实际上高输入阻抗的变压器，它们的效率和频带宽度都会下降。
At high input impedances, in practice both efficiency and bandwidth of a transformer will reduce.
联合频率相位调制(JFPM)同时利用频率信息及相位信息，具有较高的频带利用率和功率效率。
Joint frequency and phase modulation (JFPM) utilize frequency and phase information to realize higher efficiency in the frequency and power.
与传统的复用式导频相比，叠加导频具有频带利用率高，传输效率高的优点，因而受到了广泛关注。
In comparison with the multiplex training scheme, superimposed pilot has the advantage of efficient bandwidth and high information rate, thus become more and more attractive.
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