It is proved that the normal suite of the TCP/IP protocols works well when it is used in terrestrial networks transporting real time applications. The situation is quite different when wireless networks are used for the same services; their susceptibility to errors, losses as well as the existing delay cause a degradation in the overall performance. Due to the existing demand to interconnect terrestrial networks with satellite communications using DVB-S2/DVB-RCS standards, the satellite link poses a challenge which is to overcome the problems mentioned when applications as Voice Over IP (VOIP) are considered.In the same context, cross-layer mechanisms are being used successfully in Ad-hoc networks. They propose interactions between layers different from the traditional ones in the protocol stack. These mechanisms provide a fast and better way to exchange parameters, drawing as a result a good option to improve the performance in wireless networks.This work proposes an innovative algorithm to adapt dynamically the coding for VOIP applications over satellite using a cross layer interaction between the application and network layers in order to improve the throughput and the perceived quality. This interaction with the network layer indirectly takes into account the state of the MAC and physical layers.
ResumenEn el presente trabajo se presenta una nueva arquitectura para detección de sistemas híbridos MIMO en canales con desvanecimiento Rayleigh. El esquema propuesta consiste de un módulo Alamouti más antenas operando con diversidad espacial en el transmisor. El receptor propuesto está basado en el algoritmo Sorted QR decomposition (SQRD) presentado en (Wubben et al., 2001). Nuestra propuesta disminuye significativamente la complejidad manteniendo las ventajas del esquema SQRD, obteniéndose una considerable ganancia en términos de Tasa deError de Bit (BER), sacrificando una disminución en la tasa de trasmisión. AbstractIn this work, a novel architecture for detection of Hybrid MIMO Systems over Rayleigh fading channels is presented. The Hybrid MIMO scheme consists of one Alamouti space-time block code unit, plus antennas operating as layers of V-BLAST in the transmitter. The proposed receiver is based on the algorithm Sorted QR decomposition (SQRD) presented in (Wubben et al., 2001). This proposal reduces significantly the complexity while maintaining the advantages of the SQRD scheme, obtaining a considerable gain in performance in terms of bit error rate (BER) at the expense of decreasing data rate.
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