Frequency modulated OFDM over various communication media

• US 11,152,971 B2
• Filed: 02/02/2004
• Issued: 10/19/2021
• Est. Priority Date: 02/02/2004
• Status: Active Grant

• Current Assignee: Satius Holding, Inc. (Satius, Inc.)
• Original Assignee: Satius Holding, Inc. (Satius, Inc.)
• Inventors: Abraham, Charles, Yan, Hongbo, Fisch, James, Jarels, John, Sutton, Alexander M.
• Primary Examiner(s): Wong, Linda
• Application Number:
  US10/770,342
• Publication Number:
  US 20050169401A1
• Time in Patent Office: 6,469 Days
• Field of Search: 375329, 375299, 375144, 375260, 375148, 370235, 370319, 370343, 370344, 370347, 370378, 370483, 307104, 455 4243, 455 23, 455 17, 455205, 455207
• CPC Class Codes: H04B 2203/5416 by adding signals to the wave form of the power source
• CPC Class Codes: H04B 2203/5445 Local network
• CPC Class Codes: H04B 2203/545 Audio/video application, e.g. interphone
• CPC Class Codes: H04B 3/54 Systems for transmission via power distribution lines
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/0009 by adapting the channel coding H04L1/1812 takes precedence
• CPC Class Codes: H04L 27/2627 Modulators
• CPC Class Codes: H04L 27/2649 Demodulators

Abstract

The present invention provides an FM Orthogonal Frequency Division Multiplexing (OFDM) modulation process that enable high-speed data communications over any transmission media and networks. The process is implemented with a modem device modulator and demodulator that provides communication with several other modem devices along any communication media that uses an FM OFDM modulation technique, a physical transmission medium such as power lines, or wireless (air), or cable, or twisted pairs communication media.

Claims

1. An apparatus constructed to transmit a communication signal over a transmission medium, said apparatus comprising:

a plurality of digital signal processing units constructed to process an incoming baseband signal and output a frequency division multiplexed (FDM) output signal defining a modulated OFDM system, wherein the baseband signal is a digitally modulated with a digital modulation technique adaptively selected based on a retrieved transmission medium quality feedback;

at least one digital to analog converter (DAC) operable to convert said FDM output signal to at least one analog FDM signal; and

a first frequency modulation (FM) modulator coupled to said at least one DAC, said first FM modulator disposed in serial relation with said modulated OFDM system, said first FM modulator receiving said analog FDM signal of said DAC and outputting a frequency modulated (FM)-FDM signal to the transmission medium, said frequency modulated FM-OFDM signal undergoing FM modulation.

2. The apparatus of claim 1, further including a second FM modulator, said second FM modulator being disposed in parallel relation to said first FM modulator wherein the FDM output signal of the digital signal processing units includes an in-phase signal and a quadrature signal, the in-phase signal being provided to the first FM modulator and the quadrature signal being provided to the second FM modulator, the first and the second FM modulators each outputting a frequency modulated FM-OFDM output signal to the transmission medium.

13. The apparatus as recited in claim 1, wherein said FDM signal is an Orthogonal Frequency Division Multiplex signal.

3. An apparatus for receiving a communication signal from a transmission medium, said apparatus comprising:

a plurality of digital signal processing units being adapted to process a frequency division multiplexing (FDM) communication signal and output a baseband signal defining demodulated OFDM system;

at least one analog one digital converter (ADC) operatively coupled to said demodulated OFDM system; and

a first frequency modulation (FM) demodulator disposed in serial relation to said demodulated OFDM system, said first FM demodulator receiving an analog frequency modulated (FM)-FDM communication signal from a transmission medium coupled thereto and demodulating said FM-FDM signal to output an analog FDM communication signal to said ADC, said analog FDM signal demodulated to have an instantaneous amplitude response to an instantaneous frequency of said FM-FDM communication signal, said FM-FDM communication signal undergoing FM demodulation;

said demodulated OFDM system being operatively coupled to an output of the first FM demodulator via said ADC, said demodulated OFDM system digitally demodulating said FDM signal with a digital modulation technique adaptively selected based on a retrieved transmission medium quality feedback.

4. The apparatus of claim 3, wherein an output of the transmission medium includes an in-phase signal and a quadrature signal, the in-phase signal being provided to the first FM demodulator and the quadrature signal being provided to a second FM demodulator, said second FM demodulator being disposed in parallel relation to said first FM demodulator and the first and the second FM demodulators each outputting a frequency demodulated FDM signal to the demodulated OFDM system.

14. The apparatus as recited in claim 3, wherein said FDM signal is an Orthogonal Frequency Division Multiplex signal.

5. An apparatus for transmitting a communication signal over a transmission medium, said apparatus comprising:

a plurality of digital signal processing units adapted to process an incoming baseband signal and output a frequency division multiplex (FDM) output signal defining a modulated OFDM system, wherein the baseband signal is digitally modulated with a digital modulation technique adaptively selected based on a retrieved transmission medium quality feedback;

at least one digital to analog converter (DAC) coupled to said modulated OFDM system and operable to convert said FDM output signal to at least one analog FDM signal; and

a first frequency modulation (FM) modulator disposed in serial relation to said modulated OFDM system and coupled to said at least one DAC, said first FM modulator receiving said analog FDM signal of said DAC and outputting a frequency modulated (FM)-FDM signal to the transmission medium, wherein said FM-FDM signal undergoes FM modulation.

6. The apparatus of claim 5, further including a second FM modulator wherein said analog FDM signal of said DAC includes an in-phase signal and a quadrature signal, the in-phase signal being provided to the first FM modulator and the quadrature signal being provided to the second FM modulator, the first and the second FM modulators each outputting a frequency modulated FM-FDM output signal to the transmission medium.

15. The apparatus as recited in claim 5, wherein said FDM signal is an Orthogonal Frequency Division Multiplex signal.

7. An apparatus for receiving a communication signal from a transmission medium, said apparatus comprising:

a plurality of digital signal processing units being adapted to process a frequency division multiplex (FDM) communication signal and output a baseband signal defining a demodulated OFDM system;

at least one analog to digital converter (ADC) operatively coupled to said demodulated OFDM system; and

a first frequency modulation (FM) demodulator, said first FM demodulator receiving an analog frequency modulated (FM)-FDM communication signal from said transmission medium coupled thereto and outputting a frequency demodulated analog FDM signal to said ADC;

said demodulated OFDM system being operatively coupled to an output of said first FM demodulator, said first FM demodulator being adapted to receive an FM-FDM signal from the transmission medium and output said frequency demodulated analog FDM signal, wherein said FM-FDM signal undergoes FM modulation, wherein said demodulated OFDM system digitally demodulates said FDM signal with a digital modulation technique adaptively selected based on a retrieved transmission medium quality feedback.

8. The apparatus of claim 7, wherein an output of the transmission medium includes an in-phase signal and a quadrature signal, the in-phase signal being provided to the first FM demodulator and the quadrature signal being provided to a second FM demodulator, the first and the second FM demodulators each outputting a frequency demodulated FDM signal to the demodulated OFDM system.

16. The apparatus as recited in claim 7, wherein said FDM signal is an Orthogonal Frequency Division Multiplex signal.

9. An apparatus for transmitting a communication signal over a transmission medium, said apparatus comprising:

a plurality of digital signal processing units adapted to process an incoming baseband signal and output a frequency division multiplex (FDM) output signal defining a modulated OFDM system, wherein the baseband signal is digitally modulated with a digital modulation technique adaptively selected based on a retrieved transmission medium quality feedback;

at least one digital to analog converter (DAC) operable to convert said FDM output signal to at least one analog FDM signal; and

a first frequency modulation (FM) modulator disposed in serial relation to said modulated OFDM system and coupled to said at least one DAC, said first FM modulator receiving said analog FDM signal of said DAC and outputting a frequency modulated (FM)-FDM signal to the transmission medium, wherein said frequency division multiplex (FDM) signal is a phase shift keying or an amplitude modulated signal, said frequency modulated FM-FDM signal undergoing FM modulation.

10. The apparatus of claim 9, further including a second FM modulator wherein the analog FDM output signal of the modulated OFDM system includes an in-phase signal and a quadrature signal, the in-phase signal being provided to the first FM modulator and the quadrature signal being provided to the second FM modulator, the first and the second FM modulators each outputting a frequency modulated FM-FDM output signal to the transmission medium.

17. The apparatus as recited in claim 9, wherein said FDM signal is an Orthogonal Frequency Division Multiplex signal.

11. An apparatus for receiving a communication signal from a transmission medium, said apparatus comprising:

a plurality of digital signal processing units being adapted to process a frequency division multiplex (FDM) communication signal and output a baseband signal defining a demodulated OFDM system;

at least one analog to digital converter (ADC) operatively coupled to said demodulated OFDM system; and

a first frequency modulation (FM) demodulator disposed in serial relation with said demodulated OFDM system, said first FM demodulator receiving an analog frequency modulated (FM)-FDM communication signal from said transmission medium coupled thereto and outputting an analog FDM communication signal to said ADC, said analog FDM signal demodulated by said FM demodulator;

said demodulated OFDM system being operatively coupled to an output of the first FM demodulator wherein said frequency division multiplex (FDM) communication signal is phase shift keying or an amplitude modulated signal, said demodulated OFDM system digitally demodulates said FDM signal with a digital modulation technique adaptively selected based on a retrieved transmission medium quality feedback.

12. The apparatus of claim 11, wherein an output of the transmission medium includes an in-phase signal and a quadrature signal, the in-phase signal being provided to the first FM demodulator and the quadrature signal being provided to a second FM demodulator, the first and the second FM demodulators each outputting a frequency demodulated FDM signal to the first frequency demodulators.

18. The apparatus as recited in claim 11, wherein said FDM signal is an Orthogonal Frequency Division Multiplex signal.

19. An apparatus for transmitting a communication signal over a transmission medium, said apparatus comprising:

digital signal processing units adapted to processing an incoming baseband signal, wherein the baseband signal is digitally modulated with a digital modulation technique selected based on a retrieved transmission medium quality feedback, and outputting either a frequency division multiplexed (FDM) output signal or an orthogonal frequency division multiplex (OFDM) output signal; and

further comprising

a first frequency modulation modulator, said first frequency modulation modulator receiving the FDM output signal or the orthogonal frequency division multiplex (OFDM) output signal as the output signal of said digital signal processing units and outputting a frequency modulated signal to the transmission medium.

20. The apparatus od claim 19, further including a second frequency modulation modulator wherein the output signal of the digital signal processing units consists of an in-phase signal and a quadrature signal, the in-phase signal being provided to the first frequency modulation modulator and the quadrature signal being provided to the second frequency modulation modulator, the first and second frequency modulation modulators each outputting a frequency modulated output signal to the transmission medium.

21. An apparatus for receiving a communication signal from a transmission medium, said apparatus comprising:

digital signal processing units adapted to processing either an orthogonal frequency division multiplex (OFDM) communication signal or a frequency division multiplex (FDM) communication signal, wherein the communication signal is digitally demodulated with a digital modulation technique selected based on a retrieved transmission medium quality feedback, and outputting a baseband signal; and

further comprising

a first frequency demodulator, said digital signal processing units being operatively connected to an output of the first frequency demodulator, said first frequency demodulator being adapted to receive an output from the transmission medium and outputting a frequency demodulated frequency division multiplex (FDM) signal or an orthogonal frequency division multiplex (OFDM) signal.

22. The apparatus as recited in claim 21, wherein the output of the transmission medium consists of an in-phase signal and a quadrature signal, the in-phase signal being provided to the first frequency demodulator and the quadrature signal being provided to a second frequency demodulator, the first and the second frequency demodulators each outputting a frequency demodulated signal to the digital signal processing units.

23. An apparatus comprising:

an Orthogonal Frequency Division Multiplexing (OFDM) Modulator that retrieves forward channel quality feedback from a receiver and selects a code to encode a bit stream, interleaves encoded bits to break error bursts into scattered individual errors across a transmission, the transmission comprising information from the bit stream, modulates the transmission, inserts pilot symbols, modulates specific carriers via Inverse Fast Fourier Transform, and outputs the transmission;

a first frequency modulator, the OFDM Modulator operatively connected the first frequency modulator, the first frequency modulator constructed to frequency modulate the transmission that is outputted from the OFDM Modulator.

24. The apparatus of claim 23, further comprising:

a second frequency modulator, the OFDM Modulator operatively connected the second frequency modulator, wherein the first frequency modulator and the second frequency modulator each creating a separate frequency band for in-phase components of the transmission and quadrature components of the transmission.