Radio system for long-range high-speed wireless communication
Devices and systems, and methods of using them, for point-to-point transmission/communication of high bandwidth signals. Radio devices and systems may include a pair of reflectors (e.g., parabolic reflectors) that are adjacent to each other and configured so that one of the reflectors is dedicated for sending/transmitting information, and the adjacent reflector is dedicated for receiving information. Both reflectors may be in a fixed configuration relative to each other so that they are aligned to send/receive in parallel. In many variations the two reflectors are formed of a single housing, so that the parallel alignment is fixed, and reflectors cannot lose alignment. The device/systems may be configured to allow switching between duplexing modes. These devices/systems may be configured as wide bandwidth zero intermediate frequency radios including alignment modules for automatic alignment of in-phase and quadrature components of transmitted signals.
1. A self-correcting wide-bandwidth zero intermediate frequency radio device, the device comprising:
a controller configured to emit transmission signals into a transmission path, the controller further configured to emit calibration tones;
the first transmission path connected to the controller and including an in-phase/quadrature (IQ) modulator comprising an IQ filter and an IQ up-converter; and
an IQ alignment module, wherein the IQ alignment module is connected to the first transmission path and comprises
a band-limited measuring receiver having a measuring frequency f m wherein the measuring receiver determines a carrier leakage signal based on the level of a calibration tone at f m , further wherein the measuring receiver determines a sideband rejection signal based on the level of a calibration tone at ±½(f m );
wherein the IQ alignment module provides the carrier leakage signal and the sideband rejection signal to the controller.
2. The device of claim 1 , wherein the controller comprises field programmable gate array (FPGA).
3. The device of claim 1 , wherein the measuring receiver comprises a pair of detectors.
4. The device of claim 1 , wherein the IQ alignment module comprises a pair of detectors each configured to receive orthogonal frequency division multiplexed (OFDM) transmission signals.
5. The device of claim 1 , wherein the IQ alignment module comprises a filter, amplifier and analog to digital converter (ADC).
6. The device of claim 1 , wherein the band-limited measuring receiver comprises a filter that sets the measuring frequency f m .
7. The device of claim 1 , wherein the measuring frequency is 10.7 MHz.
8. The device of claim 1 , wherein the controller is configured to emit orthogonal frequency division multiplexed calibration tones during an unused portion of a broadband communication signal frame.
9. The device of claim 1 , wherein the controller is configured to emit orthogonal frequency division multiplexed (OFDM) transmission signals.
10. The device of claim 1 , wherein the controller is configured to adjust device based on the sideband rejection signal and the carrier leakage signal.
11. A method of automatically correcting a wide-bandwidth zero intermediate frequency radio device, the method comprising:
emitting calibration tones from a controller configured to emit broadband communication signals to first transmission path including an in-phase/quadrature (IQ) modulator;
determining a carrier leakage signal based on a level of a calibration tone at a measuring frequency, f m , using an IQ alignment module having a band-limited measuring receiver with the measuring frequency;
determining a sideband rejection signal based on the level of a calibration tone at ±½(f m ); and
providing the carrier leakage signal and sideband rejection signal to the controller.
12. The method of claim 11 , wherein the determining steps comprise determining during an unused portion of a broadband communication signal frame.
13. The method of claim 11 , wherein emitting comprises emitting calibration tones that are orthogonal frequency division multiplexed (OFDM).
14. The method of claim 11 , wherein providing the carrier leakage signal and the sideband rejection signal comprise converting the carrier leakage signal to a digital signal and converting the sideband rejection signal to a digital signal.
15. The method of claim 11 , wherein the measuring frequency is 10.7 MHz.
16. The method of claim 11 , further comprising adjusting the wide-bandwidth zero intermediate frequency radio device based on the sideband rejection signal and the carrier leakage signal.