DocumentCode :
3506050
Title :
The degrees of freedom region of the two-user MIMO broadcast channel with delayed CSIT
Author :
Vaze, Chinmay S. ; Varanasi, Mahesh K.
Author_Institution :
Dept. of Electr., Comput., & Energy Eng., Univ. of Colorado, Boulder, CO, USA
fYear :
2011
fDate :
July 31 2011-Aug. 5 2011
Firstpage :
199
Lastpage :
203
Abstract :
The degrees of freedom (DoF) region of the K-user MIMO (multiple-input multiple-output) Gaussian broadcast channel (BC) is studied under i.i.d. fading when there is delayed channel state information at the transmitter (CSIT). The general case of the MIMO BC is considered where each terminal has an arbitrary number of antennas. The delayed CSIT assumption is that the transmitter has perfect knowledge of `stale´ channel states (i.e., with some delay) but no knowledge of current CSI. An outer-bound to the DoF region is derived. This bound is shown to be tight in the 2-user case via an interference alignment scheme that optimally accounts for multiple and possibly distinct number of antennas at the two receivers.
Keywords :
Gaussian channels; MIMO communication; broadcast channels; delays; Gaussian broadcast channel; degrees of freedom region; delayed CSIT; delayed channel state information; two user MIMO broadcast channel; Fading; Interference; MIMO; Receiving antennas; Transmitting antennas; Broadcast channel; degrees of freedom; delayed CSIT; interference alignment; outer bound;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Information Theory Proceedings (ISIT), 2011 IEEE International Symposium on
Conference_Location :
St. Petersburg
ISSN :
2157-8095
Print_ISBN :
978-1-4577-0596-0
Electronic_ISBN :
2157-8095
Type :
conf
DOI :
10.1109/ISIT.2011.6033903
Filename :
6033903
Link To Document :
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