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Distributed Rate Adaptation and Power Control in Fading Multiple Access Channels

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Title Distributed Rate Adaptation and Power Control in Fading Multiple Access Channels
 
Creator SREEKUMAR, S
DEY, BK
PILLAI, SRB
 
Subject SIDE INFORMATION
CAPACITIES
CAUSAL
STATE
Multiple access channels
distributed state information
block fading models
adaptive capacity region
power control
rate adaptation
 
Description Traditionally, the capacity region of a coherent fading multiple access channel (MAC) is analyzed in two popular contexts. In the first, a centralized system with full channel state information at the transmitters (CSITs) is assumed, and the transmit power and data-rate can be jointly chosen for every fading vector realization. On the other hand, in fast-fading links with distributed CSIT, the lack of full CSI is compensated by performing ergodic averaging over sufficiently many channel realizations. Notice that the distributed CSI may necessitate decentralized power-control for optimal data-transfer. Apart from these two models, the case of slow-fading links and distributed CSIT, though relevant to many systems, has received much less attention. In this paper, a block-fading additive white Gaussian noise MAC with full CSI at the receiver and distributed CSI at the transmitters is considered. The links undergo independent fading, but otherwise have arbitrary fading distributions. The channel statistics and respective long-term average transmit powers are known to all parties. We first consider the case where each encoder has knowledge only of its own link quality, and not of others. For this model, we compute the adaptive capacity region, i.e., the collection of average rate-tuples under blockwise coding/decoding such that the rate-tuple for every fading realization is inside the instantaneous MAC capacity region. The key step in our solution is an optimal rate allocation function for any given set of distributed power control laws at the transmitters. This also allows us to structurally characterize the optimal power control for a wide class of fading models. Further extensions are also proposed for the case where each encoder has additional partial CSI about the other links.
 
Publisher IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
 
Date 2016-01-15T09:29:38Z
2016-01-15T09:29:38Z
2015
 
Type Article
 
Identifier IEEE TRANSACTIONS ON INFORMATION THEORY, 61(10)5504-5524
0018-9448
1557-9654
http://dx.doi.org/10.1109/TIT.2015.2463271
http://dspace.library.iitb.ac.in/jspui/handle/100/18254
 
Language en