Link adaptation (original) (raw)

About DBpedia

適応変調（てきおうへんちょう）は、デジタル通信における送信方式であり、周波数帯（チャンネル）に従って送信モードを適応させる。周波数帯の状態により、送信機はコンステレーションサイズ、コードレート、出力の一つ以上を適応させる。

Property Value
dbo:abstract L'adaptive modulation and coding (AMC) est une technique de modulation/codage adaptative de l'information, utilisée notamment dans les transmissions radio, sur les réseaux de téléphonie mobile WiMAX, UMTS (HSDPA), LTE et depuis 2012 sur les faisceaux hertziens. Elle consiste à adapter les rendements de codage et les constellations utilisés en fonction de la qualité du signal. Par exemple, si les constellations disponibles sont la QPSK et la16-QAM, dans le cas où le canal est marqué comme bon, on utilisera la constellation 16-QAM, qui offre un meilleur débit mais une plus faible robustesse. Par contre, si le canal est marqué comme dégradé, on utilisera la constellation QPSK, permettant un débit plus faible, mais plus robuste (moins sensible aux interférences). Dans les faisceaux hertziens cette technique est associée à des mécanismes de QoS (Quality of Service) d'Ethernet. Lorsque la transmission dans l'air se dégrade, la constellation bascule à un ordre inférieur, au détriment de la bande passante. Les flux Ethernet sont alors écrêtés en commençant par les flux les moins prioritaires. (fr) La adaptación de enlace o codificación y modulación adaptativa (ACM, siglas de Adaptive Coding and Modulation), es un término utilizado en las comunicaciones inalámbricas para denotar la adecuación de la modulación, la codificación y otros parámetros del protócolo y de la señal a las condiciones en el (por ejemplo, la pérdida de propagación,​ la interferencia debido a señales provenientes de otros transmisores, la sensibilidad del receptor, el margen disponible de potencia del transmisor, etc.). Por ejemplo, EDGE utiliza un algoritmo de adaptación de la velocidad que adecua el (MCS que es la abreviatura de Modulation and Coding Scheme)​ de acuerdo con la calidad del canal de radio y, por lo tanto, la velocidad de bits y la robustez de la transmisión de datos. El proceso de adaptación del enlace es dinámico y los parámetros de la señal y el protocolo cambian a medida que cambian las condiciones del enlace de radio - por ejemplo, en High-Speed Downlink Packet Access (HSDPA) en el Sistema Universal de Telecomunicaciones Móviles (UMTS), esto tiene lugar cada 2 ms. (es) Link adaptation, comprising adaptive coding and modulation (ACM) and others (such as Power Control), is a term used in wireless communications to denote the matching of the modulation, coding and other signal and protocol parameters to the conditions on the (e.g. the pathloss, the interference due to signals coming from other transmitters, the sensitivity of the receiver, the available transmitter power margin, etc.). For example, WiMAX uses a rate adaptation algorithm that adapts the modulation and coding scheme (MCS) according to the quality of the radio channel, and thus the bit rate and robustness of data transmission. The process of link adaptation is a dynamic one and the signal and protocol parameters change as the radio link conditions change—for example in High-Speed Downlink Packet Access (HSDPA) in Universal Mobile Telecommunications System (UMTS) this can take place every 2 ms. Adaptive modulation systems invariably require some channel state information at the transmitter. This could be acquired in time-division duplex systems by assuming the channel from the transmitter to the receiver is approximately the same as the channel from the receiver to the transmitter. Alternatively, the channel knowledge can also be directly measured at the receiver, and fed back to the transmitter. Adaptive modulation systems improve rate of transmission, and/or bit error rates, by exploiting the channel state information that is present at the transmitter. Especially over fading channels which model wireless propagation environments, adaptive modulation systems exhibit great performance enhancements compared to systems that do not exploit channel knowledge at the transmitter. (en) 適応変調（てきおうへんちょう）は、デジタル通信における送信方式であり、周波数帯（チャンネル）に従って送信モードを適応させる。周波数帯の状態により、送信機はコンステレーションサイズ、コードレート、出力の一つ以上を適応させる。 (ja) 自適應调制和編碼（Adaptive modulation and coding；AMC）是根據終端（UE）和Node-B提供的訊息，改變調制和編碼的格式，使其適應在系統限制範圍內和通道條件。 HSDPA實現AMC的方法： * 選擇调制类型（modulation type），利用相位偏移调制（QPSK）正交幅度调制（16QAM）來清除通道。 * 選擇前向糾錯編碼（FEC） (zh)
dbo:wikiPageID 2321017 (xsd:integer)
dbo:wikiPageLength 4819 (xsd:nonNegativeInteger)
dbo:wikiPageRevisionID 1100051421 (xsd:integer)
dbo:wikiPageWikiLink dbr:Punctured_code dbr:QPSK dbr:Quadrature_amplitude_modulation dbr:Modulation dbr:Universal_Mobile_Telecommunications_System dbr:Interference_(communication) dbr:Communications_protocol dbr:Receiver_(Information_Theory) dbr:Cliff_effect dbr:Time-division_duplex dbr:WiMAX dbc:Radio_resource_management dbr:Forward_error_correction dbr:Channel_coding dbr:Radio_resource_management dbr:Retransmission_(data_networks) dbr:High-Speed_Downlink_Packet_Access dbr:Hybrid_automatic_repeat_request dbc:Quantized_radio_modulation_modes dbr:Bit_error_rate dbr:Bit_rate dbr:Code_rate dbr:Hierarchical_modulation dbr:Wireless dbr:Fading_channel dbr:Channel_state_information dbr:Spectral_efficiency dbr:Wireless_communication dbr:Signalling_(telecommunication) dbr:Pathloss dbr:Radio_link
dbp:wikiPageUsesTemplate dbt:Reflist dbt:Section_link
dct:subject dbc:Radio_resource_management dbc:Quantized_radio_modulation_modes
gold:hypernym dbr:Term
rdf:type yago:Abstraction100002137 yago:Attribute100024264 yago:Manner104928903 yago:Property104916342 yago:WikicatQuantizedRadioModulationModes
rdfs:comment 適応変調（てきおうへんちょう）は、デジタル通信における送信方式であり、周波数帯（チャンネル）に従って送信モードを適応させる。周波数帯の状態により、送信機はコンステレーションサイズ、コードレート、出力の一つ以上を適応させる。 (ja) 自適應调制和編碼（Adaptive modulation and coding；AMC）是根據終端（UE）和Node-B提供的訊息，改變調制和編碼的格式，使其適應在系統限制範圍內和通道條件。 HSDPA實現AMC的方法： * 選擇调制类型（modulation type），利用相位偏移调制（QPSK）正交幅度调制（16QAM）來清除通道。 * 選擇前向糾錯編碼（FEC） (zh) Link adaptation, comprising adaptive coding and modulation (ACM) and others (such as Power Control), is a term used in wireless communications to denote the matching of the modulation, coding and other signal and protocol parameters to the conditions on the (e.g. the pathloss, the interference due to signals coming from other transmitters, the sensitivity of the receiver, the available transmitter power margin, etc.). For example, WiMAX uses a rate adaptation algorithm that adapts the modulation and coding scheme (MCS) according to the quality of the radio channel, and thus the bit rate and robustness of data transmission. The process of link adaptation is a dynamic one and the signal and protocol parameters change as the radio link conditions change—for example in High-Speed Downlink Pac (en) La adaptación de enlace o codificación y modulación adaptativa (ACM, siglas de Adaptive Coding and Modulation), es un término utilizado en las comunicaciones inalámbricas para denotar la adecuación de la modulación, la codificación y otros parámetros del protócolo y de la señal a las condiciones en el (por ejemplo, la pérdida de propagación,​ la interferencia debido a señales provenientes de otros transmisores, la sensibilidad del receptor, el margen disponible de potencia del transmisor, etc.). (es) L'adaptive modulation and coding (AMC) est une technique de modulation/codage adaptative de l'information, utilisée notamment dans les transmissions radio, sur les réseaux de téléphonie mobile WiMAX, UMTS (HSDPA), LTE et depuis 2012 sur les faisceaux hertziens. Elle consiste à adapter les rendements de codage et les constellations utilisés en fonction de la qualité du signal. (fr)
rdfs:label Adaptación de enlace (es) Adaptative modulation and coding (fr) Link adaptation (en) 適応変調 (ja) 自適應調變和編碼 (zh)
owl:sameAs freebase:Link adaptation yago-res:Link adaptation wikidata:Link adaptation dbpedia-es:Link adaptation dbpedia-fr:Link adaptation dbpedia-ja:Link adaptation dbpedia-zh:Link adaptation https://global.dbpedia.org/id/2Y3Pf
prov:wasDerivedFrom wikipedia-en:Link_adaptation?oldid=1100051421&ns=0
foaf:isPrimaryTopicOf wikipedia-en:Link_adaptation
is dbo:wikiPageDisambiguates of dbr:Adaptation_(disambiguation)
is dbo:wikiPageRedirects of dbr:Adaptive_coding_and_modulation dbr:Adaptive_modulation_and_coding dbr:Modulation_and_coding_scheme dbr:Adaptive_modulation dbr:Adaptive_modulation_and_error_coding dbr:Adaptive_modulation_scheme dbr:Modulation_and_Coding_Scheme
is dbo:wikiPageWikiLink of dbr:List_of_algebraic_coding_theory_topics dbr:DVB-S2 dbr:DVB-T2 dbr:E-VSB dbr:Adaptive_coding_and_modulation dbr:Adaptive_modulation_and_coding dbr:Proportional-fair_scheduling dbr:Error_detection_and_correction dbr:Generic_Stream_Encapsulation dbr:Cliff_effect dbr:Transmission_Time_Interval dbr:Maximum_throughput_scheduling dbr:Active_cable dbr:4G dbr:Adaptive_Multi-Rate_audio_codec dbr:Dynamic_spectrum_management dbr:Radio_resource_management dbr:Round-robin_scheduling dbr:Adaptation_(disambiguation) dbr:Bit_rate dbr:Hierarchical_modulation dbr:High_Speed_Packet_Access dbr:Modulation_and_coding_scheme dbr:User-in-the-loop dbr:IMT_Advanced dbr:Roofnet dbr:Spectral_efficiency dbr:Adaptive_modulation dbr:Adaptive_modulation_and_error_coding dbr:Adaptive_modulation_scheme dbr:Modulation_and_Coding_Scheme
is foaf:primaryTopic of wikipedia-en:Link_adaptation