Cross-Correlated TDMA, Spread Spectrum, CDMA and OFDM systems

• US 20080031310A1
• Filed: 10/11/2007
• Published: 02/07/2008
• Est. Priority Date: 08/10/1998
• Status: Active Grant

• Current Assignee: Kamilo Feher
• Original Assignee: Kamilo Feher
• Inventors: Feher, Kamilo
• Granted Patent: US 7,558,313 B2
• Time in Patent Office: Days
• US Class Current: 375/150
• CPC Class Codes: H04B 1/69 Spread spectrum techniques
• CPC Class Codes: H04B 1/707 using direct sequence modulation
• CPC Class Codes: H04B 2201/70703 using multiple or variable rates
• CPC Class Codes: H04B 7/0871 using different reception schemes, at least one of them being a diversity reception scheme
• CPC Class Codes: H04L 1/0056 Systems characterized by the type of code used H04L1/08 takes precedence
• CPC Class Codes: H04L 2025/03547 Switching between time domain structures
• CPC Class Codes: H04L 2025/03681 Control of adaptation
• CPC Class Codes: H04L 2027/0087 Out-of-band signals, (e.g. pilots)
• CPC Class Codes: H04L 25/03019 adaptive, i.e. capable of adjustment during data reception
• CPC Class Codes: H04L 25/03828 Arrangements for spectral shaping; Arrangements for providing signals with specified spectral properties partial response systems H04L25/497
• CPC Class Codes: H04L 25/4902 Pulse width modulation; Pulse position modulation
• CPC Class Codes: H04L 27/00 Modulated-carrier systems
• CPC Class Codes: H04L 27/0004 using wavelets
• 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 27/18 Phase-modulated carrier systems, i.e. using phase-shift keying H04L27/32 takes precedence
• CPC Class Codes: H04L 27/2017 in which the phase changes are non-linear, e.g. generalized and Gaussian minimum shift keying, tamed frequency modulation H04L27/201 takes precedence
• CPC Class Codes: H04L 27/2053 using more than one carrier, e.g. carriers with different phases
• CPC Class Codes: H04L 27/2071 in which the data are represented by the carrier phase, e.g. systems with differential coding
• CPC Class Codes: H04L 27/22 Demodulator circuits; Receiver circuits
• CPC Class Codes: H04L 27/2626 Arrangements specific to the transmitter only
• CPC Class Codes: H04L 27/2637 : with direct modulation of individual subcarriers
• CPC Class Codes: H04L 27/2647 : Arrangements specific to the receiver only equalisation H04L27/01
• CPC Class Codes: H04L 27/34 : Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
• CPC Class Codes: H04L 27/3405 : Modifications of the signal space to increase the efficiency of transmission, e.g. reduction of the bit error rate, bandwidth, or average power
• CPC Class Codes: H04L 27/362 : Modulation using more than one carrier, e.g. with quadrature carriers, separately amplitude modulated H04L27/366 takes precedence
• CPC Class Codes: H04L 27/38 : Demodulator circuits; Receiver circuits
• CPC Class Codes: H04L 7/0008 : Synchronisation information channels, e.g. clock distribution lines
• CPC Class Codes: Y02D 30/70 : in wireless communication networks

Abstract

Cross-Correlated Time Division Multiple Access (TDMA), Spread Spectrum, Code Division Multiple Access (CDMA) and Orthogonal Frequency Division Multiplexed (OFDM) modulated OFDM receiver and demodulator systems. Receiver for receiving a Time Division Multiple Access (TDMA) modulated signal having a first modulation format and a second modulated signal having a second modulation format and demodulator, filter and processor for demodulating, filtering and processing the received TDMA modulated signal and for filtered, processed cross-correlated in-phase and quadrature-phase baseband signals and demodulating the second modulated signal providing a demodulated baseband signal. A demodulator system containing two demodulators for demodulating the received signal. Receiver for receiving a Time Division Multiple Access (TDMA) and a Orthogonal Frequency Division Multiplexed (OFDM) modulated signal. A demodulator, filter and processor for demodulating, filtering and processing the received TDMA modulated signal and for providing demodulated filtered, processed TDMA cross-correlated in-phase and quadrature-phase baseband signals and demodulating the spread spectrum modulated signal and providing a demodulated filtered spread spectrum signal.

Claims

1. A receiver and demodulation system comprising:

a receiver for receiving a Time Division Multiple Access (TDMA) modulated signal having a first modulation format and a second modulated signal having a second modulation format, wherein first and second modulation formats have distinct modulation formats;

a demodulator, filter and processor for demodulating, filtering and processing the received TDMA modulated signal and for providing demodulated filtered, processed cross-correlated in-phase and quadrature-phase baseband signals and demodulating the second modulated signal providing a demodulated baseband signal; and

a selector for selecting either the first or the second or both demodulated baseband signals.

7. The system of claim 1 wherein said second modulated signal is a peak limited Orthogonal Frequency Division Multiplexed (OFDM) modulated signal.

8. The system of claim 1 wherein said second modulated signal is a cross-correlated spread spectrum modulated signal.

9. The system of claim 1 wherein said second modulated signal is a cross-correlated Code Division Multiple Access (CDMA) modulated signal.

10. The system of claim 1 wherein said receiver comprises Adaptive Antenna Arrays (AAA) for receiving modulated signal having first and second modulation format.

11. The system of claim 1 wherein said receiver comprises a diversity receiver for diversity reception.

12. The system of claim 1 wherein said receiver comprises a diversity receiver for diversity reception and said demodulator and processor comprises a pseudo-error and diversity control processor.

13. The system of claim 1 wherein said receiver for receiving comprises a Automatic Gain Control (AGC) circuitry operated in a non-linear (NL) mode.

2. A system comprising:

a receiver for receiving a Time Division Multiple Access (TDMA) modulated signal having a first modulation format and a second modulated signal having a second modulation format, wherein first and second modulation formats have distinct modulation formats; and

a demodulator system comprising a first and a second demodulator for demodulating the received signal, wherein the first demodulator comprises a demodulator, filter and processor for demodulating, filtering and processing the TDMA modulated signal and for providing demodulated, filtered cross-correlated in-phase and quadrature-phase baseband signals and the second demodulator comprises a demodulator, filter and processor for demodulating, filtering and processing the second modulated signal providing a demodulated baseband signal.

14. The system of claim 2 wherein said second modulated signal is a cross-correlated modulated spread spectrum signal.

15. The system of claim 2 wherein said second demodulator comprises a demodulator, filter and processor for demodulating, filtering and processing the second modulated signal and further comprises a cross-correlator processor for providing cross-correlated in-phase and quadrature phase signals.

16. The system of claim 2 wherein said receiver comprises two or more than two antennas for receiving modulated signals.

17. The system of claim 2 wherein said Time Division Multiple Access (TDMA) modulated signal comprises a Gaussian filtered modulated signal.

18. The system of claim 2 wherein said second modulated signal having a second modulation format is a Orthogonal Frequency Division Multiplexed (OFDM) modulated signal.

19. The system of claim 2 wherein said second modulated signal having a second modulation format is a cross-correlated spread spectrum modulated signal.

20. The system of claim 2 wherein said Time Division Multiple Access (TDMA) modulated signal is a cross-correlated TDMA baseband filtered modulated signal and said second modulated signal having a second modulation format is a cross-correlated spread spectrum baseband filtered modulated signal.

3. A receiver and demodulation system comprising:

a receiver for receiving a modulated signal having a first and a second modulation format modulated signal; and

a demodulator comprising a filter and a processor for demodulating, filtering and processing the received first and second modulated signal and for providing a first demodulated filtered, processed cross-correlated and a second demodulated filtered, processed cross-correlated in-phase and quadrature-phase baseband signal, wherein the first demodulated filtered cross-correlated signal is distinct from said second demodulated filtered cross-correlated signal.

21. The system of claim 3 wherein said receiver comprises Adaptive Antenna Arrays (AAA) for receiving modulated signal.

22. The system of claim 3 wherein said second modulated signal is a cross-correlated spread spectrum modulated signal.

23. The system of claim 3 wherein said second modulated signal is a Orthogonal Frequency Division Multiplexed (OFDM) modulated signal.

24. The system of claim 3 wherein said second demodulated filtered cross-correlated signal is a spread spectrum signal.

25. The system of claim 3 wherein said second demodulated filtered cross-correlated signal is a Code Division Multiple Access (CDMA) signal.

26. The system of claim 3 wherein said wherein said receiver comprises a diversity receiver for receiving modulated signal.

4. A receiver and demodulation system comprising:

a receiver for receiving a Time Division Multiple Access (TDMA) and a Orthogonal Frequency Division Multiplexed (OFDM) modulated signal; and

a demodulator, filter and processor for demodulating, filtering and processing the received TDMA modulated signal and for providing demodulated filtered, processed TDMA cross-correlated in-phase and quadrature-phase baseband signals and demodulating the OFDM modulated signal providing a demodulated OFDM signal.

27. The system of claim 4 wherein said receiver comprises two antennas for receiving modulated signal.

28. The system of claim 4 wherein said Time Division Multiple Access (TDMA) modulated signal comprises a Gaussian Minimum Shift Keyed (GMSK) modulated signal.

29. The system of claim 4 wherein said demodulator, filter and processor for demodulating, filtering and processing comprises two distinct demodulators.

5. A receiver and demodulation system comprising:

a receiver for receiving a Time Division Multiple Access (TDMA) and a spread spectrum modulated signal; and

a demodulator, filter and processor for demodulating, filtering and processing the received TDMA modulated signal and for providing demodulated filtered, processed TDMA cross-correlated in-phase and quadrature-phase baseband signals and demodulating the spread spectrum modulated signal and providing a demodulated filtered spread spectrum signal.

30. The system of claim 5 wherein said receiver comprises two antennas for receiving modulated signal.

31. The system of claim 5 wherein said demodulator, filter and processor for demodulating, filtering and processing the received spread spectrum signal comprises a cross-correlator processor for providing cross-correlated spread spectrum demodulated signal.

32. The system of claim 5 wherein said receiver for receiving comprises a Automatic Gain Control (AGC) circuitry operated in a non-linear (NL) mode.

6. A receiver and demodulation system comprising:

a receiver for receiving a first spread spectrum and a second spread spectrum modulated signal, wherein the modulation format of the first modulated signal is distinct from the modulation format of the second modulated signal; and

a demodulator, filter and processor for demodulating, filtering and processing the received first spread spectrum modulated signal and for providing demodulated filtered, processed spread spectrum cross-correlated in-phase and quadrature-phase baseband signals and demodulating the second spread spectrum modulated signal and providing a demodulated filtered spread spectrum signal.

34. The system of claim 6 wherein said receiver comprises two antennas for receiving modulated signal.

35. The system of claim 6 wherein said receiver comprises a diversity receiver for diversity reception and said demodulator and processor comprises a pseudo-error and diversity control processor.

36. The system of claim 6 wherein said receiver for receiving comprises a Automatic Gain Control (AGC) circuitry operated in a non-linear (NL) mode.

33. The system of clain 5 wherein said receiver comprises a diversity receiver for receiving modulated signal.