TY - GEN
T1 - Sum-rate analysis of general OFDM downlink channels with 1-bit feedback per sub-carrier
AU - Somekh, Oren
AU - Simeone, Osvaldo
AU - Haimovich, Alexander M.
AU - Bar-Ness, Yeheskel
PY - 2006/1/1
Y1 - 2006/1/1
N2 - The ergodic sum-rate capacity of a single-input single-output (SISO) OFDM downlink channel, with K homogenous users scales as log log K when optimal scheduling is employed under certain conditions. However, the optimal scheduling requires that the full channel state information (CSI) for all users be available to the transmitter utilizing valuable bandwidth resources. In [1], the authors show that almost the same capacity growth holds even if the feedback rate from the users to the transmitter is reduced to 1-bit per sub-carrier per fading block for a limited class of channels. In this work, we present an alternative simple analysis for a more general class of channels resulting in a closed form expression for the ergodic achievable sum-rate. The mechanism of setting sub-optimal thresholds for the 1-bit quantizers is elucidated by simple lower bound to the sum-rate. Setting these sub-optimal thresholds ensures the same growth rate and non-interference limited behavior (at high-SNR regime) as that of the full-CSI scheme asymptotically with K.
AB - The ergodic sum-rate capacity of a single-input single-output (SISO) OFDM downlink channel, with K homogenous users scales as log log K when optimal scheduling is employed under certain conditions. However, the optimal scheduling requires that the full channel state information (CSI) for all users be available to the transmitter utilizing valuable bandwidth resources. In [1], the authors show that almost the same capacity growth holds even if the feedback rate from the users to the transmitter is reduced to 1-bit per sub-carrier per fading block for a limited class of channels. In this work, we present an alternative simple analysis for a more general class of channels resulting in a closed form expression for the ergodic achievable sum-rate. The mechanism of setting sub-optimal thresholds for the 1-bit quantizers is elucidated by simple lower bound to the sum-rate. Setting these sub-optimal thresholds ensures the same growth rate and non-interference limited behavior (at high-SNR regime) as that of the full-CSI scheme asymptotically with K.
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U2 - 10.1109/CISS.2006.286483
DO - 10.1109/CISS.2006.286483
M3 - Conference contribution
SN - 1424403502
SN - 9781424403509
T3 - 2006 IEEE Conference on Information Sciences and Systems, CISS 2006 - Proceedings
SP - 306
EP - 311
BT - 2006 IEEE Conference on Information Sciences and Systems, CISS 2006 - Proceedings
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2006 40th Annual Conference on Information Sciences and Systems, CISS 2006
Y2 - 22 March 2006 through 24 March 2006
ER -