This paper investigates the problem of dynamic
multiuser subchannel allocation in the downlink OFDM
systems. In traditional TDMA or FDMA systems, resource
allocation for each user is non-adaptively fixed. Since the
subchannel allocations among the users are not optimized, a
group of users is likely to suffer from poor channel gains
resulting from large path loss and random fading. To resolve
this problem a low-complexity adaptive subchannel allocation
algorithm is proposed in this paper. By adaptively assigning
frequency subchannels, n take advantage of channel diversity
among users in different locations, which is called Multiuser
diversity. The capacity of MU-OFDM is maximized when each
subchannel is assigned to the user with the best channel-to-
noise ratio for that subchannel. However, fairness among the
users cannot generally be achieved with such a scheme. In this
paper, a set of proportional fairness constraints is imposed to
assure that each user achieve a required data rate, that ensures
quality of service. In the proposed algorithm, subchannel
allocation is performed by assuming an equal power
distribution.
%0 Journal Article
%1 harishkumargvenkatbabu2011dynamic
%A Harish Kumar, G. Venkat Babu, Upadhayay M D
%D 2011
%E Das, Dr.Vinu V
%J International Journal on Communication
%K ofdm
%N 1
%P 4
%T Dynamic Sub-Channel Allocation in Multiuser
OFDM Systems to Achieve Variable Data Rate
%U http://ijcom.searchdl.org
%V 2
%X This paper investigates the problem of dynamic
multiuser subchannel allocation in the downlink OFDM
systems. In traditional TDMA or FDMA systems, resource
allocation for each user is non-adaptively fixed. Since the
subchannel allocations among the users are not optimized, a
group of users is likely to suffer from poor channel gains
resulting from large path loss and random fading. To resolve
this problem a low-complexity adaptive subchannel allocation
algorithm is proposed in this paper. By adaptively assigning
frequency subchannels, n take advantage of channel diversity
among users in different locations, which is called Multiuser
diversity. The capacity of MU-OFDM is maximized when each
subchannel is assigned to the user with the best channel-to-
noise ratio for that subchannel. However, fairness among the
users cannot generally be achieved with such a scheme. In this
paper, a set of proportional fairness constraints is imposed to
assure that each user achieve a required data rate, that ensures
quality of service. In the proposed algorithm, subchannel
allocation is performed by assuming an equal power
distribution.
@article{harishkumargvenkatbabu2011dynamic,
abstract = { This paper investigates the problem of dynamic
multiuser subchannel allocation in the downlink OFDM
systems. In traditional TDMA or FDMA systems, resource
allocation for each user is non-adaptively fixed. Since the
subchannel allocations among the users are not optimized, a
group of users is likely to suffer from poor channel gains
resulting from large path loss and random fading. To resolve
this problem a low-complexity adaptive subchannel allocation
algorithm is proposed in this paper. By adaptively assigning
frequency subchannels, n take advantage of channel diversity
among users in different locations, which is called Multiuser
diversity. The capacity of MU-OFDM is maximized when each
subchannel is assigned to the user with the best channel-to-
noise ratio for that subchannel. However, fairness among the
users cannot generally be achieved with such a scheme. In this
paper, a set of proportional fairness constraints is imposed to
assure that each user achieve a required data rate, that ensures
quality of service. In the proposed algorithm, subchannel
allocation is performed by assuming an equal power
distribution.
},
added-at = {2012-02-15T12:23:27.000+0100},
author = {{Harish Kumar, G. Venkat Babu}, Upadhayay M D},
biburl = {https://www.bibsonomy.org/bibtex/252cf8cb2beb838dd7f34a71035c87fbe/idesajith},
editor = {Das, Dr.Vinu V},
interhash = {2059a5698aa04c65879f8462630621f6},
intrahash = {52cf8cb2beb838dd7f34a71035c87fbe},
journal = {International Journal on Communication},
keywords = {ofdm},
month = {march},
number = 1,
pages = 4,
timestamp = {2012-02-15T12:23:27.000+0100},
title = {Dynamic Sub-Channel Allocation in Multiuser
OFDM Systems to Achieve Variable Data Rate
},
url = {http://ijcom.searchdl.org},
volume = 2,
year = 2011
}