Title:
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SINR profile for spectral efficiency optimization of SIC receivers in the many-user regime
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Author:
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Sala Álvarez, José; Villares Piera, Nemesio Javier; Rey Micolau, Francesc
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Other authors:
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Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions; Universitat Politècnica de Catalunya. SPCOM - Grup de Recerca de Processament del Senyal i Comunicacions |
Abstract:
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Abstract:
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In dense wireless scenarios, and particularly under
high traffic loads, the design of efficient random access protocols
is necessary. Some candidate solutions are based on Direct-
Sequence Spread Spectrum (DS-SS) combined with a Successive
Interference Cancellation (SIC) demodulator, but the perfor-
mance of these techniques is highly related to the distribution
of the users received power. In that context, this paper presents
a theoretical analysis to calculate the optimum user SINR profile
at the decoder maximizing the spectral efficiency in bps/Hz for
a specific modulation and practical Forward Error Correction
(FEC) code. This solution is achieved by means of Variational
Calculus operating in the asymptotic large-user case. Although
a constant SINR function has been typically assumed in the
literature (the one maximizing capacity), the theoretical results
evidence that the optimum SINR profile must be an increasing
function of the users received power. Its performance is compared
with that of the uniform profile for two representative scenarios
with different channel codes in a slightly overloaded system.
The numerical results show that the optimum solution regulates
the network load preventing the aggregate throughput from
collapsing when the system is overloaded. In scenarios with a
large number of transmitters, this optimum solution can be
implemented in an uncoordinated manner with the knowledge
of a few public system parameters. |
Abstract:
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Peer Reviewed |
Subject(s):
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-Àrees temàtiques de la UPC::Enginyeria de la telecomunicació::Telemàtica i xarxes d'ordinadors -Wireless communication systems -Spread spectrum -Multiple-access -Successive interference -Cancellation -Spectral efficiency -Throughput -Variational calculus -Uncoordinated access -Comunicació sense fil, Sistemes de |
Rights:
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Document type:
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Article - Published version Conference Object |
Published by:
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Institute of Electrical and Electronics Engineers (IEEE)
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