# US 12,119,900 B2 · Transmission device and transmission method

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- Number: US 12,119,900 B2
- Document ID: US12119900B2
- Status: Granted
- Kind: B2
- Application number: 18/110,543
- Filed: 2023-02-16
- Published: 2023-06-22
- Granted: 2024-10-15
- Earliest claimed: 2017-07-12
- Assignees: Panasonic Intellectual Property Corporation of America
- Applicants: Panasonic Intellectual Property Corporation of America
- Inventors: Yutaka Murakami; Hiroyuki Motozuka
- Web page: https://patentgrep.com/patent/US12119900B2

## CPC

- H04B 7/0456: Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
- H04B 7/0682: {using phase diversity (e.g. phase sweeping)}
- H04B 1/0475: {with means for limiting noise, interference or distortion (H04B1/0483 takes precedence)}
- H04B 7/0413: MIMO systems
- H04L 27/206: {using a pair of orthogonal carriers, e.g. quadrature carriers}
- H04B: TRANSMISSION
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

A transmission device includes: a weighting synthesizer that generates a first precoded signal and a second precoded signal from a first baseband signal and a second baseband signal, respectively; a phase changer that applies a phase change of i×Δλ to the second precoded signal; an inserter that inserts a pilot signal into the second precoded signal applied with the phase change; and a phase changer that applies a phase change to the second precoded signal applied with the phase change and inserted with the pilot signal. The weighting synthesizer performs, in the precoding process, a calculation that uses F = ( e j ⁢ θ 11 e j ( θ 11 + π 4 ) e j ⁢ θ 21 e j ( θ 21 + π + π 4 ) ) on the first baseband signal and the second baseband signal modulated via a modulation scheme of QPSK.

## Claims

### Claim 1

A transmission apparatus, comprising:
memory; and
circuitry which, in operation, performs:
selecting one transmission scheme from among transmission scheme candidates, the transmission scheme candidates including a first transmission scheme and a second transmission scheme,
(i) when the first transmission scheme is selected,
modulating a first bit sequence to generate a single symbol sequence;
performing a first precoding on N first symbols included in the single symbol sequence to generate N first precoded symbols, where N is an integer equal to or greater than two; and
transmitting the N first precoded symbols at same time, the N first precoded symbols being mapped on N subcarriers, and
(ii) when the second transmission scheme is selected,
modulating a second bit sequence to generate M symbol sequences, where M is an integer equal to or greater than two;
performing a second precoding on M second symbols to generate 2M second precoded symbols, the M second symbols including one symbol included in each of the M symbol sequences; and
transmitting the 2M second precoded symbols through 2M antennas at same time, the 2M second precoded symbols being mapped on same subcarrier.

### Claim 2 (depends on 1)

The transmission apparatus according to claim 1, wherein the 2M second precoded symbols include a first group of M second precoded symbols and a second group of M second precoded symbols, the M second precoded symbols of the second group being equal to the M second precoded symbols of the first group to which phase changes of same phase change amount are applied, respectively.

### Claim 3 (depends on 2)

The transmission apparatus according to claim 2, wherein the first precoding and the second precoding are performed according to a same precoding matrix.

### Claim 4 (depends on 1)

The transmission apparatus according to claim 1, wherein each of coefficients of the first precoding apply phase change to the first symbol multiplied.

### Claim 5

A transmission method, comprising:
selecting one transmission scheme from among transmission scheme candidates, the transmission scheme candidates including a first transmission scheme and a second transmission scheme,
(i) when the first transmission scheme is selected,
modulating a first bit sequence to generate a single symbol sequence;
performing a first precoding on N first symbols included in the single symbol sequence to generate N first precoded symbols, where N is an integer equal to or greater than two; and
transmitting the N first precoded symbols at same time, the N first precoded symbols being mapped on N subcarriers, and
(ii) when the second transmission scheme is selected,
modulating a second bit sequence to generate M symbol sequences, where M is an integer equal to or greater than two;
performing a second precoding on M second symbols to generate 2M second precoded symbols, the M second symbols including one symbol included in each of the M symbol sequences; and
transmitting the 2M second precoded symbols through 2M antennas at same time, the 2M second precoded symbols being mapped on same subcarrier.

### Claim 6 (depends on 5)

The transmission method according to claim 5, wherein the 2M second precoded symbols include a first group of M second precoded symbols and a second group of M second precoded symbols, the M second precoded symbols of the second group being equal to the M second precoded symbols of the first group to which phase changes of same phase change amount are applied, respectively.

### Claim 7 (depends on 6)

The transmission method according to claim 6, wherein the first precoding and the second precoding are performed according to a same precoding matrix.

### Claim 8 (depends on 5)

The transmission method according to claim 5, wherein each of coefficients of the first precoding apply phase change to the first symbol multiplied.