码元

对于带通系统而言，最高码元速率为2WBaud，此时可获得的最高频带利用率为2Baud/Hz。

For band-pass , the highest code element rate is 2W Baud , and the gettable highest rate of frequency band is 2 Baud / Hz .

一种用于对数据进行编码的装置，按下键钮就可以产生选定的码元。

A device used to encode data by key depression , which causes generation of the selected code element .

利用码元约束技术消除OFDM系统中的限幅噪声

Clipping noise cancellation in the OFDM system using the code restriction technique

码元定时和频率偏差估计是OFDM系统的关键技术之一。

Symbol timing and frequency offset estimation are key techniques in OFDM systems .

可变速率QPSKModem中码元定时恢复电路的研制

Development of Symbol Timing Recovery Circuit for Variable Rate QPSK Modem

一种优化的MMSE码元数字解调判决算法

An Optimized Judgment Algorithm of Code Digital Demodulation Based on MMSE Theory

提出了一种以FPGA为核心，外围控制电路与D/A转换电路相结合的方法实现的IRIG-BDC码和AC码元的设计，重点分析了FPGA内部模块的具体实现过程。

A design of IRIG-B DC and AC time code based on FPGA is given and the implement of FPGA module is analyzed .

CPM信号引导码元辅助检测方案

A Pilot symbol aided detection Scheme of CPM Signal

Huffman码在码元时间单位不同时的最优性研究

Research in the Huffman coding when 0 、 1 with different time

根据扩频码的自相关和互相关特性，采用基带迟&早门实现扩频码跟踪的方案，使得接收PN码与本地PN码相位差保持在一个码元的几分之一内；

According to correlative characteristic of PN codes , early-late gate base-band loop is used for PN codes tracking .

在背景建模阶段，首先基于特征向量建立多层块码本模型，然后基于MeanShift理论建立多层像素码本模型，在这两个码本模型中，为每个码元都增加了权重系数。

In the background modeling stage , we build the multi-layer piece model based on feature vector first , and then build the multi-layer pixel model based on Mean Shift .

部分相关ML算法首先利用子空间分解技术动态跟踪多径信道变化，再实时计算出最佳相关长度用于码元定时和频率偏差估计。

The partial correlation algorithm tracks maximum multipath length by subspace decomposition and calculates optimal correlation length subsequently for symbol timing and frquency offset estimation .

一种基于MMSE准则的通用码元同步算法

An Universal MMSE Software Synchronized Algorithm

基于循环谱包络的BPSK信号码元速率改进估计算法

Innovatory Estimation Algorithm of BPSK Signal Chip-rate Based on Cyclic Spectrum Envelope

一种动态多卜勒环境下的BPSK载波与码元同步技术

A BPSK Carrier and Bit Synchronization Technology in the Presence of Dynamic Doppler

DPSK信号多码元差分检测的低复杂度实现

A Novel Multiple Symbol Differential Detection of DPSK with Low Complexity

MPSK信号的循环谱检测及码元速率估计

Detection and chip rate estimation of MPSK signals based on cyclic spectral density

带限MPSK信号码元宽度的盲估计

Blind Estimation of Code-width for Bandlimited MPSK Signals

介绍利用VB设计并实现的以稀土能量上转换材料为码元的一种隐形多彩色一维条码的打印系统。

The Design of the printing system for a latent multicolor barcode based on the rare earth energy up-conversion material by visual basic program is presented .

一种新的跳频宽带瑞利衰落信道模型以每秒1M个码元的字符速率传输，充分利用信道的最大有效带宽。

New model for frequency hopping wideband Rayleigh fading channels 1Ms / s symbol rate exploits maximum available channel bandwidth .

一种短波高速QAM信号快速无抖动码元同步方案的设计

Design of Jitter-Free Timing Recovery Scheme with Fast Tracking Capability for High Speed QAM Signal over HF Channel

本文讨论Huffman编码后的码流中0、1码元（二进制情况下）出现的概率问题。

This paper discusses the problem of the probabilities of 0,1 bits in codeword stream after Huffman coding .

本文采用基于内插及数字PLL的码元同步器结构，很好地解决了上述问题。

In this thesis , we present a symbol synchronizer based on digital PLL and interpolation , which avoids the disadvantages mentioned above .

基于MATLAB的互补累积分布函数和误码率的仿真结果表明，码元约束技术和传统限幅的结合不仅降低了高峰均功率比，而且很好地改善了误码率性能。

The code restriction technique and clipping are combined to achieve higher PAPR reduction and better BER , which can be seen from the simulation results of CCDF and BER based on MATLAB .

由于CPM信号固有的记忆效应，传统的引导码元编码规则对它不适用。

However , because of the inherent memory effect of CPM signal the traditional pilot symbol encoding rule is not feasible .

面向无线应用的OFDM系统设计中必须要面对一个问题，那就是通过通信介质传输的信号码元总会受到信道的干扰。

One problem that must be faced in the design of wireless OFDM systems is that the signal symbols are interfered by the channel when transmitted through the communication media .

COFDM符号中的每个比特对映射成一个DQPSK码元；

Mapping the suit of bits in the COFDM symbols into the DQPSK symbols ;

按照频率交织规则表，找到该DQPSK码元对应的那个载波；

Finding out the carrier corresponding the DQPSK symbols according to the frequency interleaving table ;

该算法采用先进先出队列并结合HDB3编码规律进行码元矫正。

FIFO is adopted according to HDB_3 coding and its distortion waves in the rectification .

鉴于传统的各种残余码元间干扰（ISI，Inter-symbolInterference）均衡方案都存在着高计算复杂度的缺点，本文提出三种低计算复杂度均衡方法。

Considering that conventional residual inter-symbol interference ( ISI ) equalization techniques have the drawback of high computational complexity , three low-complexity methods are presented in this thesis .