Please use this identifier to cite or link to this item:
http://hdl.handle.net/11144/3133
Title: | An iterative decision directed channel estimation for multi-user MIMO systems |
Authors: | Gaspar, Guilherme Ferreira, Afonso Carvalho, Paulo Montezuma Silva, Mário Marques da Dinis, Rui |
Keywords: | massive MIMO Channel state information decision directed channel estimation pilot contamination |
Issue Date: | May-2017 |
Abstract: | The massive use of transmit and receive antennas with perfect channel state information (CSI) in massive MIMO systems (Multiple Input Multiple Output) can lead array power gain increments proportional to the number of antennas. For CSI estimation pilots can be used, but in multi-user scenarios pilot contamination may occur which may compromise estimation, even when are used orthogonal sequences such as Chu sequences. In such conditions even a precoding does not cancel interference among users and the system performance can be compromised. It is shown that a decision directed scheme based on a iterative block frequency domain equalizer can be used to compensate the pilot contamination impact on channel estimation without sacrificing the complexity. Moreover, when the coherence time spans multiple data blocks, these most accurate channel estimates can be used to precod the subsequent blocks and thereby improve system performance. It is also presented a set of performance results that sustain our assumption. |
Peer Reviewed: | yes |
URI: | http://hdl.handle.net/11144/3133 |
Publisher Version: | https://www.it.pt/Publications/PaperConference/28546 |
Appears in Collections: | DCT- Comunicações em conferências |
Files in This Item:
File | Description | Size | Format | |
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MONTEZUMA - Paper_chanest_mimovf.pdf | 642,64 kB | Adobe PDF | View/Open |
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