Diversity wireless systems

• US 20080219362A1
• Filed: 10/15/2007
• Published: 09/11/2008
• Est. Priority Date: 08/10/1998
• Status: Active Grant

• Current Assignee: Kamilo Feher
• Original Assignee: Kamilo Feher
• Inventors: Feher, Kamilo
• Granted Patent: US 7,545,883 B2
• Time in Patent Office: Days
• US Class Current: 375/260
• 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

Diversity wireless system, processor, cross-correlator, transmit baseband filter and modulator for processing, cross-correlating, filtering, modulating and providing a first and a second bit rate signal to a transmission system for transmission of the processed, filtered, modulated signal. Transmission system having two transmitters for transmission of the modulated signal. Diversity receiver system with two receivers for receiving the transmitted modulated signal and for providing received signal to a demodulator. Demodulator, receive baseband filter and receive processor for demodulation, filtering and processing received signal. Receive baseband filter for filtering is mismatched to the transmit baseband filter for filtering of the first bit rate signal and receive processor for processing first bit rate demodulated baseband filtered signal provides received baseband mis-match filtered cross-correlated in-phase and quadrature-phase signal. Processor and transmit baseband filter for processing and filtering a signal into a cross-correlated filtered and into a cross-correlated spread spectrum in-phase and quadrature-phase baseband signal. Processor, first and second modulator for processing and baseband filtering a signal into time division multiplexed (TDM) filtered signal and into Orthogonal Frequency Division Multiplexed (OFDM) signal and for providing processed TDM filtered and processed OFDM signal to two modulators for modulation, transmission and diversity reception.

Claims

1. A system comprising:

a processor, cross-correlator, transmit baseband filter and modulator for processing, cross-correlating, filtering, modulating and providing a first and a second bit rate signal to a transmission system for transmission of the processed, filtered, modulated signal;

a transmission system comprising two transmitters for wireless transmission of the modulated signal;

a diversity receiver system comprising two receivers for receiving the transmitted modulated signal and for providing received signal to a demodulator; and

a demodulator, receive baseband filter and receive processor for demodulation, filtering and processing received signal, wherein the receive baseband filter for filtering is mismatched to the transmit baseband filter for filtering of the first bit rate signal and receive processor for processing first bit rate demodulated baseband filtered signal provides received baseband mis-match filtered cross-correlated in-phase and quadrature-phase signal.

5. The system of claim 1, wherein the processor, cross-correlator and transmit baseband filter comprises a first cross-correlator for providing cross-correlated time division multiplex (TDM) or time division multiple access (TDMA) filtered signal and a second cross-correlator for providing cross-correlated spread spectrum in-phase and quadrature-phase signal.

6. The system of claim 1, wherein the processor for processing second bit rate signal comprises a cross-correlator for providing cross-correlated Orthogonal Frequency Division Multiplex (OFDM) in-phase and quadrature-phase signal.

7. The system of claim 1, wherein the two transmitters comprise a first amplifier, operated in a non −

linearly amplified (NLA) mode, for non-linear amplification of first bit rate modulated signal and for providing the NLA signal to a first antenna and a second amplifier, operated in a linearly amplified mode, for linear amplification of second bit rate modulated signal and for providing the linearly amplified signal to a second antenna.

8. The system of claim 1, wherein the diversity receiver for receiving the second bit rate modulated signal comprises a linear Automatic Gain Control (AGC) circuit operated in a linear mode and for receiving the second bit rate modulated signal comprises a non-linear AGC circuit operated in a non-linear mode.

9. The system of claim 1, wherein the diversity receiver comprises a Non-Redundant Error Detection (NRED) circuit for error detection of the received signal.

10. The system of claim 1, wherein the first bit rate baseband signal is a Gaussian shaped and or Gaussian filtered signal.

11. The system of claim 1, wherein the first radio frequency (RF) amplifier operated in a first RF band for amplification of the first bit rate modulated signal is an amplifier operated in a linear or a linearized mode and the second RF amplifier operated in a second RF band for amplification of the second bit rate modulated signal is operated in a nonlinear or saturated mode.

12. The system of claim 1, wherein the receiver for receiving the transmitted signal comprises a non-linear Automatic Gain Control (AGC) circuit operated in a non-linear mode.

2. A system comprising:

a processor and transmit baseband filter for processing and filtering a signal into a cross-correlated filtered and into a cross-correlated spread spectrum in-phase and quadrature-phase baseband signal and providing the first and second bit rate signal to a modulator for modulation;

a modulator for modulation of cross-correlated filtered and cross-correlated spread spectrum signal and for providing the modulated signal to a transmitter for transmission of the modulated signal;

a receiver system comprising a first and a second receiver for receiving the transmitted modulated signal and for providing received signal to a demodulator system; and

a demodulator system comprising a demodulator, baseband filter and processor for demodulation, filtering and processing received signal, wherein the receive baseband filter used for filtering of the cross-correlated filtered signal is mismatched to the transmit baseband filter used for filtering of the cross-correlated filtered signal and receive baseband filter and processor for filtering and processing demodulator demodulated baseband filtered signal provides cross-correlated filtered in-phase and quadrature-phase signal.

13. The system of claim 2, wherein the receiver comprises a diversity receiver with a non-linear Automatic Gain Control (AGC) circuit operated in a non-linear mode.

14. The system of claim 2, wherein the receiver comprises a Non-Redundant Error Detection (NRED) circuit for error detection of the received signal.

15. The system of claim 2, wherein the transmitter comprise a first amplifier, operated in a non-linearly amplified (NLA) mode, for non-linear amplification of modulated signal and for providing the NLA signal to a first antenna and a second amplifier, operated in a linearly amplified mode, for linear amplification of modulated signal and for providing linearly amplified signal to a second antenna.

16. The system of claim 2, wherein the cross-correlated filtered signal is a time division multiplexed (TDM) signal.

3. A system comprising:

a processor, first and second modulator for processing and baseband filtering a first bit rate signal into time division multiplexed (TDM) filtered signal and a second bit rate signal into Orthogonal Frequency Division Multiplexed (OFDM) signal and for providing processed TDM filtered signal to first modulator and processed OFDM signal to second modulator for modulation and for providing modulated TDM and OFDM signal to a transmission system for transmission of the modulated signal;

a transmission system comprising two distinct transmitters for transmission of the modulated signal;

a receiver system comprising a first and a second receiver for receiving the transmitted modulated signal and for providing received signal to a demodulator system;

a demodulator system comprising a demodulator, baseband filter and processor for demodulation, filtering and processing received signal, wherein the receive baseband filter used for filtering of the TDM signal is mis-matched to the transmit baseband filter used for filtering of the TDM signal and processor for processing demodulator demodulated TDM baseband filtered signal provides baseband filtered cross-correlated in-phase and quadrature-phase signal; and

a selector or combiner for selecting or combining the demodulated signal, received from the first receiver or from the second receiver or from both first and second receivers and for providing selected or combined demodulated signal to an output interface device.

17. The system of claim 3, wherein the two distinct transmitters comprise a first amplifier operated in a linear or a linearized mode and a second amplifier operated in a nonlinear or saturated mode.

18. The system of claim 3, wherein the receiver comprises a diversity receiver and a non-linear Automatic Gain Control (AGC) circuit operated in a non-linear mode.

19. The system of claim 3, wherein the receiver comprises a Non-Redundant Error Detection (NRED) circuit for error detection of the received signal.

4. A system comprising:

a processor, transmit baseband filter and modulator system for processing, filtering, modulating and providing a first and a second bit rate signal to a modulation system for modulation and transmission of the processed, filtered, modulated signal;

a modulation system comprising two modulators for modulation of the modulated signal and for providing modulated signal to a transmission system;

a transmission system comprising two transmitters for transmission of the modulated signal;

a receiver system comprising two receivers for receiving the transmitted modulated signal and for providing received signal to a demodulator; and

a demodulator, receive baseband filter and receive processor for demodulation, filtering and processing received signal, wherein the receive baseband filter for filtering is mismatched to the transmit baseband filter for filtering of the first bit rate signal and receive processor for processing first bit rate demodulated baseband filtered signal provides received baseband mis-match filtered cross-correlated in-phase and quadrature-phase signal.

20. The system of claim 4, wherein the receiver comprises a Non-Redundant Error Detection (NRED) circuit for error detection of the received signal.

21. The system of claim 4, wherein the receiver for receiving the transmitted signal comprises a diversity receiver comprising Non-Redundant Error Detection (NRED) circuit for error detection of the received signal.

22. The system of claim 4, wherein the processor and transmit baseband filter comprise a cross-correlator processor and filter for cross-correlating and filtering signals and for providing signals into a cross-correlated spread spectrum in-phase and quadrature-phase baseband signal.

23. The system of claim 4, wherein the processor and transmit baseband filter comprise a cross-correlator processor for processing for cross-correlating and a Orthogonal Frequency Division Multiplex (OFDM) processor for providing OFDM processed filtered signal.

24. The system of claim 4, wherein the processor and transmit baseband filter comprise time division multiplex (TDM) or time division multiple access (TDMA) and Orthogonal Frequency Division Multiplex (OFDM) processor and cross-correlator and filter for providing cross-correlated filtered time division multiplex (TDM) or time division multiple access (TDMA) in-phase and quadrature-phase signal and a second cross-correlator and filter for providing cross-correlated filtered Orthogonal Frequency Division Multiplex (OFDM) in-phase and quadrature-phase signal.