# US 2018/0026825 A1 · Method and apparatus for spatial modulation based on virtual antenna

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- Number: US 2018/0026825 A1
- Document ID: US20180026825A1
- Status: Published application
- Kind: A1
- Application number: 15/549,135
- Filed: 2015-02-04
- Published: 2018-01-25
- Earliest claimed: 2015-02-04
- Assignees: LG Electronics Inc.
- Applicants: LG Electronics Inc.
- Inventors: Hyunsoo KO; Heejeong CHO; Hyeyoung CHOI; Ilmu BYUN; Kungmin PARK
- Web page: https://patentgrep.com/patent/US20180026825A1

## CPC

- H04L 27/362: {Modulation using more than one carrier, e.g. with quadrature carriers, separately amplitude modulated (H04L27/366 takes precedence)}
- H04B 7/0602: {using antenna switching (H04B7/0686 takes precedence; antenna beam directivity switching H01Q3/24)}
- H04B 7/0604: {with predefined switching scheme}
- H04B 7/0669: {using different channel coding between antennas (space-time coding H04L1/0618)}
- H04L 27/34: Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04B 7/0413: MIMO systems
- H04B 7/0613: {using simultaneous transmission (H04B7/0686 takes precedence)}
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H04B: TRANSMISSION

## Abstract

Disclosed is a method of transmitting signals by a transmitting side device having multiple antennas. In this method, the transmitting side device spatially modulates information to be transmitted, where the information is spatially modulated to be represented based on which antennas among the N antennas are selected to be used for transmission. And, the transmitting side device transmits the spatially modulated information through the selected antennas. Here, the number of the selected antennas for transmitting one transmission information unit (hereinafter, ‘M’ where M≦N) is plural. And, different sequence of the selected antennas represents different information to be transmitted.

## Claims

### Claim 1

A method of transmitting signals by a transmitting side device having multiple antennas (hereinafter ‘N antennas’), the method comprising:
spatially modulating information to be transmitted, wherein the information is spatially modulated to be represented based on which antennas among the N antennas are selected to be used for transmission; and
transmitting the spatially modulated information through the selected antennas,
wherein a number of the selected antennas for transmitting one transmission information unit (hereinafter, ‘M’ where M≦N) is plural, and
wherein different sequence of the selected antennas represents different information to be transmitted.

### Claim 2 (depends on 1)

The method of claim 1, wherein the one transmission information unit is generated based on linear combination of a plurality of information units, and
wherein a number of the plurality of information units corresponds to M.

### Claim 3 (depends on 2)

The method of claim 2, wherein the each of the information units corresponds to a QAM (Quadrature Amplitude Modulation) symbol.

### Claim 4 (depends on 1)

The method of claim 1, wherein the number of the selected antennas (M) is equal to the number of multiple antennas (N).

### Claim 5 (depends on 1)

The method of claim 1, wherein ‘01’ and ‘10’ are used for representing different information to be transmitted,
wherein ‘M’ is 2, wherein ‘01’ represents a first case where the one transmission information unit is transmitted through a first antenna first of the 2 antennas and then a second antenna of the 2 antennas, and
wherein ‘10’ represents a second case where the one transmission information unit is transmitted through the second antenna first and then the first antenna.

### Claim 6 (depends on 5)

The method of claim 5, wherein ‘00’ and ‘11’ are not used for representing the information to be transmitted.

### Claim 7 (depends on 5)

The method of claim 5, wherein the one transmission information unit is generated by:
(S1−S2)/√2, or
(S1+S2)/√2, and
wherein ‘S1’ and ‘S2’ represent each of information units.

### Claim 8 (depends on 1)

The method of claim 1, further comprising:
exchanging information on which sequence of the selected antennas represents which information to be transmitted with a receiving side device.

### Claim 9

A method of receiving signals transmitted via multiple transmission antennas (hereinafter ‘N antennas’) by a receiving side device, the method comprising:
estimating channels between one or more reception antennas and the multiple transmission antennas;
receiving spatially modulated information based on the estimated channel information; and
demodulating the spatially modulated information, wherein the spatially modulated information is represented based on which transmission antennas among the N antennas were used for transmission; and
wherein a number of the used transmission antennas used for transmitting one transmission information unit (hereinafter, ‘M’ where M≦N) is plural, and
wherein different sequence of the transmission antennas used for transmission represents different information.

### Claim 10 (depends on 9)

The method of claim 9, wherein the one transmission information unit is generated based on linear combination of a plurality of information units, and
wherein a number of the plurality of information units corresponds to M.

### Claim 11 (depends on 10)

The method of claim 10, wherein the each of the information units corresponds to a QAM (Quadrature Amplitude Modulation) symbol.

### Claim 12 (depends on 9)

The method of claim 9, wherein the number of the transmission antennas (M) used for transmission is equal to the number of multiple transmission antennas (N).

### Claim 13 (depends on 9)

The method of claim 9, wherein ‘01’ and ‘10’ are used for representing different information,
wherein ‘M’ is 2, wherein ‘01’ represents a first case where the one transmission information unit is transmitted through a first transmission antenna first of the 2 transmission antennas and then a second antenna of the 2 antennas, and
wherein ‘10’ represents a second case where the one transmission information unit is transmitted through the second transmission antenna first and then the first transmission antenna.

### Claim 14 (depends on 13)

The method of claim 13, wherein ‘00’ and ‘11’ are not used for representing the information.

### Claim 15 (depends on 13)

The method of claim 13, wherein the one transmission information unit is generated by:
(S1−S2)/√2, or
(S1+S2)/√2, and
wherein ‘S1’ and ‘S2’ represent each of information units.