Methods and systems for transmission of multiple modulated signals over wireless networks

• US 7,555,054 B2
• Filed: 05/22/2008
• Issued: 06/30/2009
• Est. Priority Date: 08/10/1998
• Status: Expired due to Fees

• Current Assignee: Quarterhill Inc. (f/k/a Wi-LAN Inc.)
• Original Assignee: Quarterhill Inc. (f/k/a Wi-LAN Inc.)
• Inventors: Feher, Kamilo
• Primary Examiner(s): Tran, Khanh C
• Application Number:
  US12/125,741
• Publication Number:
  US 20080219385A1
• Time in Patent Office: 404 Days
• Field of Search: 375/130, 375146-147, 375260-261, 375/267, 375/295, 375/299, 375/316, 370/334, 370/342
• US Class Current: 375/267
• CPC Class Codes: H04B 1/69 Spread spectrum techniques
• CPC Class Codes: H04B 2201/70703 using multiple or variable rates
• CPC Class Codes: H04B 2201/70707 Efficiency-related aspects
• 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 2025/03407 Continuous phase
• CPC Class Codes: H04L 2025/03414 Multicarrier
• CPC Class Codes: H04L 2025/03477 not time-recursive
• CPC Class Codes: H04L 25/03025 using a two-tap delay line
• 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

Abstract

Receiver network for receiving a first filtered modulated transmitted signal in a first RF band and a second modulated transmitted signal in a second RF band and for providing received signals to one or more demodulators. A demodulator and baseband filter for demodulating and filtering the first filtered modulated received signal and for providing filtered demodulated baseband signal by a baseband filter mis-matched to the filter of the first filtered modulated transmitted signal and demodulating the second modulated signal providing a demodulated baseband signal and a selector for selecting either the first or the second demodulated baseband signal. A receiver and demodulation system receiving a first TDMA modulated signal having a first bit rate and for receiving a second modulated signal having a second bit rate and for providing the received signals to a one or more demodulators and for providing cross-correlated demodulated in-phase and quadrature-phase baseband signals and demodulating the second bit rate modulated signal and providing a demodulated baseband signal.

Claims

1. A transmitter system comprising:

a first signal processor for receiving a digital binary input signal and formatting said input signal into at least two baseband signal, each including an I and a Q component;

a pair of pass-band filters for each said baseband signal for filtering said I and Q components in a respective frequency band;

a second signal processor for further processing and shaping said I and Q components;

at least two quadrature modulators for modulating said I and Q components to provide a first and a second quadrature modulated RF signal;

at least two power amplifiers for amplifying said quadrature modulated RF signals to provide amplified RF signals; and

an antenna array with at least two antenna elements for transmitting said respective amplified RF signals,

wherein said first signal processor comprises a cross-correlator for providing a selectable amount of cross-correlation between said I and Q components of any of said baseband signals.

2. A system as in claim 1, wherein said first signal processor is a time constrained signal processor for processing and formatting said I and Q components.

3. A system as in claim 1, wherein said first signal processor is a long response signal processor for processing and formatting said I and Q components.

4. A system as claimed in claim 1, wherein said filters are re-configurable for filtering signals of various bit rates.

5. A system as claimed in claim 1, wherein said second signal processor is further adapted to convert said baseband signals from the time domain into the frequency domain.

6. A system as claimed in claim 1, wherein said second signal processor is adapted to limit the amplitude of said I and Q components.

7. A system as claimed in claim 1, wherein said baseband signals are OFDM signals.

8. A system as claimed in claim 1, wherein said baseband signals are CDMA signals.

9. A system as claimed in claim 1, wherein said baseband signals have different data rates.

10. A transmitter system comprising:

a first signal processor for receiving an input signal and formatting said input signal into a plurality of baseband signals;

a second signal processor for further processing and shaping said baseband signals;

a plurality of quadrature modulators, each for modulating a respective baseband signal to provide a plurality of quadrature modulated RF signals;

a plurality of power amplifiers, each for amplifying said quadrature modulated RF signals, to provide a plurality of amplified RF signals; and

an antenna array for transmitting said amplified RF signals,

wherein said baseband signals are processed as sets of I and Q components and said first signal processor comprises a cross-correlator for providing a selectable amount of cross-correlation between said I and Q components of any of said plurality of sets of I and Q components.

11. A system as claimed in claim 10, further comprising a plurality of pass-band filters for filtering said I and Q components of said baseband signals in a respective frequency band.

12. A system as claimed in claim 11, wherein said filters are re-configurable for filtering baseband signals of various bit rates.

13. A system as in claim 10, wherein said first signal processor is a time constrained signal processor for processing and formatting baseband signals.

14. A system as in claim 10, wherein said first signal processor is a long response signal processor for processing and formatting baseband signals.

15. A system as claimed in claim 10, wherein said second signal processor is adapted to limit the amplitude of said I and Q components.

16. A system as claimed in claim 10, wherein said baseband signals are one of a OFDM and CDMA signals.

17. A system as claimed in claim 10, wherein said baseband signals have different data rates.

18. A transmitter system comprising:

a first signal processor for receiving a digital binary input signal and formatting said input signal into a plurality of baseband signals;

a second signal processor for further processing and shaping said baseband signals;

a plurality of modulators, each for modulating a respective baseband signal, to provide a plurality of modulated RF signals;

a plurality of amplifiers, each for amplifying a respective modulated RF signal, to provide a plurality of amplified RF signals; and

a plurality of antenna elements, each for transmitting a respective amplified RF signals,

wherein said baseband signals are processed as sets of I and Q components and said first signal processor comprises a cross-correlator for providing a selectable amount of cross-correlation between said I and Q components of any of said plurality of sets of I and Q components.

19. The system of claim 18, wherein said second signal processor is limiting the amplitude peaks of said basebands signals.

20. The system of claim 19, wherein the modulators are quadrature modulators.

21. The system of claim 18, wherein the modulators are quadrature modulators.

22. The system of claim 18, wherein said baseband signals are one of OFDM and CDMA signals.

23. The system of claim 18, wherein said baseband signals have different data rates.

24. The system of claim 18, wherein the antenna elements are part of an antenna array.

25. The system of claim 18, further comprising a plurality of filters for filtering said baseband signals.