Transmission/reception of microwave signals broadcast by a satellite with an interactive return link using a spread spectrum protocol
A transmission/reception installation for microwave radio signals, including a unit for transmission/reception including a receiver for receiving the electric signals from the conversion of radio signals received via a terrestrial or satellite link, referred to as forward-link signals, a demodulator for demodulating the electric signals using a first modulation/demodulation protocol, a modulator for modulating electric signals using a second modulation/demodulation protocol that is different than the first protocol, the second protocol being a spread-spectrum protocol, the modulator modulating the signals demodulated by the demodulator, and a converter for converting the electric signals modulated using a spread-spectrum protocol into radio signals that can be transmitted via a satellite link. The installation also includes one or more boxes including a modulator for modulating the electric signals using the first modulation/demodulation protocol, and a coaxial cable connecting the unit for transmission/reception to the boxes.
1. Installation for transmission/reception of microwave radio signals comprising:
a unit for transmission/reception comprising:
a receiver configured for receiving forward link electric signals output from the conversion of received terrestrial or satellite radioelectric signals;
a first demodulator configured for demodulating electric signals, modulated at an intermediate frequency using a first modulation protocol and received from at least one box, using a first demodulation protocol;
an electric signal modulator using a second modulation protocol different from said first demodulation protocol and from said first modulation protocol, said second protocol being a spread-spectrum protocol, said electric signal modulator modulating signals demodulated by said first demodulator; and
a converter configured for converting said electric signals modulated using said spread-spectrum protocol into radioelectric signals that can be transmitted by satellite;
said at least one box including a modulator configured for modulating electric signals at said intermediate frequency using said first modulation protocol; and
a coaxial cable connecting the unit for transmission/reception and each of the at least one box, each of the coaxial cables being configured for:
transporting said forward link electric signals from said unit for transmission/reception to said box;
transporting electric signals output from said modulator using said first modulation protocol from said box to said unit for transmission/reception.
2. The installation according to claim 1 , wherein said electric signal modulator using said second modulation protocol comprises means of using said spread-spectrum protocol operating according to an asynchronous random multiple access spread-spectrum protocol.
3. The installation according to claim 1 , wherein said first modulation protocol and said first demodulation protocol are based on a short-range wireless communication protocol.
4. The installation according to claim 3 , wherein said first modulation protocol and said first demodulation protocol are based on ZigBee, KNX, WiFi, BlueTooth or WiMax.
5. The installation according to claim 1 , wherein said first modulation protocol and said first demodulation protocol are based on a protocol adapted to a wire technology.
6. The installation according to claim 5 , wherein said first modulation protocol and said first demodulation protocol are based on Ethernet or power line carrier PLC technology.
7. The installation according to claim 1 , wherein said unit for transmission/reception comprises means of extracting signalling information from forward link electric signals to set up transmission parameters and/or a clock signal.
8. The installation according to claim 1 , wherein said unit for transmission/reception comprises a second demodulator of said electric signals in the forward link configured for demodulating signals using one of the following standards:
DVB-T;
DVB-T2;
DVB-S;
DVB-S2;
DVB-SH.
9. The installation according to claim 1 , wherein said unit for transmission/reception and/or said box comprise wireless connection means.
10. The installation according to claim 9 , wherein the wireless connection are WiFi, WiMax, BlueTooth, ZigBee or KNX means.
11. The installation according to claim 1 , wherein said electric signals modulated using said spread-spectrum protocol are modulated in the transmission frequency S band or in the transmission frequency C band.
12. The installation according to claim 11 , wherein the electric signals modulated using said spread-spectrum protocol are modulated in the [1980 MHz; 2010 MHz] band.
13. The installation according to claim 1 , wherein said receiver is configured for receiving terrestrial microwave radio signals in the UHF or VHF band.
14. The installation according to claim 1 , wherein said receiver is configured for receiving satellite microwave radio signals in the Ku band or the Ka band.
15. The installation according to claim 1 , wherein said unit for transmission/reception comprises an emitter configured for sending said radioelectric signals that can be transmitted by satellite, to a satellite and/or to a terrestrial reception station.
16. The installation according to claim 1 , wherein the unit for transmission/reception is located outdoors.
17. The installation according to claim 1 , wherein the at least one box is a plurality of user boxes, each of the plurality of boxes being coupled together with the unit for transmission/reception via a microwave coupler/decoupler.
18. An outdoors unit for transmission/reception that can be integrated into an installation, comprising:
a receiver configured for receiving forward link electric signals output from the conversion of radioelectric signals received by terrestrial or satellite system;
a first demodulator configured for demodulating electric signals, modulated at an intermediate frequency using a first modulation protocol and received from at least one box, using a first demodulation protocol;
an electric signal modulator using a second modulation protocol different from said first demodulation protocol and from said first modulation protocol, said second protocol being a spread-spectrum protocol, said electric signal modulator modulating signals demodulated by said first demodulator; and
a converter configured for transforming said electric signals modulated using said spread-spectrum protocol into radioelectric signals that can be transmitted by satellite.
19. Installation for transmission/reception of microwave radio signals comprising:
a unit for transmission/reception comprising:
a receiver that, in use, receives forward link electric signals output from the conversion of received terrestrial or satellite radioelectric signals;
a first demodulator that, in use, demodulates electric signals, modulated at an intermediate frequency using a first modulation protocol and received from a box, using a first demodulation protocol;
an electric signal modulator using a second modulation protocol different from said first demodulation protocol and from said first modulation protocol, said second protocol being a spread-spectrum protocol, said electric signal modulator, in use, modulating signals demodulated by said first demodulator; and
a converter that, in use, converts said electric signals modulated using said spread-spectrum protocol into radioelectric signals that can be transmitted by satellite;
said box including a modulator that, in use, modulates electric signals at said intermediate frequency using said first modulation protocol; and
a coaxial cable connecting the unit for transmission/reception and the box that, in use,
transports said forward link electric signals from said unit for transmission/reception to said box;
transports electric signals output from said modulator using said first modulation protocol from said box to said unit for transmission/reception.
20. The installation according to claim 19 , wherein said first modulation protocol and said first demodulation protocol are based on a short-range wireless communication protocol.
21. The installation according to claim 19 , wherein said first modulation protocol and said first demodulation protocol are based on a protocol adapted to a wire technology.
22. The installation according to claim 19 , wherein said unit for transmission/reception comprises a signal extracting device that, in use, extracts signals information from forward link electric signals to set up transmission parameters and/or a clock signal.