# US 12,184,565 B2 · Transmission method, reception method, transmitter, and receiver

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- Number: US 12,184,565 B2
- Document ID: US12184565B2
- Status: Granted
- Kind: B2
- Application number: 18/141,556
- Filed: 2023-05-01
- Published: 2023-08-31
- Granted: 2024-12-31
- Earliest claimed: 2012-05-22
- Assignees: Sun Patent Trust
- Applicants: Sun Patent Trust
- Inventors: Yutaka Murakami; Tomohiro Kimura; Mikihiro Ouchi
- Web page: https://patentgrep.com/patent/US12184565B2

## CPC

- H04L 5/0032: {Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation}
- H04B 7/022: Site diversity; Macro-diversity (using two or more spaced independent antennas H04B7/04)
- H04B 7/024: Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
- H04B 7/0413: MIMO systems
- 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 7/0619: {using feedback from receiving side (feedback signaling for adaptive modulation/coding H04L1/0001)}
- H04B 7/0848: {Joint weighting}
- H04B 7/086: {using weights depending on external parameters, e.g. direction of arrival [DOA], predetermined weights or beamforming}
- H04B 7/0891: {Space-time diversity (rake receivers H04B1/7115; space-time decoding H04L1/0631)}
- H04B 7/10: Polarisation diversity; Directional diversity
- H04J 11/00: Orthogonal multiplex systems, {e.g. using WALSH codes}(H04J13/00 takes precedence)
- H04L 5/005: {of common pilots, i.e. pilots destined for multiple users or terminals}
- H04L 12/1868: {Measures taken after transmission, e.g. acknowledgments}
- H04B 7/0469: {taking special antenna structures, e.g. cross polarized antennas into account}
- H04W 72/30: Resource management for broadcast services
- H04W 72/54: based on quality criteria
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H04B: TRANSMISSION
- H04J: MULTIPLEX COMMUNICATION (transmission in general H04B; peculiar to transmission of digital information H04L5/00; systems for the simultaneous or sequential transmission of more than one television signal H04N7/08; in exchanges H04Q11/00; stereophonic systems H04S)
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

When transmitting signals from a plurality of base stations (broadcasting stations), the base stations include at least a first base station having a first antenna with a first polarization and a second base station having a second antenna with a second polarization that is different from the first polarization. Then, when the first base station transmits a signal from the first antenna having the first polarization, the second base station transmits the same signal as the first antenna of the first base station from a second antenna having the second polarization, at the same time.

## Claims

### Claim 1

A transmission method executed by a transmission system, the transmission method comprising:
generating a first data symbol and a second data symbol from transmission data;
performing a pre-coding on the first data symbol and the second data symbol to generate a first pre-coded symbol and a second pre-coded symbol;
performing a first phase changing on the first pre-coded symbol to generate a first transmission signal;
performing a second phase changing on the second pre-coded symbol to generate a second transmission signal;
performing a third phase changing on the first pre-coded symbol to generate a third transmission signal;
performing a fourth phase changing on the second pre-coded symbol to generate a fourth transmission signal, and
transmitting the first transmission signal, the second transmission signal, the third transmission signal, and the fourth transmission signal from a first antenna, a second antenna, third antenna, and a fourth antenna, respectively.

### Claim 2

A transmission system comprising:
circuitry;
a first antenna;
a second antenna;
a third antenna; and
a fourth antenna,
wherein, in operation, the circuitry:
generates a first data symbol and a second data symbol from transmission data;
performs a pre-coding on the first data symbol and the second data symbol to generate a first pre-coded symbol and a second pre-coded symbol;
performs a first phase changing on the first pre-coded symbol to generate a first transmission signal;
performs a second phase changing on the second pre-coded symbol to generate a second transmission signal;
performs a third phase changing on the first pre-coded symbol to generate a third transmission signal;
performs a fourth phase changing on the second pre-coded symbol to generate a fourth transmission signal; and
transmits the first transmission signal, the second transmission signal, the third transmission signal, and the fourth transmission signal from a first antenna, a second antenna, third antenna, and a fourth antenna, respectively.