Method to inject hierarchical data onto single carrier stream

• US 20050111581A1
• Filed: 09/22/2004
• Published: 05/26/2005
• Est. Priority Date: 11/26/2003
• Status: Active Grant

• Current Assignee: Aptiv Technologies AG
• Original Assignee: Delphi Technologies, Inc. (BorgWarner Incorporated)
• Inventors: Dibiaso, Eric A., Walker, Glenn A., Hiatt, Michael L. Jr.
• Granted Patent: US 7,280,613 B2
• Time in Patent Office: Days
• US Class Current: 375/308
• CPC Class Codes: H04B 7/18513 Transmission in a satellite or space-based system
• CPC Class Codes: H04L 27/183 Multiresolution systems
• CPC Class Codes: H04L 27/3488 Multiresolution systems

Abstract

The present invention involves a transmitter for transmitting two levels of data in a hierarchical transmission system. The transmitter has encoders, a modulator, an adjuster, and an up converter. The first encoder has a first output and capable of providing digital information based on a first level of data on the first output. The second encoder has a second output and is capable of providing digital information based on a second level of data on the second output. The modulator is coupled to the first encoder and has I and Q outputs. The adjuster is coupled to the modulator and second encoder and modifies signals on the I and Q outputs of the modulator to produce transmission I and transmission Q outputs. The up converter is coupled to the adjuster and is capable of transmitting broadcast radio signals based on the transmission I and transmission Q outputs. The modulator may include a root raised cosine filter and/or a QPSK modulator. The I and Q outputs of the modulator include analog I and analog Q signals. The adjuster includes an inverter, a phase rotator circuit, a combiner, and/or a limiter. The transmission I and transmission Q outputs of the adjuster include analog I and analog Q signals.

Claims

1. A transmitter for transmitting two levels of data in a hierarchical transmission system comprising:

a first encoder having a first output and capable of providing digital information based on a first level of data on said first output;

a second encoder having a second output and capable of providing digital information based on a second level of data on said second output;

a modulator coupled to said first encoder and having I and Q outputs;

an adjuster coupled to said modulator and second encoder and modifying signals on said I and Q outputs of said modulator, said adjuster having transmission I and transmission Q outputs; and

an up converter coupled to said adjuster and capable of transmitting broadcast radio signals based on said transmission I and transmission Q outputs.

2. The transmitter of claim 1 wherein said modulator includes a root raised cosine filter.

3. The transmitter of claim 1 wherein said modulator includes a QPSK modulator.

4. The transmitter of claim 1 wherein said I and Q outputs of said modulator include analog I and analog Q signals.

5. The transmitter of claim 1 wherein said adjuster includes an inverter.

6. The transmitter of claim 1 wherein said adjuster includes a phase rotator circuit.

7. The transmitter of claim 1 wherein said adjuster includes a root raised cosine filter coupled to at least one of said first and second outputs.

8. The transmitter of claim 1 further comprising a limiter coupling said I and Q outputs of said modulator to said adjuster.

9. The transmitter of claim 1 wherein said transmission I and transmission Q outputs of said adjuster include analog I and analog Q signals.

10. A method for transmitting two levels of data in a hierarchical transmission system comprising the steps of:

generating a first modulated signal having I and Q components based on first input data;

introducing a second modulation in the I and Q components of the first modulated signal based on second input data, said second modulation being separately performed on the I and Q components of the first modulated signal to generate a modified signal;

transmitting the modified signal;

detecting the modified signal by performing a first demodulation of the first modulated signal then a second demodulation to obtain the first input data and the second input data.

11. The method of claim 10 wherein said generating step involves using a root raised cosine filter.

12. The method of claim 11 wherein said generating step is performed before said introducing step.

13. The method of claim 10 wherein said generating step involves using a QPSK modulator.

14. The method of claim 10 wherein said generating step produces analog I and analog Q signals.

15. The method of claim 10 wherein said introducing step produces analog I and analog Q transmission signals.

16. An integrated circuit chip for enabling the use of hierarchical modulation data in a SDAR system, said integrated circuit chip comprising:

data generating means for providing a first and a second bit stream;

a first encoder in electrical communication with said data generating means, said first encoder receiving said first bit stream and encoding said first bit stream into a first transmit signal;

a second encoder in electrical communication with said data generating means, said second encoder receiving said second bit stream and encoding said second bit stream into a second transmit signal;

a modulator in electrical communication with said first and second encoders, said modulator utilizing a PSK modulating scheme to modulate said first transmit signal with said second transmit signal on a carrier wave to produce a modulated transmit signal, said transmit signal comprising an I-signal and a Q-signal;

an adjusting means for adjusting the I and Q signal so as to adjust the phase of said transmit signal, said adjusting means in electrical communication with said modulator; and

up-converting means for up-converting said transmit signal to RF, said up-converting means in electrical communication with said adjusting means.

17. The integrated circuit chip of claim 16 further comprising uplinking means for transmitting said RF transmit signal to at least two communication satellites.

18. The integrated circuit chip of claim 17 wherein said uplinking means is adapted to transmit said RF transmit signal such that said communication satellites receiving said RF transmit signal are capable of re-transmitting said RF transmit signal to at least one of a receiver and a terrestrial repeater.

19. The integrated circuit chip of claim 18 wherein said uplinking means is adapted to provide said RF transmits signal to a receiver which comprises:

at least one antenna for receiving said RF transmit signal;

a tuner unit for tuning said transmit signal received by said at least one antenna;

at least one demodulator coupled to said tuner unit and configured to demodulate said received signal; and

a microprocessor coupled to said at least one demodulator and adapted to interpret at least one of said first and said second bit streams into digital information to be provided to an output unit.

20. The integrated circuit chip of claim 16 wherein said modulator is adapted to utilize a QPSK modulating scheme.