METHOD AND APPARATUS FOR ADDITION DATA TRANSMISSION AND RECEPTION IN DIGITAL BROADCAST SYSTEM

• US 20130142219A1
• Filed: 11/23/2012
• Published: 06/06/2013
• Est. Priority Date: 12/01/2011
• Status: Active Grant

• Current Assignee: Electronics and Telecommunications Research Institute, Korean Broadcasting System (Government of South Korea), NextWill Co., Ltd.
• Original Assignee: Electronics and Telecommunications Research Institute, Korean Broadcasting System (Government of South Korea), NextWill Co., Ltd.
• Inventors: Hur, Nam Ho, Park, Sung Ik, Lim, Hyoungsoo, Eum, Ho Min, Seo, Jae Hyun, Kim, Heung Mook, Suh, Young Woo, Lee, Jae Kwon, Mok, Ha Kyun, Seo, Won Gi, Kim, Ju Byung
• Granted Patent: US 8,837,553 B2
• Time in Patent Office: Days
• US Class Current: 375/140
• CPC Class Codes: H04B 1/707 using direct sequence modulation
• CPC Class Codes: H04H 20/30 by a single channel
• CPC Class Codes: H04H 60/07 characterised by processes or methods for the generation
• CPC Class Codes: H04N 21/2383 Channel coding or modulation of digital bit-stream, e.g. QPSK modulation arrangements for detecting or preventing errors in the information received by adapting the channel coding H04L1/0009; analogue front ends or means for connecting modulators, demodulators or transceivers to a transmission line H04L27/0002
• CPC Class Codes: H04N 21/4382 Demodulation or channel decoding, e.g. QPSK demodulation analog front ends or means for connecting modulators, demodulators or transceivers to a transmission line H04L27/0002
• CPC Class Codes: H04N 21/8126 involving additional data, e.g. news, sports, stocks, weather forecasts

Abstract

Provided are an apparatus for addition data transmission includes: an IF broadcasting signal generating unit receiving the broadcast data, and FEC and modulation of the received broadcast data to generate a broadcasting signal in an intermediate frequency (IF) band; an IF addition signal generating unit receiving the addition data to generate an addition signal in the IF band by using direct sequence spread spectrum (DSSS); an average power controlling unit controlling average power of the addition signal in the IF band; a signal combining unit combining the broadcasting signal in the IF band and the addition signal in the IF band to generate a combination signal; an RF upward converting unit upwardly converting the combination signal in a signal in a radio frequency (RF) band to a combination signal in the RF band; and a transmitting unit transmitting the combination signal in the RF band.

Claims

1. An apparatus for broadcast data and addition data transmission in a digital broadcast system, the apparatus comprising:

an IF broadcasting signal generating unit receiving the broadcast data, and FEC and modulation of the received broadcast data to generate a broadcasting signal in an intermediate frequency (IF) band;

an IF addition signal generating unit receiving the addition data to generate an addition signal in the IF band by using direct sequence spread spectrum (DSSS);

an average power controlling unit controlling average power of the addition signal in the IF band;

a signal combining unit combining the broadcasting signal in the IF band and the addition signal in the IF band to generate a combination signal;

an RF upward converting unit upwardly converting the combination signal in a signal in a radio frequency (RF) band to a combination signal in the RF band; and

a transmitting unit transmitting the combination signal in the RF band.

2. The apparatus of claim 1, wherein the addition signal in the IF band and the broadcasting signal in the IF band have the same IF band.

3. The apparatus of claim 1, wherein the IF addition signal generating unit includes,

an FEC encoding unit FEC-encoding the addition data;

a symbol mapper converting the FEC-encoded addition data into a symbol to generate symbol-type addition data;

a signal synthesizing unit generating a spread addition signal based on the symbol-type addition data and an orthogonal or quasi-orthogonal signal for spectrum-spreading the addition data;

a pulse shaping filter (PSF) band-limiting the spread addition signal to be converted into a spectrum of a pattern suitable for a wireless broadcasting channel to thereby a baseband addition signal; and

an IF upward converting unit upwardly converting the baseband addition signal to generate the addition signal in the IF band.

4. The apparatus of claim 3, wherein the IF addition signal generating unit further to includes,

a preamble signal generating portion generating a preamble signal which is repeated periodically;

and

a multiplexing portion performing serial concatenation of the preamble signal and the spread addition signal.

5. The apparatus of claim 3, wherein a sampling frequency of the spread addition signal is integer (N) times more than a sampling frequency of the symbol mapper.

6. The apparatus of claim 1, wherein the average power controlling unit includes,

a first average power calculating unit calculating average power of the broadcasting signal in the IF band;

a second average power calculating unit calculating average power of the addition signal in the IF band;

an insertion level determining unit comparing the average power of the broadcasting signal in the IF band and the average power of the addition signal in the IF band to determine an insertion level, the insertion level being a constant that makes the average power of the addition signal be significantly lower than the average power of the broadcasting signal; and

a multiplying unit multiplying the addition signal in the IF band by the insertion level.

7. An apparatus for broadcast data and addition data transmission in a digital broadcast system, the apparatus comprising:

an IF broadcasting signal generating unit receiving the broadcast data, and FEC and modulation of the received broadcast data to generate a broadcasting signal in an intermediate frequency (IF) band;

a first RF upward converting unit upwardly converting the broadcasting signal in the IF band into a signal in a radio frequency (RF) band to generate a broadcasting signal in the RF band;

an IF addition signal generating unit receiving the addition data to generate an addition signal in the IF band by using direct sequence spread spectrum (DSSS);

a second RF upward converting unit upwardly converting the addition signal in the IF band into the signal in the RF band to an addition signal in the RF band;

an average power controlling unit controlling average power of the addition signal in the RF band;

a signal combining unit combining the broadcasting signal in the RF band and the addition signal in the RF band to generate a combination signal in the RF band; and

a transmitting unit transmitting the combination signal in the RF band.

8. The apparatus of claim 7, wherein the IF addition signal generating unit includes,

an FEC encoding unit FEC-encoding the addition data;

a symbol mapper converting the FEC-encoded addition data into a symbol to generate symbol-type addition data;

a signal synthesizing unit generating a spread addition signal based on the symbol-type addition data and an orthogonal or quasi-orthogonal signal for spectrum-spreading the addition data;

a pulse shaping filter (PSF) band-limiting the spread addition signal to be converted into a spectrum of a pattern suitable for a wireless broadcasting channel to thereby a baseband addition signal; and

an IF upward converting unit upwardly converting the baseband addition signal to generate the addition signal in the IF band.

9. The apparatus of claim 7, wherein the average power controlling unit includes,

a first average power calculating unit calculating average power of the broadcasting signal in the RF band;

a second average power calculating unit calculating average power of the addition signal in the RF band;

an insertion level determining unit comparing the average power of the broadcasting signal in the RF band and the average power of the addition signal in the RF band to determine an insertion level, the insertion level being a constant that makes the average power of the addition signal be significantly lower than the average power of the broadcasting signal; and

a multiplying unit multiplying the addition signal in the RF band by the insertion level.

10. An apparatus for broadcast data and addition data reception in a digital broadcast system, the apparatus comprising:

a receiving unit receiving a combination signal in a radio frequency (RF) band;

an IF downward converting unit downwardly converting the combination signal into a signal in an intermediate frequency (IF) band to generate a combination signal in the IF band;

a broadcast data outputting unit receiving the combination signal in the IF band, and demodulating and FEC-decoding the received combination signal to output the broadcast data; and

an addition data outputting unit receiving the combination signal in the IF band to output the addition data by using direct sequence spread spectrum (DSSS).

11. The apparatus of claim 10, wherein the addition data outputting unit includes,

a base band downward converting unit downwardly converting the combination signal in the IF band to generate a baseband combination signal;

a synchronizing unit synchronizing the baseband combination signal;

a back-spreading unit back-spreading the synchronized combination signal; and

an FEC decoding unit FEC-decoding the back-spread combination signal to output the addition data.

12. An apparatus for addition data reception in a digital broadcast system, the apparatus comprising:

a receiving unit receiving a combination signal in a radio frequency (RF) band;

an IF downward converting unit downwardly converting the combination signal into a signal in an intermediate frequency (IF) band to generate a combination signal in the IF band; and

an addition data outputting unit receiving the combination signal in the IF band to output the addition data by using direct sequence spread spectrum (DSSS).

13. The apparatus of claim 12, wherein the addition data outputting unit includes,

a base band downward converting unit downwardly converting the combination signal in the IF band to generate a baseband combination signal;

a synchronizing unit synchronizing the baseband combination signal;

a back-spreading unit back-spreading the synchronized combination signal; and

an FEC decoding unit FEC-decoding the back-spread combination signal to output the addition data.

14. A method for broadcast data and addition data transmission in a digital broadcast system, the method comprising:

receiving the broadcast data, and FEC and modulation of the received broadcast data to generate a broadcasting signal in an intermediate frequency (IF) band;

receiving the addition data to generate an addition signal in the IF band by using direct sequence spread spectrum (DSSS);

controlling average power of the addition signal in the IF band;

combining the broadcasting signal in the IF band and the addition signal in the IF band to generate a combination signal;

upwardly converting the combination signal in a signal in a radio frequency (RF) band to a combination signal in the RF band; and

transmitting the combination signal in the RF band.

15. The method of claim 14, wherein the generating of the IF addition signal includes,

FEC-encoding the addition data;

converting the FEC-encoded addition data into a symbol to generate symbol-type addition data;

generating a spread addition signal based on the symbol-type addition data and an orthogonal or quasi-orthogonal signal for spectrum-spreading the addition data;

band-limiting the spread addition signal to be converted into a spectrum of a pattern suitable for a wireless broadcasting channel to thereby a baseband addition signal; and

upwardly converting the baseband addition signal to generate the addition signal in the IF band.

16. The method of claim 14, wherein the controlling of the average power includes,

calculating first average power of the broadcasting signal in the IF band;

calculating second average power of the addition signal in the IF band;

comparing the average power of the broadcasting signal in the IF band and the average power of the addition signal in the IF band to determine an insertion level, the insertion level being a constant that makes the average power of the addition signal be significantly lower than the average power of the broadcasting signal; and

multiplying the addition signal in the IF band by the insertion level.

17. A method for broadcast data and addition data reception in a digital broadcast system, the method comprising:

receiving a combination signal in a radio frequency (RF) band;

downwardly converting the combination signal into a signal in an intermediate frequency (IF) band to generate a combination signal in the IF band;

receiving the combination signal in the IF band, and demodulating and FEC-decoding the received combination signal to output the broadcast data; and

receiving the combination signal in the IF band to output the addition data by using direct sequence spread spectrum (DSSS).

18. The method of claim 17, wherein the outputting of the addition data includes,

downwardly converting the combination signal in the IF band to generate a baseband combination signal;

synchronizing the baseband combination signal;

back-spreading the synchronized combination signal; and

FEC-decoding the back-spread combination signal to output the addition data.