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Transmission/reception of microwave signals broadcast by a satellite with an interactive return channel using a spectral broadening protocol

A spread spectrum, backhaul link technology, applied in the field of transmission/reception equipment, which can solve the problems of high power loss and expensive modulators

Active Publication Date: 2014-11-19
EUTELSAT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although amplification gain is obtained with this solution, the fact is that the power loss of the useful signal on the backhaul link (especially when passing through the coaxial cable) is high and thus requires sufficient amplifiers in the outdoor unit
Also, every box used in the house must be equipped with a modulator that operates using the Asynchronous Random Multiple Access Spread Spectrum protocol employing SPREAD ALOHA type modulation, and this type of modulator is relatively expensive

Method used

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  • Transmission/reception of microwave signals broadcast by a satellite with an interactive return channel using a spectral broadening protocol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0059] The transmission / reception device 1 can operate using a standard terrestrial antenna 3 (for example a "rake" antenna located on the roof of a building or dwelling) in order to receive signals in the UHF or VHF bands including those encoded using the DVB-T or DVB-T2 type protocol. signals including terrestrial digital television streams.

[0060] Transmission / reception equipment 1 includes:

[0061] - unit 2 for transmission / reception outside the house;

[0062] - coaxial cable 10;

[0063] - microwave radio signal coupler / decoupler 9;

[0064] - A number of boxes (in this case two boxes 11 and 11bis are shown), which boxes are to be housed in a building (eg each box is in an apartment).

[0065] The terrestrial antenna 3 receives signals modulated using the DVB-T or DVB-T2 standard, for example in the UHF band (470-862 MHz band).

[0066] The transmission / reception unit 2 includes:

[0067] - an input part 4 capable of receiving the terrestrial electrical signal re...

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Abstract

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.

Description

technical field [0001] The invention relates to a device for the transmission / reception of microwave radio signals. Background technique [0002] Today, digital television programs are broadcast worldwide by terrestrial links (for example using the DVB-T or DVB-T2 standards) or by satellite links (for example using the DVB-S, DVB-S2 or DVB-SH standards). Many devices are installed in the homes of millions of users. [0003] For terrestrial links, the installed equipment is mostly a receiving unit that includes an outdoor unit that includes a receiving antenna that transmits modulated microwave radio signals via a coaxial cable to an indoor unit commonly referred to as a set-top box (STB) (e.g. a "rake" antenna for reception). [0004] For satellite links, most installations are receivers that include an outdoor unit that includes a parabolic reflector that focuses the modulated microwave radio signal on a source called an LNB (Low Noise Block) horn, The LNB converts the r...

Claims

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Application Information

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IPC IPC(8): H04B7/185H04N7/20H04N21/61
CPCH04B1/69H04N21/6112H04N21/6193H04N21/6143H04N7/20H04N21/6162H04N21/643H04B7/18523
Inventor A·阿西迪亚科诺D·V·菲奥科基亚罗
Owner EUTELSAT