Transmitting apparatus and receiving apparatus and controlling method thereof

Patent metadata

Field	Value
Publication number	US-10050730-B2
Application number	US-201615288848-A
Country	US
Kind code	B2
Filing date	Oct 7, 2016
Priority date	Feb 13, 2015
Publication date	Aug 14, 2018
Grant date	Aug 14, 2018

Abstract

A transmitting apparatus is provided. The transmitting apparatus includes: a frame generator configured to generate a frame including a plurality of orthogonal frequency-division multiplexing (OFDM) symbols; and a guard interval (GI) inserter configured to insert GIs into the generated frame, wherein the plurality of OFDM symbols are divided into a bootstrap, a preamble, and a payload, and the GI inserter inserts first GIs having a size corresponding to a fast Fourier transform (FFT) size of each of OFDM symbols configuring the payload into front ends of each of the OFDM symbols, inserts second GIs having a size corresponding to a quotient obtained by dividing an extra region of the payload calculated based on the FFT size of the OFDM symbols configuring the payload, the number of OFDM symbols, and the size of the first GIs by the number of OFDM symbols into front ends of each of the first GIs, and inserts a cyclic postfix (CP) having a size corresponding to the remainder remaining after dividing the extra region of the payload by the number of OFDM symbols into a rear end of a final OFDM symbol configuring the payload.

First claim

What is claimed is:

1. A controlling method of a transmitting apparatus, the controlling method comprising:
generating a frame comprising a plurality of orthogonal frequency-division multiplexing (OFDM) symbols; and
inserting one or more guard intervals (GIs) into the frame,
wherein the frame comprises a bootstrap, a preamble and a payload,
wherein the payload comprises at least one subframe,
wherein the one or more GIs comprise a first GI and a second GI,
wherein the first GI and the second GI are inserted into a front end of an OFDM symbol among OFDM symbols of the payload,
wherein a size of the first GI is obtained based on a Fast Fourier Transform (FFT) size of the at least one subframe,
wherein a size of the second GI is obtained based on a quotient which is obtained by dividing an extra part of the frame by a number of the OFDM symbols of the payload, and
wherein the extra part of the frame is obtained based on the FFT size of the at least one subframe, the number of the OFDM symbols of the payload, and the size of the first GI.

2. The controlling method of a transmitting apparatus as claimed in claim 1 , wherein the one or more GIs comprise a cyclic postfix (CP),
wherein the cyclic postfix is inserted into a rear end of a final OFDM symbol of the payload, and
wherein a size of the CP is obtained based on a remainder which is obtained by dividing the extra part of the frame by the number of the OFDM symbols of the payload.

3. The controlling method of a transmitting apparatus as claimed in claim 2 , wherein the CP comprises portions of the final OFDM symbol of the OFDM symbols of the payload.

4. The controlling method of a transmitting apparatus as claimed in claim 2 , wherein the first GI and the second GI comprise portions of each of the OFDM symbols of the payload.

5. The controlling method of a transmitting apparatus as claimed in claim 3 , wherein the CP comprises samples, among a plurality of samples of the final OFDM symbol of the OFDM symbols of the payload, from a start point of the final OFDM symbol to a point corresponding to a size of the remainder.

6. The controlling method of a transmitting apparatus as claimed in claim 4 , wherein the first GI and the second GI comprise samples, among a plurality of samples of each of the OFDM symbols of the payload, from a final point of each of the OFDM symbols of the payload to a point corresponding to a sum of a size corresponding to the FFT size of the at least one subframe and a size of the quotient.

7. The controlling method of a transmitting apparatus as claimed in claim 1 , further comprising generating information, the information comprising information on whether the extra part of the frame is distributed and information on a disposition reference of the extra part.

8. The controlling method of a transmitting apparatus as claimed in claim 7 , further comprising transmitting the frame including the information.

9. The controlling method of a transmitting apparatus as claimed in claim 1 , wherein the second GI is inserted into a front end of the first GI.

10. The controlling method of a transmitting apparatus as claimed in claim 1 , a length of the frame is a predetermined length.

Assignees

• Samsung Electronics Co Ltd

Inventors

• Bae Jae-Hyeon
• Oh Young-Ho
• Hwang Sung-Hee

Classifications

• H04L27/2607

  Cyclic extensions · CPC title

• H04L5/0007

  the frequencies being orthogonal, e.g. OFDM(A) or DMT · CPC title

• H04L69/22

  Parsing or analysis of headers · CPC title

• H04L27/2608

  Electricity · mapped topic

• H04L27/2602

  Signal structure · CPC title