Distributed Antenna Systems and Their Applications in 4G Wireless Systems

Distributed antenna systems (DAS) are traditionally deployed for the coverage purpose, where multiple antennas connected with a common source are geographically separated within the cell. In order to provide high rate services in the 4G wireless system, DAS should be further enhanced with the help of advanced MIMO techniques. In this paper, we start with reviewing the typical scenarios for DAS, which are widely discussed in standardization. Then, the benefits of DAS with single antenna selection (SAS) are analyzed. Based on this, a DAS transmission mode compatible with 3GPP Long Time Evolution (LTE) Release 8 standard is proposed. According to the system level simulation, the cell average and cell edge throughput can be improved by 35.0% and 82.3% respectively, compared with LTE Release 8 system. Moreover, the total transmitted power can be reduced by 75%.