García-Zambrana Antonio, Castillo-Vázquez Beatriz, Castillo-Vázquez Carmen
Department of Communications Engineering, University of Málaga, Málaga, Spain.
Opt Express. 2010 Sep 13;18(19):20445-54. doi: 10.1364/OE.18.020445.
A new upper bound on the capacity of power- and bandwidth-constrained optical wireless links using selection transmit diversity over exponential atmospheric turbulence channels with intensity modulation and direct detection is derived when non-uniform on-off keying (OOK) formats are used. In this strong turbulence free-space optical (FSO) scenario, average capacity is investigated subject to an average optical power constraint and not only to an average electrical power constraint when the transmit diversity technique assumed is based on the selection of the optical path with a greater value of irradiance. Simulation results for the mutual information are further demonstrated to confirm the analytical results for different diversity orders.
当使用非均匀开关键控（OOK）格式时，推导了在强度调制和直接检测的指数大气湍流信道上采用选择发射分集的功率和带宽受限光无线链路容量的新上限。在这种强湍流自由空间光（FSO）场景中，研究了平均容量，其受平均光功率约束，而不仅仅是当假设的发射分集技术基于选择具有更大辐照度值的光路时的平均电功率约束。进一步展示了互信息的仿真结果，以证实不同分集阶数的分析结果。
