Measuring the impact of outdated channel state information in interference alignment techniques

2014 ◽  
Author(s):  
Gerald Artner ◽  
Martin Mayer ◽  
Maxime Guillaud ◽  
Markus Rupp
Keyword(s):  
Channel State Information ◽  
Interference Alignment ◽  
Channel State ◽  
State Information ◽  
Outdated Channel State Information ◽  
The Impact

scholarly journals Full-Duplex Relay with Delayed CSI Elevates the SDoF of the MIMO X Channel

Entropy ◽  
2021 ◽  
Vol 23 (11) ◽  
pp. 1484
Author(s):  
Tong Zhang ◽  
Gaojie Chen ◽  
Shuai Wang ◽  
Rui Wang
Keyword(s):  
Lower Bound ◽  
Channel State Information ◽  
Interference Alignment ◽  
Upper Bounds ◽  
Full Duplex ◽  
Multiple Antenna ◽  
Lower And Upper Bounds ◽  
Channel State ◽  
State Information ◽  
Full Duplex Relay

In this article, the sum secure degrees-of-freedom (SDoF) of the multiple-input multiple-output (MIMO) X channel with confidential messages (XCCM) and arbitrary antenna configurations is studied, where there is no channel state information (CSI) at two transmitters and only delayed CSI at a multiple-antenna, full-duplex, and decode-and-forward relay. We aim at establishing the sum-SDoF lower and upper bounds. For the sum-SDoF lower bound, we design three relay-aided transmission schemes, namely, the relay-aided jamming scheme, the relay-aided jamming and one-receiver interference alignment scheme, and the relay-aided jamming and two-receiver interference alignment scheme, each corresponding to one case of antenna configurations. Moreover, the security and decoding of each scheme are analyzed. The sum-SDoF upper bound is proposed by means of the existing SDoF region of two-user MIMO broadcast channel with confidential messages (BCCM) and delayed channel state information at the transmitter (CSIT). As a result, the sum-SDoF lower and upper bounds are derived, and the sum-SDoF is characterized when the relay has sufficiently large antennas. Furthermore, even assuming no CSI at two transmitters, our results show that a multiple-antenna full-duplex relay with delayed CSI can elevate the sum-SDoF of the MIMO XCCM. This is corroborated by the fact that the derived sum-SDoF lower bound can be greater than the sum-SDoF of the MIMO XCCM with output feedback and delayed CSIT.

Cognitive MIMO Relaying Networks With Primary User's Interference and Outdated Channel State Information

2014 ◽  
Vol 62 (12) ◽  
pp. 4241-4254 ◽  
Author(s):  
Yuzhen Huang ◽  
Fawaz S. Al-Qahtani ◽  
Caijun Zhong ◽  
Qihui Wu ◽  
Jinlong Wang ◽  
...  
Keyword(s):  
Channel State Information ◽  
Channel State ◽  
State Information ◽  
Outdated Channel State Information ◽  
Relaying Networks
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