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This paper investigates the performance of massive multiple-input multiple-output (MIMO) cellular systems with pilot contamination. We derive a closed-form approximation of the area spectral efficiency (ASE) for uplink multicell multiuser massive MIMO systems by using a uniformly distributed user location model. Considering a practical power consumption model, we obtain the area energy efficiency...
We consider the downlink multi-user multi-cell massive MIMO systems, and our system model accounts for channel estimation, pilot contamination, and uniformly random user location distribution. An equivalent channel model is investigated which indicates that the users in various cells come through the same ‘fast fading’ when they reuse the same training signal in uplink pilot transmission phase. Assuming...
This paper investigates the uplink performance of multiple-input multiple-output (MIMO) wireless systems employing linear minimum mean-squared error (MMSE) receivers. We focus on multi-cell MU-MIMO systems with pilot contamination over i.i.d Rayleigh fading channels. The MMSE estimator is adopted to get the CSI and we build the equivalent model of estimated channel for MU-MIMO system with pilot contamination...
The spectral efficiency of multi-cell multi-user distributed antenna system with imperfect channel state information (CSI) is studied in this paper. First, considering the pilot contamination and minimum mean-squared-error (MMSE) channel estimation, the equivalent channel model is presented and the sum-rate of the uplink transmission is derived. Under a physical channel model, the equivalent channel...
Compared to the central antenna system (CAS), the distributed antenna system (DAS) improves the communication performance greatly because of the macro-diversity and the micro-diversity. However, the channel between the mobile terminal and a remote access unit (RAU) in the DAS is a composite fading channel, which makes it be difficult to achieve a closed form expression in capacity analysis. In this...
In this paper, we present a low complexity frequency-domain turbo equalization algorithm for single-carrier system without cyclic prefix. Comparing with the traditional time-domain turbo equalization, the proposed algorithm can be implemented in the frequency domain with fast Fourier transform (FFT), and it does not involve matrix inversion. Simulation results show that the proposed algorithm also...
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