{"id":{"repo_id":"aachen","oai_identifier":"oai:publications.rwth-aachen.de:62217"},"canonical_url":"https://search.dev.ndltd.org/etd/aachen/oai:publications.rwth-aachen.de:62217","repository":{"repo_id":"aachen","name":"RWTH Aachen University","base_url":"https://publications.rwth-aachen.de/oai2d"},"display":{"title":"Antennenkonfigurationen und Kalibrierungskonzepte für die Realisierung reziproker Mehrantennensysteme","abstract":"It is expected that wireless communication systems demand data rates up to 1 Gb/s in the near future. This technological challenge can be met by the further increase of the spectral efficiency or by the exploitation of previously unused frequency bands in the micro- or millimeterwave range. For that purpose multiple antenna techniques with array antennas at the transmitting and receiving side (MIMO systems) are the key technology. These techniques enable the additional use of spatial diversity and the implementation of spatial multiple access respectively of spatial multiplexing: The utilization of spatial diversity increases the transmission quality and hence the coverage for given bandwidth and transmission power. On the other hand the spatial multiplexing enables the use of higher data rates for fixed bandwidth and power. Both, the investigation of the information theory for multiple antenna and the development of signal processing algorithms, require the knowledge and modeling of the radio channel, which is influenced by the used antenna arrangements and is affected by transceiver impairments in real systems. In this dissertation the description of antenna configurations with respect to antenna polarization and antenna coupling is elaborated at first. Furthermore different antenna configurations are evaluated in terms of the obtainable channel capacity. It is figured out that the application of dual-polarized antennas is advantageous in particular for compact antenna arrangements. Whereas the use of small antenna arrays consisting of equal elements can decrease channel capacity strongly. In the next step, the description of the radio channel is extended by modeling the linear impairments of the transceiver frontends like matching and unequal gains. The resulting entire system model allows the implementation of realistic link level simulations for different wireless transmission techniques. Here only linear receive and transmit filters are analyzed. The suggested transmit filters require perfect channel knowledge at the transmitter, which is obtained in a TDD system by the utilization of the assumed reciprocity of the radio channel: For a reciprocal system the transmit and the receive channel are the same. To achieve reciprocity for the entire channel, including antennas and transceivers, a calibration of the system is necessary. Therefore different calibration methods are developed and evaluated. At least the calibration of that side, which uses the transmit filter, is required. It is shown, that on realistic conditions the calibration can be performed only for systems applying more transmit than receive antennas. The work concludes with the presentation of high frequency circuits implementing the proposed calibration methods.","abstract_html":"It is expected that wireless communication systems demand data rates up to 1 Gb/s in the near future. This technological challenge can be met by the further increase of the spectral efficiency or by the exploitation of previously unused frequency bands in the micro- or millimeterwave range. For that purpose multiple antenna techniques with array antennas at the transmitting and receiving side (MIMO systems) are the key technology. These techniques enable the additional use of spatial diversity and the implementation of spatial multiple access respectively of spatial multiplexing: The utilization of spatial diversity increases the transmission quality and hence the coverage for given bandwidth and transmission power. On the other hand the spatial multiplexing enables the use of higher data rates for fixed bandwidth and power. Both, the investigation of the information theory for multiple antenna and the development of signal processing algorithms, require the knowledge and modeling of the radio channel, which is influenced by the used antenna arrangements and is affected by transceiver impairments in real systems. In this dissertation the description of antenna configurations with respect to antenna polarization and antenna coupling is elaborated at first. Furthermore different antenna configurations are evaluated in terms of the obtainable channel capacity. It is figured out that the application of dual-polarized antennas is advantageous in particular for compact antenna arrangements. Whereas the use of small antenna arrays consisting of equal elements can decrease channel capacity strongly. In the next step, the description of the radio channel is extended by modeling the linear impairments of the transceiver frontends like matching and unequal gains. The resulting entire system model allows the implementation of realistic link level simulations for different wireless transmission techniques. Here only linear receive and transmit filters are analyzed. The suggested transmit filters require perfect channel knowledge at the transmitter, which is obtained in a TDD system by the utilization of the assumed reciprocity of the radio channel: For a reciprocal system the transmit and the receive channel are the same. To achieve reciprocity for the entire channel, including antennas and transceivers, a calibration of the system is necessary. Therefore different calibration methods are developed and evaluated. At least the calibration of that side, which uses the transmit filter, is required. It is shown, that on realistic conditions the calibration can be performed only for systems applying more transmit than receive antennas. The work concludes with the presentation of high frequency circuits implementing the proposed calibration methods.","abstract_has_math":false,"creators":["Keusgen, Wilhelm"],"institution":"Publikationsserver der RWTH Aachen University","degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":["Rembold, Bernhard"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2006,"date_issued":"2006","date_published":"2006","updated_at":"2026-07-30T19:43:19Z","subjects":["info:eu-repo/classification/ddc/620","Ingenieurwissenschaften","Antennengruppe","MIMO","Reziprozität","Kalibrierung","Funkkanal","Systemmodell","Reciprocity","Calibration","Radio Channel","System Model"],"languages":["ger"],"rights":["info:eu-repo/semantics/openAccess"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["https://publications.rwth-aachen.de/search?p=id:%22RWTH-CONV-123799%22"],"render_values":[{"text":"https://publications.rwth-aachen.de/search?p=id:%22RWTH-CONV-123799%22","href":"https://publications.rwth-aachen.de/search?p=id:%22RWTH-CONV-123799%22","code":true}]}]},"links":{"outbound_url":"https://publications.rwth-aachen.de/record/62217","outbound_label":"Repository record","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Rembold, Bernhard"]},{"key":"dc:creator","label":"Author","values":["Keusgen, Wilhelm"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:coverage","label":"Dc Coverage","values":["DE"]},{"key":"dc:date","label":"Dc Date","values":["2006"]},{"key":"dc:publisher","label":"Institution","values":["Publikationsserver der RWTH Aachen University"]},{"key":"dc:relation","label":"Dc Relation","values":["info:eu-repo/semantics/altIdentifier/urn/urn:nbn:de:hbz:82-opus-13705"]},{"key":"dc:type","label":"Dc Type","values":["info:eu-repo/semantics/doctoralThesis","info:eu-repo/semantics/publishedVersion"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["info:eu-repo/classification/ddc/620","Ingenieurwissenschaften","Antennengruppe","MIMO","Reziprozität","Kalibrierung","Funkkanal","Systemmodell","Reciprocity","Calibration","Radio Channel","System Model"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["ger"]},{"key":"dc:rights","label":"Dc Rights","values":["info:eu-repo/semantics/openAccess"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://publications.rwth-aachen.de/record/62217","https://publications.rwth-aachen.de/search?p=id:%22RWTH-CONV-123799%22"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["It is expected that wireless communication systems demand data rates up to 1 Gb/s in the near future. This technological challenge can be met by the further increase of the spectral efficiency or by the exploitation of previously unused frequency bands in the micro- or millimeterwave range. For that purpose multiple antenna techniques with array antennas at the transmitting and receiving side (MIMO systems) are the key technology. These techniques enable the additional use of spatial diversity and the implementation of spatial multiple access respectively of spatial multiplexing: The utilization of spatial diversity increases the transmission quality and hence the coverage for given bandwidth and transmission power. On the other hand the spatial multiplexing enables the use of higher data rates for fixed bandwidth and power. Both, the investigation of the information theory for multiple antenna and the development of signal processing algorithms, require the knowledge and modeling of the radio channel, which is influenced by the used antenna arrangements and is affected by transceiver impairments in real systems. In this dissertation the description of antenna configurations with respect to antenna polarization and antenna coupling is elaborated at first. Furthermore different antenna configurations are evaluated in terms of the obtainable channel capacity. It is figured out that the application of dual-polarized antennas is advantageous in particular for compact antenna arrangements. Whereas the use of small antenna arrays consisting of equal elements can decrease channel capacity strongly. In the next step, the description of the radio channel is extended by modeling the linear impairments of the transceiver frontends like matching and unequal gains. The resulting entire system model allows the implementation of realistic link level simulations for different wireless transmission techniques. Here only linear receive and transmit filters are analyzed. The suggested transmit filters require perfect channel knowledge at the transmitter, which is obtained in a TDD system by the utilization of the assumed reciprocity of the radio channel: For a reciprocal system the transmit and the receive channel are the same. To achieve reciprocity for the entire channel, including antennas and transceivers, a calibration of the system is necessary. Therefore different calibration methods are developed and evaluated. At least the calibration of that side, which uses the transmit filter, is required. It is shown, that on realistic conditions the calibration can be performed only for systems applying more transmit than receive antennas. The work concludes with the presentation of high frequency circuits implementing the proposed calibration methods."]},{"key":"dc:source","label":"Dc Source","values":["Aachen : Publikationsserver der RWTH Aachen University X, 167 S. : Ill., graph. Darst. (2006). = Aachen, Techn. Hochsch., Diss., 2005"]},{"key":"dc:title","label":"Title","values":["Antennenkonfigurationen und Kalibrierungskonzepte für die Realisierung reziproker Mehrantennensysteme"]}]}],"canonical_facts":{"dc:contributor":["Rembold, Bernhard"],"dc:coverage":["DE"],"dc:creator":["Keusgen, Wilhelm"],"dc:date":["2006"],"dc:description":["It is expected that wireless communication systems demand data rates up to 1 Gb/s in the near future. This technological challenge can be met by the further increase of the spectral efficiency or by the exploitation of previously unused frequency bands in the micro- or millimeterwave range. For that purpose multiple antenna techniques with array antennas at the transmitting and receiving side (MIMO systems) are the key technology. These techniques enable the additional use of spatial diversity and the implementation of spatial multiple access respectively of spatial multiplexing: The utilization of spatial diversity increases the transmission quality and hence the coverage for given bandwidth and transmission power. On the other hand the spatial multiplexing enables the use of higher data rates for fixed bandwidth and power. Both, the investigation of the information theory for multiple antenna and the development of signal processing algorithms, require the knowledge and modeling of the radio channel, which is influenced by the used antenna arrangements and is affected by transceiver impairments in real systems. In this dissertation the description of antenna configurations with respect to antenna polarization and antenna coupling is elaborated at first. Furthermore different antenna configurations are evaluated in terms of the obtainable channel capacity. It is figured out that the application of dual-polarized antennas is advantageous in particular for compact antenna arrangements. Whereas the use of small antenna arrays consisting of equal elements can decrease channel capacity strongly. In the next step, the description of the radio channel is extended by modeling the linear impairments of the transceiver frontends like matching and unequal gains. The resulting entire system model allows the implementation of realistic link level simulations for different wireless transmission techniques. Here only linear receive and transmit filters are analyzed. The suggested transmit filters require perfect channel knowledge at the transmitter, which is obtained in a TDD system by the utilization of the assumed reciprocity of the radio channel: For a reciprocal system the transmit and the receive channel are the same. To achieve reciprocity for the entire channel, including antennas and transceivers, a calibration of the system is necessary. Therefore different calibration methods are developed and evaluated. At least the calibration of that side, which uses the transmit filter, is required. It is shown, that on realistic conditions the calibration can be performed only for systems applying more transmit than receive antennas. The work concludes with the presentation of high frequency circuits implementing the proposed calibration methods."],"dc:identifier":["https://publications.rwth-aachen.de/record/62217","https://publications.rwth-aachen.de/search?p=id:%22RWTH-CONV-123799%22"],"dc:language":["ger"],"dc:publisher":["Publikationsserver der RWTH Aachen University"],"dc:relation":["info:eu-repo/semantics/altIdentifier/urn/urn:nbn:de:hbz:82-opus-13705"],"dc:rights":["info:eu-repo/semantics/openAccess"],"dc:source":["Aachen : Publikationsserver der RWTH Aachen University X, 167 S. : Ill., graph. Darst. (2006). = Aachen, Techn. Hochsch., Diss., 2005"],"dc:subject":["info:eu-repo/classification/ddc/620","Ingenieurwissenschaften","Antennengruppe","MIMO","Reziprozität","Kalibrierung","Funkkanal","Systemmodell","Reciprocity","Calibration","Radio Channel","System Model"],"dc:title":["Antennenkonfigurationen und Kalibrierungskonzepte für die Realisierung reziproker Mehrantennensysteme"],"dc:type":["info:eu-repo/semantics/doctoralThesis","info:eu-repo/semantics/publishedVersion"]},"updated_at":"2026-07-30T19:43:19Z"}