# US 2019/0296950 A1 · Transmission device and transmission method

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- Number: US 2019/0296950 A1
- Document ID: US20190296950A1
- Status: Published application
- Kind: A1
- Application number: 16/436,091
- Filed: 2019-06-10
- Published: 2019-09-26
- Earliest claimed: 2016-12-12
- 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/US20190296950A1

## CPC

- H04L 5/0048: {Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091)}
- H04B 7/0456: Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
- H04B 7/0671: {using different delays between antennas}
- Y02D 30/70: in wireless communication networks
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H04B: TRANSMISSION
- Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE

## Abstract

A transmission device that improves data reception quality includes: a first pilot inserter that inserts a pilot signal into a 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 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. Δλ satisfies π/2 radians <Δλ<π radians or π radians <Δλ<3π/2 radians. When the communications scheme is an OFDM scheme, the phase changer and the phase changer apply a phase change, and when the communications scheme is a single-carrier scheme, do not apply a phase change.

## Claims

### Claim 1

A transmission device, comprising:
a weighting synthesizer that generates 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;
a first pilot inserter that inserts a pilot signal into the first precoded signal;
a first phase changer that applies a phase change of i×Δλ to the second precoded signal, depending on a communications scheme, where i is a symbol number and an integer that is greater than or equal to 0;
a second pilot inserter that inserts a pilot signal into the second precoded signal applied with the phase change; and
a second phase changer that applies a phase change to the second precoded signal applied with the phase change and inserted with the pilot signal, depending on the communications scheme,
wherein Δλ satisfies π/2 radians <Δλ<π radians or π radians <A<3π/2 radians,
when the communications scheme is an orthogonal frequency division multiplexing (OFDM) scheme, the first phase changer and the second phase changer apply a phase change, and
when the communications scheme is a single-carrier scheme, at least one of the first phase changer and the second phase changer does not apply a phase change.

### Claim 2

A transmission method, comprising:
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;
inserting a pilot signal into the first precoded signal;
applying, as a first phase change process, a phase change of i×Δλ to the second precoded signal, depending on a communications scheme, where i is a symbol number and an integer that is greater than or equal to 0;
inserting a pilot signal into the second precoded signal applied with the phase change; and
applying, as a second phase change process, a phase change to the second precoded signal applied with the phase change and inserted with the pilot signal, depending on the communications scheme,
wherein Δλ satisfies π/2 radians <A<π radians or π radians <Δλ<3π/2 radians,
when the communications scheme is an orthogonal frequency division multiplexing (OFDM) scheme, the first phase change process and the second phase change process are performed, and
when the communications scheme is a single-carrier scheme, at least one of the first phase change process and the second phase change process is not performed.