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This paper introduces a simple and practical channel estimator for multipath multi-cell massive MIMO TDD systems with pilot contamination. Least squares (LS) channel estimators present low performance under moderate to strong pilot contamination, while minimum mean square error (MMSE) estimators perform much better than LS estimators in such conditions. However, MMSE estimators present an issue that...
We present a radio channel sounding approach for characterizing three-dimensional radio channel at 10 GHz. The measurement system consists of a vector network analyzer, two dual polarized patch antennas, programmable virtual antenna array in both link ends, together with an automatized measurement control software. The radio channel measurements are performed to validate the detected propagation paths...
We analyze the performance limits of the digital back-propagation (DBP) algorithm implemented in application specific integrated circuits (ASIC). The proposed hardware implementation, jointly with a set of other digital signal processing (DSP) blocks, was experimentally evaluated by processing a 32 GBd PDM-16QAM signal. In the transmitter side, it is discussed the linear filters complexity for Nyquist...
In this paper, the mutual information outage probability (P) for dual-hop decode-and-forward multiple-input multiple-output (MIMO) relay channel is obtained. Rayleigh distribution is used to model MIMO channels, and both full-duplex and half-duplex modes are investigated. Co-channel interference at relay and destination nodes has been considered.
In this paper, we investigate the outage probability for the mutual information of the sum rate for the MIMO (multiple input multiple output) MAC (multiple access channel) channel. We derive exact results for the “two users” case with two antennas and a general result for K users with an arbitrary number of antennas and different signal-to-noise ratios. As a secondary result, we derive an exact expression...
The purpose of this paper is to derive a general analytical expression for the correlation coefficient of signals received by two different antennas as a function of the distance between them (baseline distance), the signal bandwidth, and the antenna beamwidth. The two antennas are supposed to be part of a radar system for detecting meteorological phenomena such as rain and clouds. One of the antennas...
In this work we compare full-duplex (FD) and half-duplex (HD) relaying in terms of outage probability and throughput. We consider a practical FD relay model where the loop interference between transmitted and received signals is taken into account. We analyze two modes for FD transmission, block Markov encoding and multi-hop transmission without interference cancellation, and two different modes for...
Due its stochastic behavior, the polarization-mode dispersion is one of most difficult fiber effects to simulate. It is not easy to randomly change the temperature and pressure in laboratory and the correct relation between this changes and light polarization is fuzzy yet. Therefore the most common way to study PMD is through the use of devices called PMD emulators. The main problem with this emulators...
In this paper, an exact new closed formula for the multivariate alpha-mu joint probability density function (PDF) is derived allowing for an arbitrary correlation matrix. In addition, the bit error rate (BER) and the outage probability for the selection combining (SC) technique in a correlated alpha-mu fading channel is obtained.
In this paper, exact expressions for the level crossing rate (LCR) and average fade duration (AFD) for two-branch selection, equal-gain and maximal-ratio combining systems in a Hoyt fading environment are presented. The expressions apply to unbalanced, non-identical, correlated diversity channels and have been validated by specializing the general results to some particular cases whose solutions are...
General exact expressions for the level crossing rate and average fade duration of dual-branch selection, equal-gain, and maximal-ratio combiners operating over non-identical correlated Ricean channels are derived. Sample numerical results are discussed by specializing the general expressions to a space-diversity system with horizontally spaced omnidirectional antennas at the mobile station. When...
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