Title:
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Performance of blind equalization with higher order statistics in indoor radio environments
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Author:
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Valenzuela González, José Luis; Valdominos Bardají, Antonio; Casadevall Palacio, Fernando José
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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. GRCM - Grup de Recerca en Comunicacions Mòbils |
Abstract:
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This paper analyzes the performance of blind equalization using the complex cepstrum of third-order moments
applied to 4-QAM time division multiple access (TDMA) indoor
radio communication systems. In particular, we have modeled
a dispersive indoor channel with Rice statistics. We used the
blind algorithms to estimate the channel-impulse response, and
from this, we computed the equalizer coefficients using a classical
minimum mean square error (MMSE) algorithm. In order to
evaluate the system performance, we calculated the bit error
rate (BER) of a decision feedback equalizer (DFE) that uses a
tricepstrum algorithm to estimate the channel-impulse response.
The results are compared with those obtained using a least sum
of square errors (LSSE) algorithm as a channel estimator and
considering the exact channel response. The results obtained show
that this kind of blind equalizer performs better than the more
classically trained equalizer when Rice channels with a strong
direct path and signal-to-noise ratios (SNR’s) lower than 20 dB
are taken into account. However, some problems relating to the
length of time needed for convergence must be solved. |
Abstract:
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Peer Reviewed |
Subject(s):
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-Àrees temàtiques de la UPC::Enginyeria de la telecomunicació::Radiocomunicació i exploració electromagnètica::Comunicacions mòbils -Mobile communication systems -Bit error rate -Blind algorithms -Blind equalization -Channel-impulse response estimation -Complex cepstrum -Data communication -Decision feedback equalisers -Dispersive indoor channel -Equalizer coefficients -Error statistics -Higher order statistics -Indoor radio communication systems -Indoor radio environments -Land mobile radio -Least mean squares methods -Least sum of square errors -Minimum mean square error -Quadrature amplitude modulation -Rice statistics -Rician channels -System performance -Third-order moments -Time division multiple access -Tricepstrum algorithm -4-QAM time division multiple access -BER -DFE -LSSE -MMSE -SNR's -TDMA -Channel estimator -Multipath channel -Multiple acces -Sistemes de comunicacions mòbils |
Rights:
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Document type:
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Article |
Published by:
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IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
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