spectral efficiencies的用法和样例：
例句
- Simulation results show that the spectral efficiency is improved and the outage probability is decreased in the proposed joint algorithm.
仿真结果表明，本文提出的联合算法具有较高的频谱效率和较低的中断概率。 - The author has described several key techniques for improving the capacity of CDMA digital celullar system,comparing to the spectral efficiency of FDMA and TDMA cellular system.
本文对照频分多址和时分多址系统的频谱效率，阐述了码分多址系统提高系统容量的几项关键技术。
