On Degrees of Freedom Region of MIMO Networks Without Channel State Information at Transmitters

2012 ◽  
Vol 58 (2) ◽  
pp. 849-857 ◽  
Author(s):  
Chiachi Huang ◽  
Syed Ali Jafar ◽  
Shlomo Shamai ◽  
Sriram Vishwanath
Keyword(s):  
Channel State Information ◽  
Degrees Of Freedom ◽  
Channel State ◽  
State Information ◽  
Mimo Networks

Degrees of Freedom of 2-Tier Networks Without Channel State Information at the Transmitter

2019 ◽  
Vol 26 (2) ◽  
pp. 382-386
Author(s):  
Maximo Morales-Cespedes ◽  
Luc Vandendorpe ◽  
Ana Garcia Armada
Keyword(s):  
Channel State Information ◽  
Degrees Of Freedom ◽  
Channel State ◽  
State Information

scholarly journals MISO Broadcast Channel under Unequal Link Coherence Times and Channel State Information

Entropy ◽  
2020 ◽  
Vol 22 (9) ◽  
pp. 976
Author(s):  
Mohamed Fadel Shady ◽  
Aria Nosratinia
Keyword(s):  
Channel State Information ◽  
Degrees Of Freedom ◽  
Entropy Inequality ◽  
Block Length ◽  
Broadcast Channel ◽  
Node Mobility ◽  
Channel State ◽  
State Information ◽  
Number Of Factors ◽  
Outer Bounds

The broadcast channel may experience unequal link coherence times due to a number of factors including variation in node mobility or local scattering conditions. This means the block fading model for different links may have nonidentical block length, and the channel state information for the links may also not be identical. The faster the fading and the shorter the fading block length, the more often the link needs to be trained and estimated at the receiver, and the more likely that channel state information (CSI) is stale or unavailable at the transmitter. This paper investigates a MISO broadcast channel where some receivers experience longer coherence intervals and other receivers experience shorter coherence intervals and must estimate their receive-side CSI (CSIR) frequently. We consider a variety of transmit-side CSI (CSIT) conditions for the abovementioned model, including no CSIT, delayed CSIT, or hybrid CSIT. To investigate the degrees of freedom region, we employ interference alignment and beamforming along with a product superposition that allows simultaneous but noncontaminating transmission of pilots and data to different receivers. Outer bounds employ the extremal entropy inequality as well as a bounding of the performance of a discrete, memoryless, multiuser, multilevel broadcast channel. For several cases, inner and outer bounds are established that either partially meet, or the gap diminishes with increasing coherence times.

scholarly journals Degrees of Freedom of Generic Block-Fading MIMO Channels Without a Priori Channel State Information

2014 ◽  
Vol 60 (12) ◽  
pp. 7760-7781 ◽  
Author(s):  
Gunther Koliander ◽  
Erwin Riegler ◽  
Giuseppe Durisi ◽  
Franz Hlawatsch
Keyword(s):  
Channel State Information ◽  
Degrees Of Freedom ◽  
A Priori ◽  
Mimo Channels ◽  
Channel State ◽  
State Information
Sign in / Sign up

Export Citation Format

Share Document