Methods of operating a transceiver including an antenna having a plurality of antenna feed elements are presented. The methods include defining a plurality of antenna gain constraint values gk associated with K geographic constraint points within a geographic region, iteratively generating M antenna
Methods of operating a transceiver including an antenna having a plurality of antenna feed elements are presented. The methods include defining a plurality of antenna gain constraint values gk associated with K geographic constraint points within a geographic region, iteratively generating M antenna feed element weights wM that result in antenna response values fK at the K geographic constraint points based on the corresponding antenna gain constraint values gK, forming an antenna beam from the antenna to the geographic region using the antenna feed element weights wM, and communicating information over the antenna beam. Related transceivers, satellites, and satellite gateways are also disclosed.
대표청구항▼
1. A method of operating a transceiver including an antenna having a plurality of antenna feed elements, the method comprising: defining a plurality of antenna gain constraint values gk associated with K geographic constraint points within a geographic region;iteratively generating M antenna feed el
1. A method of operating a transceiver including an antenna having a plurality of antenna feed elements, the method comprising: defining a plurality of antenna gain constraint values gk associated with K geographic constraint points within a geographic region;iteratively generating M antenna feed element weights wM in an antenna feed element weight vector wεCM×1 that result in antenna response values fK at the K geographic constraint points such that beam gain response values |fk| converge on the corresponding antenna gain constraint values gK;forming an antenna beam from the antenna to the geographic region using the antenna feed element weights wM; andcommunicating information over the antenna beam;wherein iteratively generating the antenna feed element weight vector w comprises:defining a cost function that relates the antenna beam gain constraint values gK to the antenna feed element weights wM;specifying an initial vector w1 of the antenna feed element weights wM;evaluating the cost function using the initial vector w1 of the antenna feed element weights wM;generating a gradient of the cost function, anditeratively modifying the antenna feed element weight vector w and evaluating the cost function using the antenna feed element weight vector w while the value of the cost function is decreasing, wherein iteratively modifying the antenna feed element weight vector w comprises adjusting the antenna feed element weight vector w in the direction of the gradient of the cost function. 2. The method of claim 1, further comprising iteratively generating the M antenna feed element weights wM that result in antenna response values fK at the K geographic constraint points based on the corresponding antenna gain constraint values gK until the antenna feed element weights wM converge. 3. The method of claim 1, further comprising selecting a vector of the antenna feed element weights in response to the value of the cost function converging. 4. The method of claim 1 further comprising selecting a vector of the antenna feed element weights in response to the value of the cost function no longer decreasing in response to modifying the antenna weights. 5. The method of claim 1, wherein the initial weight vector comprises a conjugate of a beam steering center. 6. The method of claim 1, wherein adjusting the antenna weights comprises adjusting the weights by a fixed step size in the direction of the gradient of the cost function. 7. The method of claim 1, wherein the cost function comprises a sum of squared differences between the antenna gain constraint values gk and the antenna response values fk at the K geographic constraint points. 8. The method of claim 7, further comprising weighting the squared differences between the antenna gain constraint values gk and the antenna response values fk using weighting factors. 9. The method of claim 1, wherein iteratively modifying the antenna weights comprises adjusting the weights by a weight shift vector Δw. 10. The method of claim 9, further comprising generating the weight shift vector Δw based on a set of linearized equations representing the antenna response values fk at the K geographic constraint points. 11. The method of claim 10, further comprising: generating a residual error vector in terms of the weight shift vector Δw;generating a matrix Q that represents partial derivatives of the K antenna beam gain responses with respect to the M feed element weights in response to the residual error vector;forming a vector Δg that represents differences between the actual and desired beam gain responses at each of the K locations of interest;evaluating the cost function using the matrix Q and the vector Δg to form a set of linear equations that relate the vector Δg to the weight shift vector Δw; andsolving the set of linear equations to find the weight shift vector Δw. 12. The method of claim 11, wherein the cost function comprises a sum of squared differences between the antenna gain constraint values gk and the antenna response values fk at the K geographic constraint points. 13. The method of claim 12, further comprising weighting the squared differences between the antenna gain constraint values gk and the antenna response values fk using weighting factors. 14. A transceiver, comprising: an antenna having a plurality of antenna feed elements; andan electronics system including a beam former configured to iteratively generate M antenna feed element weights wM in an antenna feed element weight vector wεCM×1 that result in antenna response values fK at K geographic constraint points based on corresponding antenna gain constraint values gK, and to form an antenna beam from the antenna to the geographic region using the antenna feed element weights;wherein the beam former is further configured to define a cost function that relates the beam gain constraint values gK to the antenna feed element weights wM, to specify an initial vector w1 of the antenna feed element weights wM, to evaluate the cost function using the initial vector w1 of the antenna feed element weights wM, to iteratively modify the antenna feed element weight vector w and evaluate the cost function using the antenna feed element weight vector w while the value of the cost function is decreasing such that beam gain response values |fk| converge towards the beam gain constraint values gk; andwherein the beam former is further configured to generate a gradient of the cost function and to adjust the antenna feed element weight vector w in the direction of the gradient of the cost function. 15. The transceiver of claim 14, wherein the beam former is configured to iteratively generate M antenna feed element weights wM that result in antenna response values fK at K geographic constraint points based on corresponding antenna gain constraint values gK until the antenna feed element weights wM converge. 16. The transceiver of claim 14, wherein the beam former is further configured to select a vector of the antenna feed element weights in response to the value of the cost function converging. 17. The transceiver of claim 14, wherein the beam former is further configured to select a vector of the antenna feed element weights in response to the value of the cost function no longer decreasing in response to modifying the antenna weights. 18. The transceiver of claim 14, wherein the initial weight vector comprises a conjugate of a beam steering center. 19. The transceiver of claim 14, wherein the beam former is further configured adjust the antenna weights by a fixed step size in the direction of the gradient of the cost function. 20. The transceiver of claim 14, wherein the cost function comprises a sum of squared differences between the antenna gain constraint values gk and the antenna response values fk at the K geographic constraint points. 21. The transceiver of claim 20, wherein the beam former is further configured to weight the squared differences between the antenna gain constraint values gk and the antenna response values fk using weighting factors. 22. The transceiver of claim 14, wherein the beam former is further configured to modify the antenna weights by adjusting the weights by a weight shift vector Δw. 23. The transceiver of claim 22, wherein the beam former is further configured to generate the weight shift vector Δw based on a set of linearized equations representing the antenna response values fk at the K geographic constraint points. 24. The transceiver of claim 23, wherein the beam former is further configured to: generate a residual error vector in terms of the weight shift vector Δw;generate a matrix Q that represents partial derivatives of the K antenna beam gain responses with respect to the M feed element weights in response to the residual error vector;form a vector Δg that represents differences between the actual and desired beam gain responses at each of the K locations of interest;evaluate the cost function using the matrix Q and the vector Δg to form a set of linear equations that relate the vector Δg to the weight shift vector Δw; andsolve the set of linear equations to find the weight shift vector Δw. 25. The transceiver of claim 24, wherein the cost function comprises a sum of squared differences between the antenna gain constraint values gk and the antenna response values fk at the K geographic constraint points. 26. The transceiver of claim 25, wherein the beam former is further configured to weight the squared differences between the antenna gain constraint values gk and the antenna response values fk using weighting factors. 27. A communications satellite, comprising: an antenna having a plurality of antenna feed elements; andan electronics system including a beam former configured to iteratively generate M antenna feed element weights wM in an antenna feed element weight vector wεCM×1 that result in antenna response values fK at K geographic constraint points based on corresponding antenna gain constraint values gK, and to form an antenna beam from the antenna to the geographic region using the antenna feed element weights;wherein the beam former is further configured to define a cost function that relates the beam gain constraint values gK to the antenna feed element weights wM, to specify an initial vector w1 of the antenna feed element weights wM, to evaluate the cost function using the initial vector w1 of the antenna feed element weights wM, to iteratively modify the antenna feed element weight vector w and evaluate the cost function using the antenna feed element weight vector w while the value of the cost function is decreasing such that beam gain response values |fk| converge towards the beam gain constraint values gk; andwherein the beam former is further configured to generate a gradient of the cost function and to adjust the antenna feed element weight vector w in the direction of the gradient of the cost function. 28. A satellite gateway, comprising: an electronics system including a beam former configured to iteratively generate M antenna feed element weights wM in an antenna feed element weight vector wεCM×1 for antenna feed elements of an antenna of a remote satellite that result in antenna response values fK at K geographic constraint points based on corresponding antenna gain constraint values gK, and to transmit the complex valued antenna feed element weights to the satellite for use in forming an antenna beam from the satellite antenna to the geographic region; andwherein the beam former is further configured to define a cost function that relates the beam gain constraint values gK to the antenna feed element weights wM, to specify an initial vector w1 of the antenna feed element weights wM, to evaluate the cost function using the initial vector w1 of the antenna feed element weights wM, to iteratively modify the antenna feed element weight vector w and evaluate the cost function using the antenna feed element weight vector w while the value of the cost function is decreasing such that beam gain response values |fk| converge towards the beam gain constraint values gk; andwherein the beam former is further configured to generate a gradient of the cost function and to adjust the antenna feed element weight vector w in the direction of the gradient of the cost function.
연구과제 타임라인
LOADING...
LOADING...
LOADING...
LOADING...
LOADING...
이 특허에 인용된 특허 (126)
Karabinis, Peter D., Additional aggregate radiated power control for multi-band/multi-mode satellite radiotelephone communications systems and methods.
Karabinis,Peter D.; Nguyen,Serge, Additional systems and methods for monitoring terrestrially reused satellite frequencies to reduce potential interference.
Mayfield, William W.; Chang, Donald C. D.; Novak, III, John I., Communication system employing reuse of satellite spectrum for terrestrial communication.
Barratt,Craig H.; Parish,David M.; Uhlik,Christopher R.; Boyd,Stephen; Yun,Louis C.; Goldburg,Marc H., Downlink broadcasting by sequential transmissions from a communication station having an antenna array.
Karabinis, Peter D.; Singh, Rajendra, Integrated or autonomous system and method of satellite-terrestrial frequency reuse using signal attenuation and/or blockage, dynamic assignment of frequencies and/or hysteresis.
Karabinis, Peter D.; Singh, Rajendra, Integrated or autonomous system and method of satellite-terrestrial frequency reuse using signal attenuation and/or blockage, dynamic assignment of frequencies and/or hysteresis.
Dillon Douglas M. ; Gupta Vivek, Method and apparatus for selectively retrieving information from a source computer using a terrestrial or satellite int.
Martinez ReneD. (Newfield NY) Compton Richard C. (Ithaca NY), Method and apparatus for spectrum sharing between satellite and terrestrial communication services using temporal and sp.
Youssefzadeh Emil ; Luecke James R. ; Serafinko Robert E., Method and system for providing rural subscriber telephony service using an integrated satellite/cell system.
S. Lynne Wainfan ; Ellen K. Wesel ; Michael S. Pavloff ; Arthur W. Wang, Method and system for providing wideband communications to mobile users in a satellite-based network.
Karabinis, Peter D., Radiotelephones and operating methods that use a single radio frequency chain and a single baseband processor for space-based and terrestrial communications.
Levin,Lon C.; Karabinis,Peter D., Radioterminals and associated operating methods that alternate transmission of wireless communications and processing of global positioning system signals.
Levin, Lon C.; Karabinis, Peter D., Radioterminals and associated operating methods that transmit position information responsive to change/rate of change of position.
Good, Alexander H.; King, Charlene J.; Swank, Eric A.; Kundra, Monish; Karabinis, Peter D., Reusing frequencies of a fixed and/or mobile communications system.
Dutta, Santanu; Karabinis, Peter D., SYSTEMS AND METHODS FOR HANDOVER BETWEEN SPACE BASED AND TERRESTRIAL RADIOTERMINAL COMMUNICATIONS, AND FOR MONITORING TERRESTRIALLY REUSED SATELLITE FREQUENCIES AT A RADIOTERMINAL TO REDUCE POTENTIAL.
Wiedeman Robert A. ; Monte Paul A, Satellite communications system having distributed user assignment and resource assignment with terrestrial gateways.
Karabinis, Peter D., Satellite communications systems and methods with distributed and/or centralized architecture including ground-based beam forming.
Karabinis,Peter D., Satellite radiotelephone systems providing staggered sectorization for terrestrial reuse of satellite frequencies and related methods and radiotelephone systems.
Wiedeman Robert A. (Los Altos CA) Monte Paul A. (San Jose CA), Satellite telecommunications system using network coordinating gateways operative with a terrestrial communication syste.
Gilhousen Klein S. (San Diego CA) Jacobs Irwin M. (La Jolla CA) Weaver ; Jr. Lindsay A. (San Diego CA), Spread spectrum multiple access communication system using satellite or terrestrial repeaters.
Karabinis, Peter D., Systems and method with different utilization of satellite frequency bands by a space-based network and an ancillary terrestrial network.
Karabinis, Peter D., Systems and methods for controlling a level of interference to a wireless receiver responsive to a power level associated with a wireless transmitter.
Karabinis,Peter D., Systems and methods for increasing capacity and/or quality of service of terrestrial cellular and satellite systems using terrestrial reception of satellite band frequencies.
Karabinis, Peter D., Systems and methods for modifying antenna radiation patterns of peripheral base stations of a terrestrial network to allow reduced interference.
Karabinis, Peter D.; Churan, Gary G., Systems and methods for terrestrial reuse of cellular satellite frequency spectrum in a time-division duplex and/or frequency-division duplex mode.
King Janet L. ; Deininger Richard C. ; Grzemski Kenneth C. ; Hayden Thomas L. ; Sturza Mark A., Technique for sharing radio frequency spectrum in multiple satellite communication systems.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.