Title :
On the Ergodic Capacity of Fading Cognitive Radio MIMO Z-Interference Channel
Author :
Mao, Junling ; Gao, Jinchun ; Liu, Yuanan ; Xie, Gang
Author_Institution :
Key Lab. of Universal Wireless Commun. for the Minist. of Educ., Beijing Univ. of Posts & Telecommun., Beijing, China
fDate :
11/1/2011 12:00:00 AM
Abstract :
In this letter, the ergodic capacity maximization problem is first studied in the fading cognitive multiple-input multiple-output (MIMO) Z-interference channel (ZIC), where the interference from the primary transmitter (PT) to the secondary receiver (SR) is omitted. With the statistical channel state information (CSI) feedback, we find the optimal and the low complexity sub-optimal power strategies for fading cognitive MIMO ZIC to maximize its ergodic capacity under total power constraint, interference power constraint and rank constraint. Simulation results show that the proposed sub-optimal scheme is very efficient and almost achieves the optimal performance.
Keywords :
MIMO communication; channel capacity; cognitive radio; fading channels; interference suppression; radio receivers; radio transmitters; statistical analysis; MIMO; Z-interference channel; channel state information; cognitive radio; ergodic channel capacity; fading channel; interference power constraint; multiple input multiple output; rank constraint; receiver; statistical feedback; transmitter; Complexity theory; Covariance matrix; Fading; Interference; MIMO; Receivers; Signal processing algorithms; Cognitive radio; MIMO; ergodic capacity;
Journal_Title :
Communications Letters, IEEE
DOI :
10.1109/LCOMM.2011.092011.110611
