Abstract:
PROBLEM TO BE SOLVED: To provide a method for transmitting data on an orthogonal frequency-division multiplexing carrier, and also to provide a network base station and a user communication device. SOLUTION: An antenna array may transmit a signal decodable by a legacy user communication device designed for compatibility with a legacy set of transmission antennas. A processor 210 may encode a subframe of the signal with a legacy set of common reference symbols and a supplemental set of common reference symbols referring to the antenna array. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To demodulate data transmitted on an orthogonal frequency-division multiple access carrier. SOLUTION: A network base station 106 may have a common antenna set 110 to transmit on a subcarrier via a first effective channel able to be constructed based on at least one common reference symbol. The network base station 106 may have a dedicated antenna set 112 to transmit on a subcarrier via a second effective channel able to be estimated based on at least one dedicated reference symbol. A user equipment device 102 may demodulate a data transmission using the at least one common reference symbol and the at least one dedicated reference symbol. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
A wireless system, which minimizes nulls within the wireless system, while simultaneously providing diversity. A wireless system will now have increased capacity and coverage due to an enhanced signal to interference ratio in the areas of beam overlap. The system uses time or frequency offset on the signals input to an antenna to minimize interference in the regions of beam overlap. Additionally, polarization diversity can be introduced using Butler Matrices in conjunction with array elements to enhance the interference reduction.
Abstract:
A RAKE receiver (112) includes a plurality of fingers (122, 124, 126, 128). Each finger includes a demodulator (402) for demodulating a ray of a multipath signal and a time tracking circuit (404) for controlling the time position of the finger in accordance with time position of the ray. A low delay-spread condition is detected and the positions of two adjacent fingers are controlled to prevent convergence of two or more fingers about a common time position. By maintaining finger timing separation, path diversity is exploited by the RAKE receiver even during the low delay-spread condition to improve receiver performance.
Abstract:
Se divulgan un método, una estacion de base de red y un dispositivo de comunicaciones de usuario para transmitir datos en una portadora con multiplexion por division de frecuencia ortogonal. Un conjunto de antenas puede transmitir una senal decodificable por un dispositivo de comunicaciones de usuario heredado disenado para la compatibilidad con un conjunto heredado de antenas de transmision. Un procesador 210 puede codificar una subtrama de la senal con un conjunto heredado de símbolos de referencia comunes y un conjunto suplementario de símbolos de referencia comunes que se refiere al conjunto de antenas.
Abstract:
Sistema (50, 60), que comprende: una antena (34, 71, 72); un primer circuito (51, 55, 61, 65) que puede hacerse funcionar para proporcionar una primera señal a dicha antena; un segundo circuito (52, 56, 63, 67) que puede hacerse funcionar para proporcionar una segunda señal a dicha antena, estando la segunda señal desfasada en frecuencia con respecto a la primera señal; y en el que dicha antena puede hacerse funcionar para transmitir un primer haz correspondiente a la primera señal con una primera polarización, dicha antena puede hacerse funcionar además para transmitir un segundo haz correspondiente a la segunda señal con una segunda polarización que es ortogonal a la primera polarización, y en el que dicho segundo haz solapado parcialmente se solapa al primer haz y está desfasado en frecuencia con respecto al primer haz para minimizar de ese modo la formación de puntos nulos en el primer haz y el segundo haz.
Abstract:
A wireless system, which minimizes nulls within the wireless system, while simultaneously providing diversity. A wireless system will now have increased capacity and coverage due to an enhanced signal to interference ratio in the areas of beam overlap. The system uses time or frequency offset on the signals input to an antenna to minimize interference in the regions of beam overlap. Additionally, polarization diversity can be introduced using Butler Matrices in conjunction with array elements to enhance the interference reduction.
Abstract:
A wireless system (30) minimizes nulls within the wireless system while simultaneously providing diversity. The system uses time or frequency offset on signals input to an antenna (40, 50, 60, 100) to minimize interference in regions of beam overlap. Additionally, polarization diversity can be introduced using Butler Matrices (69, 70) in conjunction with array elements (102-128) to enhance the interference reduction. As a result, the wireless system has increased capacity and coverage due to an enhanced signal to interference ratio in the areas of beam overlap (O1-O3).
Abstract:
A wireless system, which minimizes nulls within the wireless system, while simultaneously providing diversity. A wireless system will now have increased capacity and coverage due to an enhanced signal to interference ratio in the areas of beam overlap. The system uses time or frequency offset on the signals input to an antenna to minimize interference in the regions of beam overlap. Additionally, polarization diversity can be introduced using Butler Matrices in conjunction with array elements to enhance the interference reduction.