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。
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。
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。
While the research shows that the spectrum efficiency of the current license spectrum is very low.
且研究表明当前授权频谱的利用率却非常低。
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。
FQPSK is a modulation technique that fits for high spectrum efficiency and high power efficiency request.
FQPS K是针对高频谱效率和高功率效率要求产生的一种调制方式。
It can provide higher spectrum efficiency by coexistence of primary and CR users at the same region, time, and spectrum band.
它可以提供在同一区域，时间和频段高出小学和CR用户共存的频谱效率。
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。
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。
Furthermore, we analyze the successful communication probabilities of CR users and demonstrate that the spectrum efficiency can be considerably improved by our scheme.
此外，我们分析了成功的CR用户的通信概率和证明的频谱效率可以大大提高我们的计划。
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。
MIMO-OFDM system is a seamless merger of MIMO and OFDM, which can potentially provide larger coverage range, more reliable transmission, higher date rate and spectrum efficiency.
MIMO和OFDM的结合可得到MIMOOFDM系统，它能使提供更大的覆盖范围，更好的传输质量，更大的数据速率和频谱效率。
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。
For the problem of the traditional manual calibration spectrum analyzer calibration need long time, low efficiency, easy to introduce human error.
针对传统手工校准频谱分析仪存在校准时间久、效率低、容易引入人为误差等问题。
This type of code has the similar power spectrum to the original AMI code, and though its code efficiency decreases, rapid synchronization will avoid losing data and increase the credibility of data.
该码型具有和原始AMI码类似的功率谱，尽管其编码效率不高，其快速同步捕获的特性可以避免数据的丢失，提高了数据的可靠性。
Its properties are analyzed, such as code efficiency, error Bit rate, power spectrum, the acquisition probability of the first frame marker.
分析了其特性，包括编码效率、误码特性、功率谱、帧同步一次通过捕获特性等。
A more efficient radio resource allocation and management scheme should be proved to transmit with higher spectrum and power efficiency and higher system performance.
需要研究更加有效的无线资源分配及管理策略，以便在有限的带宽上达到更高频谱效率、更高的发射功率利用率以及更好的系统性能。
The amplitude modulated wave with any modulation factor is discussed in this paper. Its expression, spectrum and formula of the modulation factor, modulation efficiency, SNR gain are given.
本文讨论了调幅系数为任意值的调幅波，给出了它的表达式、频谱及调幅系数、调制效率和信噪比增益的计算公式。
The amplitude modulated wave with any modulation factor is discussed in this paper. Its expression, spectrum and formula of the modulation factor, modulation efficiency, SNR gain are given.
本文讨论了调幅系数为任意值的调幅波，给出了它的表达式、频谱及调幅系数、调制效率和信噪比增益的计算公式。
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