Enormous capacity advantage can be achieved on a flat MIMO channel compared to single antenna systems. V-BLAST was proposed to obtain such capacity advantage with low complexity. V-BLAST, however, requires multiple ma...
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Enormous capacity advantage can be achieved on a flat MIMO channel compared to single antenna systems. V-BLAST was proposed to obtain such capacity advantage with low complexity. V-BLAST, however, requires multiple matrix (pseudo) inversions that are still computationally intensive for a large number of antennas. Much research has been attracted to reducing the complexity. Our contribution is to show that the MMSE block decision-feedback equalizer equivalent to the MMSE V-BLAST can be calculated via Cholesky factorization of the error covariance matrix with symmetric permutation. Forward and backward filters as well as detection order are jointly optimized with significantly reduced complexity. Simulation results show that MMSE V-BLAST performance can be achieved by the proposed scheme.
In this contribution we propose two new iterative precoder and equalizer designs for the Downlink (DL) scenario of Multi-User (MU)-MIMO systems which employ Filter Bank based Multi-Carrier (FBMC) with Offset-Quadratur...
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The detailed knowledge of the directional characteristics of the mobile radio channel is required to develop directional channel models and to design efficient smart antenna concepts for future mobile radio systems. I...
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The detailed knowledge of the directional characteristics of the mobile radio channel is required to develop directional channel models and to design efficient smart antenna concepts for future mobile radio systems. In this paper, we examine the applicability and performance of two popular high-resolution parameter estimation schemes for directional channel sounding, namely subspace-based unitary ESPRIT and the maximum-likelihood-based SAGE algorithm. To this end, an investigation of the resolution capability using a synthetic scenario is carried out for both schemes by means of Monte-Carlo simulations. The performance is also compared to the Cramer-Rao lower bound (CRLB). Moreover, we apply both parameter estimation schemes to propagation data generated by a ray-tracing model. This model is based on indoor channel measurements generated by the wideband channel sounding system ECHO 24. The channel measurements were taken inside a radio frequency shielded room (RFSR), an environment dominated by severe specular multipath and, therefore, can be considered a worst case scenario.
Training-aided 2×2 MIMO FDE supported by 16-symbol CAZAC sequences has been demonstrated in hybrid WDM channels transmitted over a 480-km dispersion compensated link. Performance is evaluated with respect to a co...
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Our main emphasis is on the use of enhanced OFDM and filter bank based multicarrier (FB-MC) waveforms for utilizing effectively the available fragmented spectrum in heterogeneous radio environments. Special attention ...
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ISBN:
(纸本)9781467363365
Our main emphasis is on the use of enhanced OFDM and filter bank based multicarrier (FB-MC) waveforms for utilizing effectively the available fragmented spectrum in heterogeneous radio environments. Special attention is on the broadband-narrowband coexistence scenario of the Professional Mobile Radio (PMR) evolution. The target here is to provide broadband data services in coexistence with narrowband legacy services of the TETRA family. The core idea is a multi-mode radio platform, based on variable filter bank processing, which is able to perform modulation/detection functions simultaneously for different signal formats with adjustable center frequencies, bandwidths and subchannel spacings.
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