码本

Correlative numerical simulation was implemented,and the results show that the combination of RS and TCM codes can enhance optical PPM communication performance assuringly.

模拟研究了在不同空间光信道条件下，传统RS码的符号正确传输率和误码率，并对网格编码调制的编码增益、RS码与网格编码调制级联时的编码增益进行了仿真研究，证实了本方案的有效性。

On the other hand, as Pecorra and Carrol demonstrated in 1990 that is able to synchronize chaotic systems, many chaos synchronization schemes have been proposed in the literatures.

本论文中基于一个简单的分段线性映射设计了混沌跳频码，计算机仿真表明它具有好的平衡特性、汉明相关特性和大的跳频间隔，用于混沌通信系统中是一个好的混沌跳频码。

The main topics include entropy and mutual information, data compression, noiseless coding, Shannon theorem, noiseless coding, Shannon Theorem, linear codes, cyclic codes.

本课程宗旨是简介基础的资讯理论，主要课程含嫡及相互信息、资料压缩、无杂讯编码及Shannon定理、线性码、循环码等。

This invention relates to one MIMO-OFDM system simultaneous method, which comprises the following steps: a, processing relative computation by received local sequence and local ones to get relative peak and its side; b, processing filter on peak value and sides through one degree impact without limit; c, in the non integral digital sampling, the said peak value and its side are ordered to keep their position as time lag information; d, in the integral code sampling, it orders the peak value and its side and removes the sides and keeps relative peak position as time lag position to realize the simultaneous process.

本发明公开了一种MIMO-OFDM系统的同步方法，所述方法包括步骤：(1)将本地序列与接收到的序列进行相关运算，得到相关峰值及其旁瓣；(2)将所述相关峰值及其旁瓣通过一阶无限冲击响应数字滤波器进行滤波；(3)当所述MIMO-OFDM系统处于非整数倍码片抽样时，对所述相关峰值及其旁瓣进行排序，保留相关峰值及其旁瓣相应位置作为时延位置信息；(4)当所述MIMO-OFDM系统处于整数倍码片抽样时，对所述相关峰值及其旁瓣进行排序，并去除相关峰值旁瓣，保留相关峰值位置作为时延位置信息，从而实现同步。

In the second part of this dissertation, we focus on the RRM issues in the MC-DS-CDMA systems, including power control, code admission, and subcarrier power allocation.

在本论文的第二部份中，我们则探讨了多载波直接序列分码多重接取系统中之功率控制、码通道分配以及子载波功率分配之无线电资源管理议题。

The invention is simple and applied, and it has good regularity, can solve difficulty of binary syllabification position or achieving difficulty on mini key-board, it produces little repeated code, especially no syllabic repeated code on mini key-board, it can be used on computer and handset, efficiency can be improved greatly.

本发明简易实用、极具规律性，能解决双拼键位定义难，或在小键盘上难以实现的问题，重码极低，尤其小键盘无音节重码，可在电脑手机等产品上广泛应用，极大提高效率。

The main tasks of this design are to acquire and identify image of QR Code in high speed, based on the research on international symbology spe...

本设计的主要任务是在研究二维条码的码制标准的基础上，实现对二维条码QR码的高速采集与识别。

The synchronization method of PN sequence for the need of fast acquisition and tracking in telemeter is presented.

为了满足设计中伪码快捕的需要，通过分析常见的伪码同步方法，确定了本系统采用的伪码快捕和跟踪方案。

In this algorithm, by initially setting a larger threshold of rate-distortion slope and marking the channels that their rate-distortion slopes are larger than the thresholds in each coding block as "selected state", and then decreasing the threshold step by step until the sum of the rate of those selection exceeds the predefined rate limitation, an approximate optimal truncation point will be obtained.

本算法通过初始设置一个较大的长度－失真斜率阈值，将每个编码块中长度－失真斜率大于该阈值的通道置为"选入"状态，逐次减小该阈值并重复上述过程，直到状态为"选入"的通道的累积码流长度大于设定的码流长度，得到近似的最优截断点，再采用舍弃最小斜率的方法获得最优截断点以实现码率控制。

Although vocoder can transmitter speech signal at very low bit rate, it does not work well when dealing with audio signal.

在本学位论文中我们设计了一种低码率音频编码器。对于很多不同类型的音频信号，它可以工作在很低的码速率上，虽然此时它所提供的听觉质量不是透明的，人们仍然可以接受。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。