您要查找的是不是：
- OFDM has been paid much attention to for its high spectrum efficiency and strong immunity to interference. OFDM技术以其频谱利用率高，抗干扰能力强等优点而得到广泛的关注。
- Quadrature amplitude modulation(QAM)is a way of carrier transmission that has high spectrum efficiency and is easily implemented. 正交幅度调制(QAM)是一种频谱利用率高、实现较为方便的载波传输方式。
- Orthogonal Frequency Division Multiplexing (OFDM) has high spectrum efficiency and capability to mitigate the side-effect of multipath propagation. 正交频分复用(OFDM)技术由于具有较高的频谱效率,而且可以有效地对抗多径传输,已成为高速数据传输的关键技术。
- In order to improve the spectrum efficiency of wireless channel, header compression schemes are used to reduce the TCP/IP protocol header size in wireless IP networks. 摘要在无线IP网络中，采用报头压缩技术减小TCP/IP协定报头带来的额外开销，提高无线通道的频谱利用率。
- A MIMO-OFDM system is a seamless merger of MIMO and OFDM, which can potentially provide larger coverage range, more reliable transmission, higher data rate and spectrum efficiency. 因此，OFDM技术和MIMO技术的结合可以提供更大的覆盖范围，更好的传输质量，更大的数据速率和更高的频谱效率。
- The SDMA (Spatial Divided Multi-Area) based on AAA can enhance the conventionalmulti-area techniques, e.g., TDMA, FDMA & CDMA, so the spectrum efficiency canbe improved and the capacitance of the communications system can be increased. 基于自适应阵列天线的空分多址（SDMA）技术，是传统的时分多址（TDMA）、频分多址（FDMA）和码分多址（CDMA）的一种多址倍增技术，可进一步提高频谱的有效利用率，增大系统容量。
- Simulation results suggest that, in equilateral triangle cell structure, the performance of LDC is obviously better than OSTBC and VBLAST in a variety of spectrum efficiency and decoding algorithms. 在不同的信道环境，不同的频谱利用率和不同的解码算法条件下，分别比较了三种空时编码方案的性能。
- The survey covered a broad spectrum of topic. 这本简史涉及的话题范围很广。
- We must improve our efficiency as soon as possible. 我们必须尽快地提高工作效率。
- Systems with improved spectrum efficiency for the land mobile service 陆地移动业务的提高频谱效率的系统
- Their labor efficiency is very high. 他们的工作效率很高。
- We were most impressed with/by your efficiency. 你的工作效率很高，我们极为钦佩。
- Red and violet are at opposite ends of the spectrum. 红色和紫色位于光谱相对的两端。
- Our goal is to achieve the maximum of efficiency. 我们的目标是取得最高的效率。
- A diploma is no guarantee of efficiency. 持有文凭不能保证工作效率一定高。
- We must concentrate our attention on efficiency. 我们必须把注意力集中在效率上。
- An efficiency expert on loan from the main office. 从总公司借调的一个效率专家
- There's a wide spectrum of opinions on this problem. 对这个问题的说法众说纷纭，莫衷一是。
- His illness has impaired his efficiency. 生病降低了他的效率。
- In the spectrum, distinct colours shade into each other. 在光谱中，截然不同的颜色相互融合起来。
