Modulation and demodulation format selectable system

• US 7,133,456 B2
• Filed: 07/24/2002
• Issued: 11/07/2006
• Est. Priority Date: 08/10/1998
• Status: Expired due to Fees

• Current Assignee: Quarterhill Inc. (f/k/a Wi-LAN Inc.)
• Original Assignee: Kamilo Feher
• Inventors: Feher, Kamilo
• Primary Examiner(s): TRAN, KHANH C
• Application Number:
  US10/205,478
• Publication Number:
  US 20030048834A1
• Time in Patent Office: 1,567 Days
• Field of Search: 375/142, 375/146, 375/219, 375/220, 375/259, 375/260, 375/271, 375/278, 375/283, 375/284, 375/285, 375/295, 375/297, 375/302, 455/91, 455/102, 455/110, 455/113, 455/130, 455/552.1, 455/553.1, 370/206, 370/210, 370/208, 370/279, 370/284, 370/320, 370/335, 370/342, 370/350, 370/465, 370/480, 370/503, 370/536
• US Class Current: 375/259
• CPC Class Codes: H04B 2201/70703 using multiple or variable rates
• CPC Class Codes: H04B 7/0602 using antenna switching H04B7/0686 takes precedence; antenna beam directivity switching H01Q3/24
• CPC Class Codes: H04B 7/0854 using error minimizing algorithms, e.g. minimum mean squared error [MMSE], "cross-correlation" or matrix inversion
• CPC Class Codes: H04L 1/205 jitter monitoring
• CPC Class Codes: H04L 2025/03414 Multicarrier
• CPC Class Codes: H04L 25/0305 using blind adaptation
• CPC Class Codes: H04L 25/0307 using blind adaptation
• 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 27/01 Equalisers baseband equalizers at the transmitter end H04L25/03343; in analogue transmission systems H04B3/04, H04B7/005
• CPC Class Codes: H04L 27/18 Phase-modulated carrier systems, i.e. using phase-shift keying H04L27/32 takes precedence
• CPC Class Codes: H04L 27/186 in which the information is carried by both the individual signal points and the subset to which the individual signal points belong, e.g. coset coding or related schemes
• 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 5/0008 Wavelet-division
• CPC Class Codes: H04L 5/0016 Time-frequency-code
• CPC Class Codes: H04L 5/0028 Variable division signaling therefor H04L5/0092
• 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

Modulation Demodulation (Modem) Format Selectable (MFS) and Code Selectable (CS) systems for new generations of wireless systems, including third generation “3G”, spread spectrum systems, CDMA,W-CDMA and GSM, OFDM systems having different bit rates, that is having bit rate selection or bit rate agile( BRA) operation. MFS and Code Selectable (CS) systems connected to one or more modulators, one or more transmit amplifiers and one or more antennas. The transmitted signals are received by single or multiple receivers and demodulators.

Shaped Time Constrained Signal(TCS) wavelet processors and bit rate agile Long Response (LR) filters provide shaped Time Constrained Signal (TCS) waveforms/filtered signals in in-phase(I) and quadrature-phase(Q) baseband channels to one or more Quadrature Modulators(QM) connected to the baseband signal processing network. A control processor and signal selection device selects one or more of the baseband signals and provides these signals through one or more quadrature modulators(QM) having the same or different radio frequency(RF) signals for amplification by one or more amplifiers. A selection device for selecting a Linearly and/or a Non-Linearly Amplified (NLA) modulated signal is provided and the selected amplified signal is provided to one or more transmit antenna systems or to one or more transmission media.

Claims

1. A Bit Rate Agile (BRA) modulation-demodulation system comprising:

a baseband signal processing network for receiving baseband signals;

shaped Time Constrained Signal (TCS) wavelet processors and bit rate agile Long Response (LR) filters for providing shaped and filtered in-phase and quadrature-phase baseband signals;

two quadrature modulators connected to the baseband signal processing network for quadrature modulating said shaped and filtered in-phase and quadrature-phase baseband signals;

a switch for selecting one of the quadrature modulated signals;

one or more transmit amplifiers to provide said shaped and filtered quadrature modulated signals to the transmission medium;

a demodulator and bit rate agile baseband filter for demodulating the bit rate agile transmitted signals.

2. The bit rate agile system of claim 1, wherein the TCS wavelets and LR filtered signals are bit rate agile signals.

3. The bit rate agile system of claim 1, wherein the baseband signal processing network receives baseband binary digital signals.

4. The bit rate agile system of claim 1, wherein one or more of said transmit amplifiers operates in a non-linearly amplified (NLA) mode.

5. The bit rate agile system of claim 1, wherein one or both of said quadrature modulators modulate said Time Constrained Signal (TCS) wavelets and Long Response (LR) filtered in-phase and quadrature-phase baseband signals to generate a quadrature output signal.

6. The bit rate agile system of claim 1, wherein one of the transmit amplifiers operates in a saturated mode.

7. The bit rate agile system of claim 1, wherein one of the transmit amplifiers operates in a linearized mode.

8. A modulation-demodulation (modem) format selectable (MFS) bit rate agile communications system comprising:

a baseband signal processing network for receiving baseband signals;

a cross-correlator;

a shaped Time Constrained Signal (TCS) wavelet processor and bit rate agile Long Response (LR) filter structure for providing shaped and filtered signals in in-phase and quadrature-phase baseband channels;

a modulation-demodulation (modem) format selectable or code selectable baseband structure for providing either modem format selectable or code selectable cross-correlated processed and filtered in-phase and quadrature-phase baseband signals;

a modulator for quadrature modulation of the in-phase and quadrature-phase baseband signals

an amplifier comprising linear and nonlinear circuits for linear and/or non-linear amplification of the modulated output signal of said quadrature modulator;

a switch for selecting one or more bit rates and/or one or more modulation-demodulation (modem) formats of said baseband signals; and

a switch or level controller for selecting linearly or non-linearly amplified (NLA) modulated signals for transmission.

9. A modulation format and bit rate selectable system comprising:

one or multiple input ports for receiving two or more baseband input signals;

cross-correlator circuitry;

shaped Time Constrained Signal (TCS) waveform processor and bit rate selectable Long Response (LR) filter circuits;

two or more quadrature modulators;

two or more transmit amplifiers;

two or more baseband signal processing networks for receiving and cross-correlating at least two of the baseband input signals and providing shaped Time Constrained Signal (TCS) processed wavelets and bit rate selectable Long Response (LR) filtered in-phase and quadrature-phase baseband signals to two or more quadrature modulators for quadrature modulation; and

a selection device for selecting at least one of the quadrature modulated signals and for connecting one or more of the selected modulated signals to two or more transmit amplifiers for signal amplification.

10. A modulation format and bit rate selectable system as in claim 9, wherein one of said baseband input signals comprises baseband digital binary input signals.

11. A Modulation-Demodulation Format Selectable (MFS) and bit rate selectable structure comprising:

a baseband signal processing network for receiving baseband input signals and generating cross-correlated shaped Time Constrained Signal (TCS) processed waveforms and Modulation Format Selectable or bit rate selectable Long Response (LR) filtered in-phase (I) and quadrature-phase (Q) baseband signals for quadrature modulation;

one or more quadrature modulation circuits for quadrature modulation of the in-phase and quadrature-phase baseband signals;

input ports for connecting the in-phase and quadrature-phase signals to one or more Quadrature Modulators;

an interface port to provide the quadrature modulated data to two amplifiers, one of said amplifiers operating in a non-linearly amplified mode, while the second amplifier operates in a linearly amplified mode;

a switch for selecting the linearly amplified or non-linearly amplified modulated signal and for providing the selected amplified signal to a transmission medium; and

a receiver interface unit for connecting the transmitted and received signals to a demodulator; and

a demodulator for demodulating the selected modulation format.

12. A Modulation-Demodulation Format Selectable and bit rate selectable structure as in claim 11, wherein said baseband input signals comprise baseband digital binary input signals.

13. A system comprising:

a signal processing network for receiving a single or a plurality of input signals and for providing cross-correlated in-phase and quadrature-phase baseband signals at a first specified bit rate;

a signal processing network for receiving a single or a plurality of input signals and for providing a filtered signal at a second specified bit rate; and

a selector for selecting either the cross-correlated signals or the filtered signal or both the cross-correlated signals and the filtered signal and providing the selected signals to one or more modulators for signal modulation.

14. A system as in claim 13, wherein said input signal comprises baseband digital binary input signals.

15. A modulator comprising:

a first baseband signal processing network for receiving a first specified bit rate digital input signal and providing multilevel baseband waveforms;

a second baseband signal processing network for receiving a second specified bit rate digital input signal and providing cross-correlated in-phase and quadrature-phase baseband waveforms;

a splitter or selector for providing either both the multilevel waveforms and the cross-correlated waveforms, or the multilevel waveforms or the cross-correlated waveforms for modulation;

one or more modulators for modulating either one of the selected or the splitter provided waveforms and providing one or more modulated signals.

16. A modulator as in claim 15, wherein said baseband signals comprise baseband digital binary input signals.

17. A bit rate selectable quadrature modulator-demodulator comprising:

bit rate selectable shaped Time Constrained Signal (TCS) wavelet processor and bit rate selectable Long Response (LR) filter baseband structures for providing bit rate selectable shaped and filtered signals in in-phase and quadrature-phase baseband channels;

a quadrature modulator for modulating the shaped and filtered in-phase and quadrature-phase baseband signals;

a demodulator for demodulating the quadrature modulated signal; and

bit rate selectable demodulator baseband filters which are mis-matched to said bit rate selectable filter baseband structures.

18. A modulator comprising:

two baseband signal processors for receiving distinct bit rate digital signals, one of the said processors comprising a cross-correlator and a Time Constrained Signal (TCS) wavelet processor, operated at a specific bit rate, for providing cross-correlated wavelets having amplitudes modified from the peak amplitudes of Time Constrained Signal (TCS) wavelets in in-phase and quadrature-phase baseband channels and the other baseband signal processor having filters in the in-phase and quadrature-phase baseband channels and providing filtered in-phase and quadrature-phase signals having a bit rate which is different than the bit rate of the specified bit rate of the cross-correlated waveforms; and

a selector or splitter for selecting or providing either the said cross-correlated waveforms or the said filtered signals, or both the cross-correlated waveforms and filtered signals, to one or more modulators.

19. Circuitry for processing first and second bit rate signals comprising:

a cross-correlator for generating cross-correlated in-phase and quadrature-phase baseband signals from a first bit rate signal;

a first quadrature modulator for quadrature modulating the cross-correlated signal;

a filter for filtering a second bit rate signal, said second bit rate signal having a different bit rate than the first bit rate signal, and providing a filtered baseband signal;

a second modulator for modulating the filtered baseband signal; and

switch circuitry for selecting and connecting either the cross-correlated first bit rate modulated signal or the filtered second bit rate modulated signal to a transmission medium.