Band utilization

Multiple Input Multiple Output ( MIMO ) can increase the capacity of wireless communication system and frequency band utilization without the need of additional bandwidth .

多输入多输出（MIMO）技术能在不占用额外带宽的前提下，成倍地提高通信系统容量和频谱利用率。

The results show that the FFSK has more virtues of phase continuation and higher band utilization than FSK and PSK / DPSK .

结果表明：FFSK调制解调器具有相位连续、包络恒定的特征，频带利用率优于一般FSK和PSK/DPSK。

QAM have some advantages , such as high frequency band utilization rate , good anti-interference ability and so on . It is widely used in mobile communication and satellite communication , especially in the cable digital television transmission .

QAM调制具有抗噪声性强、频带利用率高等特点，被广泛应用于卫星通信和移动通信领域中，尤其适合有线电视电缆传输。

Through measuring , the land , land characteristic frequently when we can observe what frequency spectrum is taken up , find frequency band those utilization ratio low , observe frequency spectrum how utilize at the same time , further prove the advantage of the cognitive radio .

通过测量，我们可以观察到频谱占用的时域、频域特性，找到那些频段是利用率低下的，同时观察频谱是如何利用的，进一步论证认知无线电的优势。

Currently used seismic inversive technology mostly is the way controlled by seismic dominant frequency that makes the potential of relatively higher frequency and lower frequency in useful band without full utilization , so that the inversive results are unsatisfactory .

现今常用的地震反演技术多以地震主频控制反演结果，地震资料有效频带中的相对高频和相对低频的潜力没有充分利用，反演结果也不尽如人意。

Spinel compounds as a kind of new type semiconductor photocatalytic materials , has a narrow forbidden band , high utilization efficiency of visible light , and a wide varieties , which is expected to be more efficient , stable visible light catalysts .

尖晶石型化合物作为一种新型半导体光催化材料，具有带隙能量低，可见光利用效率高，组成结构可调变性大等特点，有望筛选出更为高效、稳定的可见光催化剂。