# US 2018/0324005 A1 · Method and apparatus for transmitting and receiving signal for low peak-to-average power ratio in wireless communication system

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- Number: US 2018/0324005 A1
- Document ID: US20180324005A1
- Status: Published application
- Kind: A1
- Application number: 15/971,471
- Filed: 2018-05-04
- Published: 2018-11-08
- Earliest claimed: 2017-05-04
- Assignees: Samsung Electronics Co., Ltd.
- Applicants: Samsung Electronics Co., Ltd.
- Inventors: Chanhong KIM; Yeohun YUN; Yongok KIM; Jongbu LIM; Sungnam HONG; Taeyoung KIM
- Web page: https://patentgrep.com/patent/US20180324005A1

## CPC

- H04L 25/03834: {using pulse shaping}
- H03H 17/04: Recursive filters
- H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT}
- H04L 27/2035: {using a single or unspecified number of carriers}
- H04L 27/2614: {Peak power aspects}
- H04L 27/2636: {with FFT or DFT modulators, e.g. standard single-carrier frequency-division multiple access [SC-FDMA] transmitter or DFT spread orthogonal frequency division multiplexing [DFT-SOFDM]}
- H04L 27/26362: {Subcarrier weighting equivalent to time domain filtering, e.g. weighting per subcarrier multiplication (arrangements for removing intersymbol interference at the transmitter end H04L25/03343)}
- H04L 5/023: {Multiplexing of multicarrier modulation signals, e.g. multi-user orthogonal frequency division multiple access [OFDMA] (multicarrier modulation H04L27/2601)}
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H03H: IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS (waveguides, resonators, lines or other devices of the waveguide type H01P)

## Abstract

The present disclosure relates to a communication method and system for converging a 5G communication system for supporting higher data rates beyond a 4G system with an IoT technology. The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. The present disclosure can reduces a peak-to-average power ration (PAPR) by performing time domain cyclic filtering. Further, a data rate or coverage can be improved by selectively transmitting transmission waveforms through cyclic prefix (CP)-orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform-spread-OFDM (DFT-s-OFDM).

## Claims

### Claim 1

A method for transmitting a signal by a communication device in a wireless communication system, the method comprising:
determining a coefficient used for spectrum shaping, the coefficient satisfying a predetermined maximum number of filter taps;
performing the spectrum shaping based on the coefficient to reduce a peak-to-average power ratio (PAPR) for the signal.

### Claim 2 (depends on 1)

The method of claim 1, wherein the communication device is a user equipment (UE) and the signal is an uplink signal.

### Claim 3 (depends on 1)

The method of claim 1, wherein the predetermined maximum number of filter taps is 2 or 3.

### Claim 4 (depends on 1)

The method of claim 1, wherein the coefficient used is determined based on at least one of a power normalization, characteristics of a filter coefficient, or dependency on a discrete Fourier transform (DFT) size.

### Claim 5 (depends on 4)

The method of claim 4, wherein the characteristics of the filter coefficient corresponds to at least one of a real-symmetric filter, a conjugate-symmetric filter, an equal-gain filter, or a low-pass filter.

### Claim 6 (depends on 1)

The method of claim 1,
wherein a time-domain spectrum shaping filter hss[i] associated with the spectrum shaping satisfies:
h
ss

[
i
]
=
1
2

δ

[
i
]
-
1
2

δ

[
i
-
1
]
,
and
wherein δ[i] is a delta function.

### Claim 7 (depends on 1)

The method of claim 1,
wherein a time-domain spectrum shaping filter hss[i] associated with the spectrum shaping satisfies:
h
ss

[
i
]
=
1
2

δ

[
i
]
-
1
2

e
-
j

π
M
sc
PUSCH

δ

[
i
-
1
]
,
wherein δ[i] is a delta function, and
wherein the MscPUSCH is a discrete Fourier transform (DFT) size during a physical uplink shared channel (PUSCH) transmission.

### Claim 8 (depends on 1)

The method of claim 1, wherein the spectrum shaping is applied only during transmission of the π/2-binary phase shift keying (BPSK) discrete Fourier transform-spread-orthogonal frequency division multiplexing (DFT-s-OFDM).

### Claim 9

A communication device for transmitting a signal in a wireless communication system, the communication device comprising:
a transceiver; and
a controller coupled with the transceiver and configured to control to:
determine a coefficient used for spectrum shaping, the coefficient satisfying a predetermined maximum number of filter taps,
performing the spectrum shaping based on the coefficient to reduce a peak-to-average power ratio (PAPR) for the signal.

### Claim 10 (depends on 9)

The communication device of claim 9, wherein the communication device is a user equipment (UE) and the signal is an uplink signal.

### Claim 11 (depends on 9)

The communication device of claim 9, wherein the predetermined maximum number of filter taps is 2 or 3.

### Claim 12 (depends on 9)

The communication device of claim 9, wherein the coefficient used for the spectrum shaping is determined based on at least one of a power normalization, characteristics of a filter coefficient, or dependency on a discrete Fourier transform (DFT) size.

### Claim 13 (depends on 12)

The communication device of claim 12, wherein the characteristics of the filter coefficient are associated with at least one of a real-symmetric filter, a conjugate-symmetric filter, an equal-gain filter, or a low-pass filter.

### Claim 14 (depends on 9)

The communication device of claim 9, wherein a time-domain spectrum shaping filter hss[i] associated with the spectrum shaping satisfies:
h
ss

[
i
]
=
1
2

δ

[
i
]
-
1
2

δ

[
i
-
1
]
,
and
wherein δ[i] is a delta function.

### Claim 15 (depends on 9)

The communication device of claim 9, wherein a time-domain spectrum shaping filter hss[i] associated with the spectrum shaping satisfies:
h
ss

[
i
]
=
1
2

δ

[
i
]
-
1
2

e
-
j

π
M
sc
PUSCH

δ

[
i
-
1
]
,
wherein δ[i] is the delta function, and
wherein the MscPUSCH is a discrete Fourier transform (DFT) size during a physical uplink shared channel (PUSCH) transmission.

### Claim 16 (depends on 9)

The communication device of claim 9, wherein the spectrum shaping is applied only during transmission of the π/2-binary phase shift keying (BPSK) discrete Fourier transform-spread-orthogonal frequency division multiplexing (DFT-s-OFDM).