# US 2018/0026822 A1 · Apparatus for receiving broadcast signals and method for receiving broadcast signals

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- Number: US 2018/0026822 A1
- Document ID: US20180026822A1
- Status: Published application
- Kind: A1
- Application number: 15/710,081
- Filed: 2017-09-20
- Published: 2018-01-25
- Earliest claimed: 2015-09-10
- Assignees: LG Electronics Inc.
- Applicants: LG Electronics Inc.
- Inventors: Jaehyung KIM; Woosuk KO; Sungryong HONG
- Web page: https://patentgrep.com/patent/US20180026822A1

## CPC

- H04L 27/2614: {Peak power aspects}
- H04B 1/00: Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B 7/00: Radio transmission systems, i.e. using radiation field (H04B10/00, H04B15/00 take precedence)
- H04L 5/0044: {Allocation of payload; Allocation of data channels, e.g. PDSCH or PUSCH}
- H04L 27/22: Demodulator circuits; Receiver circuits
- H04L 27/2602: {Signal structure}
- H04L 27/2607: {Cyclic extensions}
- H04L 27/2627: {Modulators}
- H04L 27/2634: {Inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators in combination with other circuits for modulation}
- H04L 27/2647: {Arrangements specific to the receiver only (equalisation H04L27/01)}
- 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)}
- H04L 27/26524: {Fast Fourier transform [FFT] or discrete Fourier transform [DFT] demodulators in combination with other circuits for demodulation}
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H04B: TRANSMISSION

## Abstract

A method for receiving broadcast signals by an apparatus for receiving broadcast signals, the method includes receiving the broadcast signals having Orthogonal Frequency Division Multiplex (OFDM) symbols including at least one preamble OFDM symbol and at least one data OFDM symbol on which power normalization is performed by using power normalization factors acquired from a frequency domain total power for the OFDM symbols; demodulating the at least one preamble OFDM symbol and the at least one data OFDM symbol into at least one preamble symbol and at least one data symbol by an OFDM scheme; parsing at least one signal frame including the at least one preamble symbol for signaling data and the at least one data symbol for service data; decoding the signaling data; and decoding the service data.

## Claims

### Claim 1

A method for receiving broadcast signals by an apparatus for receiving broadcast signals, the method comprising:
receiving the broadcast signals having Orthogonal Frequency Division Multiplex (OFDM) symbols including at least one preamble OFDM symbol and at least one data OFDM symbol on which power normalization is performed by using power normalization factors acquired from a frequency domain total power for the OFDM symbols;
demodulating the at least one preamble OFDM symbol and the at least one data OFDM symbol into at least one preamble symbol and at least one data symbol by an OFDM scheme;
parsing at least one signal frame including the at least one preamble symbol for signaling data and the at least one data symbol for service data;
decoding the signaling data; and
decoding the service data,
wherein at least one first power normalization factor applied to the at least one preamble OFDM symbol is different from at least one second power normalization factor applied to the at least one data OFDM symbol, and
wherein the frequency domain total power of the at least one preamble OFDM symbol is set to 7985.96 when a Fast Fourier Transform (FFT) size is 8K points, a guard interval length is 1536 samples of the at least one preamble OFDM symbol, separation of scattered pilot bearing carriers is 4 carriers and carrier reduction (Cred) coefficient is 1 for the at least one preamble OFDM symbol.

### Claim 2 (depends on 1)

The method of claim 1, wherein the at least one signal frame includes at least one subframe in which the at least one data symbol and at least one subframe boundary symbol are positioned, and
wherein the at least one first power normalization factor corresponds to each preamble symbol and the at least one second power normalization factor corresponds to each subframe.

### Claim 3 (depends on 2)

The method of claim 2, wherein the at least one second power normalization factor is acquired from a frequency domain total power of the at least one data symbol and the at least one subframe boundary symbol in each subframe, and wherein a same second power normalization factor is applied to the at least one subframe boundary symbol and the at least one data symbol.

### Claim 4 (depends on 1)

The method of claim 1, wherein the power normalization factors being used in the power normalization vary according to the Cred coefficient.

### Claim 5 (depends on 1)

The method of claim 1, wherein the power normalization factors being used in the power normalization vary according to the FFT of the OFDM symbols.

### Claim 6

An apparatus for receiving broadcast signals, the apparatus comprising:
a tuner to receive the broadcast signals having Orthogonal Frequency Division Multiplex (OFDM) symbols including at least one preamble OFDM symbol and at least one data OFDM symbol on which power normalization is performed by using power normalization factors acquired from a frequency domain total power for the OFDM symbols;
a demodulator to demodulate the at least one preamble OFDM symbol and the at least one data OFDM symbol into at least one preamble symbol and at least one data symbol by an OFDM scheme;
a frame parser to parse at least one signal frame including the at least one preamble symbol for signaling data and the at least one data symbol for service data;
a first decoder to decode the signaling data; and
a second decoder to decode the service data,
wherein at least one first power normalization factor applied to the at least one preamble OFDM symbol is different from at least one second power normalization factor applied to the at least one data OFDM symbol, and
wherein the frequency domain total power of the at least one preamble OFDM symbol is set to 7985.96 when a Fast Fourier Transform (FFT) size is 8K points, a guard interval length is 1536 samples of the at least one preamble OFDM symbol, separation of scattered pilot bearing carriers is 4 carriers and carrier reduction (Cred) coefficient is 1 for the at least one preamble OFDM symbol.

### Claim 7 (depends on 6)

The apparatus of claim 6, wherein the at least one signal frame includes at least one subframe in which the at least one data symbol and at least one subframe boundary symbol are positioned, and
wherein the at least one first power normalization factor corresponds to each preamble symbol and the at least one second power normalization factor corresponds to each subframe.

### Claim 8 (depends on 7)

The apparatus of claim 7, wherein the at least one second power normalization factor is acquired from a frequency domain total power of the at least one data symbol and the at least one subframe boundary symbol in each subframe, and wherein a same second power normalization factor is applied to the at least one subframe boundary symbol and the at least one data symbol.

### Claim 9 (depends on 6)

The apparatus of claim 6, wherein the power normalization factors being used in the power normalization vary according to the Cred coefficient.

### Claim 10 (depends on 6)

The apparatus of claim 6, wherein the power normalization factors being used in the power normalization vary according to the FFT of the OFDM symbols.