Low-Complexity User Selection for Rate Maximization in MIMO Broadcast Channels with Downlink Beamforming
We present in this work a low-complexity algorithm to solve the sum rate maximization problem in multiuser MIMO broadcast channels with downlink beamforming. Our approach decouples the user selection problem from the resource allocation problem and its main goal is to create a set of quasiorthogona...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2014-01-01
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| Series: | The Scientific World Journal |
| Online Access: | http://dx.doi.org/10.1155/2014/865905 |
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| _version_ | 1832562000452911104 |
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| author | Eduardo Castañeda Adão Silva Ramiro Samano-Robles Atílio Gameiro |
| author_facet | Eduardo Castañeda Adão Silva Ramiro Samano-Robles Atílio Gameiro |
| author_sort | Eduardo Castañeda |
| collection | DOAJ |
| description | We present in this work a low-complexity algorithm to solve the sum rate maximization problem in multiuser MIMO broadcast channels with downlink beamforming. Our approach decouples the user selection problem from the resource allocation problem and its main goal is to create a set of quasiorthogonal users. The proposed algorithm exploits physical metrics of the wireless channels that can be easily computed in such a way that a null space projection power can be approximated efficiently. Based on the derived metrics we present a mathematical model that describes the dynamics of the user selection process which renders the user selection problem into an integer linear program. Numerical results show that our approach is highly efficient to form groups of quasiorthogonal users when compared to previously proposed algorithms in the literature. Our user selection algorithm achieves a large portion of the optimum user selection sum rate (90%) for a moderate number of active users. |
| format | Article |
| id | doaj-art-b18f720daeca40aa9f5b7b8459dc577d |
| institution | Kabale University |
| issn | 2356-6140 1537-744X |
| language | English |
| publishDate | 2014-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | The Scientific World Journal |
| spelling | doaj-art-b18f720daeca40aa9f5b7b8459dc577d2025-02-03T01:23:45ZengWileyThe Scientific World Journal2356-61401537-744X2014-01-01201410.1155/2014/865905865905Low-Complexity User Selection for Rate Maximization in MIMO Broadcast Channels with Downlink BeamformingEduardo Castañeda0Adão Silva1Ramiro Samano-Robles2Atílio Gameiro3Department of Electronics, Telecommunications and Informatics, Aveiro University, Aveiro, PortugalDepartment of Electronics, Telecommunications and Informatics, Aveiro University, Aveiro, PortugalInstituto de Telecomunicações, Campus Universitário de Santiago, P-3810-193 Aveiro, PortugalDepartment of Electronics, Telecommunications and Informatics, Aveiro University, Aveiro, PortugalWe present in this work a low-complexity algorithm to solve the sum rate maximization problem in multiuser MIMO broadcast channels with downlink beamforming. Our approach decouples the user selection problem from the resource allocation problem and its main goal is to create a set of quasiorthogonal users. The proposed algorithm exploits physical metrics of the wireless channels that can be easily computed in such a way that a null space projection power can be approximated efficiently. Based on the derived metrics we present a mathematical model that describes the dynamics of the user selection process which renders the user selection problem into an integer linear program. Numerical results show that our approach is highly efficient to form groups of quasiorthogonal users when compared to previously proposed algorithms in the literature. Our user selection algorithm achieves a large portion of the optimum user selection sum rate (90%) for a moderate number of active users.http://dx.doi.org/10.1155/2014/865905 |
| spellingShingle | Eduardo Castañeda Adão Silva Ramiro Samano-Robles Atílio Gameiro Low-Complexity User Selection for Rate Maximization in MIMO Broadcast Channels with Downlink Beamforming The Scientific World Journal |
| title | Low-Complexity User Selection for Rate Maximization in MIMO Broadcast Channels with Downlink Beamforming |
| title_full | Low-Complexity User Selection for Rate Maximization in MIMO Broadcast Channels with Downlink Beamforming |
| title_fullStr | Low-Complexity User Selection for Rate Maximization in MIMO Broadcast Channels with Downlink Beamforming |
| title_full_unstemmed | Low-Complexity User Selection for Rate Maximization in MIMO Broadcast Channels with Downlink Beamforming |
| title_short | Low-Complexity User Selection for Rate Maximization in MIMO Broadcast Channels with Downlink Beamforming |
| title_sort | low complexity user selection for rate maximization in mimo broadcast channels with downlink beamforming |
| url | http://dx.doi.org/10.1155/2014/865905 |
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