A Family of Hybrid Space-Time Codes for MIMO Wireless Communications

 

M. Bazdresch*¹, J. Cortez², O. Longoria-Gándara¹, R. Parra-Michel³

 

¹ ITESO, Periférico Sur, Manuel Gómez Morín, 8585 Tlaquepaque, Jalisco, México. * miguelb@ieee.org.

² ITSON, Antonio Caso, S/N, C.P. 85130, Cd. Obregon, Sonora, México.

³ CINVESTAV del IPN, Av. del Bosque, 1145, C.P. 45019, Zapopan, Jalisco, México.

 

Abstract

Hybrid MIMO space-time codes combine the benefits of spatial multiplexing with diversity gain to achieve both high spectral efficiency and link reliability. In this paper, we present a family of hybrid codes, known as LD STBC-VBLAST codes, along with a receiver architecture suitable for low-complexity hardware implementation. We show that, under Rayleigh fading, the performance of LD STBC-VBLAST codes is superior to other recently proposed hybrid codes. We also present a technique to derive, from a given propagation scenario, spatially correlated MIMO channel models adequate for space-time coding performance analysis. Using this technique, we evaluate the performance of LD STBC-VBLAST codes under several correlated channels.

Keywords: Linear dispersion codes, hybrid space-time codes, correlated MIMO channel, MIMO systems, sorted QR decomposition.

 

Resumen

Los códigos espacio-temporales híbridos para sistemas MIMO combinan las ventajas del multiplexaje espacial con la ganancia en diversidad, para lograr, al mismo tiempo, una alta eficiencia espectral y una baja tasa de error. En este artículo, presentamos una familia de códigos híbridos, conocida como códigos LD STBC-VBLAST, junto con una arquitectura para un receptor que puede ser implementada en hardware y presenta baja complejidad. Mostramos que, cuando el canal inalámbrico es Rayleigh, el rendimiento de los códigos LD STBC-VBLAST es mayor que el de otros códigos híbridos que han sido propuestos recientemente. También presentamos una técnica para derivar, a partir de un escenario de propagación, un canal MIMO con correlación espacial que es adecuado para simular y evaluar el rendimiento de un código espacio-temporal. Utilizando esta técnica, evaluamos el rendimiento de los códigos LD STBC-VBLAST en varios canales correlacionados.

 

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Acknowledgements

This work was supported by PROMEP under research grant 103.5/10/8573.

 

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