Wireless transmission system
A wireless data transmitter including: a data modulator adapted to modulate a data signal based on a frequency signal; and at least one antenna adapted to wirelessly transmit the modulated data signal and the frequency signal independently.
1. A wireless data transmitter comprising:
a local oscillator configured to generate an initial frequency signal;
a mixer configured to generate a frequency signal based upon said initial frequency signal and a frequency spreading code signal, the frequency spreading code signal being based upon a random code;
a modulator configured to modulate a data signal based on said frequency signal; and
first and second antennas directly coupled to said modulator and said mixer, respectively, said first and second antennas configured to transmit said modulated data signal and said frequency signal independently, the data signal and the frequency spreading code signal having a same code rate.
2. The wireless data transmitter of claim 1 , wherein said data signal comprises in-phase (I) and quadrature (Q) components.
3. The wireless data transmitter of claim 1 , wherein said first and second antennas are configured to transmit said modulated signal using a first type of polarization, and said frequency signal using a second type of polarization different from said first polarization.
4. The wireless data transmitter of claim 1 , wherein the frequency signal is configured to have energy spread over a plurality of spectra.
5. The wireless data transmitter of claim 3 , wherein said first type of polarization is one of horizontal and vertical polarization, and said second type of polarization is the other of horizontal and vertical polarization.
6. The wireless data transmitter of claim 3 , wherein said first type of polarization is one of clockwise and anti-clockwise circular polarization, and said second type of polarization is the other of clockwise and anti-clockwise circular polarization.
7. A method of wireless data transmission comprising:
generating by a local oscillator an initial frequency signal;
generating by a mixer a frequency signal by mixing said initial frequency signal and a frequency spreading code signal, the frequency spreading code signal being based upon a random code;
modulating by a modulator a data signal based on said frequency signal; and
transmitting said modulated data signal and said frequency signal via first and second antennas directly and respectively coupled to the modulator and the mixer, the data signal and the frequency spreading code signal having a same code rate.
8. The method of claim 7 , further comprising synchronizing the frequency signal with the data signal.