Analysis of Multi-User Uplink Channel with MIMO
The increasing number of connected users as well as the availability of new services and mobile applications drive the need for higher data rates. In order to fulfill such expectations different strategies such as spatial multiplexing have been introduced. This thesis is centered on the Multi-User U...
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| Tipo de recurso: | tesis de maestría |
| Fecha de publicación: | 2023 |
| País: | España |
| Institución: | Universitat Politècnica de Catalunya (UPC) |
| Repositorio: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglés |
| OAI Identifier: | oai:upcommons.upc.edu:2117/387514 |
| Acceso en línea: | https://hdl.handle.net/2117/387514 |
| Access Level: | acceso abierto |
| Palabra clave: | MIMO systems Beamforming MIMO communications multi-user uplink channel multiple access channel MMSE beamformer Sistemes MIMO Àrees temàtiques de la UPC::Enginyeria de la telecomunicació::Telemàtica i xarxes d'ordinadors |
| Sumario: | The increasing number of connected users as well as the availability of new services and mobile applications drive the need for higher data rates. In order to fulfill such expectations different strategies such as spatial multiplexing have been introduced. This thesis is centered on the Multi-User Uplink Channel where different users transmit to a single base station with multiple antennas. The purpose of this thesis is to design the transmitter and the receiver architectures so that the maximum sum rate of a Multi-User Uplink Channel reaches the capacity for single and multi-antenna users. In the literature there is a lack of practical implementations and not many studies exploit the multi-antenna user scenario. It is important to properly characterize the capacity region and define practical implementation schemes on the uplink direction to design the architecture for the Multi-User Downlink Channel also referred as the Broadcast Channel, which is a more complex problem based on the uplink solution. The design of the optimal transmitter is motivated by the analysis of capacity first for the single user scenario with Multi Input Multi Output Peer-to-Peer (MIMO P2P) communica- tions followed by the Multi-User scenario for single and multi-antenna users. At the receiver three types of beamformers are analyzed and compared: Zero Forcing, QR and Minimum Mean Squared Error beamformer. Results for the Bit Error Rate performance and maximum sum rate for the different receivers are provided. The thesis results show that the optimal architecture for the Multi-User Uplink with multi- antenna users that achieves capacity is the combination of the optimal MIMO P2P design, based on the Singular Value Decomposition of the channel matrix and the Water Filling power allocation. For the receiver part the Minimum Mean Squared Error beamformer is proven to achieve capacity. Channel State Information is needed at the transmitter and receiver, therefore a channel estimation algorithm is provided based on orthogonal sequences and is proven to deliver good Bit Error Rate results. |
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