Cognitive radio is interested because this technique can increase spectrum efficiency.
认知无线电技术因其提高频谱利用率的能力而广受关注。
AS a scheme of MIMO, VBLAST can provide extremely high spectrum efficiency.
作为MIMO系统的一种实现方案，VBLAST可以获得很高的频谱利用率。
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。
But this method occupies the special sub-carriers or time slots and then reduces the system spectrum efficiency and data transmission rate.
但该方法占用专门的子载波或时隙，降低了系统的频谱利用率和信息传输速率。
On the other hand, adaptive modulation technique can enhance data rate, spectrum efficiency and transmission reliability in MIMO-OFDM systems.
另一方面，对于MIMO - OFDM系统来说，自适应调制技术可以提高系统的数据传输率、频谱效率以及传输的可靠性。
Adaptive antenna array is an approach that shows real promise for increasing spectrum efficiency.
阵列天线是提高频谱利用率一种可实现的方法。
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。
This new scheme has the advantages of high spectrum efficiency and suppression of multipath spread, frequency selective fading, jamming and noise.
该体制具有较高的频率利用率，可有效地抑制短波信道中多径时延、频率选择性衰落、人为干扰与噪声带来的不利影响。
Therefore, it has a practical significance to develop some fit methods of modulation with high spectrum efficiency for shortwave FH communication system.
因而，研究适合于高速数据传输的跳频通信特点且具有高效频谱利用率的调制技术具有重要的实际意义。
The biggest merit of OFDMA is the ability to resist frequency - selective fading, simultaneously can raise the frequency spectrum efficiency effectively.
OFDMA的最大的优点是能够抵抗频率选择性衰落，同时能够有效地提高频谱效率。
The next generation mobile communication systems will have higher spectrum efficiency, higher transmission rate, and provide multimedia services to the users.
下一代移动通信系统是一个高频谱利用率、高传输速率，并可提供多种服务的无线网络。
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。
Simulations result show that this algorithm can lower capacity loss of authorized user efficiently and improve spare spectrum efficiency, make access decision more efficiently.
仿真结果表明：该算法有效地降低了授权用户的容量损失，提高了空闲频谱的利用效率，能够更有效地做出接入决策。
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。
Modern FH communication system need transmit a mass of data, traditional modulations are no longer suitable for high-speed data transmitting in FH system due to low spectrum efficiency.
现代跳频系统需要传输大量数据信息，传统调制方式由于频谱利用率低而不适合跳频系统的高速数据传输。
Finally, the simulation shows that the proposed algorithm can reduce the interference temperature estimation valuation and improve spectrum efficiency under the directed communication conditions.
通过仿真验证了所提算法在有向通信背景下可以降低干扰温度估值，提高频谱使用效率。
Simulation results show that this algorithm can lower the capacity loss of authorized user efficiently and improve spare spectrum efficiency, moreover, it can make access decision more efficiently.
仿真结果表明：该算法有效降低了授权用户的容量损失，提高了空闲频谱的利用效率，能够更有效地做出接入决策。
Simulation results show that this algorithm can lower the capacity loss of authorized user efficiently and improve spare spectrum efficiency, moreover, it can make access decision more efficiently.
仿真结果表明：该算法有效降低了授权用户的容量损失，提高了空闲频谱的利用效率，能够更有效地做出接入决策。
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