分析了在信道存在加性白噪声和多址干扰的条件下，频带细化对提高频谱利用率的作用。
The effect of bandwidth division on the improvement of the frequency spectrum utilization is analyzed under the condition of the multi-access interference and Gaussian white noise.
日益增长的无线业务需求要求提高衰落信道上无线通信的频谱利用率。
The growing demand for wireless services has created the need for improving the spectral efficiency of wireless communications over fading channels.
盲信道估计算法因完全不需要发送导频或训练序列，提高了系统的频谱利用率，受到了研究人员越来越多的关注。
Because of never needing to send pilot tones or training symbols that can improve the spectrum using efficiency of the systems, blind channel estimation has gotten more and more research attention.
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