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Energy consumption is an issue in general in information and communication technologies (ICT), but also cellular communications in particular. Base station sites are the main energy consumers in a mobile network. Their energy consumption significantly contributes to green house gas (CO2) emissions. Hence, service providers are looking for energy saving solutions in their existing and future deployments...
In this paper, we study precoded MIMO based small cell networks. We derive the theoretical sum-rate capacity, when multi-antenna base stations transmit precoded information to its multiple single-antenna users in the presence of inter-cell interference from neighboring cells. Due to an interference limited scenario, increasing the number of antennas at the base stations does not yield necessarily...
To improve link reliability and data throughput in wireless communications, it is well known that we can exploit both the spatial and the temporal domain by precoding and scheduling, respectively. For cellular networks, however, most of these gains can only be obtained when frequency resources are carefully allocated to the different base stations as otherwise, they are compromised by the presence...
We compare the downlink throughput of various cellular architectures with multi-antenna base stations and multiple single-antenna users per cell, by considering a number of inherent physical layer issues such as path-loss and time and frequency selective fading. In particular, we focus on Multiuser MIMO (MU-MIMO) downlink techniques that require channel state information at the transmitter (CSIT)...
Cooperative MIMO is a key technology for next generation mobile communications. This technique is used to improve cell edge throughput performance. In this paper, we propose a cooperative MIMO scheme with FFR, and evaluate downlink performance of the scheme. We use 3 sector structures per cell. The sector cell is divided into two regions, inner cell and outer cell. The frequency reuse factor (FRF)...
A performance and cost comparison is made between analogue and digital optical transmission technologies for linking remote radio heads to digital base stations for future wireless systems with wide channel bandwidth and multiple MIMO channels.
Interference management is essential toward improving spectral efficiency in wireless networks. During the last decade inter-antenna interference management via multiple-input multiple output (MIMO) transmission has attracted attention for its capability to enhance link spectral efficiency. In a cellular environment, however, inter-cell interference imposes another limit on link spectral efficiency...
This paper studies efficient complex valued matrix manipulations for multi-user STBC-MIMO decoding. A novel method called Alamouti blockwise analytical matrix inversion (ABAMI) is proposed for the inversion of large complex matrices that are based on Alamouti sub-blocks. Another method using a variant of Givens rotation is proposed for fast QR decomposition of this kind of matrices. Our solutions...
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