# US 11,115,166 B2 · Radio transmission apparatus and methods for transmitting a single or a plurality of modulation signals from one or more antenna

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- Number: US 11,115,166 B2
- Document ID: US11115166B2
- Status: Granted
- Kind: B2
- Application number: 16/823,490
- Filed: 2020-03-19
- Published: 2020-07-09
- Granted: 2021-09-07
- Earliest claimed: 2001-11-13
- Assignees: Wi-Fi One, LLC
- Applicants: Wi-Fi One, LLC
- Inventors: Yutaka Murakami; Masayuki Orihashi; Akihiko Matsuoka
- Web page: https://patentgrep.com/patent/US11115166B2

## 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 7/06: at the transmitting station
- H04B 7/0626: {Channel coefficients, e.g. channel state information [CSI]}
- H04B 7/0689: {using different transmission schemes, at least one of them being a diversity transmission scheme}
- H04B 7/0697: {using spatial multiplexing}
- H04L 1/0618: {Space-time coding}
- H04L 5/0023: {Time-frequency-space}
- H04L 5/003: {Arrangements for allocating sub-channels of the transmission path}
- H04L 25/0204: {of multiple channels}
- H04L 27/04: Modulator circuits; Transmitter circuits
- H04L 27/06: Demodulator circuits; Receiver circuits
- H04L 27/12: Modulator circuits; Transmitter circuits
- H04L 27/14: Demodulator circuits; Receiver circuits
- H04L 27/18: Phase-modulated carrier systems, i.e. using phase-shift keying (H04L27/32 takes precedence)
- H04L 27/2602: {Signal structure}
- H04L 27/2627: {Modulators}
- H04L 27/2657: {Carrier synchronisation}
- H04L 27/2659: {Coarse or integer frequency offset determination and synchronisation}
- H04L 27/2691: {involving interference determination or cancellation}
- H04L 27/2695: {with channel estimation, e.g. determination of delay spread, derivative or peak tracking (channel estimation H04L25/0202)}
- H04L 69/22: Parsing or analysis of headers
- H04W 52/52: using AGC [Automatic Gain Control] circuits or amplifiers
- H04B 7/0413: MIMO systems
- H04B 7/0632: {Channel quality parameters, e.g. channel quality indicator [CQI]}
- H04B 7/0671: {using different delays between antennas}
- H04B 7/082: {selecting best antenna path}
- H04L 27/2601: {Multicarrier modulation systems}
- H04W 72/0453: Resources in frequency domain, e.g. a carrier in FDMA
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H04B: TRANSMISSION
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

A radio transmission apparatus determines information indicative of an estimated communications channel condition and generates a single modulation signal or a plurality of modulation signals based on the estimated communications channel condition information. The single modulation signal is transmitted from a first antenna of a plurality of antenna or the plurality of modulation signals are transmitted from the first antenna and at least a second antenna of the plurality of antenna. The plurality of modulation signals include different information from each other and are transmitted over an identical frequency band and at an identical temporal point. The single modulation signal and the plurality of modulation signals contain parameter information indicating a number of modulation signals transmitted at the same time.

## Claims

### Claim 1

A radio transmission apparatus comprising:
a plurality of antenna and circuitry configured to:
determine information indicative of an estimated communications channel condition;
generate, based on the information indicative of the estimated communications channel condition, a single modulation signal or a plurality of modulation signals; and
transmit, based on the generation of the single modulation signal or the plurality of modulation signals, the single modulation signal from a first antenna of the plurality of antenna or the plurality of modulation signals from the first antenna and at least a second antenna of the plurality of antenna,
wherein the plurality of modulation signals include different information from each other and are transmitted over an identical frequency band and at an identical temporal point, and
wherein the single modulation signal and the plurality of modulation signals contain parameter information indicating a number of modulation signals transmitted at the same time.

### Claim 2 (depends on 1)

The radio transmission apparatus of claim 1, wherein the information indicative of the estimated communications channel condition is estimated based on a modulation signal transmitted when a communication starts.

### Claim 3 (depends on 1)

The radio transmission apparatus of claim 1, wherein the determination of the information indicative of the estimated communications channel condition comprises receipt, from a communications partner device, of the information indicative of the estimated communications channel condition.

### Claim 4 (depends on 1)

The radio transmission apparatus of claim 1, wherein the circuitry is further configured to receive, from a communications partner device, parameter information indicative of the number of modulation signals transmitted at the same time.

### Claim 5

A transmission method comprising:
determining information indicative of an estimated communications channel condition;
generating, based on the information indicative of the estimated communications channel condition, a single modulation signal or a plurality of modulation signals; and
transmitting, based on the generation of the single modulation signal or the plurality of modulation signals, the single modulation signal from a first antenna of a plurality of antenna or the plurality of modulation signals from the first antenna and at least a second antenna of the plurality of antenna,
wherein the plurality of modulation signals include different information from each other and are transmitted over an identical frequency band and at an identical temporal point, and
wherein the single modulation signal and the plurality of modulation signals contain parameter information indicating a number of modulation signals transmitted at the same time.

### Claim 6 (depends on 5)

The transmission method of claim 5, wherein a modulation signal is transmitted when a communication starts and is used in estimating the estimated communications channel condition.

### Claim 7 (depends on 5)

The radio transmission method of claim 5, wherein determining the information indicative of the estimated communications channel condition comprises receiving, from a communications partner device, the information indicative of the estimated communications channel condition.

### Claim 8 (depends on 5)

The radio transmission method of claim 5, further comprising receiving, from a communications partner device, parameter information indicative of number of modulation signals transmitted at the same time.