Title :
On the degrees of freedom of SISO interference and X channels with delayed CSIT
Author :
Abdoli, Mohammad Javad ; Ghasemi, Akbar ; Khandani, Amir Keyvan
Author_Institution :
Dept. of Electr. & Comput. Eng., Univ. of Waterloo, Waterloo, ON, Canada
Abstract :
The SISO (single-input single-output) AWGN interference and X channels in i.i.d. fading environment are considered where the transmitters have the past channel state information (CSI) through noiseless feedback links. New trans-mission schemes are proposed for these channels that achieve degrees of freedom (DoF) values greater than one (except for two-user interference channel). The achieved DoFs are strictly increasing with the number of users and asymptotically approach limiting values of ps 1.2663 and m 1.4427 for interference and X channels, respectively. The achieved DoFs are greater than the best previously reported DoFs for these channels with delayed CSI at transmitters.
Keywords :
AWGN channels; interference (signal); AWGN interference; SISO interference; channel state information; degrees of freedom; delayed CSIT; noiseless feedback links; single input single output; transmission schemes; x channels; Equations; Integrated circuits; Interference channels; MIMO; Receivers; Transmitters; Vectors;
Conference_Titel :
Communication, Control, and Computing (Allerton), 2011 49th Annual Allerton Conference on
Conference_Location :
Monticello, IL
Print_ISBN :
978-1-4577-1817-5
DOI :
10.1109/Allerton.2011.6120226
