Broadcast channel : degrees of freedom with no CSIR

Salim, Umer;Slock, Dirk T M
ALLERTON 2008, 46th Allerton Conference on Communication, Control and Computing, September 23-26, 2008, Monticello, USA

We analyze a broadcast channel with no initial assumption of channel state information neither at the base station (BS) nor at the users’ side. For the case when there is  no possibility of feedback to the BS and it remains oblivious of the channel state information throughout the transmission,  it is shown that the capacity region is bounded by the capacity  of a point-to-point MISO link and hence the pre-log of the  sum rate is (1 1/T) for a block fading channel of coherence  length T.When the BS is allowed to acquire channel knowledge,  operating under time-division duplex (TDD) mode, we give very simple scheme through which BS and all users get necessary channel state information and the high SNR sum rate shows significant multiplexing gain or degrees of freedom  (DOF).

 

 

 


DOI
Type:
Conférence
City:
Monticello
Date:
2008-09-23
Department:
Systèmes de Communication
Eurecom Ref:
2652
Copyright:
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