# US 2018/0323947 A1 · Radio frequency communication systems with dynamic waveform control and power boost

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- Number: US 2018/0323947 A1
- Document ID: US20180323947A1
- Status: Published application
- Kind: A1
- Application number: 15/972,487
- Filed: 2018-05-07
- Published: 2018-11-08
- Earliest claimed: 2017-05-08
- Assignees: Skyworks Solutions, Inc.
- Applicants: Skyworks Solutions, Inc.
- Inventors: Dominique Michel Yves Brunel; David Richard Pehlke
- Web page: https://patentgrep.com/patent/US20180323947A1

## CPC

- H04L 27/2602: {Signal structure}
- H04L 5/14: Two-way operation using the same type of signal, i.e. duplex
- H04L 5/1469: {using time-sharing}
- H04L 27/2605: {Symbol extensions, e.g. Zero Tail, Unique Word [UW]}
- H04L 27/2614: {Peak power aspects}
- H04L 27/36: Modulator circuits; Transmitter circuits
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

Radio frequency (RF) communication systems with dynamic waveform control and power boost are provided herein. In certain embodiments, an RF communication system includes a power amplifier configured to amplify an RF signal to generate an RF transmit signal for transmission over a time-division duplex (TDD) communication link having a duty cycle, and a transmitter configured to provide the RF signal to the power amplifier. The transmitter is operable to change a type of waveform of the RF signal from a first waveform type to a second waveform type in response to a decrease in a signal-to-noise ratio (SNR) of the TDD communication link, and to boost a power of the RF transmit signal by an amount based on the duty cycle.

## Claims

### Claim 1

A radio frequency communication system comprising:
a power amplifier configured to amplify a radio frequency signal to generate a radio frequency transmit signal for transmission over a time-division duplex communication link having a duty cycle; and
a transmitter configured to provide the radio frequency signal to the power amplifier, the transmitter operable to change a type of waveform of the radio frequency signal from a first waveform type to a second waveform type in response to a decrease in a signal-to-noise ratio of the time-division duplex communication link, and to boost a power of the radio frequency transmit signal by an amount based on the duty cycle.

### Claim 2 (depends on 1)

The radio frequency communication system of claim 1 wherein the time-division duplex communication link includes a plurality of available transmit frames, the radio frequency communication system further operable to select the amount of boost based on a number of utilized transmit frames in which the transmitter transmits the radio frequency transmit signal.

### Claim 3 (depends on 2)

The radio frequency communication system of claim 2 wherein the transmitter is further operable to decrease the number of utilized transmit frames and to increase the amount of boost.

### Claim 4 (depends on 1)

The radio frequency communication system of claim 1 wherein the transmitter is further configured to select the amount of boost based on a specific absorption rate value.

### Claim 5 (depends on 1)

The radio frequency communication system of claim 1 wherein the second waveform type has lower peak to average power ratio than the first waveform type.

### Claim 6 (depends on 1)

The radio frequency communication system of claim 1 wherein the second waveform type includes discrete Fourier transformation spreading and the first waveform type includes a cyclic prefix coding.

### Claim 7 (depends on 1)

The radio frequency communication system of claim 1 wherein the first waveform type is modulated with quadrature phase shift keying and the second waveform type is modulated with binary phase shift keying.

### Claim 8

A method of wireless communication, the method comprising:
generating a radio frequency signal using a transmitter of a radio frequency communication system;
transmitting the radio frequency signal over a time-division duplex communication link having a duty cycle; and
in response to a decrease in a signal-to-noise ratio of the time-division duplex communication link, boosting a power of the radio frequency transmit signal by an amount based on the duty cycle and changing a type of waveform of the radio frequency signal from a first waveform type to a second waveform type.

### Claim 9 (depends on 8)

The method of claim 8 wherein the time-division duplex communication link includes a plurality of available transmit frames, the method further comprising selecting the amount of boost based on a number of utilized transmit frames in which the radio frequency signal is transmitted.

### Claim 10 (depends on 9)

The method of claim 9 further comprising decreasing the number of utilized transmit frames and increasing the amount of boost.

### Claim 11 (depends on 8)

The method of claim 8 further comprising selecting the amount of boost based on a specific absorption rate value.

### Claim 12 (depends on 8)

The method of claim 8 wherein the second waveform type has lower peak to average power ratio than the first waveform type.

### Claim 13 (depends on 8)

The method of claim 8 wherein the first waveform type is modulated with quadrature phase shift keying and the second waveform type is modulated with binary phase shift keying.

### Claim 14

A module for a radio frequency communication system, the module comprising:
a laminated substrate; and
one or more semiconductor dies attached to the laminated substrate, the one or more semiconductor dies including a power amplifier configured to amplify a radio frequency signal to generate a radio frequency transmit signal for transmission over a time-division duplex communication link having a duty cycle, and a transmitter configured to provide the radio frequency signal to the power amplifier, the transmitter operable to change a type of waveform of the radio frequency signal from a first waveform type to a second waveform type in response to a decrease in a signal-to-noise ratio of the time-division duplex communication link, and to boost a power of the radio frequency transmit signal by an amount based on the duty cycle.

### Claim 15 (depends on 14)

The module of claim 14 wherein the time-division duplex communication link includes a plurality of available transmit frames, the transmitter further operable to select the amount of boost based on a number of utilized transmit frames in which the radio frequency transmit signal is transmitted.

### Claim 16 (depends on 15)

The module of claim 15 wherein the transmitter is further operable to decrease the number of utilized transmit frames and to increase the amount of boost.

### Claim 17 (depends on 14)

The module of claim 14 wherein the transmitter is further operable to select the amount of boost based on a specific absorption rate value.

### Claim 18 (depends on 14)

The module of claim 14 wherein the second waveform type has lower peak to average power ratio than the first waveform type.

### Claim 19 (depends on 14)

The module of claim 14 wherein the second waveform type includes discrete Fourier transformation spreading and the first waveform type includes a cyclic prefix coding.

### Claim 20 (depends on 14)

The module of claim 14 wherein the first waveform type is modulated with quadrature phase shift keying and the second waveform type is modulated with binary phase shift keying.