Limited Feedback Strategies and Codebook Design in Coordinated Multiple Base-stations Transmission Systems
多基站协作系统中有限反馈策略及其码本设计

To overcoming some drawbacks for the existing multiple base-stations cooperative systems in which a central control unit and low-latency backhaul links are necessary in order to gather channel state information, a new framework and its signaling properties are discussed that allow cooperative communication on downlink links without the need of substantial modification on the conventional cellular systems. Furthermore, limited rate feedback strategies based on the index of the chosen code are explicitly analyzed, and then codebook design criteria and construction algorithm by adopting the chordal distance are presented. Some results show that the proposed scheme with relatively small feedback overhead improves the system performance significantly, compared to the conventional analog method and the Euclidean distance based quantization method.