信噪比

Simulation results shown for QPSK and 8-PSK, demonstrate that the new estimator clearly performs as well as the best SNR estimator in each SNR range.

仿真结果表明，这种新的估计算法在更大的信噪比范围内的表现要优于其他现存的估计算法。

The performance of EFT is investigated, which indicates that time-frequency distributions using single-sided window could not accurately trace the variation of the instantaneous frequency, since their performance depend only on the history of the signal, so they are biased frequency estimator.

提出了基于对称阵元互Wigner分布平均的瞬时频率估计算法，这种方法利用多通道数据对时频分布的瞬时频率估计方法的性能进行了有效的改善，并且能够在低信噪比的条件下获得良好的估计效果， 6。

SNR maximum likelihood estimator based on data directed decision was evaluated first, and was concluded as a biased estimator. An unbiased estimator can be acquired through high order moments of received data.

摘要通过对基于判决反馈的信噪比最大似然估计推导过程的分析，得出：判决反馈最大似然估计得到的估计值是有偏估计；利用基带数据的高阶矩特性，可以获得渐近无偏估计。

The influence of background light, reverse biasing voltage and feedback resistance on the performance of APD detection circuit is analyzed in detail.

实验表明：根据该方法设计的前放接收模块使测距仪接收系统获得最大信噪比， APD工作在最佳倍增状态，从而提高测距仪的探测灵敏度和最大测程。

I have never experienced a blacker presentation, it's truly remarkable the way notes.

信噪比是Hi-End的特点，我从来没有过这种宁静的音质重放的经验。

BMEICS synthesizes the character of block motion estimation and that of global search, diversity, and no prone to premature in immune clonal selection. It speeds up the process of motion estimation while maintaining the average with little loss.

该方法将块匹配运动估计问题的性质与免疫克隆选择算法所具有的全局搜索特性、解的多样性和不易早熟的特点相融合，在能够获得接近全搜索方法所得到的平均峰值信噪比的前提下，使得平均搜索点数大为降低。

With Boxcar dealing with the signal, the SNR was improved more.

同时采用Boxcar积分器对测量信号进行多次累加平均，进一步有效地提高了信噪比。

The relationship between the changes of radio-frequency signal frequency and Bragg diffraction angle is analyzed, spatial filtering characteristic resulted from acousto-optic deflection effects is discussed.

实验表明，采用波长为630 nm的单频激光，带宽为200 MHz的声光偏转器，其频率分辨率优于1 MHz，频率信号的空间分离效果明显，接收灵敏度和信噪比得到改善。

A detection method based on phase correlation uses a phase difference as the statistical quantum to detect double frequency carrier signal for BPSK DS/SS signals, it has the advantage of the rapid detection and can work well under low SNR condition.

基于相位相关的检测方法把相位差累积量作为检验统计量，通过检测载波二倍频信号来实现对BPSK DS/SS信号的检测，具有检测迅速并能够在低信噪比条件下工作的优点。

In OFDM system, the information of channel state information is defined as Signal-to-Noise for position of carrier wave.

在OFDM系统中，信道状态信息定义为载波位置的信噪比，采用归一法计算平均噪声功率以获取信道状态信息。

Plunder melds and run with this jewel!

掠夺melds和运行与此宝石！

My dream is to be a crazy growing tree and extend at the edge between the city and the forest.

此刻，也许正是在通往天国的路上，我体验着这白色的晕旋。