Apparatus, systems, methods and computer program products for producing a single frequency network for ATSC mobile / handheld services

• US 8,355,458 B2
• Filed: 06/25/2009
• Issued: 01/15/2013
• Est. Priority Date: 06/25/2008
• Status: Active Grant

• Current Assignee: Rohde & Schwarz GmbH & Company KG
• Original Assignee: Rohde & Schwarz GmbH & Company KG
• Inventors: Simon, Michael, Kramer, Michael
• Primary Examiner(s): Ometz, David
• Assistant Examiner(s): Garcia, Santiago
• Application Number:
  US12/491,305
• Publication Number:
  US 20090323729A1
• Time in Patent Office: 1,300 Days
• Field of Search: 375/260
• US Class Current: 375/265
• CPC Class Codes: H04H 20/67 Common-wave systems, i.e. using separate transmitters operating on substantially the same frequency
• CPC Class Codes: H04L 1/0057 Block codes H04L1/0061, H04L1/0064 take precedence
• CPC Class Codes: H04L 1/006 Trellis-coded modulation
• CPC Class Codes: H04L 1/0065 Serial concatenated codes
• CPC Class Codes: H04L 1/007 Unequal error protection for format H04L1/0078; for codes per se H03M13/35
• CPC Class Codes: H04L 1/0071 Use of interleaving interleaving per se H03M13/27

Abstract

Producing coherent symbols from a plurality of digital RF transmitters is achieved by selecting data bytes corresponding to mobile-handheld encapsulation (MHE) packets and setting trellis coders to a predetermined state when a predetermined number of bits of the data bytes enter a corresponding trellis coder.

Claims

1. A method for producing a plurality of coherent symbols from a plurality of digital RF transmitters, each of the plurality of digital RF transmitters having a plurality of trellis coders, the method comprising the steps of:

selecting, by a processor, in accordance with a predetermined mapping, a plurality of data bytes corresponding to at least one of a plurality of mobile-handheld (MH) encapsulation (MHE) packets of an MHE slot, wherein the MHE slot contains at least one of (i) data for MH receivers and (ii) normal data for stationary receivers, and wherein each of the plurality of data bytes correspond to a respective one the plurality of trellis coders;

providing each of the plurality of data bytes to the plurality of trellis coders, correspondingly; and

setting each one of the plurality of trellis coders to a predetermined state when a predetermined number of bits of the corresponding one of the plurality of data bytes enter the corresponding trellis coder, thereby causing the plurality of digital RF transmitters to transmit a plurality of symbols coherently.

2. The method according to claim 1, wherein the predetermined state of each corresponding trellis coder is coincident with the arrival of the predetermined number of bits over a predetermined number of symbol clock cycles.

3. The method according to claim 2, wherein the predetermined number of bits is 4 and the predetermined number of symbol clock cycles is 2.

4. The method according to claim 1, wherein the predetermined mapping is a mapping of a data interleaver, and wherein the method further comprising comprises:

selecting each of the plurality of data bytes from a packet/byte pair identified in accordance with the mapping of the data interleaver.

5. The method according to claim 4, wherein the mapping identifies a time dispersion of positions of the data bytes before and after the data interleaver.

6. The method according to claim 1, wherein the plurality of data bytes located within the MHE packets are non-systematic Reed-Solomon (RS) parity bytes.

7. An apparatus for producing a plurality of coherent symbols, comprising:

a processor operable to;

select, in accordance with a predetermined mapping, a plurality of data bytes corresponding to at least one of a plurality of mobile-handheld (MH) encapsulation (MHE) packets of an MHE slot, wherein the MHE slot contains at least one of (i) data for MH receivers and (ii) normal data for stationary receivers, and wherein each of the plurality of data bytes corresponds to a respective one a plurality of trellis coders, and

provide each of the plurality of data bytes to the plurality of trellis coders, correspondingly;

to set each one of the plurality of trellis coders to a predetermined state when a predetermined number of bits of the corresponding one of the plurality of data bytes enter the corresponding trellis coder, thereby causing a plurality of digital RF transmitters to transmit a plurality of symbols coherently.

8. The apparatus according to claim 7, wherein the predetermined state of each corresponding trellis coder is coincident with the arrival of the predetermined number of bits over a predetermined number of symbol clock cycles.

9. The apparatus according to claim 8, wherein the predetermined number of bits is 4 and the predetermined number of symbol clock cycles is 2.

10. The apparatus according to claim 7, wherein the predetermined mapping is a mapping of a data interleaver, and wherein the apparatus further comprises:

a memory operable to store locations of the bytes to obtain by said selecting, based on a packet/byte pair identified in accordance with the mapping of the data interleaver.

11. The apparatus according to claim 10, wherein the mapping identifies a time dispersion of positions of the data bytes before and after the data interleaver.

12. The apparatus according to claim 7, wherein the plurality of data bytes located within the MHE packets are non-systematic Reed-Solomon (RS) parity bytes.

13. A non-transitory computer-readable medium having stored thereon sequences of instructions, the sequences of instructions including instructions which, when executed by a computer system, cause the computer system to perform:

selecting, in accordance with a predetermined mapping, a plurality of data bytes corresponding to at least one of a plurality of mobile-handheld (MH) encapsulation (MHE) packets of an MHE slot, wherein the MHE slot contains at least one of (i) data for MH receivers and (ii) normal data for stationary receivers, and wherein each of the plurality of data bytes corresponds to a respective one the plurality of trellis coders;

providing each of the plurality of data bytes to the plurality of trellis coders, correspondingly; and

setting each one of a plurality of trellis coders to a predetermined state when a predetermined number of bits of the corresponding one of the plurality of data bytes enter the corresponding trellis coder, thereby causing a plurality of digital RF transmitters to transmit a plurality of symbols coherently.

14. The non-transitory computer-readable medium according to claim 13, wherein the predetermined state of each corresponding trellis coder is coincident with the arrival of the predetermined number of bits over a predetermined number of symbol clock cycles.

15. The non-transitory computer-readable medium according to claim 14, wherein the predetermined number of bits is 4 and the predetermined number of symbol clock cycles is 2.

16. The non-transitory computer-readable medium of claim 13, wherein the predetermined mapping is a mapping of a data interleaver, and wherein the computer-readable medium further has stored thereon a sequence of instructions which, when executed by the computer system, cause the computer system to perform:

selecting each of the plurality of data bytes from a packet/byte pair identified in accordance with the mapping of the data interleaver.

17. The non-transitory computer-readable medium according to claim 16, wherein the mapping identifies a time dispersion of positions of the data bytes before and after the data interleaver.

18. The non-transitory computer-readable medium according to claim 16, wherein the plurality of data bytes located within the MHE packets are non-systematic Reed-Solomon (RS) parity bytes.