. . . . . . "Acc\u00E9s m\u00FAltiple per divisi\u00F3 d'espai (SDMA, acr\u00F2nim de Spatial Division Multiple Access) i \u00E9s un MIMO (Mutiple-Input and Multiple-Output). \u00C9s una arquitectura sense cables basada en m\u00FAltiples antenes i adequada per a comunicacions m\u00F2bils. Permet l'acc\u00E9s al canal identificant la localitzaci\u00F3 de l'usuari i establint una connexi\u00F3 directa entre la divisi\u00F3 de l'amplada de banda de la xarxa i la localitzaci\u00F3 espacial trobada. Aquesta t\u00E8cnica es pot integrar junt amb altres t\u00E8cniques d'acc\u00E9s convencional com FDMA, TDMA i CDMA. En un sistema SDMA l'estaci\u00F3 base no transmet el senyal a trav\u00E9s de tota l'\u00E0rea de la cel\u00B7la com \u00E9s el cas de les t\u00E8cniques d'acc\u00E9s convencional sin\u00F3 que concentra la pot\u00E8ncia en la direcci\u00F3 on es troba la unitat m\u00F2bil que sol\u00B7licita la comunicaci\u00F3 i el mateix fa en recepci\u00F3. La t\u00E8cnica SDMA t\u00E9 diverses caracter\u00EDstiques que fan que la seva introducci\u00F3 en un sistema de r\u00E0dio m\u00F2bil sigui avantatj\u00F3s. La primera \u00E9s que les modificacions necess\u00E0ries es limiten a les estacions base i no involucren les unitats m\u00F2bils. La segona \u00E9s la seva possibilitat de ser integrada amb diferents t\u00E8cniques d'acc\u00E9s m\u00FAltiple (FDMA, TDMA, CDMA) i totes les tecnologies de r\u00E0dio m\u00F2bils existents i per existir."@ca . . . "Space-division multiple access (SDMA) is a channel access method based on creating parallel spatial pipes (focused signal beams) using advanced antenna technology next to higher capacity pipes through spatial multiplexing and/or diversity, by which it is able to offer superior performance in radio multiple access communication systems (where multiple users may need to use the communication media simultaneously). In traditional mobile cellular network systems, the base station has no information on the position of the mobile units within the cell and radiates the signal in all directions within the cell in order to provide radio coverage. This method results in wasting power on transmissions when there are no mobile units to reach, in addition to causing interference for adjacent cells using the same frequency, so called co-channel cells. Likewise, in reception, the antenna receives signals coming from all directions including noise and interference signals. By using smart antenna technology and differing spatial locations of mobile units within the cell, space-division multiple access techniques offer attractive performance enhancements. The radiation pattern of the base station, both in transmission and reception, is adapted to each user to obtain highest gain in the direction of that user. This is often done using phased array techniques."@en . . . . "381917"^^ . . . "\u7A7A\u5206\u591A\u5740\uFF08\u82F1\u8A9E\uFF1ASpace-division multiple access\uFF0C\u7E2E\u5BEB\u70BA SDMA\uFF09\u662F\u4E00\u79CD\u65B0\u53D1\u5C55\u7684\u591A\u5740\u6280\u672F\uFF0C\u5B83\u5728\u65E0\u7EBF\u591A\u5740\u901A\u4FE1\u7CFB\u7EDF\u4E2D\u53EF\u589E\u52A0\u57FA\u7AD9\u8986\u76D6\u8303\u56F4\uFF0C\u4ECE\u800C\u964D\u4F4E\u7F51\u7EDC\u6210\u672C\u3002\u964D\u4F4E\u6765\u81EA\u5176\u5B83\u7CFB\u7EDF\u548C\u5176\u5B83\u7528\u6237\u7684\u5E72\u6270\uFF0C\u63D0\u9AD8\u7CFB\u7EDF\u5BB9\u91CF\uFF0C\u63D0\u9AD8\u9891\u7387\u5229\u7528\u7387\u3002 \u5728\u4F20\u7EDF\u7684\u8702\u7A9D\u79FB\u52A8\u7F51\u7EDC\u7CFB\u7EDF\u4E2D\uFF0C\u57FA\u7AD9\u5728\u5404\u4E2A\u65B9\u5411\u8F90\u5C04\u4FE1\u53F7\u4EE5\u63D0\u4F9B\u533A\u57DF\u65E0\u7EBF\u8986\u76D6\u3002\u8FD9\u5C06\u5728\u6CA1\u6709\u79FB\u52A8\u5355\u5143\u7684\u4F4D\u7F6E\u4E0A\u6D6A\u8D39\u529F\u7387\uFF0C\u5E76\u5BF9\u76F8\u90BB\u5C0F\u533A\uFF08\u4F7F\u7528\u76F8\u540C\u9891\u7387\uFF0C\u79F0\u4E3A\u5171\u4FE1\u9053\u5355\u5143\uFF09\u9020\u6210\u5E72\u6270\u3002\u540C\u6837\uFF0C\u5728\u63A5\u6536\u7AEF\uFF0C\u5929\u7EBF\u63A5\u6536\u5305\u62EC\u566A\u58F0\u548C\u5E72\u6270\u4FE1\u53F7\u5728\u5185\u7684\u6240\u6709\u65B9\u5411\u7684\u4FE1\u53F7\u3002\u901A\u8FC7\u4F7F\u7528\u667A\u80FD\u5929\u7EBF\u6280\u672F\uFF0C\u7A7A\u5206\u591A\u5740\u6280\u672F\u63D0\u4F9B\u4E86\u6709\u5438\u5F15\u529B\u7684\u6027\u80FD\u589E\u5F3A\u3002\u57FA\u7AD9\u5728\u53D1\u9001\u4E2D\u7684\u8F90\u5C04\u65B9\u5411\u9002\u5408\u4E8E\u7528\u6237\uFF0C\u7528\u6237\u53EF\u83B7\u5F97\u8BE5\u65B9\u5411\u4E0A\u7684\u6700\u9AD8\u589E\u76CA\u3002\u53E6\u5916\uFF0CSDMA\u4E0E\u4EFB\u4F55\u8C03\u5236\u65B9\u5F0F\u3001\u5E26\u5BBD\u6216\u9891\u6BB5\u517C\u5BB9\uFF0C\u5305\u62ECAMPS\u3001GSM\u3001PHP\u3001DECT\u3001IS\u201454\u3001IS\u201495\u7B49\uFF0C\u8FD9\u4E5F\u662F\u5B83\u5177\u6709\u5438\u5F15\u529B\u7684\u4E00\u4E2A\u91CD\u8981\u539F\u56E0\u3002"@zh . "El acceso m\u00FAltiple por divisi\u00F3n de espacio (SDMA, del ingl\u00E9s Space Division Multiple Access) permite la multiplexaci\u00F3n de las comunicaciones de varios usuarios que utilizan la misma zona espectral simult\u00E1neamente. Es una t\u00E9cnica utilizada en comunicaciones inal\u00E1mbricas. Para evitar la interferencia de dichas comunicaciones, se utilizan sistemas de antenas directivas que permiten establecer diferentes canales radio independientes. Es habitual utilizar m\u00FAltiples antenas en transmisi\u00F3n y recepci\u00F3n. Por este motivo, SDMA se asimila a los sistemas MU-MIMO (del ingl\u00E9s Multi-user MIMO) y esta segunda denominaci\u00F3n se ha convertido en la dominante."@es . . . "SDMA"@pl . . . . "Space-division multiple access"@en . "El acceso m\u00FAltiple por divisi\u00F3n de espacio (SDMA, del ingl\u00E9s Space Division Multiple Access) permite la multiplexaci\u00F3n de las comunicaciones de varios usuarios que utilizan la misma zona espectral simult\u00E1neamente. Es una t\u00E9cnica utilizada en comunicaciones inal\u00E1mbricas. Para evitar la interferencia de dichas comunicaciones, se utilizan sistemas de antenas directivas que permiten establecer diferentes canales radio independientes. Es habitual utilizar m\u00FAltiples antenas en transmisi\u00F3n y recepci\u00F3n. Por este motivo, SDMA se asimila a los sistemas MU-MIMO (del ingl\u00E9s Multi-user MIMO) y esta segunda denominaci\u00F3n se ha convertido en la dominante. La utilizaci\u00F3n de SDMA permite mejorar la eficiencia espectral por unidad de superficie de los sistemas de telefon\u00EDa m\u00F3vil. Es decir, es posible transmitir m\u00E1s bits/s por cada hercio de ancho de banda utilizado y en cada km\u00B2 de superficie cubierta. Antes de la llegada de los sistemas de telefon\u00EDa m\u00F3vil 5G, la estrategia habitual para mejorar dicha eficiencia era incrementar la densidad de estaciones base. Sin embargo, SDMA/MU-MIMO se considera una tecnolog\u00EDa clave para los sistemas 5G. Especialmente, los sistemas con un n\u00FAmero masivo de antenas."@es . "Lo space division multiple access, o SDMA (in italiano accesso multiplo a suddivisione di spazio ) \u00E8 una tecnica di multiplazione della trasmissione a radiofrequenza, che consente di utilizzare la stessa porzione dello spettro elettromagnetico per inviare pi\u00F9 di un flusso dati sfruttando una distribuzione asimmetrica delle onde radio, ottenuta ad esempio utilizzando antenne direzionali. Il termine SDMA \u00E8 poi utilizzato per estensione per indicare un insiemi di protocolli radio di uso nell'ambito delle telecomunicazioni satellitari che utilizzano tra l'altro anche la tecnica space division multiple access."@it . . . . . "\u7A7A\u5206\u591A\u5740\uFF08\u82F1\u8A9E\uFF1ASpace-division multiple access\uFF0C\u7E2E\u5BEB\u70BA SDMA\uFF09\u662F\u4E00\u79CD\u65B0\u53D1\u5C55\u7684\u591A\u5740\u6280\u672F\uFF0C\u5B83\u5728\u65E0\u7EBF\u591A\u5740\u901A\u4FE1\u7CFB\u7EDF\u4E2D\u53EF\u589E\u52A0\u57FA\u7AD9\u8986\u76D6\u8303\u56F4\uFF0C\u4ECE\u800C\u964D\u4F4E\u7F51\u7EDC\u6210\u672C\u3002\u964D\u4F4E\u6765\u81EA\u5176\u5B83\u7CFB\u7EDF\u548C\u5176\u5B83\u7528\u6237\u7684\u5E72\u6270\uFF0C\u63D0\u9AD8\u7CFB\u7EDF\u5BB9\u91CF\uFF0C\u63D0\u9AD8\u9891\u7387\u5229\u7528\u7387\u3002 \u5728\u4F20\u7EDF\u7684\u8702\u7A9D\u79FB\u52A8\u7F51\u7EDC\u7CFB\u7EDF\u4E2D\uFF0C\u57FA\u7AD9\u5728\u5404\u4E2A\u65B9\u5411\u8F90\u5C04\u4FE1\u53F7\u4EE5\u63D0\u4F9B\u533A\u57DF\u65E0\u7EBF\u8986\u76D6\u3002\u8FD9\u5C06\u5728\u6CA1\u6709\u79FB\u52A8\u5355\u5143\u7684\u4F4D\u7F6E\u4E0A\u6D6A\u8D39\u529F\u7387\uFF0C\u5E76\u5BF9\u76F8\u90BB\u5C0F\u533A\uFF08\u4F7F\u7528\u76F8\u540C\u9891\u7387\uFF0C\u79F0\u4E3A\u5171\u4FE1\u9053\u5355\u5143\uFF09\u9020\u6210\u5E72\u6270\u3002\u540C\u6837\uFF0C\u5728\u63A5\u6536\u7AEF\uFF0C\u5929\u7EBF\u63A5\u6536\u5305\u62EC\u566A\u58F0\u548C\u5E72\u6270\u4FE1\u53F7\u5728\u5185\u7684\u6240\u6709\u65B9\u5411\u7684\u4FE1\u53F7\u3002\u901A\u8FC7\u4F7F\u7528\u667A\u80FD\u5929\u7EBF\u6280\u672F\uFF0C\u7A7A\u5206\u591A\u5740\u6280\u672F\u63D0\u4F9B\u4E86\u6709\u5438\u5F15\u529B\u7684\u6027\u80FD\u589E\u5F3A\u3002\u57FA\u7AD9\u5728\u53D1\u9001\u4E2D\u7684\u8F90\u5C04\u65B9\u5411\u9002\u5408\u4E8E\u7528\u6237\uFF0C\u7528\u6237\u53EF\u83B7\u5F97\u8BE5\u65B9\u5411\u4E0A\u7684\u6700\u9AD8\u589E\u76CA\u3002\u53E6\u5916\uFF0CSDMA\u4E0E\u4EFB\u4F55\u8C03\u5236\u65B9\u5F0F\u3001\u5E26\u5BBD\u6216\u9891\u6BB5\u517C\u5BB9\uFF0C\u5305\u62ECAMPS\u3001GSM\u3001PHP\u3001DECT\u3001IS\u201454\u3001IS\u201495\u7B49\uFF0C\u8FD9\u4E5F\u662F\u5B83\u5177\u6709\u5438\u5F15\u529B\u7684\u4E00\u4E2A\u91CD\u8981\u539F\u56E0\u3002"@zh . . "SDMA \u2014 Space Division Multiple Access. Kolejna metoda wieloost\u0119pu po TDMA, CDMA, FDMA. Dzia\u0142anie metody SDMA opiera si\u0119 na zastosowaniu matryc antenowych, kt\u00F3re dzi\u0119ki sterowaniu elektronicznemu s\u0105 w stanie syntetyzowa\u0107 silnie kierunkowe charakterystyki antenowe."@pl . . . . . . . "Acceso m\u00FAltiple por divisi\u00F3n de espacio"@es . . "Acc\u00E9s m\u00FAltiple per divisi\u00F3 d'espai"@ca . . . . "Lo space division multiple access, o SDMA (in italiano accesso multiplo a suddivisione di spazio ) \u00E8 una tecnica di multiplazione della trasmissione a radiofrequenza, che consente di utilizzare la stessa porzione dello spettro elettromagnetico per inviare pi\u00F9 di un flusso dati sfruttando una distribuzione asimmetrica delle onde radio, ottenuta ad esempio utilizzando antenne direzionali."@it . "1070078442"^^ . "4320"^^ . "Space division multiple access"@it . "SDMA \u2014 Space Division Multiple Access. Kolejna metoda wieloost\u0119pu po TDMA, CDMA, FDMA. Dzia\u0142anie metody SDMA opiera si\u0119 na zastosowaniu matryc antenowych, kt\u00F3re dzi\u0119ki sterowaniu elektronicznemu s\u0105 w stanie syntetyzowa\u0107 silnie kierunkowe charakterystyki antenowe."@pl . . . . . . . "Space-division multiple access (SDMA) is a channel access method based on creating parallel spatial pipes (focused signal beams) using advanced antenna technology next to higher capacity pipes through spatial multiplexing and/or diversity, by which it is able to offer superior performance in radio multiple access communication systems (where multiple users may need to use the communication media simultaneously). In traditional mobile cellular network systems, the base station has no information on the position of the mobile units within the cell and radiates the signal in all directions within the cell in order to provide radio coverage. This method results in wasting power on transmissions when there are no mobile units to reach, in addition to causing interference for adjacent cells usin"@en . . . "Acc\u00E9s m\u00FAltiple per divisi\u00F3 d'espai (SDMA, acr\u00F2nim de Spatial Division Multiple Access) i \u00E9s un MIMO (Mutiple-Input and Multiple-Output). \u00C9s una arquitectura sense cables basada en m\u00FAltiples antenes i adequada per a comunicacions m\u00F2bils. Permet l'acc\u00E9s al canal identificant la localitzaci\u00F3 de l'usuari i establint una connexi\u00F3 directa entre la divisi\u00F3 de l'amplada de banda de la xarxa i la localitzaci\u00F3 espacial trobada. Aquesta t\u00E8cnica es pot integrar junt amb altres t\u00E8cniques d'acc\u00E9s convencional com FDMA, TDMA i CDMA."@ca . . "\u7A7A\u5206\u591A\u5740"@zh . . . . . "September 2018"@en . . . . "This is why one may be safer"@en . .