| 1. | Current analyses of the watermarking channel are typically limited to the additive white gaussian noise ( awgn ) channel
当前典型的水印信道分析被限制在加性白高斯信道上。 |
| 2. | In the presence of additive white gaussian noise , an adaptive wavelet - based de - noising algorithm for speech enhancement applications is proposed
针对加性高斯白噪声的情况，提出一种自适应小波降噪算法，用于语音信号的增强。 |
| 3. | In awgn ( additive white gaussian noise ) channel , we introduce a new single - tone interference suppression scheme in the single - tone interference environment
针对加性白高斯噪声信道中的发射信号,提出了利用单音信号频域特性的单音干扰抑制方法。 |
| 4. | Subsequently the channel was modeled for three types namely additive white gaussian noise , flat fading and frequency selective fading . lastly , the receiver was studied
接下来信道建模成三种不同的类型，即加性高斯白噪声信道、平坦衰落信道和频率选择性衰落信道。 |
| 5. | Sinusoidal frequency estimation is the procedure which can estimate the frequency of sinusoidal waves in additive white gaussian noise through transform and calculation for signal ' s samples
正弦信号频率估计是指通过对信号采样值的计算和变换，估计出淹没于噪声中的信号的频率的过程。 |
| 6. | In additive white gaussian noise ( awgn ) channel , we introduce a method for synchronization of symbol timing and frequency for two - dimensional spread spectrum system without prior knowledge of spread spectrum matrix
摘要针对加性白高斯噪声信道，考虑未知二维扩频矩阵的条件下，提出了一种二维扩频系统的时频同步方法。 |
| 7. | And the output components of the despread correlator under the condition of additive white gaussian noise ( awgn ) are analyzed to derive the expressions for the false alarm probability and the detection probability
同时也对解扩相关器在接收端噪声为加性白高斯噪声情况下的输出成分进行了详细分析，推导得出大步进搜索的虚警概率和检测概率的公式。 |
| 8. | Deriving formulas of map algorithm and its modified algorithms in the log domain ( including max - log - map and log - map ) , and simulating the performances of turbo codes over additive white gaussian noise ( awgn ) . 2
详细推导了map译码算法，以及map算法在对数域中的修正算法( max - log - map和log - map算法) ，并对turbo码在高斯白噪声信道下的性能进行了仿真分析。 |
| 9. | That is by inserting known symbols or pilots in time and frequency domain to estimate the channel frequency response . the proposed method employs iterative low - pass filtering in transform domain which can reduce additive white gaussian noise and inter - carrier interference effectively
该估计算法采用在变换域多次迭代滤波的方式,能够显著降低高斯噪声和载波间干扰( ici )对估计性能的影响,同时快速fft算法也使得变换域滤波变得比较简便。 |
| 10. | Turbo codes represent the new code structures , which consist of pccc ( parallel serially convolutional code ) and sccc ( serially concatenated convolutional code ) . in this paper , the background of turbo codes are firstly introduced , which includes the base principle of error correction code 、 block code and convolutional code ; the principle of turbo code and the iterative decoding is secondly expanded ; the key decoding algorithm : a revised map algorithm and iterative decoding theory are detailed ; then , a new turbo code structure : hccc ( hybrid concatenated convolutional code ) is presented , and the capacity of this code method is analyzed , the average capacity upper bound is derived ; at last , this code is simulated on awgn ( additive white gaussian noise ) channel and rayleigh fading channel
本文首先介绍了turbo码的背景知识，包括差错控制的基本原理、分组码和卷积码；然后阐述了turbo码的基本原理，包括turbo编译码器结构及迭代译码原理；较为详细地描述了关键的译码算法： ?种改进的最大后验概率( map )译码算法及迭代译码算法；提出了一种新的turbo码结构：混合turbo码(混合级联卷积码) ；并用编码性能联合界分析方法对混合turbo码进行了性能分析，得出了其平均性能上界；并在高斯白噪声信道和瑞利衰落信道上分别作了一些应用研究及计算机仿真实验。 |
