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Applying 6-100 GHz spectrum to mobile communications is a promising topic in 5G. In this paper, a hybrid network is presented where LTE system at low frequency works for seamless coverage and a mmWave system at 72 GHz works in hotspots for capacity enhancement. The scheme for the hybrid network includes: 1) frame structure and OFDM-based numerology for 72 GHz; 2) time-space beam switching method for...
Spatial consistency is identified as an important feature for fifth generation (5G) channel model. In this paper, a geometry stochastic approach for spatial consistency is presented under the framework of spatial channel model. The extended stochastic channel model (SCM) realizes large-scale parameters(LSPs) and small- scale parameters (SSPs) in a continuous and realistic manner as a function of position...
Beam alignment based on antenna array is a promising technique for millimeter wave communication in 5G. In this paper, we investigate the key parameters design under the framework of a two-layer beam alignment which includes wide beam training and narrow beam alignment. Firstly, an equivalent channel model with variant angles is proposed to simplify simulations. Secondly, the period of beam training...
For the development of new 5G systems to operate in bands up to 100 GHz, there is a need for accurate radio propagation models at these bands that currently are not addressed by existing channel models developed for bands below 6 GHz. This document presents a preliminary overview of 5G channel models for bands up to 100 GHz. These have been derived based on extensive measurement and ray tracing results...
Future mobile communications systems are likely to be very different to those of today with new service innovations driven by increasing data traffic demand, increasing processing power of smart devices and new innovative applications. To meet these service demands the telecommunications industry is converging on a common set of 5G requirements which includes network speeds as high as 10 Gbps, cell...
An important issue for millimeter wave (mmWave) channel model is to introduce variant angles in order to evaluate beam-forming and beam-tracking techniques for mmWave communications. In this paper, we further study the spatial channel model with variant angles (VA-SCM) that has been proposed in [1]. Firstly, VA-SCM model is extended by introducing variant path loss (VA-VP-SCM) in order to describe...
Channel model is the fundamental issue to study and design millimeter wave communications, especially for beam-tracking evaluation where large-scale antenna array is applied. In this paper, a new channel model based on 3GPP spatial channel model (SCM) framework is proposed, which introduces variant arrival and departure angles. A linear variation with time is modeled to describe the angle changes...
Underwater acoustic channel is always a 2-D dispersive channel. For 2-D least-squares channel estimation, the design of training symbols is an open problem. In this paper, (i) we derive the optimal relation between the dimensions of the training matrix and the ffective memory lengths of the equivalent discrete-time channel model, and (ii) we propose a simple algorithm for searching suitable training...
Two transmit antennas placed symmetrically for a linear cell downlink distributed antenna system with Alamouti space-time block coding over Rayleigh fading channels. For mobile station located in different places in the cell, which mode should be selected by base station from one transmit antenna or two transmit antennas? Aiming to solve this problem, a transmit mode selection scheme is developed...
The simulation model of troposcatter scatter channel based on Rayleigh fading is given in this paper. On the basis of comparing with some fading channel models, the statistical characteristics of two kinds of channel models is discussed by analyzing fading behaviors of troposcatter scatter, and random envelopes of different paths and degree of approximation are analyzed. According to the detailed...
In this paper, an efficient power allocation scheme of reference signals (RS) for uplink MU-MIMO in LTE system is introduced. In LTE system, some virtual subcarriers at the borders of the allocated bandwidth are used which invalidates the conventional power allocation schemes for uniformly placed reference signal. Further, RS for multiuser are multiplexed by cyclic shift. Constant power is required...
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