DocumentCode :
1780194
Title :
A space-time Tx scheme for two-cell MISO-BC with delayed CSIT
Author :
Parajuli, Jhanak ; Abreu, Giuseppe
Author_Institution :
Sch. of Eng. & Sci., Jacobs Univ. Bremen, Bremen, Germany
fYear :
2014
fDate :
June 29 2014-July 4 2014
Firstpage :
1912
Lastpage :
1916
Abstract :
Perfect channel state information at the transmitter (CSIT) is required to completely characterize the optimal degrees of freedom (DoF) of an interfering network by zero-forcing. However, it is not always realistic to know the CSIT perfectly when the channel is varying rapidly with time. In that case, a delayed CSIT is a more reasonable assumption. In this paper, we study the DoF of interfering multiple input single output (MISO) broadcast channel (BC) when the delayed CSIT is known perfectly. We propose a space-time transmission scheme based on interference alignment for two-cell interfering MISO-BC with M transmit antennas and K users in each cell. Considering the various cases, we suggest that the achievable per cell DoF converges to K/K+1 in the case when M = K and the outdated CSIT is known perfectly. The DoF per cell approaches 1 as the number of users in each cell approach to infinity.
Keywords :
broadcast channels; radio transmitters; radiofrequency interference; transmitting antennas; DoF; channel state information at the transmitter; degree of freedom; delayed CSIT; interference alignment; multiple input single output broadcast channel; space-time Tx scheme; space-time transmission scheme; transmit antenna; two-cell MISO-BC; zero-forcing; Decoding; Equations; Interference; MIMO; Receivers; Transmitting antennas;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Information Theory (ISIT), 2014 IEEE International Symposium on
Conference_Location :
Honolulu, HI
Type :
conf
DOI :
10.1109/ISIT.2014.6875166
Filename :
6875166
Link To Document :
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