OFDM, CDMA, spread spectrum,TDMA, cross-correlated and filtered modulation

• US 20050175116A1
• Filed: 04/14/2005
• Published: 08/11/2005
• Est. Priority Date: 08/10/1998
• Status: Active Grant

• Current Assignee: Quarterhill Inc. (f/k/a Wi-LAN Inc.)
• Original Assignee: Kamilo Feher
• Inventors: Feher, Kamilo
• Granted Patent: US 7,079,584 B2
• Time in Patent Office: Days
• 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

Modulators for switched or switched and combined Orthogonal Frequency Division Multiplexed (OFDM), Code Division Multiple Access (CDMA), Spread Spectrum, Time Division Multiple Access (TDMA), cross-correlated and filtered systems. A first modulation circuit for receiving input OFDM baseband signals and a second modulation circuit for receiving input in-phase and quadrature-phase cross-correlated baseband signals, TDMA signals, spread spectrum signals, CDMA signals or other filtered signals. One of the switched or combined modulated Radio Frequency (RF) signals and the other switched or combined modulated RF signals are provided to one or more selected transmitters.

Claims

1. A system comprising:

a first radio frequency (RF) quadrature modulation circuit for receiving input in-phase and quadrature-phase cross-correlated baseband signals and for providing a first modulated RF signal;

a second radio frequency (RF) quadrature modulation circuit for receiving input Orthogonal Frequency Division Multiplexed (OFDM) in-phase and quadrature-phase baseband signals and for providing a second quadrature modulated RF signal; and

a selector for selecting either the first or the second quadrature modulated RF signal or both the first and second quadrature modulated RF signal and providing the selected signal or selected signals to the transmission medium.

2. In a radio frequency (RF) modulator network for receiving baseband signals and transmitting RF modulated signals the improvement comprising two or more RF modulator circuits and a selection circuit, the first modulator is for modulation of cross-correlated baseband signals the second modulator is for modulation of Orthogonal Frequency Division Multiplexed (OFDM) baseband signals;

the selection device selects either the first or the second modulated RF signal or both the first and second modulated RF signals and provides the selected signal or the selected signals to the transmission medium.

3. A system comprising:

a first modulation circuit for receiving an input Orthogonal Frequency Division Multiplexed (OFDM) baseband signal and for providing a modulated signal;

a second modulation circuit for receiving an input baseband filtered signal and for providing a baseband filtered modulated signal;

a network for providing either the OFDM modulated signal or the filtered modulated signal or both the OFDM modulated signal and the filtered modulated signal; and

connection for connecting the provided signal or provided signals to the transmission medium.

4. A system comprising:

a first modulation circuit for receiving Orthogonal Frequency Division Multiplexed (OFDM) in-phase and quadrature-phase baseband signals and for providing a first quadrature modulated signal;

a second modulation circuit for receiving Time Division Multiple Access (TDMA) baseband signals and for providing a second modulated signal; and

a circuit connecting of either the first or the second modulated signal or both the first and second modulated signals and to the transmitter.

5. A system comprising:

a first radio frequency (RF) quadrature modulation circuit for receiving input Code Division Multiple Access (CDMA) in-phase and quadrature-phase baseband signals and for providing a first quadrature modulated RF signal;

a second radio frequency (RF) quadrature modulation circuit for receiving input Orthogonal Frequency Division Multiplexed (OFDM) in-phase and quadrature-phase baseband signals and for providing a second quadrature modulated RF signal; and

a selector for selecting either the first or the second quadrature modulated RF signal and providing the selected signal to one or more antennas.

6. A system comprising:

a first radio frequency (RF) modulation circuit for receiving spread spectrum baseband signals and for providing a first modulated RF signal;

a second radio frequency (RF) modulation circuit for receiving Orthogonal Frequency Division Multiplexed (OFDM) baseband signals and for providing a second modulated RF signal; and

a device for selecting either the first or the second modulated RF signal or both the first and second modulated RF signals and connecting the selected signal or selected signals to one or more transmitters.