IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0380770
(2010-06-28)
|
등록번호 |
US-8750934
(2014-06-10)
|
우선권정보 |
FR-09 03132 (2009-06-26) |
국제출원번호 |
PCT/EP2010/059119
(2010-06-28)
|
§371/§102 date |
20120221
(20120221)
|
국제공개번호 |
WO2010/149789
(2010-12-29)
|
발명자
/ 주소 |
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
4 인용 특허 :
1 |
초록
▼
A system is provided for communications between at least two telecommunications devices, at least one being onboard an aircraft, said devices comprising means for sending and/or receiving digital data, said data being classed in at least two categories, the first category corresponding to critical d
A system is provided for communications between at least two telecommunications devices, at least one being onboard an aircraft, said devices comprising means for sending and/or receiving digital data, said data being classed in at least two categories, the first category corresponding to critical data, the second category corresponding to non-critical data. The data are sent on M antennas and received on N antennas. A matrix H of dimension M×N representative of the multi-antenna propagation channel is estimated and the data are sent according to a mode of transmission selected from among at least two multi-antenna modes. A first robust mode uses a scheme of Alamouti type, a second high-speed mode uses a scheme of BLAST type. The critical data are transmitted using the robust mode, the non-critical data being transmitted using one of the two multi-antenna modes. The high-speed mode is selected when the rank RH of the matrix H exceeds a previously chosen threshold value SR.
대표청구항
▼
1. A system for communications between at least two telecommunications devices, at least one of these devices being onboard an aircraft, said devices comprising means for sending and/or receiving digital data, said data being classed in at least two categories, the first category corresponding to cr
1. A system for communications between at least two telecommunications devices, at least one of these devices being onboard an aircraft, said devices comprising means for sending and/or receiving digital data, said data being classed in at least two categories, the first category corresponding to critical data, the second category corresponding to non-critical data, wherein the data are sent on M antennas and received on N antennas, a matrix H of dimension M×N representative of the multi-antenna propagation channel being estimated, the data being sent according to a mode of transmission selected from among at least two multi-antenna modes, a first robust mode using a scheme of Alamouti type, a second high-speed mode using a scheme of BLAST type, the critical data being transmitted using the robust mode, the non-critical data being transmitted using one of the two multi-antenna modes, the high-speed mode being selected when the rank RH of the matrix H exceeds a previously chosen threshold value SR. 2. The communications system as claimed in claim 1, wherein the M sending antennas and the N receiving antennas are arranged in orthogonal polarization diversity. 3. The communications system as claimed in claim 1, wherein at least one of the telecommunications devices is onboard a pilotless aircraft. 4. The communications system as claimed in claim 1, wherein at least one of the telecommunications devices is onboard a terrestrial control station. 5. The communications system as claimed in claim 4, wherein a terrestrial control station comprises at least N sub-stations, a sub-station comprising one of the N receiving antennas, said antennas being aligned according to a receiving axis such that they are spaced a distance dr apart. 6. The communications system as claimed in claim 5, wherein, for a given sending device, the M sending antennas are aligned according to a sending axis and spaced a distance d.sub.t apart such that the following expression is complied with: dt·dr=λ·Lmin(M,N)·cosθin which:L represents the distance between the sender and the receiving axis; λ represents the wavelength of the signals to be transmitted; θ represents the angle between the receiving axis and the sending axis. 7. The communications system as claimed in claim 1, wherein telecommunications devices are onboard at least two aircraft, said devices allowing them to exchange critical and non-critical digital data by selecting one of the multi-antenna modes. 8. The communications system as claimed in claim 7, wherein the transmission of data in multi-antenna mode is activated when the aircraft are flying in formation. 9. The communications system as claimed in claim 1, wherein the sending and receiving devices comprise means for estimating their locations, this estimation allowing said devices to deduce the presence, or the absence of an exploitable direct path between them, the robust mode being activated in the case of absence.
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