Abstract
Distributed Antenna Systems (DAS) are an alternative of network deployment that allows reducing the distance between transmitter and receiver by distributing the antennas throughout the coverage area. Moreover, the performance of the millimeter wave (mmWave) band can be significantly high within short transmitter-receiver distances. In this paper, the potential benefits of DAS deployments in the mmWave band are studied. To this aim, a distributed hybrid precoding (DHP) solution with remote antenna unit (RAU) selection capabilities is proposed and analyzed in an indoor DAS working in mmWaves and compared to two other indoor deployment strategies: a conventional cellular system with colocated antenna arrays and a small cell deployment. The results show that, using DHP, DAS not only brings huge gains to cell-edge users rate but also increases system capacity, becoming the best overall deployment. Further simulations including practical limitations have revealed that DAS using DHP is quite robust to combiner losses, although its performance is significantly degraded by outdated channel reports.
Highlights
In order to address the huge data rate demands and high connectivity and mobility required by next-generation mobile networks, a deep change in the cellular architecture design is needed
Afterwards, the same scenarios are analyzed including the effect of nonideal assumptions such as outdated Channel State Information (CSI) or losses introduced by nonideal Radio Frequency (RF) combiners
For the simulation of Regularized Zero Forcing (RZF) precoding in the different deployments, each Base Station (BS) is considered to be equipped with as many RF chains as antennas, what results in a total of 48 RF chains in the system
Summary
It is worth noting that the joint utilization of DAS and mmWaves for indoor scenarios can bring about large benefits of synergy, thanks to the reduction of the distance between transmitter and receiver given by DAS and to the optimum performance of mmWaves within short links This motivates the work presented in this paper, in which the performance of DAS working in mmWaves has been assessed. To this aim, a distributed hybrid precoding solution with RAU selection capabilities is proposed for indoor DAS deployments, and its performance is analyzed and compared to two other indoor deployment strategies: a conventional cellular system with colocated antenna arrays and a small cell deployment.
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