APPARATUS AND METHOD FOR REDUCING PAPR OF PREAMBLE SIGNAL IN DIGITAL BROADCASTING SYSTEM

• US 20140307831A1
• Filed: 06/26/2014
• Published: 10/16/2014
• Est. Priority Date: 04/28/2008
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: YUN, Sung-Ryul, KWON, Hwan-Joon, KIM, Jae-Yoel, LIM, Yeon-Ju, LEE, Hak-Ju, JEONG, Hong-Sil, MYUNG, Seho
• Granted Patent: US 9,407,488 B2
• Time in Patent Office: Days
• US Class Current: 375/296
• CPC Class Codes: H04L 27/2618 Reduction thereof using auxiliary subcarriers
• CPC Class Codes: H04L 27/26522 using partial FFTs

Abstract

Methods and apparatuses are provided for reducing a Peak to Average Power Ratio (PAPR) in a digital broadcasting system. Reserved tones are determined in previously determined locations of sub-carriers that do not collide with a pilot signal of a preamble in a frame. A signal is transmitted through the reserved tones in a period for which the preamble is transmitted. If a Fast Fourier Transform (FFT) size is 8K, locations of the reserved tones are determined in accordance with a specified chart.

Claims

1. A method for reducing a Peak to Average Power Ratio (PAPR) in a digital broadcasting system, comprising:

determining reserved tones in previously determined locations of sub-carriers that do not collide with a pilot signal of a preamble in a frame; and

transmitting a signal through the reserved tones in a period for which the preamble is transmitted,

wherein if a Fast Fourier Transform (FFT) size is 8K, locations of the reserved tones are determined in accordance with;

2. The method of claim 1, wherein the digital broadcasting system uses Orthogonal Frequency Division Multiplexing (OFDM) as a transmission scheme.

3. The method of claim 1, wherein when the FFT size is 16K, the locations of the reserved tones are determined in accordance with:

4. The method of claim 1, wherein when the FFT size is 32K, the locations of the reserved tones are determined in accordance with:

5. The method of claim 2, wherein when OFDM supports a plurality of FFT sizes, the locations of the reserved tones are determined in accordance with:

6. The method of claim 1, wherein the preamble comprises a P2 symbol that carries signaling information of a physical layer in a digital video broadcasting (DVB) system.

7. The method of claim 1, wherein transmitting the signal further comprises adding the signal having an impulse characteristic to an information signal that is transmitted through data tones in the preamble, using a gradient algorithm for PAPR reduction.

8. A transmission apparatus for reducing a Peak to Average Power Ratio (PAPR) in a digital broadcasting system, comprising:

a controller for determining reserved tones in previously determined locations of sub-carriers that do not collide with a pilot signal of a preamble in a frame; and

a transmission unit for transmitting a signal through the reserved tones in a period for which the preamble is transmitted,

wherein if a Fast Fourier Transform (FFT) size is 8K, locations of the reserved tones are determined in accordance with;

9. The transmission apparatus of claim 8, wherein the digital broadcasting system uses Orthogonal Frequency Division Multiplexing (OFDM) as a transmission scheme.

10. The transmission apparatus of claim 8, wherein when the FFT size is 16K, the locations of the reserved tones are determined in accordance with:

11. The transmission apparatus of claim 8, wherein when the FFT size is 32K, the locations of the reserved tones are determined in accordance with:

12. The transmission apparatus of claim 9, wherein when OFDM supports a plurality of FFT sizes, the locations of the reserved tones are determined in accordance with:

13. The transmission apparatus of claim 8, wherein the preamble comprises a P2 symbol that carries signaling information of a physical layer in a digital video broadcasting (DVB) system.

14. The transmission apparatus of claim 8, wherein the transmission unit further comprises a gradient unit that adds the signal having an impulse characteristic to an information signal that is transmitted through data tones in the preamble, using a gradient algorithm for PAPR reduction.

15. A receiving apparatus for reducing a Peak to Average Power Ratio (PAPR) in a digital broadcasting system, the apparatus comprising:

a memory storing previously determined locations of sub-carriers; and

the apparatus being arranged to receive a signal through reserved tones in the previously determined locations of sub-carriers that do not collide with a pilot signal of a preamble in a frame,

wherein if a Fast Fourier Transform (FFT) size is 8K, locations of the reserved tones are determined in accordance with;

16. The receiving apparatus of claim 15, wherein when the FFT size is 16K, the locations of the reserved tones are determined in accordance with:

17. The receiving apparatus of claim 15, wherein when the FFT size is 32K, the locations of the reserved tones are determined in accordance with:

18. The receiving apparatus of claim 15, wherein the digital broadcasting system uses Orthogonal Frequency Division Multiplexing (OFDM) as a transmission scheme.

19. The receiving apparatus of claim 18, wherein when OFDM supports a plurality of FFT sizes, the locations of the reserved tones are determined in accordance with:

20. The receiving apparatus of claim 15, wherein the preamble comprises a P2 symbol that carries signaling information of a physical layer in a Digital Video Broadcasting (DVB) system.