| 摘要 |
PROBLEM TO BE SOLVED: To use multiple-input multiple-output (MIMO) techniques to increase spectral efficiency of a cellular single frequency network.SOLUTION: An embodiment is provided with one transmit antenna per cell, and multiple data streams are transmitted from multiple cells, one data stream per set of transmit antennas. Mapping of streams to antenna sets is permuted in time, and thereby, user equipment devices (UEs) at cell edges benefit from MIMO. UEs near cell centers benefit from a high carrier-to-interference (C/I) ratio of a signal. In addition, each stream is concurrently transmitted on base layer of a hierarchically modulated signal from one set, and on enhancement layer of a hierarchically modulated signal from another set. Mapping of sets to streams is permuted in time. The UEs at cell edges benefit from MIMO, and the UEs near cell centers benefit from the high C/I to decode both streams from the base and enhancement layers. |
