Reversed Time Slot Configuration in TDD-CDMA Overlay Systems for Enhanced Downlink Throughput

摘要

With TDD-CDMA, each layer of overlay systems can re-use the same frequency band, and therefore an efficient frequency usage is achievable while overlay networks may interfere with each other. In this paper, we propose a novel time slot configuration over the TDD-CDMA overlay system aiming at high-speed DL access. In our system, micro base stations (microBSs) are equipped with directional antennas to alleviate the strong BS-microBS interference, and AMC is used to gain the synergy effect between the proposed slot configuration and AMC. Using computer simulation, we show largely increased DL network and user throughputs but slightly decreased uplink throughputs.