Abstract:
A station placed on a high-altitude stationary platform includes two main emitter/receiver sets, each configured to establish a main communication link with a remote terminal station or with another station placed on a high-altitude stationary platform and two backup emitter/receiver sets, each configured to establish a backup communication link with a repeater placed on a relay station on the ground or at sea or with a remote terminal station, the station furthermore comprising a control facility configured to selectively activate a main communication link or a backup communication link as a function of an indicator of the operating state of the main communication link.
Abstract:
A transmitter of a binary data stream comprises: a serial/parallel converter to split the binary data stream into m different parallel bit streams, each bit stream having a rate D/m which is m times lower than the initial rate D; m first encoding modules to error-correcting encode each bit stream individually; a time-interleaver to intermix the information bits originating from different encoded bit streams; an encoder to error-correcting encode the m interleaved bit streams into p bit streams; p electro-optical modulators to modulate each of the p bit streams delivered by the interleaver by means of p optical carriers of different wavelengths; and a wavelength-division multiplexer to combine the les p optical carriers into a single optical signal.
Abstract translation:二进制数据流的发送器包括:串行/并行转换器,用于将二进制数据流分解成m个不同的并行比特流,每个比特流具有比初始速率D低m倍的速率D / m; m个第一编码模块,用于对每个比特流进行单独纠错编码; 时间交织器,用于混合源自不同编码比特流的信息比特; 用于将m个交错比特流纠错编码成p比特流的编码器; p电光调制器,以通过不同波长的p个光载波来调制由交织器传送的每个p比特流; 以及波段分割多路复用器,将滤波光载波组合成单个光信号。
Abstract:
A satellite telecommunications system has a global coverage area and a plurality of user terminals distributed in the global coverage area. The global coverage area is covered by a first set of spots which form a regular cellular mesh, and by at least a second set of local spots, irregularly distributed and superimposed geographically on spots of the first set. The spots of the first set of spots have allocated channels with the same frequency capacity, the same channel being re-used by a plurality of different spots, and the local spots of the second set of spots have a special allocated channel having an increased frequency capacity.
Abstract:
An optical signal generation device for quantum key exchange, includes a photon source generating at least one pulse stream, an ADC transducer converting the photons of a pulse stream into a random binary string, a quantum state modulator putting the photons of the pulses into a number and quantum state defined by a control word in order to generate the optical signal from one of the pulse streams, digital computing means: generating at least one random sequence having a given probability distribution and rate, based on the random binary string, generating the control word in accordance with the key exchange protocol based on said at least one random sequence. A payload for a satellite, comprising such an optical signal generation device is also provided.
Abstract:
A satellite-based very-high-throughput system is provided and a web-caching system based on a high-altitude platform station, an aerostat for example, having the advantage of decreasing the throughput required over the feeder link without however requiring a cache server to be installed on board the satellite.
Abstract:
A telecommunications system comprises: at least one station placed on a stationary high-altitude platform comprising propulsion means for remaining stationary around a specified point, the station being suitable for establishing at least one direct bidirectional communication link with another stationary high-altitude platform station; at least one network gateway station on the ground, for setting up communications between a core network and at least one station placed on a stationary high-altitude platform; a plurality of stations placed in drifting balloons for establishing a direct bidirectional communication link with at least one station placed on a stationary high-altitude platform or/and at least one other station placed in a drifting balloon; and a plurality of user terminals for establishing a direct bidirectional communication link with a station placed on a stationary high-altitude platform or/and at least one station placed in a drifting balloon.
Abstract:
An intermediate network for a radiocommunication system, the intermediate network includes one or more stations located on high-altitude platforms in order to connect a set of remote base stations to one or more ground stations. The high-altitude platforms are networked by way of communication links, for example high-speed free-space optical links. The invention also proposes to connect remote base stations positioned outside of the area of coverage of the stations located on high-altitude platforms via for example microwave-link relay stations or base stations at the edge of the area of coverage.
Abstract:
A method is provided for dynamically allocating the radio resources of a satellite and a very high throughput satellite system configured to implement this method. The method of allocation is executed by a piece of ground equipment called a Radio Resource Manager. The method of allocation according to the invention, allocates dynamically in time frequency resources to each spot of the multibeam coverage in accord with the conditions of propagation of the radio signals (in particular the attenuations due to bad weather) prevailing in the spots, with the current and future spot data traffic profile, with the level of interference generated in the neighbouring beams. The method preferentially applies in respect of downgoing forward links, that is to say from the satellite to the user terminals.
Abstract:
A method for transparent on-board routing of data packets at high bit rate is implemented by a telecommunication system comprising an origin transmitting station, a first destination receiving station, a second destination receiving station, and a plurality of at least two satellites. The origin transmitting station segments high bit rate data streams into coded or uncoded packets each having the structure of a coded or uncoded DVB-S2 baseband frame BBFRAME; and the origin transmitting station inserts, for each segmented BBFRAME packet, coded or uncoded, an on-board routing label of a single piece respectively associated with the coded or uncoded BBFRAME packet. The on-board routing label contains an identifier of the destination receiving station associated with the coded BBFRAME packet, out of the first destination receiving station and the second destination receiving station.