QAM and GMSK systems

• US 8,050,345 B1
• Filed: 11/08/2007
• Issued: 11/01/2011
• Est. Priority Date: 08/09/1999
• Status: Expired due to Fees

• Current Assignee: Kamilo Feher
• Original Assignee: Kamilo Feher
• Inventors: Feher, Kamilo
• Primary Examiner(s): Wang, Ted M
• Application Number:
  US11/937,467
• Publication Number:
  US 20110274194A1
• Time in Patent Office: 1,454 Days
• Field of Search: 375/260, 375/295, 375/261, 375/297, 375/267, 375/299
• US Class Current: 375/261
• CPC Class Codes: H04B 1/707 using direct sequence modulation
• CPC Class Codes: H04B 2201/70703 using multiple or variable rates
• CPC Class Codes: H04L 25/4902 Pulse width modulation; Pulse position modulation
• 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 27/2017 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 27/2637 with direct modulation of individual subcarriers
• CPC Class Codes: H04L 27/34 Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 7/0008 Synchronisation information channels, e.g. clock distribution lines

Abstract

Transmit baseband filter and modulator for filtering and modulating a first bit rate signal into a Gaussian filtered modulated signal and a second transmit filter and modulator for filtering and modulating a second bit rate signal into a Quadrature Amplitude Modulated (QAM) signal. A first amplifier and first transmitter for nonlinearly amplifying and a second amplifier and second transmitter for linearly amplifying modulated signals. A diversity receiver and demodulator system for receiving and demodulating transmitted modulated signals. Processor, transmit baseband filter and modulator provides cross-correlated in-phase and quadrature-phase Gaussian filtered Gaussian Minimum Shift Keying (GMSK) modulated signal, spread spectrum Quadrature Phase Shift Keying (QPSK) modulated signal. Transmit processor and filter provides time division multiplexed (TDM) Gaussian filtered baseband signal and Orthogonal Frequency Division Multiplexed (OFDM) in-phase and quadrature-phase baseband modulated signal to a cellular network and to separate wireless network. Diversity receiver and demodulator provides demodulated cross-correlated in-phase and quadrature-phase filtered signal, with receive filter mis-matched to transmit filter.

Claims

1. A system comprising:

a first transmit baseband filter and modulator for filtering and modulating a first bit rate signal into a Gaussian filtered modulated signal;

a second transmit filter and modulator for filtering and modulating a second bit rate signal into a Quadrature Amplitude Modulated (QAM) signal, wherein second bit rate is different from first bit rate;

a first amplifier and first transmitter for nonlinearly amplifying and for providing amplified signal to a first transmitter for transmission of the nonlinearly amplified Gaussian filtered modulated signal;

a second amplifier and second transmitter for linearly amplifying and for providing amplified signal to a second transmitter for transmission of the linearly amplified QAM modulated signal, wherein said second transmitter is operated in a different Radio Frequency (RF) band than said first transmitter; and

a diversity receiver and demodulator system for receiving and demodulating transmitted modulated signal.

2. The system of claim 1 wherein said diversity receiver and demodulator comprises a receive filter and receive processor for filtering, processing and providing demodulated cross-correlated in-phase and quadrature-phase filtered signal, wherein said receive filter is mis-matched to said first transmit baseband filter.

3. The system of claim 1 wherein said first transmit baseband filter provides a cross-correlated in-phase and quadrature-phase filtered baseband signal to said modulator for modulating a first bit rate signal into a Gaussian filtered modulated signal.

4. The system of claim 1 wherein said first transmit baseband filter provides a time division multiplexed (TDM) Gaussian filtered baseband signal to said modulator for modulating Gaussian filtered modulated signal.

5. The system of claim 1 wherein said Quadrature Amplitude Modulated (QAM) signal comprises Orthogonal Frequency Division Multiplexed (OFDM) in-phase and quadrature-phase baseband modulated signal.

6. The system of claim 1 wherein said first transmit baseband filter provides cross-correlated in-phase and quadrature-phase filtered baseband signal and said second transmit filter provides Orthogonal Frequency Division Multiplexed (OFDM) filtered signal.

7. The system of claim 1 wherein said first transmitter and second transmitter transmit in different radio frequency (RF) bands.

8. The system of claim 1 wherein said Gaussian filtered modulated signal is used in a cellular network and said QAM modulated signal is used in a wireless network, wherein said cellular and said wireless networks are different networks.

9. A system comprising:

a processor, transmit baseband filter and modulator for processing, filtering and modulating a first bit rate signal into a cross-correlated in-phase and quadrature-phase Gaussian filtered Gaussian Minimum Shift Keying (GMSK) modulated signal;

a second processor and modulator for filtering and modulating a second bit rate signal into a Quadrature Amplitude Modulated (QAM) signal, wherein second bit rate is different from first bit rate;

a first amplifier and first transmitter for amplifying and for providing amplified signal to a first transmitter for transmission of the amplified cross-correlated in-phase and quadrature-phase filtered GMSK modulated signal;

a second amplifier and second transmitter for amplifying and for providing amplified signal to a second transmitter for transmission of the amplified QAM modulated signal, wherein said second transmitter is operated in a different Radio Frequency (RF) band than said first transmitter; and

a receiver and demodulator system for receiving and demodulating transmitted modulated signal, said receiver comprising two antennas.

10. The system of claim 9 wherein said receiver and demodulator system for receiving and demodulating transmitted GMSK modulated signal comprises a receive filter and receive processor for filtering, processing and providing demodulated cross-correlated in-phase and quadrature-phase filtered signal, wherein said receive filter is mis-matched to said transmit filter.

11. The system of claim 9 wherein said QAM signal comprises Orthogonal Frequency Division Multiplexed (OFDM) in-phase and quadrature-phase baseband modulated signal.

12. The system of claim 9 wherein said spread spectrum signal comprises cross-correlated in-phase and quadrature-phase filtered signal.

13. The system of claim 9 wherein said filtered GMSK transmitted signal is used in a cellular network and said QAM signal is used in a Orthogonal Frequency Division Multiplexed (OFDM) wireless network and said cellular and said wireless networks are different networks.

14. The system of claim 9 wherein said Quadrature Amplitude Modulated (QAM) signal comprises a Orthogonal Frequency Division Multiplexed (OFDM) modulated signal.

15. A system comprising:

a first processor, transmit baseband filter and modulator for filtering and modulating a first bit rate signal into a Gaussian shaped and filtered modulated signal;

a second processor and modulator for processing a signal into a second bit rate spread spectrum signal and for modulating said spread spectrum signal into spread spectrum Quadrature Phase Shift Keying (QPSK) modulated signal;

a third processor and modulator for processing a third bit rate signal into a Quadrature Amplitude Modulated (QAM) signal;

a first amplifier and first transmitter for amplifying and for providing amplified signal to a first transmitter, operated in a first Radio Frequency (RF) band, for transmission of the amplified Gaussian filtered modulated signal;

a second amplifier and second transmitter for amplifying and for providing amplified signal to a second transmitter, operated in a second Radio Frequency (RF) band, for transmission of the amplified spread spectrum modulated signal;

a third amplifier and third transmitter amplifying and providing amplified signal to a third transmitter, operated in a third RF band for transmission of the amplified QAM modulated signal, wherein said first, second and third RF bands are distinct bands; and

a receiver and demodulator system for receiving and demodulating transmitted Gaussian shaped and filtered, QPSK and QAM modulated signal, said receiver comprising a diversity receiver.

16. The system of claim 15 wherein said wherein said spread spectrum signal comprises cross-correlated in-phase and quadrature-phase filtered signal.

17. The system of claim 15 wherein said diversity receiver comprises a demodulator, a receive filter and receive processor for filtering, processing and providing demodulated cross-correlated in-phase and quadrature-phase filtered signal.

18. The system of claim 15 wherein said first processor, transmit baseband filter provides cross-correlated in-phase and quadrature-phase filtered signal.

19. The system of claim 15 wherein said diversity receiver and demodulator comprises a receive filter and receive processor for filtering, processing and providing demodulated cross-correlated in-phase and quadrature-phase filtered signal, wherein said receive filter is mis-matched to said first transmit baseband filter.

20. The system of claim 15 wherein said first processor provides cross-correlated in-phase and quadrature-phase filtered signal, said second processor provides cross-correlated in-phase and quadrature-phase filtered spread spectrum signal and said third processor provides Orthogonal Frequency Division Multiplexed (OFDM) cross-correlated in-phase and quadrature-phase filtered signal.