| 1. | But when the interference and desired signal ’ s frequency are overlapped , we must use adaptive antenna to separate them in spatial domain
但是当干扰与跳频信号频率相同时，仍会形成干扰。 |
| 2. | In electronics , undesirable low frequency currents interfering with a desired signal , and usually caused by a poorly screened alternating mains supply
在电子学领域，一种不希望发生的低频电流，它干扰所要求的信号。通常这种现象是由于交流供电线路屏蔽不良引起的。 |
| 3. | The results of the simulations show this method can keep the amplitude of the desired signal , restrain the interference signal , and keep the output power of array to minimum
仿真表明，采用自适应算法能够在保证接收方向回波信号幅度保持不变的条件下，抑制干扰信号，且使阵列输出功率最小。 |
| 4. | The desired signals of point targets , point array targets and three - dimensional targets are simulated and analyzed respectively . the simulating results show that the methods proposed can estimate correctly the sar characteristics
最后给出了一个人造三维几何体的模拟图像,并对阴影效果进行了模拟,经过分析该阴影与实际情况相符。 |
| 5. | Beamforming comes from smart antenna with strengthening desired signal and suppressing inter - users interference as its typical technical superiority . it is also the base to realize sdma ( space division multiple access )
波束形成技术源于智能天线、增强期望、抑制用户干扰是其典型的技术优势,也是sdma ( spacedivisionmultipleaccess )能够得以实现的基础。 |
| 6. | Thus , it can ensure no cancellation of the desired signal when minimizing the cm cost function to suppress interference . in this paper , delay - hypothesized matched filter based on minimum kurtosis criterion is used to initialize code - constrained cma
通过对均衡器的权向量增加约束，使其在迭代更新最小化代价函数时，能在有效抑制干扰的同时保证期望用户信号不被抑制。 |
| 7. | Digital signal processing technologies were used to produce spatial and directional beam in adaptive antenna . then the main beam aims at the coming direction of desired signal and the side lobe points to the coming direction of interference signals
自适应天线利用数字信号处理技术，产生空间定向波束，使天线主波束对准期望信号到达方向，旁瓣或零陷对准干扰信号到达方向。 |
| 8. | Unwanted electrical energy in a circuit that is unrelated to the desired signal , s - ources of noise are most often generated by some type of switching circuit , common sources include switching voltage regulators and clocked sighals such as digitol crcuits
指在一电路中与所要讯号无关的多余电能，杂讯的来源通常为某些形式的切换电路，常见的杂讯为切换式电压，调整器及时脉讯号，如一些数位电路。 |
| 9. | The multistage constant modulus ( cm ) array is a cascade adaptive beamforming system that can recover several narrowband co - channel signals without training . the main idea of the smi - cma is to use smi to determine the initial weight for cma operation . the method can come up with the desire signal in despite of the interfering signal is stronger than the desire signal
基于以上考虑，我们提出了基于smi - cma联合自适应方法，该算法可以分离多个同信道信源，由smi算法决定cma算法的初始权向量，在干扰信号较强时，仍有稳定的sinr输出，具有较快的收敛速度。 |
| 10. | A novel communication receiver which uses lapped transform ( lt ) incorporating modified median filter ( mmf ) algorithm is designed for narrow - band interference excision . the lt domain mmf algorithm takes full advantages of the direct sequence spread spectrum signal , as well as the characteristics of lt , performing the transform domain filtering twice . the first filtering locates the position of interference and mitigates most of them . the second filtering is performed in a small neighborhood of the located interference . so lt domain mmf algorithm can completely mitigate the interference without distorting the desired signal . simulation results demonstrate the improved ber performance and increased robustness of our receiver
本文采用改进的重叠变换域中值滤波算法进行变换域抗干扰处理.该算法既考虑到直接序列扩频信号的特点，同时又利用重叠变换的特性对变换域系数进行了二次滤波.该算法节省处理时间，并且不需要有关干扰的先验知识，系统性能不会随干扰频率变化而变化，因而是一种很稳健的处理方法 |
