Mis-matched modulation-demodulation format selectable filters

• US 7,415,066 B2
• Filed: 10/13/2007
• Issued: 08/19/2008
• Est. Priority Date: 08/10/1998
• Status: Expired due to Fees

• Current Assignee: Kamilo Feher
• Original Assignee: Kamilo Feher
• Inventors: Feher, Kamilo
• Primary Examiner(s): Wang, Ted
• Application Number:
  US11/872,007
• Publication Number:
  US 20080031126A1
• Time in Patent Office: 311 Days
• Field of Search: 375/232, 375/295, 375/297, 455/114.3, 455/127.3, 455/253.2
• US Class Current: 375/232
• CPC Class Codes: H04B 1/406 with more than one transmission mode, e.g. analog and digital modes
• 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

Abstract

Modulation-demodulation format selectable (MFS) processor, cross-correlator and transmit filter for processing, cross-correlating and filtering in-phase and quadrature-phase baseband signal and providing a first bit rate and a second bit rate baseband signal to a modulator and a transmitter for modulation and transmission of the processed filtered baseband signal. Transmit amplifier operated in a first radio frequency (RF) band for amplification of the first bit rate modulated signal and a second RF amplifier operated in a second RF band for amplification of the second bit rate modulated signal. Switch for selecting the first or the second bit rate or first or second modulation format signal and providing selected signal to a transmitter. Receiver for receiving transmitted signal. Demodulator and demodulator filter mis-matched to transmit baseband filter. Receive processor for receiving and processing quadrature demodulator demodulated baseband filtered signal and for providing first and second format cross-correlated in-phase and quadrature-phase baseband signal. Time division multiplex (TDM) and Orthogonal Frequency Division Multiplex (OFDM) processor and transmit baseband filter for processing, filtering and providing TDM and OFDM processed and filtered signal to a modulator, transmitter and receiver. Receiver and demodulator for demodulating and baseband filtering received modulated TDM signal. Demodulator of TDM signal has a demodulator baseband filter which is mis-matched to the transmit baseband filter and provides demodulated baseband mis-matched filtered cross-correlated in-phase and quadrature-phase signal.

Claims

1. A system comprising:

a processor and transmit baseband filter for processing, filtering and providing a first modulation format signal and a second modulation format signal to a modulator and a transmitter for modulation and transmission of the processed filtered baseband signal, wherein first and second modulation formats are distinct modulation formats;

a transmitter comprising a first radio frequency (RF) amplifier operated in a first RF band in a linear or a linearized mode for amplification of the first modulation format modulated signal and a second RF amplifier operated in a second RF band in a nonlinear or saturated mode for amplification of the second modulation format modulated signal, wherein first RF band is distinct from second RF band;

a switch for selecting the first or the second modulation format signal and for providing the selected signal to said modulator for modulation and amplification and for providing the selected amplified signal to a transmission medium;

a receiver for receiving the transmitted signal received from the transmission medium and for providing received signal to a demodulator;

a demodulator and receive baseband filter for demodulation and filtering of the received signal, wherein the receive baseband filter is mis-matched to the transmit baseband filter; and

a receive processor for receiving and processing demodulated baseband filtered signal and for providing a first and second format cross-correlated in-phase and quadrature-phase baseband signal.

2. The system of claim 1, wherein the processor and transmit baseband filter comprises a cross-correlator and filter for providing cross-correlated filtered in-phase and quadrature-phase signal.

3. The system of claim 1, wherein said processor and transmit baseband filter comprises a cross-correlator and filter for providing cross-correlated filtered time division multiplex (TDM) or time division multiple access (TDMA) in-phase and quadrature-phase signal and a second cross-correlator and filter for providing cross-correlated filtered Orthogonal Frequency Division Multiplex (OFDM) in-phase and quadrature-phase signal.

4. The system of claim 1, wherein the processor and transmit baseband filter for processing, filtering, and providing a first modulation format signal and a second modulation format signal to a modulator comprise two cross-correlators for providing cross-correlated time division multiplex (TDM) or time division multiple access (TDMA) and cross-correlated spread spectrum signals.

5. The system of claim 1, wherein the receiver for receiving the transmitted signal comprises a liner Automatic Gain Control (AGC) circuit operated in a liner mode for reception of the first modulation format modulated signal and a non-linear AGC circuit operated in a non-linear mode for reception of the second modulation format modulated signal.

6. The system of claim 1, wherein said processor and transmit baseband filter comprises a time division multiplex (TDM) processor and a cross-correlator for providing cross-correlated filtered in-phase and quadrature-phase signal.

7. A system comprising:

a processor and transmit baseband filter for processing, filtering and providing a first modulation format signal to a first modulator and a second modulation format signal to a second modulator and a transmitter for modulation and transmission of the processed filtered baseband signal, wherein first and second modulation formats are distinct modulation formats and said first and second modulators are distinct modulators; and

a transmitter comprising a first radio frequency (RF) amplifier operated in a first RF band in a linear or a linearized mode for amplification of the first modulation format modulated signal and a second RF amplifier operated in a second RF band in a nonlinear or saturated mode for amplification of the second modulation format modulated signal, wherein first RF band is distinct from second RF band.

8. The system of claim 7, wherein said processor and transmit baseband filter comprises a cross-correlator and filter for providing cross-correlated filtered in-phase and quadrature-phase signal.

9. The system of claim 7, wherein said processor and transmit baseband filter comprises a cross-correlator and filter for providing cross-correlated filtered time division multiplex (TDM) or time division multiple access (TDMA) in-phase and quadrature-phase signal and for providing cross-correlated filtered Orthogonal Frequency Division Multiplex (OFDM) in-phase and quadrature-phase signal.

10. The system of claim 7, wherein said processor and transmit baseband filter comprises two cross-correlators for providing cross-correlated dine division multiplex (TDM) or time division multiple access (TDMA) and cross-correlated spread spectrum signals.

11. The system of claim 7, wherein said transmitter transmits signal to a receiver for receiving a transmitted signal and for providing received signal to a demodulator, said demodulator comprising a receive baseband filter for demodulation and filtering of received signal, wherein the receive baseband filter is mis-matched to said transmit baseband filter and a receive processor for receiving and processing demodulated baseband filtered signal and for providing a cross-correlated in-phase and quadrature-phase baseband signal.

12. A method of processing, modulating and transmitting including the steps of:

processing and transmit filtering an input signal and providing said input signal in a first modulation format signal in a first modulation and a second modulation format signal in a second modulation for modulation and transmission of the processed filtered baseband signal, wherein first and second modulation formats and first and second modulations are distinct modulation formats and distinct modulation steps; and

transmission and amplification of modulated signals by linearly and by nonlinearly amplified radio frequency (RF) signals, whereby said linearly and nonlinearly amplified RF signals are transmitted in different RF bands.

13. The method of claim 12, wherein said processing and transmit filtering an input signal provides a cross-correlated filtered in-phase and quadrature-phase signal.

14. The method of claim 12, wherein said processing and transmit filtering an input signal provides cross-correlated filtered time division multiplex (TDM) or time division multiple access (TDMA) and cross-correlated filtered Orthogonal Frequency Division Multiplex (OFDM) in-phase and quadrature-phase signal.

15. The method of claim 12, wherein said processing and transmit filtering an input signal provides cross-correlated time division multiplex (TDM) or time division multiple access (TDMA) and cross-correlated spread spectrum signals.