Receivers and demodulators for TDMA and other modulated systems
View Patent ↗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.
1. A receiver and demodulation system comprising:
a receiver network for receiving a first filtered modulated signal in a first RF band and a second modulated signal in a second RF band
a demodulator and baseband filter for receiving the first filtered modulated signal and the second modulated signal from the receiver network, for demodulating and filtering the first filtered modulated signal, for providing a first demodulated baseband signal filtered by said baseband filter which is mis-matched to the filter of the first filtered modulated signal and for demodulating the second modulated signal providing a second demodulated baseband signal; and
a selector for selecting either the first or the second demodulated baseband signal.
2. The system as in claim 1 wherein the demodulator demodulating the first filtered modulated signal provides filtered cross-correlated in-phase and quadrature phase baseband signals.
3. The system as in claim 1 wherein the first filtered modulated signal or the second modulated signal is an Orthogonal Frequency Division Multiplexed (OFDM) modulated signal.
4. The system as in claim 1 wherein the first filtered modulated signal or the second modulated signal is a TDM or TDMA modulated signal.
5. The system as in claim 1 wherein the first filtered modulated signal or the second modulated signal is a spread spectrum modulated signal.
6. The system as in claim 1 wherein the first filtered modulated signal is a Gaussian Minimum Shift Keying (GMSK) or a Frequency Shift Keying (FSK) modulated signal and the second modulated signal is a spread spectrum modulated signal.
7. The system as in claim 1 wherein the first filtered modulated signal or the second modulated signal in a Phase Shift Keying (PSK) modulation, or an Offset OQPSK (OQPSK) or a Quadrature Modulation (QM), or a Frequency Modulation (FM) modulated signal.
8. A receiver and demodulation system comprising:
a receiver network for 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 first and second received signals;
a demodulator for demodulating the first received signal and providing a first demodulated baseband signal with cross-correlated demodulated in-phase and quadrature-phase baseband signals, and demodulating the second received signal and providing a second demodulated baseband signal; and
a selector for selecting either the first or the second demodulated baseband signals.
9. The system as in claim 6 wherein the second modulated signal is an Orthogonal Frequency Division Multiplexed (OFDM) modulated signal.
10. The system as in claim 8 wherein the second modulated signal is an Orthogonal Frequency Division Multiplexed (OFDM) modulated signal.
11. The system as in claim 8 wherein the second modulated signal is a spread spectrum modulated signal.
12. The system as in claim 8 wherein the second modulated signal is a Phase Shift Keying (PSK) modulation modulated signal, or a Quadrature Modulation (QM) modulated signal, or a Frequency Modulation (FM) modulated signal.
13. A receiver and demodulation system comprising:
a receiver network for receiving a TDM or TDMA first modulated signal having a first modulation format, first bit rate and first RF spectrum and for receiving a second modulated signal having a second modulation format, second bit rate and second RF spectrum and for providing the first and second received signals;
a demodulator system comprising two or more demodulators for demodulating the first modulated signal and providing a first demodulated baseband signal with cross-correlated demodulated in-phase and quadrature-phase baseband signals and demodulating the second modulated signal and providing a second demodulated baseband signal; and
a selector for selecting either the first or the second demodulated baseband signal.
14. The receiver and demodulation system as in claim 13 wherein the demodulator is comprised of mismatched filters which are mismatched to the filters of the modulator providing the first modulated signal.
15. The receiver and modulation system as in claim 13 wherein the second modulated signal is a TDM or a TDMA modulated signal.
16. The receiver and demodulation system as in claim 13 wherein the second modulated signal is an Orthogonal Frequency Division Multiplexed (OFDM) modulated signal.
17. The receiver and demodulation system as in claim 13 wherein the second modulated signal is a spread spectrum modulated signal.
18. A receiver and demodulation system comprising:
a receiver network for 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 first TDMA modulated signal and the second modulated signal;
a demodulator for receiving the first TDMA modulated signal and the second modulated signal, for demodulating the first TDMA modulated signal and providing a first demodulated baseband signal comprised of cross-correlated demodulated in-phase and quadrature-phase baseband signals, and for demodulating the second modulated signal and providing a second demodulated baseband signal; and
a selector for selecting the first TDMA modulated signal or the second modulated signal.