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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...
Space-frequency block codes (SFBC) combined with frequency switched transmit diversity (FSTD) is used in the downlink of 3GPP LTE system, where all transmit antennas are collocated at eNodeBs. However, all transmit antennas serving a cell are distributed at the cell edge in edge-excited distributed antenna systems. The performance of SFBC is greatly affected by the different large scale fading from...
To obtain the receive diversity of timing acquisition, the cooperative processing of multiple distributed received antennas is considered in this paper. In the flat Rayleigh channels, we assume two remote antennas at the base station for receiving the signal transmitted from the mobile station with a single antenna. By utilizing the coverage range of each remote antenna, a constraint is exploited...
This paper proposes a transmit power allocation scheme for distributed transmit antenna Alamouti space-time block coded (STBC) orthogonal frequency division multiplexing (OFDM) systems using Cholesky decision-feedback detection in the presence of multiple residual frequency offsets (RFOs). Multipath Rayleigh fading is considered, and separate power constraint on each transmit antenna is assumed. The...
In distributed antenna system (DAS), delay spreads between the receiver and each transmit antenna are different due to the unequal propagation delays from distributed transmit antennas to mobile receivers. To exploit the merit of DAS, power spreading in distributed transmit antennas is proposed for OFDM-based MIMO systems over frequency-selective fading channel. In this scheme, partial power of the...
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