초록 ▼

A microwave radio assembly is described including a directional antenna wherein the installation and aiming is simplified. The assembly is attached to the wall-mount fix via gimbals mechanism with one rotation axis for azimuth and one for elevation and the assembly preferably includes a sight mechan

A microwave radio assembly is described including a directional antenna wherein the installation and aiming is simplified. The assembly is attached to the wall-mount fix via gimbals mechanism with one rotation axis for azimuth and one for elevation and the assembly preferably includes a sight mechanism including a pair of visual apertures is located in the radio assembly in a line parallel to the radio antenna radiation direction. The radio assembly further includes a modulation cancellation scheme in full duplex mode.

대표청구항 ▼

1. A transmit-modulation cancellation transceiver, comprising:a transmitting section generating a transmit signal, the transmit signal containing transmitted data having at least two modulated transmit logic levels; a receiving section receiving a receive signal, the receive signal containing at lea

1. A transmit-modulation cancellation transceiver, comprising:a transmitting section generating a transmit signal, the transmit signal containing transmitted data having at least two modulated transmit logic levels; a receiving section receiving a receive signal, the receive signal containing at least two modulated receive logic levels; a mixing stage that mixes said transmit signal with said receive signal to produce a mixed signal; and a demodulator circuit that receives the modulated transmit logic levels and performs conditional demodulation of said mixed signal based on said transmit logic levels of the transmitted data in a manner that recovers said receive logic levels from the mixed signal. 2. The transceiver of claim 1, wherein the modulated transmit logic levels comprise a transmit symbol and the modulated receive logic levels comprise a receive symbol and wherein the transceiver further comprises a control loop for equalizing the symbol timing of said transmit and receive signals, respectively, adjacent the mixing stage.3. The transceiver of claim 2, wherein the control loop further comprises a circuit that modifies an aggregate transmitted baud rate.4. The transceiver of claim 3, wherein the control loop further comprises a symbol timing-error detection circuit.5. The transceiver of claim 4, wherein the symbol timing-error detection circuit further comprises a narrow-band band pass filter connected to the output of the conditional demodulator for monitoring the power spectrum in said narrow band.6. The transceiver of claim 5, wherein the narrow-band band pass filter is centered at the baud rate frequency so that optimal symbol timing is indicated by a minimum power content in said narrow-band band pass filter.7. The transceiver of claim 5, wherein the narrow-band band pass filter is centered at a frequency which is a predetermined fraction of said aggregate transmitted baud rate so that optimal symbol timing is indicated by a maximum power content in said narrow-band band pass filter.8. The transceiver of claim 1, wherein the modulation further comprises Frequency Shift Keying (FSK) that generates FSK modulated transmit signals and FSK modulated receive signals.9. The transceiver of claim 8, wherein the FSK modulated transmit signals and FSK modulated receive signals share a predetermined center frequency for the transmit and receive signals and share a predetermined deviation between the symbols.10. The transceiver of claim 8, wherein the FSK modulated transmit signals and FSK modulated receive signals have a transmit signal center frequency and a receive signal center frequency, wherein the transmit signal center frequency and the receive signal center frequency are different.11. The transceiver of claim 10, wherein the FSK modulated transmit signals and FSK modulated receive signals further comprise binary FSK transmit and receive signals that share a predetermined deviation between the symbols which results in three IF frequencies out of the four combinations of transmit and receive symbol frequencies.12. The transceiver of claim 11 further comprising a symbol deviation control loop.13. The transceiver of claim 12, wherein the symbol deviation loop further comprises a first frequency discriminator centered at one of the mixed IF frequencies, a second frequency discriminator centered at another one of the mixed IF frequencies and followed by a bipolar demodulator that multiplies said second frequency discriminator output by the polarity of the transmitted bit values, and a linear combination circuit that outputs a signal proportional to the transmitted deviation.14. The transceiver of claim 1, wherein said transmit modulation further comprises Phase Shift Keying (PSK) that generates PSK modulated transmit signals and PSK modulated receive signals.15. The transceiver of claim 14, wherein the modulation further comprises quadrature phase shift keying (QPSK).16. The transceiver of claim 15, wherein said QPSK modulation is differential.17. The transceiver of claim 1, wherein the transmit signal is delivered to said mixing stage via the receiving section.18. A method for two way communications over a channel, the method comprising:generating a transmit signal consisting of transmitted data having modulated transmit logic levels to a communication channel; receiving a receive signal consisting of modulated receive logic levels from the communication channel; mixing said transmit signal with said receive signal to produce a mixed signal; and conditionally demodulating said mixed signals based on the values of said modulated transmit logic levels in the transmitted data to reproduce the received logic levels. 19. The method of claim 18 further comprising equalizing the modulated transmit and receive logic levels of said transmit and receive signals, respectively, prior to the mixing step.20. The method of claim 19, wherein the equalization further comprises modifying an aggregate transmitted baud rate.21. The method of claim 20, wherein the equalization further comprises detecting a symbol timing error.22. The method of claim 21, wherein detecting a symbol timing error further comprises monitoring the power spectrum in a narrow band pass filter connected to the output of the conditional demodulator.23. The method of claim 22, wherein the monitoring further comprises determining an optimum symbol timing when a minimum power content is detected by said narrow band pass filter.24. The method of claim 22, wherein the monitoring determining an optimal symbol timing when a maximum power content is detected by said narrow band pass filter.25. The method of claim 18, wherein the modulation further comprises Frequency Shift Keying (FSK) that generates FSK modulated transmit signals and FSK modulated receive signals.26. The method of claim 25, wherein the FSK modulated transmit signals and FSK modulated receive signals share a predetermined center frequency for the transmit and receive signals and share a predetermined deviation between the transmit and receive signal symbols.27. The method of claim 25, wherein the FSK modulated transmit signals and FSK modulated receive signals have a transmit signal center frequency and a receive signal center frequency, wherein the transmit signal center frequency and the receive signal center frequency are different.28. The method of claim 27, wherein the FSK modulated transmit signals and FSK modulated receive signals further comprise binary FSK transmit and receive signals that share a predetermined deviation between the transmit and receive signal symbols which results in three IF frequencies out of four combinations of transmit and receive symbol frequencies.29. The method of claim 28 further comprising determining a symbol deviation.30. The method of claim 18, wherein said modulation further comprises Phase Shift Keying (PSK) that generates PSK modulated transmit signals and PSK modulated receive signals.31. The method of claim 30, wherein the modulation further comprises quadrature phase shift keying (QPSK).32. The method of claim 31, wherein said QPSK modulation is differential.33. The method of claim 18, wherein the transmit signal is delivered to a mixing stage via the receiving section.