# US 12,191,945 B2 · Transmission device and transmission method

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- Number: US 12,191,945 B2
- Document ID: US12191945B2
- Status: Granted
- Kind: B2
- Application number: 18/388,965
- Filed: 2023-11-13
- Published: 2024-04-18
- Granted: 2025-01-07
- Earliest claimed: 2016-06-30
- Assignees: Panasonic Intellectual Property Corporation of America
- Applicants: Panasonic Intellectual Property Corporation of America
- Inventors: Yutaka Murakami; Tomohiro Kimura; Mikihiro Ouchi; Hiroyuki Motozuka
- Web page: https://patentgrep.com/patent/US12191945B2

## CPC

- H04B 7/0456: Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
- H04B 7/0697: {using spatial multiplexing}
- H04B 7/0413: MIMO systems
- H04B 7/0417: Feedback systems
- H04B 7/0615: {of weighted versions of same signal}
- H04B: TRANSMISSION

## Abstract

A transmission device includes: a weighting synthesizer that generates a first precoded signal and a second precoded signal; a first pilot inserter that inserts a pilot signal into the first precoded signal; a phase changer that applies a phase change of i×Δλ to the second precoded signal, where i is a symbol number and an integer that is greater than or equal to 0; an inserter that inserts a pilot signal into the phase-changed second precoded signal; and a phase changer that applies a phase change to the phase-changed and pilot-signal-inserted second precoded signal. Δλ satisfies π/2 radians<Δλ<π radians or π radians<Δλ<3π/2 radians.

## Claims

### Claim 1

A transmitting device comprising:
a processor configured to:
generate a first precoded signal and a second precoded signal by performing a precoding process on a first baseband signal and a second baseband signal, respectively;
generate a first signal by inserting a pilot signal into the first precoded signal;
apply a phase change of i×Δλ to the second precoded signal, where i is a symbol number and an integer that is greater than or equal to 0, and Δλ=π−π/m radians, where m is an integer that is greater than 3;
insert a pilot signal into the second precoded signal applied with the phase change; and
generate a second signal by applying a phase change to the second precoded signal applied with the phase change and inserted with the pilot signal, and
a transmitter configured to transmit the first signal and the second signal.

### Claim 2

A receiving device comprising:
a receiver configured to receive a first signal and a second signal; and
a processor configured to generate a first baseband signal and a second baseband signal by performing a receiving process on the first signal and the second signal, the receiving process corresponding to a transmitting process, wherein
the transmitting process includes:
generating a first precoded signal and a second precoded signal by performing a precoding process on the first baseband signal and the second baseband signal, respectively;
generating the first signal by inserting a pilot signal into the first precoded signal;
applying a phase change of i×Δλ to the second precoded signal, where i is a symbol number and an integer that is greater than or equal to 0, and Δλ=π−π/m radians, where m is an integer that is greater than 3;
inserting a pilot signal into the second precoded signal applied with the phase change;
generating the second signal by applying a phase change to the second precoded signal applied with the phase change and inserted with the pilot signal; and
transmitting the first signal and the second signal.

### Claim 3

A non-transitory computer readable medium storing a program configured to cause a transmitting device to perform:
generating a first precoded signal and a second precoded signal by performing a precoding process on a first baseband signal and a second baseband signal, respectively;
generating a first signal by inserting a pilot signal into the first precoded signal;
applying a phase change of i×Δλ to the second precoded signal, where i is a symbol number and an integer that is greater than or equal to 0, and Δλ=π−π/m radians, where m is an integer that is greater than 3;
inserting a pilot signal into the second precoded signal applied with the phase change;
generating a second signal by applying a phase change to the second precoded signal applied with the phase change and inserted with the pilot signal; and
transmitting the first signal and the second signal.