Agile RF band OFDM spread spectrum and cross-correlated systems

• US 7,418,028 B2
• Filed: 08/10/2006
• Issued: 08/26/2008
• 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:
  US11/502,720
• Publication Number:
  US 20060274838A1
• Time in Patent Office: 747 Days
• Field of Search: 375/142, 375/146, 375219-220, 375259-260, 375/271, 375/278, 375283-285, 375/295, 375/297, 375/302, 370/206, 370/208, 370/210, 370/279, 370/284, 370/320, 370/335, 370/342, 370/350, 370/465, 370/480, 370/503, 370/536, 455/91, 455/102, 455/110, 455/113
• US Class Current: 375/141
• 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

Agile Radio Frequency (RF) band selectable systems and circuits process and provide selection of baseband filtered Orthogonal Frequency Division Multiplexed (OFDM) modulated signals, of spread spectrum (SS) modulated signals and of baseband in-phase (I) and quadrature-phase (Q) shaped and or filtered baseband cross-correlated and modulated signals. A selector selects one or more of the filtered and or shaped RF modulated signals and provides the selected signal to the transmission medium.

RF tunable (RF agile) circuits receive a first baseband filtered and modulated signal at a first bit rate and provide a first RF modulated signal in a first specified RF band and receive a second baseband waveform shaped and modulated signal at a second bit rate and provide waveform shaped and modulated RF signal in a second specified RF band, with the second specified RF band having a different specified RF band than the first specified RF band and the first bit rate being different than the second bit rate. A selector selects one of the RF modulated signals and provides the selected signal to the transmission medium.

Claims

1. An agile Radio Frequency (RF) band selectable system comprising:

an agile radio frequency_(RF) circuit for receiving a first baseband filtered and modulated signal at a first bit rate and for providing a first RF modulated signal in a first specified RF band and for receiving a second baseband waveform shaped and modulated signal at a second bit rate and for providing a second RF modulated signal in a second specified RF band, said second specified RF band having a different specified RF band than the first specified RF band and said first bit rate being different than said second bit rate; and

a selector for selecting one of the said first and second RF modulated signals and providing the selected signal to the transmission medium,

wherein the first baseband filtered and modulated signal is obtained by processing and modulation of cross-correlated in-phase and quadrature-phase baseband signals.

2. The system as in claim 1 wherein said first baseband filtered and modulated signal is a Gaussian Minimum Shift Keying (GMSK) modulated signal.

3. The system as in claim 1 wherein said first baseband filtered and modulated signal is a Time Division Multiplexed (TDM) modulated signal.

4. A Radio Frequency (RF) band selectable system comprising:

a tunable radio frequency_(RF) circuit for receiving a baseband filtered and modulated signal and providing a first RF modulated signal in a first specified RF band and for receiving an Orthogonal Frequency Division Multiplexed (OFDM) modulated signal or a spread spectrum (SS) modulated signal and providing a second RF modulated signal in a second specified RF band, said second specified RF band being in a different specified RF band than the first specified RF band; and

a selector for selecting one of the said RF modulated signals or both said RF modulated signals and providing the selected signal to the transmission medium,

wherein the said first baseband filtered and modulated signal comprises processed shaped cross-correlated in-phase and quadrature-phase baseband signals.

5. The system as in claim 4 wherein the spread spectrum signals are comprised of Code Division Multiple Access (CDMA) signals.

6. A Radio Frequency (RF) system comprising:

a radio frequency_(RF) circuit for receiving a baseband filtered and modulated signal and providing a first RF modulated signal in a first RF band and for receiving a baseband shaped cross-correlated in-phase and quadrature-phase and modulated signal and providing a second RF modulated signal in a second RF band, said second RF band using a different RF band than the first RF band; and

a selector for selecting one or more of the said RF modulated signals and providing the selected signal to a signal transmitter for transmission of the selected signal.

7. The system as in claim 6 wherein said first RF modulated signal is a spread spectrum modulated signal.

8. The system as in claim 6 wherein said first RF modulated signal is an Orthogonal Frequency Division Multiplexed (OFDM) modulated signal.

9. A Radio Frequency (RF) system comprising:

a radio frequency_(RF) circuit for receiving a baseband cross-correlated shaped and filtered in-phase and quadrature-phase modulated signal and providing a first RF modulated signal in a first specified RF band and for receiving an Orthogonal Frequency Division Multiplexed (OFDM) modulated signal or a spread spectrum (SS) modulated signal and providing a respective one of said OFDM and SS modulated signals in a second specified RF band, said second specified RF band being a different specified RF band than the first specified RF band; and

a selector for selecting one or more of the said RF modulated signals and providing the selected signal to the transmission medium.

10. The system as in claim 9 wherein said baseband cross-correlated shaped and filtered in-phase and quadrature-phase modulated signal is a Gaussian Minimum Shift Keying (GMSK) modulated signal.

11. A Radio Frequency (RF) system comprising:

a radio frequency_(RF) circuit for receiving a baseband filtered and modulated signal and providing a first RF modulated signal using a first RF band and for receiving a baseband Orthogonal Frequency Division Multiplexed (OFDM) modulated signal and providing a second RF modulated signal in a second RF band, said second RF band using a different RF band than the first RF band; and

a selector for selecting one of said RF modulated signals and providing the selected signal to a signal transmitter for transmission of the selected signal,

wherein said baseband filtered and modulated signal is a baseband cross-correlated shaped and filtered in-phase and quadrature-phase and modulated signal.

12. The system as in claim 11 wherein said baseband filtered and modulated signal is a Gaussian Minimum Shift Keying (GMSK) modulated signal.