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