Similarly, the high power efficiency also needs to sacrifice certain frequency spectrum efficiency.
同样，高的功率效率也要牺牲一定的频谱效率。
The traditional CDMA technology has serious multi address interference phenomenon, so the frequency spectrum efficiency of the channel can′t reach the optimal state.
传统的CDMA技术存在严重的多址干扰现象，使得信道的频谱效率不能达到最佳状态。
It spurs us to develop highly efficient coding, modulation and signal processing techniques to improve the wireless frequency spectrum efficiency.
这种挑战使得人们努力开发高效的编码、调制以及信号处理技术来提高无线频率的效率。
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