Method, apparatus, and system for transmitting and receiving data in a digital broadcasting system using a single frequency network

• US 20060268673A1
• Filed: 04/19/2006
• Published: 11/30/2006
• Est. Priority Date: 04/19/2005
• Status: Abandoned Application

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Jung, Suk-Jin, Kim, Min-Goo, Lee, Kyung-Ha, Roh, Hee-Jin
• Application Number:
  US11/406,602
• Publication Number:
  US 20060268673A1
• Time in Patent Office: Days
• US Class Current: 370/203
• CPC Class Codes: H04H 20/67 Common-wave systems, i.e. using separate transmitters operating on substantially the same frequency
• CPC Class Codes: H04H 60/23 using cryptography, e.g. encryption, authentication, key distribution
• CPC Class Codes: H04H 60/50 of broadcast or relay stations
• CPC Class Codes: H04L 27/2602 Signal structure
• CPC Class Codes: H04L 27/2603 Signal structure ensuring backward compatibility with legacy system
• CPC Class Codes: H04L 27/26035 Maintenance of orthogonality, e.g. for signals exchanged between cells or users, or by using covering codes or sequences using different training sequence per antenna H04B7/0684; code allocation H04J13/16

Abstract

A method, apparatus, and system for transmitting and receiving data in a digital broadcasting system based on Orthogonal Frequency Division Multiplexing (OFDM) are provided. A transmitter frames input bit information in a predetermined bit unit, maps the framed input bit information to a transmitter identification indicator (TII) using a predefined number of orthogonal sets, and modulates the TII to an OFDM symbol to transmit the OFDM symbol. A receiver demodulates an OFDM symbol, detects a TII symbol from a predefined orthogonal signal set, demaps predetermined bits from the TII, and concatenates the demapped bits in a predetermined period unit to output bit information. Therefore, the TII can be stably received as a conditional access signal for distinguishing a broadcasting network and a relay network in the digital broadcasting system.

Claims

1. A method for transmitting information using a transmitter identification indicator (TII) in a digital broadcasting system, comprising the steps of:

framing input bit information in a predetermined bit unit;

mapping the framed input bit information to the TII using a predefined orthogonal set; and

modulating the TII to an Orthogonal Frequency Division Multiplexing (OFDM) symbol and transmitting the OFDM symbol.

2. The method of claim 1, further comprising the step of:

repeating the input bit information in a predetermined period before the framing step.

3. The method of claim 1, wherein the input bit information is common key information for descrambling broadcasting data when demodulation is performed in a receiver.

4. The method of claim 3, wherein when a network for providing a free broadcasting service is a broadcasting network and a network for providing a pay broadcasting service is a relay network, the common key is transmitted only to the broadcasting network.

5. The method of claim 1, wherein 2^m-ary orthogonal signal point mapping is performed in the step of mapping the framed input bit information to the TII.

6. The method of claim 5, wherein when m is 5, the orthogonal set for the TII is selected within a range of 32 orthogonal sets obtained by selecting 2 main identifiers (IDs) and 16 sub IDs.

7. The method of claim 1, wherein the orthogonal set is selected within a range of 48 orthogonal sets obtained by selecting 2 main identifiers (IDs) and 24 sub IDs.

8. A transmission apparatus for transmitting information using a transmitter identification indicator (TII) in a digital broadcasting system, comprising:

a frame divider for framing input bit information in a predetermined bit unit;

an orthogonal signal point mapper for mapping the framed input bit information to the TII using a predefined orthogonal set; and

a modulator for modulating the TII to an Orthogonal Frequency Division Multiplexing (OFDM) symbol and transmitting the OFDM symbol.

9. The transmission apparatus of claim 8, further comprising:

a repeater for repeating the input bit information in a predetermined period and inputting the repeated input bit information to the frame divider.

10. The transmission apparatus of claim 8, wherein the input bit information is common key information for descrambling data when demodulation is performed in a receiver.

11. The transmission apparatus of claim 10, wherein when a network for providing a free broadcasting service is a broadcasting network and a network for providing a pay broadcasting service is a relay network, transmission apparatus transmits the common key only to the broadcasting network.

12. The transmission apparatus of claim 8, wherein the orthogonal signal point mapper performs 2^m-ary orthogonal signal point mapping.

13. The transmission apparatus of claim 11, wherein when m is 5, the orthogonal set for the TII is selected within a range of 32 orthogonal sets obtained by selecting 2 main identifiers (IDs) and 16 sub IDs.

14. The method of claim 8, wherein the orthogonal set is selected within a range of 48 orthogonal sets obtained by selecting 2 main identifiers (IDs) and 24 sub IDs.

15. A reception method for use in a digital broadcasting system for transmitting a Transmitter Identification Indicator (TII), comprising the steps of:

detecting a TII symbol from a predefined orthogonal signal set after demodulating an Orthogonal Frequency Division Multiplexing (OFDM) symbol;

demapping predetermined bits from the TII symbol; and

concatenating the demapped bits in a predetermined period unit and outputting bit information.

16. The reception method of claim 15, further comprising the step of:

demodulating received broadcasting data using the bit information when the bit information is common key information for descrambling data.

17. The reception method of claim 16, wherein when a network for providing a free broadcasting service is a broadcasting network and a network for providing a pay broadcasting service is a relay network, the TII is transmitted only in the broadcasting network.

18. A reception apparatus for use in a digital broadcasting system for transmitting a Transmitter Identification Indicator (TII), comprising:

an Orthogonal Frequency Division Multiplexing (OFDM) demodulator for demodulating a received OFDM symbol;

an orthogonal symbol detector for detecting a TII symbol from a predefined orthogonal signal set within the demodulated OFDM symbol;

a symbol-to-bit demapper for demapping predetermined bits from the TII symbol; and

a bit combiner for concatenating the demapped bits in a predetermined period unit and outputting bit information.

19. The reception apparatus of claim 18, further comprising:

descrambling means for demodulating received broadcasting data using the bit information when the bit information is common key information for descrambling the data.

20. The reception apparatus of claim 19, wherein when a network for providing a free broadcasting service is a broadcasting network and a network for providing a pay broadcasting service is a relay network, the TII is transmitted only in the:

broadcasting network.

21. A digital broadcasting system for transmitting information using a transmitter identification indicator (TII), comprising:

a transmitter for framing input bit information in a predetermined bit unit, mapping the framed input bit information to the TII using a predefined orthogonal set, modulating the TII to an Orthogonal Frequency Division Multiplexing (OFDM) symbol, and transmitting the OFDM symbol; and

a receiver for demodulating a received OFDM symbol, detecting a TII symbol from a predefined orthogonal signal set within the demodulated OFDM symbol, demapping predetermined bits from the TII symbol, concatenating the demapped bits in a predetermined period unit, and outputting bit information.

22. The digital broadcasting system of claim 21, wherein when a network for providing a pay broadcasting service is a broadcasting network and a network for providing a free broadcasting service is a relay network, the receiver descrambles received broadcasting data using the bit information included in the TII, the TII being transmitted only in the broadcasting network.

23. The digital broadcasting system of claim 21, wherein the orthogonal set is selected within a range of 48 orthogonal sets obtained by selecting 2 main identifiers (IDs) and 24 sub IDs.