# US 11,909,492 B2 · Signal generating method and signal generating device

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- Number: US 11,909,492 B2
- Document ID: US11909492B2
- Status: Granted
- Kind: B2
- Application number: 18/127,239
- Filed: 2023-03-28
- Published: 2023-09-28
- Granted: 2024-02-20
- Earliest claimed: 2011-04-19
- Assignees: Sun Patent Trust
- Applicants: Sun Patent Trust
- Inventors: Yutaka Murakami; Tomohiro Kimura; Mikihiro Ouchi
- Web page: https://patentgrep.com/patent/US11909492B2

## CPC

- H04B 7/0697: {using spatial multiplexing}
- H04B 7/0413: MIMO systems
- H04B 7/0426: Power distribution
- H04B 7/0456: Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
- H04B 7/046: {taking physical layer constraints into account}
- H04B 7/0465: {taking power constraints at power amplifier or emission constraints, e.g. constant modulus, into account}
- H04B 7/0617: {for beam forming}
- H04B 7/0682: {using phase diversity (e.g. phase sweeping)}
- H04B 7/0862: {receiver computing weights based on information from the transmitter}
- H04L 25/0391: {construction details of matrices}
- H04W 52/42: in systems with time, space, frequency or polarisation diversity
- H04J 11/0033: {by pre-cancellation of known interference, e.g. using a matched filter, dirty paper coder or Thomlinson-Harashima precoder (correlative coding in synchronous or start-stop systems H04L25/497)}
- Y02D 30/70: in wireless communication networks
- H04B: TRANSMISSION
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- 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)
- 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 method for transmitting a first modulated signal and a second modulated signal in the same frequency at the same time. Each signal has been modulated according to a different modulation sheme. The transmission method applies precoding on both signals using a fixed precoding matrix, applies different power change to each signal, and regularly changes the phase of at least one of the signals, thereby improving received data signal quality for a reception device.

## Claims

### Claim 1

A mobile terminal comprising:
a wireless communication circuit; and
a processor configured to control the wireless communication circuit to receive (i) first data from a first base station in a first frequency band and (ii) second data from a second base station in a second frequency band, the first data being different from the second data, the first frequency band being different from the second frequency band, wherein
in a first mode, the wireless communication circuit receives from the first base station a first signal carrying the first data on which phase change has been performed, and
in a second mode different from the first mode, the wireless communication circuit receives from the first base station a second signal carrying the first data on which phase change has not been performed.