H. Viet Nguyen

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Power line communications (PLC) suffers performance degradation due mainly to impulsive noise interference generated by electrical appliances. This paper considers the application of bit-interleaved coded modulation with iterative decoding (BICM-ID) in the Class-A impulsive noise environment to improve the spectral efficiency and error performance of PLC.(More)
A bandwidth-efficient joint network-channel coding scheme based on distributed turbo codes is proposed for relay-based wireless communications systems. The proposed scheme provides a solution to increase the transmission rate and/or improve the error performance. To enhance the system performance over the adverse block fading channels, the relay not only(More)
The problem of channel estimation for spatially correlated fading multiple-input multiple-output (MIMO) channels is considered. Based on the channel's second order statistic, the minimum mean-square error (MMSE) channel estimator that works with the superimposed training signal is proposed. The problem of designing the optimal superimposed signal is then(More)
An approach to turbo and iterative channel equalization is proposed for downlink code division multiple access (CDMA) receivers. At each iteration, the method employs a linear minimum mean squared error (LMMSE) equalizer that incorporates feedback information obtained in the previous iteration. The LMMSE filter is updated iteratively to provide incremental(More)
  • H.H. Nguyen
  • 2004
This paper studies the effect of time-limited chip waveform shaping on the performance of multicarrier direct-sequence code division multiple access (MC-DS-CDMA) systems. The performance criterion is the average multiple access interference (MAI) at the output of a correlation receiver. Comparison among different chip waveforms is made based on a fixed bit(More)
Affine preceding superimposes training signals on linearly precoded data. It enhances symbol recovery and effectively identifies the frequency-selective fading channel. Previous works have shown its advantage over the standard time-multiplexed training. This paper considers orthogonal affine precoding for joint channel estimation and symbol detection in(More)
This paper considers coded modulation systems based on low-density parity-check (LDPC) codes of finite lengths. The union bounds are derived for the bit error probabilities of the maximum likelihood decoding over both additive white Gaussian noise (AWGN) and flat fading channels. The bounds are useful to compare LDPC coded modulation schemes employing(More)
This paper presents the development process of a decision support system for pre-filtering and analysis of data for the carbon dioxide (CO2) capture process. Chemical absorption is becoming one of the dominant CO2 capture technologies because of its efficiency and low cost. Since the chemical absorption process consists of dozens of components, it generates(More)
The application of bit-interleaved coded modulation and iterative decoding (BICM-ID) in OFDM systems with modulation diversity over frequency selective Rayleigh fading channels is considered. A tight bound on the asymptotic error performance is first derived for general preceding over all N subcarriers and used to establish the best achievable performance(More)
This paper generalizes the application of bit interleaved coded modulation with iterative decoding (BICM-ID) using signal space diversity (SSD) over keyhole Nakagami-m fading channels. The tight union bound on the asymptotic error performance is first analytically derived. The optimal rotation matrix with respect to both the asymptotic performance and the(More)