Method and system to increase available bandwidth in a time division multiplexing system

• US 20060276125A1
• Filed: 05/19/2005
• Published: 12/07/2006
• Est. Priority Date: 05/19/2005
• Status: Active Grant

• Current Assignee: Aptiv Technologies AG (Aptiv PLC)
• Original Assignee: Delphi Technologies, Inc. (BorgWarner Incorporated)
• Inventors: Dibiaso, Eric A., Walker, Glenn A., Bolduc, Timothy D.
• Granted Patent: US 7,697,886 B2
• Time in Patent Office: Days
• US Class Current: 455/3.20
• CPC Class Codes: H03M 13/31 combining coding for error detection or correction and efficient use of the spectrum without error detection or correction H03M5/14 , H03M5/145
• CPC Class Codes: H04B 7/18523 Satellite systems for providing broadcast service to terrestrial stations, i.e. broadcast satellite service arrangements specially adapted for satellite broadcast receiving H04H40/90; picture transmission via satellite H04N1/00103; television transmission via satellite H04N7/20
• CPC Class Codes: H04H 20/28 Arrangements for simultaneous broadcast of plural pieces of information
• CPC Class Codes: H04H 20/74 of satellite networks
• CPC Class Codes: H04H 40/90 specially adapted for satellite broadcast receiving

Abstract

The present invention involves a method for transmitting data within a specified band of allocated spectrum in a satellite digital transmission system. First a data stream is encoded according to a first encoding scheme, then a second data stream is generated according to a second encoding scheme. The second encoding scheme is incompatible with the first encoding scheme. The first and second data streams are transmitted at predetermined locations within the specified band, such as time slices within a time division multiplexing transmission system. The second data stream is generated by using a more efficient FEC algorithm, including turbo-convolutional, turbo-product, low density parity check, or repeat-accumulate encoders. The inventive receiver has an antenna for receiving RF signals and a demodulator coupled to the antenna for downconverting received RF signals into a data stream. A splitter then separates the data stream into first and second component data streams. A first detector is coupled to the splitter, and is adapted to detect data in the first format. A second detector is coupled to the splitter, and is adapted to detect data in the second format.

Claims

1. A method for transmitting data within a specified band in a satellite digital transmission system comprising the steps of:

generating a first data stream according to a first encoding scheme;

generating a second data stream according to a second encoding scheme, the second encoding scheme being incompatible with the first encoding scheme; and

transmitting the first data stream and the second data stream at predetermined locations within the specified band.

2. The method of claim 1 wherein the second data stream generating step includes using an encoder which is more efficient than the encoder used in the first data stream generating step.

3. The method of claim 2 wherein the second data stream generating step includes using one of a turbo-convolutional, turbo-product, low density parity check, and repeat-accumulate encoders.

4. The method of claim 1 wherein the transmitting step includes allocating the first data stream time slices of a time division multiplexing transmission to a portion of the specified band.

5. The method of claim 4 wherein the transmitting step includes allocating the second data stream time slices of a time division multiplexing transmission that are not allocated to the first data stream.

6. The method of claim 1 further including the step of interleaving the first and second data streams.

7. The method of claim 6 further including the step of receiving the transmitted first and second data streams.

8. The method of claim 7 wherein the receiving step includes de-interleaving the first and second data streams.

9. The method of claim 7 further including the steps of demodulating the first and second data streams, performing orthogonal frequency division multiplexing (OFDM) modulation, and transmitting an OFDM signal including the first and second data streams.

10. A receiver for receiving data within a specified band in a satellite digital transmission system, the data being transmitted in first and second formats having incompatible formats comprising:

an antenna for receiving RF signals;

a demodulator coupled to said antenna for downconverting received RF signals into a data stream;

a splitter for separating the data stream into first and second component data streams;

a first detector coupled to said splitter, said first detector having a first output, and said first detector being adapted to detect data in the first format and provide data on said first output; and

a second detector coupled to said splitter, said second detector having a second output, and said second detector being adapted to detect data in the second format and provide data on said second output.

11. The receiver of claim 10 wherein said antenna is adapted to receive satellite broadcast signals.

12. The receiver of claim 10 wherein said second detector is configured to perform a decoding algorithm which is more efficient than the decoding algorithm used in the first detector.

13. The receiver of claim 10 wherein said second detector is configured to perform one of a turbo-convolutional, turbo-product, low density parity check, and repeat-accumulate decoding algorithm.

14. The receiver of claim 10 wherein said demodulator is adapted to demodulate time division multiplexing transmissions.

15. The receiver of claim 10 wherein said splitter includes a de-interleaver.

16. The receiver of claim 10 wherein said splitter includes a de-mapper.

17. The receiver of claim 10 wherein said demodulator is capable of demodulating an orthogonal frequency division multiplexing (OFDM) signal.

18. The receiver of claim 17 further comprising a second antenna adapted to receive OFDM signals.

19. A transmitter for transmitting satellite digital audio radio signals comprising:

a first encoder configured to encode a first data stream into a first format;

a second encoder configured to encode a second data stream into a second format which is incompatible with the first format;

a modulator coupled to said first and second encoders, said modulator configured to provide a modulated output representing the first and second data streams; and

a transmitter coupled to said modulator configured to transmit said modulated output.

20. The transmitter of claim 19 wherein said second encoder includes an encoder which is more efficient than said first encoder.

21. The transmitter of claim 19 wherein said second encoder includes one of a turbo-convolutional, turbo-product, low density parity check, and repeat-accumulate encoders.

22. The transmitter of claim 19 wherein said modulator includes a mapper.

23. The transmitter of claim 22 wherein said modulator further includes an interleaver.

24. The transmitter of claim 19 wherein said modulator is configured for a time division multiplexing transmission system.