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In this letter, we investigate the downlink performance of massive multiple-input multiple-output (MIMO) systems where the base station is equipped with one-bit analog-to-digital/digital-to-analog converters (ADC/DACs). We assume that the base station employs the linear minimum mean-squared-error channel estimator and treats the channel estimate as the true channel to precode the data symbols. We...
Cloud-radio access networks (C-RANs) are considered as energy efficient network architectures. Nevertheless, a dilemma in C-RAN architecture is to simultaneously optimize both spectral efficiency (SE) and energy efficiency (EE). In this paper, the tradeoff between SE and EE are studied considering a downlink multicasting transmission scenario in a C-RAN. In particular, to effectively mitigate the...
In order to extend the available spectrum to deal with the dramatically increasing data traffic, unlicensed spectrum, e.g., 5 GHz, is considered by the mobile operators as a complement in addition to licensed spectrum. The licensed-assisted access using Long Term Evolution (LAA-LTE) in unlicensed spectrum has been studied in the 3rd Generation Partnership Project (3GPP) Release 13 to achieve more...
Coverage enhancement is important to support and broaden the application of the machine type communication( MTC) in long term evolution (LTE). Coverage enhancement for physical downlink control channel(PDCCH) is one key issue. A new compact PDCCH for MTC was widely proposed to provide coverage enhancement gain. However, due to the inclusion of cyclic redundancy check(CRC) sequence, the coverage enhancement...
This paper focuses on investigating the search space design of Enhanced Physical Downlink Control CHannel (EPD-CCH), which is introduced in Long Term Evolution-Advanced (LTE-A) system to increase the capacity of the downlink control channel. Since EPDCCH is frequency-division-multiplexed with downlink data channel, resource utilization efficiency is a very important issue in addition to blocking probability...
This paper investigates spectrum resource coordination for the mixed macrocell and femtocell deployment. Though sharing spectrum provides larger bandwidth for both macrocell and femtocell, cross-tier interferences exist and become drawbacks for them to achieve higher capacities. After analyzing the interferences when using shared spectrum, we propose to employ hybrid spectrum sharing with respect...
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