Title :
On the performance limits of cognitive MIMO channels
Author :
Akin, Sami ; Gursoy, Mustafa Cenk
Author_Institution :
Dept. of Electr. Eng., Univ. of Nebraska-Lincoln, Lincoln, NE, USA
Abstract :
In this paper, throughput of cognitive multiple-input multiple-output (MIMO) systems operating under quality-of-service (QoS) constraints is studied. It is assumed that transmission power and the covariance of the input signal vector are varied depending on the sensed activities of primary users in the system. Considering the reliability of the transmission and channel sensing results, a state-transition model is provided. Effective capacity is determined, and expressions for the first and second derivatives of the effective capacity are obtained at SNR =0. The minimum bit energy requirements in the presence of QoS limitations are identified. Numerical results are provided.
Keywords :
MIMO communication; cognitive radio; quality of service; telecommunication network reliability; QoS constraints; channel sensing results; cognitive MIMO channels; cognitive multiple-input multiple-output systems; quality-of-service; signal vector; state-transition model; transmission power; transmission reliability; Covariance matrix; Fading; MIMO; Quality of service; Radio transmitters; Sensors; Signal to noise ratio;
Conference_Titel :
Wireless Communications and Networking Conference (WCNC), 2011 IEEE
Conference_Location :
Cancun, Quintana Roo
Print_ISBN :
978-1-61284-255-4
DOI :
10.1109/WCNC.2011.5779381
