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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)...
We derive detection metrics for soft-output diversity combining for the case of imperfect channel state information at the receiver. We treat in particular the case when the noise variance at the receiver is unknown. We contrast conventional training-based methods to a detector based on the generalized likelihood-ratio (GLR) test paradigm. We study the performance of the detectors via EXIT chart analysis...
In this paper, the effects of the antenna shapes on the indoor MIMO channel capacity are analyzed based on a rigorous numerical model. Based on network theory, we first give the rigorous MIMO channel transfer function using the admittance matrices of the transmitter and receiver, and the admittance matrix between them. Consequently, we use the multilevel Green's function interpolation method (MLGFIM)...
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...
Inhomogeneous breast tissue has a strong scattering effect when the breast is illuminated by a detecting signal. This effect influences the tumor's response signal and makes the imaging result worse. This paper presents an efficient imaging approach to detect breast tumor in inhomogeneous tissue. We separated the transmitter and receiver to lower the rigorous request for antenna design. An ultra wideband...
Channel estimation plays an important role in CDMA systems. The main obstacles to channel estimation accuracy are the time variant character of the channel and noises at the receiver. When linear interpolation channel estimation algorithm is employed, these two factors are always contradictory to each other. In this paper, for the same interpolation density, this compromise is analyzed by comparing...
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