spectral efficiencies的用法和樣例：
例句
- Simulation results show that the spectral efficiency is improved and the outage probability is decreased in the proposed joint algorithm.
模擬結果表明，本文提出的聯合演算法具有較高的頻譜效率和較低的中斷概率。 - 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.
本文對照頻分多址和時分多址系統的頻譜效率，闡述了碼分多址系統提高系統容量的幾項關鍵技術。
