Cognitive Radio Oriented Wireless Networks. 10th International Conference, CROWNCOM 2015, Doha, Qatar, April 21–23, 2015, Revised Selected Papers

Research Article

Symbol Based Precoding in the Downlink of Cognitive MISO Channel

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  • @INPROCEEDINGS{10.1007/978-3-319-24540-9_30,
        author={Maha Alodeh and Symeon Chatzinotas and Bj\o{}rn Ottersten},
        title={Symbol Based Precoding in the Downlink of Cognitive MISO Channel},
        proceedings={Cognitive Radio Oriented Wireless Networks. 10th International Conference, CROWNCOM 2015, Doha, Qatar, April 21--23, 2015, Revised Selected Papers},
        proceedings_a={CROWNCOM},
        year={2015},
        month={10},
        keywords={Constructive interference Underlay cognitive radio MISO system},
        doi={10.1007/978-3-319-24540-9_30}
    }
    
  • Maha Alodeh
    Symeon Chatzinotas
    Björn Ottersten
    Year: 2015
    Symbol Based Precoding in the Downlink of Cognitive MISO Channel
    CROWNCOM
    Springer
    DOI: 10.1007/978-3-319-24540-9_30
Maha Alodeh1,*, Symeon Chatzinotas1,*, Björn Ottersten1,*
  • 1: University of Luxembourg
*Contact email: maha.alodeh@uni.lu, symeon.chatzinotas@uni.lu, bjorn.ottersten@uni.lu

Abstract

This paper proposes symbol level precoding in the downlink of a MISO cognitive system. The new scheme tries to jointly utilize the data and channel information to design a precoding that minimizes the transmit power at a cognitive base station (CBS); without violating the interference temperature constraint imposed by the primary system. In this framework, the data information is handled at symbol level which enables the characterization the intra-user interference among the cognitive users as an additional source of useful energy that should be exploited. A relation between the constructive multiuser transmissions and physical-layer multicast system is established. Extensive simulations are performed to validate the proposed technique and compare it with conventional techniques.