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Performance of blind equalization with higher order statistics in indoor radio environments
Valenzuela González, José Luis; Valdominos Bardají, Antonio; Casadevall Palacio, Fernando José
Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions; Universitat Politècnica de Catalunya. GRCM - Grup de Recerca en Comunicacions Mòbils
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.
Peer Reviewed
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
Channel estimator
Multipath channel
Multiple acces
Sistemes de comunicacions mòbils

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