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On the degrees of freedom of the K-user MISO interference channel with imperfect delayed CSIT
Torrellas Socastro, Marc; Agustín de Dios, Adrián; Vidal Manzano, José
Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions; Universitat Politècnica de Catalunya. SPCOM - Grup de Recerca de Processament del Senyal i Comunicacions
This work investigates the degrees of freedom (DoF) of the K-user multiple-input single-output (MISO) interference channel (IC) with imperfect delayed channel state information at the transmitters (dCSIT). For this setting, new DoF inner bounds are provided, and benchmarked with cooperation-based outer bounds. The achievability result is based on a precoding scheme that aligns the interfering received signals through time, exploiting the concept of Retrospective Interference Alignment (RIA). The proposed approach outperforms all previous known schemes. Furthermore, we study the proposed scheme under channel estimation errors (CEE) on the reported dCSIT, and derive a closed-form expression for the achievable DoF with imperfect dCSIT.
Peer Reviewed
Àrees temàtiques de la UPC::Enginyeria de la telecomunicació
Degree of freedom
Interference control
Degrees of freedom
Delayed CSIT
Imperfect CSIT
Interference alignment
Interferències
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Institute of Electrical and Electronics Engineers (IEEE)
         

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