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In this paper, a new joint symbol detection and channel tracking algorithm is proposed for the coded MIMO-OFDM systems over time-varying frequency-selective fading channels. The iterative detection/decoding and channel estimation are iteratively employed based on the Variational Bayes expectation-maximization (VBEM) algorithm to improve the system performance. A modified list sphere decoder (LSD)...
A low complexity iterative receiver is proposed in this paper for MIMO-OFDM systems in time-varying multi-path channel based on the variational Bayes (VB) method. According to the VB method, the estimation algorithms of the signal distribution and the channel distribution are derived for the receiver. With the aid of the soft-output QRD-M algorithm, whose complexity is fixed and relatively low, the...
A practical variational Bayes (VB) iterative receiver with joint signal detection and channel estimation is proposed in this paper for MIMO-OFDM systems in time-varying multipath channel. Since the VB method provides distribution-estimates of the parameters, the soft-input soft-output (SISO) QRD-M algorithm is exploited to estimate the signal distribution, and several channel estimation algorithms...
The stack algorithm is a promising tree-search algorithm with relatively low computation complexity for multi-input multi-output (MIMO) systems. Recent researches show that it obtains low detection complexity at the price of performance degradation. To achieve a better compromise between computational complexity and detection performance, a sphere constraint stack detection algorithm (SC-Stack) is...
In this paper, a new joint symbol detection and channel estimation algorithm is proposed for MIMO-OFDM systems over frequency-selective fading channels using the variational Bayesian expectation-maximization (VBEM) algorithm. Since the VBEM algorithm can provide distribution-estimates of the parameters, the statistical information about the channel uncertainty is exploited to improve the evaluation...
In this paper, a new joint channel tracking and symbol detection algorithm is proposed for MIMO-OFDM systems over the time-varying frequency-selective fading channel. The iterative detection/decoding and channel estimation are combined to improve system performance. With the aid of the candidate list from list sphere decoder (LSD), the channel frequency response of each subcarrier is estimated by...
This paper investigates iterative channel estimation for multiple-input multiple-output (MIMO) systems with orthogonal frequency division multiplexing (OFDM) transmission technique. Using the candidate list obtained by the list sphere decoder (LSD), the soft information is calculated and fed back to the channel estimator which is based on the maximum a posteriori (MAP) version of the expectation-maximization...
In this paper, a novel superimposed pilot scheme is presented, which not only has the optimized MSE (mean squared error) of channel estimation, SINR (signal-to-interference noise ratio) and PAPR (peak-to-aver age power ratio) simultaneously, but also is robust to de-offset. The relationships of MSE and SINR with pilot parameters are analyzed through simulation. Comparison proves that the proposed...
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