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

• US 7,961,815 B2
• Filed: 02/06/2009
• Issued: 06/14/2011
• 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:
  US12/367,420
• Publication Number:
  US 20090141829A1
• Time in Patent Office: 858 Days
• Field of Search: None
• US Class Current: 375/302
• 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 mismatched 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 signals, each including an I and a Q component, wherein the first signal processor is configured to perform a serial to parallel conversion of the digital binary input signal;

a second signal processor for further processing and shaping said I and Q components of each said baseband signals, including limiting the amplitude peaks of said baseband signals;

a quadrature modulator for each of said baseband signals for modulating said I and Q components to provide a first and a second quadrature modulated RF signal;

a power amplifier for each of said baseband signals 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.

2. A transmitter system as claimed in claim 1, further comprising a pair of pass-band filters for each of said baseband signal for filtering said I and Q components in a respective frequency band.

3. A transmitter system as claimed in claim 2, wherein said filters are re-configurable for filtering signals of various bit rates.

4. A transmitter system as claimed in claim 1 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.

5. A transmitter system as in claim 1, wherein said first signal processor is one of a time constrained signal processor and a long response signal processor for processing and formatting said I and Q components.

6. A transmitter 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.

7. A transmitter system as claimed in claim 1, wherein said baseband signals are one of OFDM and CDMA signals.

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

9. A transmitter system comprising:

a first signal processor for receiving an input signal and formatting said input signal into a plurality of baseband signals each including a set of I and Q components;

a second signal processor for further processing and shaping said baseband signals, including limiting the amplitude peaks of said baseband signals;

a plurality of quadrature modulators, each for modulating a respective one of said baseband signals 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

a plurality of antennae for transmitting said amplified RF signals.

10. A transmitter system as in claim 9, where the first signal processor is capable of providing a selectable amount of cross-correlation between said I and Q components of any of said sets of I and Q components.

11. A transmitter system as in claim 9, where the first signal processor is configured to perform a serial to parallel conversion of the input signal.

12. A transmitter system as claimed in claim 9, further comprising a plurality of pass-band filters for filtering said I and Q components of said baseband signals in a respective frequency band said filters being reconfigurable for filtering signals of various bit rates.

13. A transmitter system as in claim 9, wherein said first signal processor is one of a time constrained signal processor and a long response signal processor for processing and formatting baseband signals.

14. A transmitter system as claimed in claim 9, wherein said baseband signals are one of a OFDM and CDMA signals.

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