Emergency location transceivers (ELT)

• US 7,356,343 B2
• Filed: 04/25/2006
• Issued: 04/08/2008
• Est. Priority Date: 08/03/2005
• Status: Expired due to Fees

• Current Assignee: Kamilo Feher
• Original Assignee: Kamilo Feher
• Inventors: Feher, Kamilo
• Primary Examiner(s): Appiah, Charles N.
• Assistant Examiner(s): Ajayi, Joel
• Application Number:
  US11/410,492
• Publication Number:
  US 20070032220A1
• Time in Patent Office: 714 Days
• Field of Search: 370/206, 370/321, 370/337, 455/42, 455/130
• US Class Current: 455/456.1
• CPC Class Codes: H04L 27/0008 arrangements for allowing a transmitter or receiver to use more than one type of modulation negotiating modulation type for two-way transmission paths H04L5/1453
• CPC Class Codes: H04L 27/2601 Multicarrier modulation systems
• CPC Class Codes: H04M 11/04 with alarm systems, e.g. fire, police or burglar alarm systems
• CPC Class Codes: H04N 21/426 Internal components of the client ; Characteristics thereof H04N5/44 takes precedence
• CPC Class Codes: H04N 5/40 Modulation circuits
• CPC Class Codes: H04N 7/20 Adaptations for transmission via a GHz frequency band, e.g. via satellite
• CPC Class Codes: H04W 84/06 Airborne or Satellite Networks space-based or airborne stations H04B7/185

Abstract

Emergency Location Transceivers (ELT) and communication transceivers (transmitters and receivers) for reception and demodulation of location finder signals, Global Positioning System (GPS) satellite signals and non GPS satellite location finder and other location finder signals. The received location finder signals are demodulated to location finder baseband signals. Baseband signal processors for processing single or a plurality of input signals for providing Orthogonal Frequency Division Multiplex (OFDM) baseband signals, filtered signals, cross-correlated shaped in-phase and quadrature-phase baseband signals and spread spectrum signals. Signal modulators for modulating the processed signals and for providing the modulated signals to the signal transmitter for transmission of the modulated signals. Emergency receiver systems for reception, demodulation and processing of the modulated transmitted signals. Certain emergency receiver embodiments, such as receivers of calls made to emergency call number 911 contain two or more receive antennas for reception and processing of the transmitted modulated signal. In certain embodiments emergency receiver systems have two or more receive antennas operated in a diversity mode, for reception and processing of the transmitted modulated signal.

Claims

1. Emergency location communication system comprising:

a receiver and demodulator for reception and demodulation of location finder signals to demodulated location finder baseband signals;

a first baseband processor for receiving first bit rate input signals for generating processed Orthogonal Frequency Division Multiplex (OFDM) baseband signals;

a second baseband processor for receiving second bit rate input signals, wherein the second bit rate is different from the first bit rate, connecting said input signals to a cross-correlator and filter and providing processed baseband cross-correlated in-phase and quadrature-phase filtered signals;

a third baseband processor for processing signals comprising emergency communication connection or emergency signals or information or emergency phone numbers;

a fourth baseband processor for processing demodulated location finder baseband signals with the third processor processed signals and the processed second bit rate cross-correlated in-phase and quadrature-phase filtered baseband signals or with the first bit rate processed OFDM baseband signals;

a selector for selecting the processed baseband cross-correlated in-phase and quadrature-phase filtered baseband signals or the fourth processor processed signals and connecting the selected signals to a signal modulator; and

a signal modulator for modulating the selected signals and for providing the modulated signals to a signal transmitter for signal transmission.

4. The system of claim 1, wherein said location finder signals comprise signals received from at least one Global Positioning System (GPS) satellite location finder signal transmitter and at least one other, non GPS, location finder signal transmitter.

5. The system of claim 1, wherein said signal transmitter is operated in a linearly amplified mode for transmission of OFDM selected signals and it is operated in non-linearly amplified (NLA) mode for transmission of filtered selected signals.

6. The system of claim 1, wherein said signal transmitter comprises two or more transmit antennas.

7. The system of claim 1, wherein said emergency signals or emergency communication connection or emergency information or emergency phone numbers are 911.

8. The system of claim 1, wherein said Orthogonal Frequency Division Multiplex (OFDM) signals are cross-correlated filtered in-phase and quadrature-phase baseband signals.

9. The system of claim 1, wherein said location finder signals comprise signals received from three satellite Global Positioning System (GPS) signal transmitters.

2. An emergency location finder transceiver system comprising:

a receiver for reception of location finder signals;

a first processor for processing location finder signals;

a second processor for processing input signals and for providing Orthogonal Frequency Division Multiplex (OFDM) signals;

a third processor for receiving input signals and for providing spread spectrum signals;

a fourth processor and selector or combiner for selecting or combining and processing the first processor processed signals with OFDM signals or-with spread spectrum signals or with both OFDM signals and spread spectrum signals;

a control unit for control and selection of one of the fourth processor processed signals;

a selector for selecting and providing the fourth processor selected signal to a modulator;

a signal modulator for modulating the selected signal and for connecting the modulated signal to a signal transmitter for signal transmission; and

an emergency or alarm signal receiver for reception, demodulation and processing of the transmitted signal.

10. The system of claim 2, wherein said location finder signals comprise signals received from at least one Global Positioning System (GPS) satellite signal transmitter and at least one other, non GPS, signal transmitter.

11. The system of claim 2, wherein the said emergency or alarm signal receiver comprises two or more receive antennas for reception and processing of the transmitted modulated signal.

12. The system of claim 2, wherein said emergency or alarm signal receiver comprises two or more receive antennas operated in a diversity mode, for reception and processing of the transmitted modulated signal.

13. A system as in claim 2, wherein said spread spectrum signals comprise Code Division Multiple Access (CDMA) signals.

14. The system of claim 2, wherein said emergency or alarm signal receiver comprises a public safety answering point (PSAP) for reception and processing of emergency calls.

3. A location finder, communication system comprising:

a receiver for reception of location finder signals;

a first processor for processing location finder signals;

a second processor for processing an input signal and for providing processed Orthogonal Frequency Division Multiplex (OFDM) signals;

a third processor for processing an input signal and for providing processed cross-correlated shaped in-phase and quadrature-phase signals;

a fourth signal processor and selector for selecting and processing the first processor processed signals, with processed OFDM signals or with processed cross-correlated signals;

a modulator for modulating the fourth processor selected processed signals and for providing the modulated signal to a transmitter for signal transmission.

15. The system of claim 3, wherein said location finder signals comprise signals received from at least one Global Positioning System (GPS) satellite signal transmitter and at least one other, non GPS, signal transmitter.

16. The system of claim 3, wherein the said transmitter transmits signals to an emergency receiver system comprising two or more receive antennas for reception and processing of the transmitted modulated signal.

17. The system of claim 3, wherein said transmitter transmits signals to an emergency receiver system comprising two or more receive antennas operated in a diversity mode, for reception and processing of the transmitted modulated signal.

18. The system of claim 3, wherein said transmitter transmits signals to an emergency receiver system comprising a public safety answering point (PSAP) for reception and processing of emergency calls.

19. The system of claim 3, wherein said processed cross-correlated shaped in-phase and quadrature-phase signals are used in the Global Mobile System (GSM).

20. The system of claim 3, wherein said cross-correlated shaped in-phase and quadrature-phase signals are Gaussian shaped or Gaussian filtered signals.

21. A wireless system comprising:

a connector for providing from a wire, cable, or fiber optic communication connected internet system a first bit rate signal to a first Orthogonal Frequency Division Multiplex (OFDM) or of Orthogonal Frequency Division Multiple Access (OFDMA) to a first modulator and to a first wireless transmitter for modulating and transmitting said OFDM or OFDMA signal;

a first receiver and first demodulator for receiving and demodulating the transmitted OFDM or OFDMA signal to demodulated baseband OFDM or OFDMA signal;

a second receiver and second demodulator for receiving and demodulating location finder modulated transmitted signals to demodulated baseband location finder signal;

a first baseband processor for receiving and processing a second bit rate signal, wherein the bit rate of said second bit rate signal is different from the bit rate of said first bit rate signal, said first baseband processor comprising a signal generator for generating in-phase and a quadrature-phase signals, said in-phase and a quadrature-phase signals having the property when the in-phase signal has its maximum amplitude, the quadrature signal has zero value and when the in-phase signal has a local maximum the quadrature signal has a local minimum;

a second baseband processor for processing and combining demodulated baseband location finder signal with said second bit rate processed and generated in-phase and quadrature-phase signals and for providing second processor processed baseband signals to a second modulator and second transmitter for modulating and transmitting said combined baseband signals; and

a second modulator and second transmitter for modulating and transmitting said combined baseband signals.

22. The system of claim 21, wherein said in-phase and a quadrature-phase signals are cross-correlated in-phase and a quadrature-phase signals used in the Global Mobile System (GSM).

23. The system of claim 21, wherein said in-phase and a quadrature-phase signals comprise emergency signals or emergency phone numbers.

24. The system of claim 21, wherein said Orthogonal Frequency Division Multiplex (OFDM) or of Orthogonal Frequency Division Multiple Access (OFDMA) signal comprises OFDM or OFDMA cross-correlated in-phase and a quadrature-phase filtered signals.

25. The system of claim 21, wherein said second transmitter for modulating and transmitting said combined baseband signals comprises two or more radio frequency (RF) transmitters operated in two or more different RF bands.

26. A transmitter Multiple Input Multiple Output (MIMO) system comprising:

a first baseband processor for receiving and processing a first signal and for providing processed Orthogonal Frequency Division Multiplexed (OFDM) or Orthogonal Frequency Division Multiple Access (OFDMA) baseband signal;

a second baseband processor for receiving and processing a second signal, wherein said second signal is different from said first signal, and for providing a processed spread spectrum baseband signal;

a third baseband processor for receiving and processing said OFDM or OFDMA processed signal with a third signal containing location finder information or said spread spectrum processed signal with the third signal containing location finder information, wherein said third signal is different from said first and said second signal, and for providing the third baseband processor processed signal to a modulation system for modulation of the third baseband processor processed signal;

a modulation system comprising one or more modulators for modulation of the third baseband processor processed signal and for providing said modulated signal to a transmitter and antenna system for wireless transmission of the modulation system provided modulated signal;

a transmitter and antenna system comprising two or more than two signal transmitters for transmission of the modulation system provided modulated signal to two or more than two antennas for wireless signal transmission.

27. The system of claim 26, wherein said processed spread spectrum baseband signal is a processed cross-correlated in-phase and a quadrature-phase filtered baseband signal.

28. The system of claim 26, wherein said transmitter and antenna system comprising two or more than two signal transmitters for transmission of the modulation system provided modulated signal contains an emergency signal for signal transmission.

29. The system of claim 26, wherein said third signal containing location finder information signals is received from at least one Global Positioning System (GPS) satellite location finder signal transmitter and at least one other, non GPS, location finder signal transmitter.

30. The system of claim 26, wherein said processed spread spectrum baseband signal is a Collision Sense Multiple Access(CSMA) spread spectrum signal.

31. A receiver Multiple Input Multiple Output (MIMO) wireless system comprising:

a receiver system comprising four or more than four antennas and one or more than one receiver for receiving multiple modulated transmitted signals and providing the multiple received signals to one or more signal demodulators;

one or more than one demodulators for receiving, demodulating and processing the receiver system provided multiple received signals, wherein said received demodulator comprises circuitry for demodulation and processing of received Orthogonal Frequency Division Multiplexed (OFDM) or Orthogonal Frequency Division Multiple Access (OFDMA) signals and of received Time Division Multiple Access (TDMA) signals, wherein the OFDM or OFDMA received signal or the TDMA received signal contains location finder information signal and said OFDM or OFDMA received signal is different from said TDMA received signal;

a processor for processing and providing the demodulated OFDM or OFDMA signal to a first baseband output interface circuit and the demodulated TDMA signal to a second output interface circuit wherein said first output interface circuit is different than said second output interface circuit.

32. The system of claim 31, wherein said one or more than one demodulators for receiving, demodulating and processing Time Division Multiple Access (TDMA) signals provide in-phase and a quadrature-phase cross-correlated filtered baseband signals.

33. The system of claim 31, wherein said receiver system comprising four or more than four antennas and one or more than one receiver for receiving multiple signals receives signals containing emergency communication information signals.

34. The system of claim 31, wherein said processor for processing and providing the demodulated OFDM or OFDMA signal provides analog to digital (A/D) converted in-phase and quadrature-phase cross-correlated filtered baseband signals.

35. The system of claim 31, wherein said processor for processing and providing the demodulated TDMA signal comprises mis-matched post demodulation filter which is mis-matched to the filter used in filtering of said provided modulated transmitted TDMA signal.