An experimental evaluation of broadband spatial IA for uncoordinated MIMO-OFDM systems

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URI: http://hdl.handle.net/10902/9514
ISBN: 978-1-4799-8058-1
ISBN: 978-1-4799-8059-8
ISBN: 978-1-4799-8057-4
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Autoría
Fanjul Fernández, Jacobo; Lameiro Gutiérrez, ChristianAutoridad Unican; Santamaría Caballero, Luis IgnacioAutoridad Unican; García Naya, José Antonio; Castedo Ribas, Luis
Fecha
2015
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© 2015 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
Publicado en
IEEE International Conference on Digital Signal Processing (DSP), Singapore, 2015, 570-574
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IEEE
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Palabras clave
Interference alignment
OFDM
WLAN systems
Interference channel
MIMO testbed
Resumen/Abstract
In this paper we present an experimental study on the performance of spatial Interference Alignment (IA) in broadband indoor wireless local area network scenarios that use Orthogonal Frequency Division Multiplexing (OFDM) according to the IEEE 802.11a physical-layer specifications. Experiments have been carried out using a wireless network testbed made up of six nodes equipped with Multiple-Input Multiple-Output (MIMO) radio interfaces. This setup allows the implementation of a 3-user MIMO interference channel. We have implemented different IA decoding schemes that operate either before or after the Fast Fourier Transform block. IA has been experimentally evaluated comparing both approaches to analyze its performance in synchronous and asynchronous transmissions. Our results indicate that spatial IA performs satisfactorily in practical broadband indoor scenarios in which wireless channels often exhibit relatively large coherence times.
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