
(
1
1
1
-
1
)
⁢
(
2
/
3
0
0
4
/
3
)
⁢
(
s
⁢
⁢
1
⁢
(
i
)
s
⁢
⁢
2
⁢
(
i
)
)
,
where y(i) is a function represented by ejδ(i), where δ(i) is a real value incremented by a constant value for every i, a value of y(i) periodically varies with a period of N, where N is 8; and
a transmitter that, in operation, transmits the first converted points z1(i) and the second converted points z2(i) using a plurality of antennas.

### Claim 4 (depends on 3)

The transmission device of claim 3, wherein the constant value is 2π/N.

### Claim 5

A reception method, comprising:
obtaining reception signals by receiving first converted signals z1(i) and second converted signals z2(i) transmitted by using plurality of antennas, where i is an integer greater than or equal to 0,
wherein the first converted signals z1(i) and the second converted signals z2(i) are generated by converting quadrature phase shift keying (QPSK) points s1(i) and 16 quadrature amplitude modulation (QAM) points s2(i), the QPSK points s1(i) are modulated by using bits of a first stream and the 16-QAM points s2(i) are modulated by using bits of a second stream, the first converted points z1(i) and the second converted points z2(i) satisfy Equation (1), wherein the Equation (1) is defined as:
(
z
⁢
⁢
1
⁢
(
i
)
z
⁢
⁢
2
⁢
(
i
)
)
=
(
1
0
0
y
⁡
(
i
)
)
⁢
1
2
⁢
(
1
1
1
-
1
)
⁢
(
2
/
3
0
0
4
/
3
)
⁢
(
s
⁢
⁢
1
⁢
(
i
)
s
⁢
⁢
2
⁢
(
i
)
)
,
where y(i) is a function represented by ejδ(i), where δ(i) is a real value incremented by a constant value for every i, a value of y(i) periodically varies with a period of N, where N is 8; and
demodulating the reception signals according to the conversion applied to the QPSK points s1(i) and the 16-QAM points s2(i).

### Claim 6 (depends on 5)

The reception method of claim 5, wherein the constant value is 2π/N.

### Claim 7

A reception device, comprising:
a receiver that, in operation, obtains reception signals by receiving first converted signals z1(i) and second converted signals z2(i) transmitted by using plurality of antennas, where i is an integer greater than or equal to 0,
wherein the first converted signals z1(i) and the second converted signals z2(i) are generated by converting quadrature phase shift keying (QPSK) points s1(i) and 16 quadrature amplitude modulation (QAM) points s2(i), the QPSK points s1(i) are modulated by using bits of a first stream and the 16-QAM points s2(i) are modulated by using bits of a second stream, the first converted points z1(i) and the second converted points z2(i) satisfy Equation (1), wherein the Equation (1) is defined as:
(
z
⁢
⁢
1
⁢
(
i
)
z
⁢
⁢
2
⁢
(
i
)
)
=
(
1
0
0
y
⁡
(
i
)
)
⁢
1
2
⁢
(
1
1
1
-
1
)
⁢
(
2
/
3
0
0
4
/
3
)
⁢
(
s
⁢
⁢
1
⁢
(
i
)
s
⁢
⁢
2
⁢
(
i
)
)
,
where y(i) is a function represented by ejδ(i), where δ(i) is a real value incremented by a constant value for every i, a value of y(i) periodically varies with a period of N, where N is 8; and
a demodulator that, in operation, demodulates the reception signals according to the conversion applied to the QPSK points s1(i) and the 16-QAM points s2(i).

### Claim 8 (depends on 7)

The reception device of claim 7, wherein the constant value is 2π/N.