典型电缆连接器的装配质量控制措施

电缆连接器广泛应用于航空航天、军工、电子产品等领域,为了保证产品的质量,提高产品的可靠性,有必要对其进行研究.主要介绍了XKE型和SCSI型及J30J型电缆连接器的特性、用途和装配工艺控制措施.通过实际应用,取得了较好的效果.     

双路高速高增益光电耦合器

本文叙述了双路高速高增益光电耦合器的元件选择、结构、工作原理、基本特性和应用。     

OFDM系统中基于部分传输序列圆周移位最优和的降低峰值平均功率比的算法

本文针对正交频分复用（ＯＦＤＭ）系统提出了一种新的非常有效的降低其峰值平均功率比的方法．它基于求解ＯＦＤＭ系统部分传输序列圆周移位的最优和,同以前的基于部分传输序列最优组合的方法相比,在同样的条件下针对不同的ＯＦＤＭ系统,新算法的性能均有不同程度的提高,在实际应用中可以完全取代老的算法．     

一种改进的语音识别词错误率评估算法

在建立语音识别系统的过程中错误率评估起着非常重要的作用,传统的词错误率算法仅仅是基于最小错误率,具有显著的缺陷,因而不能准确评估系统的错误率。提出一种改进的基于最小错误率和时间信息的词错误率评估算法,能够准确评估系统的错误率,为声学模型的优化提供指导。同时列举了该评估算法在建立语音识别系统过程中的应用。     

基于微溶技术的高温压力传感器

本文主要以综述的方式简单的介绍了一种用微溶玻璃技术制作新一代压力传感器的原理、结构以及补偿电路,最后总结了微溶压力传感器的特点及优越性,可剔除了用传统工艺方法生产传感器带来的弊端,理论上可以完全替代陶瓷、应变片、溅射薄膜及充油芯体等技术。     

浅谈室内分布系统WCDMA网络的底噪问题及处理方法

室内分布系统由于直放站、无源器件的引入,多系统合路等原因,易造成WCDMA基站底噪抬升,直接影响室内分布系统的覆盖效果、话务容量及数据业务速率.简要分析了室内分布系统底噪产生的原因,并通过案例讲解几种常见底噪抬升问题的处理,有效降低底噪,提升WCDMA网络服务质量.     

基于梯度的HEVC自适应码率控制算法研究

针对新一代视频编码标准HEVC中的码率控制问题,提出了一种基于梯度的自适应码率控制算法.算法的主要特点是自适应获取每个LCU的梯度来表示其复杂度,根据复杂度分配LCU层目标比特.同时,在分配帧层目标比特时利用缓冲区的状态信息,以使编码器输出的实际码率更符合给定的目标码率,并使缓冲区滞留的数据尽量少,即传输时延尽量小.实验结果表明,该算法与标准的HEVC码率控制提案K0103相比,缓冲区滞留数据量平均减少约39.31％,峰值信噪比平均提高约0.54 dB,同时实际码率与目标码率之间的码率偏差平均降低约0.39％.     

手机主流数据业务的基准速率测试分析

近年来移动互联网业务的快速发展,手机上网业务已经成为中国移动核心增量业务,不同的移动数据业务也成为了影响业务质量及用户感知度的重要因素,而且业务不同用户的感知需求也不同,所以需要构建新的手机上网业务评估体系评价不同业务的指标,从而辅助网络优化工作。但以往单纯的平均下载速率并不能完全反映业务标准,基准速率之上的相关指标统计更能够反映网络对用户流量业务需求的满足情况,本文就详细介绍了在TD-SCDMA和LTE网络下主流数据业务用户的基准速率的测试分析情况。     

Low complexity encoder optimization for HEVC

High Efficiency Video Coding (HEVC) improved the coding efficiency significantly. Compared to its predecessor H.264/AVC, it can provide equivalent subjective quality with more than 57% bit rate reduction. However, the improvement on coding efficiency is obtained at the expense of much more intensive computation complexity. In this paper, based on an overall analysis of computation complexity at the HEVC encoder, a low complexity encoder optimization scheme is proposed by reducing the number of available candidates for evaluation in terms of the intra prediction mode decision, early termination of coding unit (CU) splitting and adaptive reference frame selection. With the proposed scheme, the rate distortion optimization (RDO) technique of HEVC can be implemented in a low-complexity way for complexity-constrained encoders. Experimental results demonstrate that, compared with the original HEVC reference encoder implementation, the proposed optimization scheme can achieve more than 40% complexity reduction on average with coding performance degradation as only 0.43% which can be ignorable.     

The Economical PAPR Minization Scheme for Combinative Coding Technique Applied OFDM Communication System

In this paper, we propose a new combinative scheme to combine with parity check and block coding methods for the reduction of the peak to average power ratio (PAPR) of orthogonal frequency division multiplexing (OFDM) system. In the proposed schemes, the simulation results shown that Peak-to-Average Power Ratio (PAPR) can be reduced by 3.502 dB. The results of this mapped can be shown that PAPR is reduced. The principle of the scheme is illustrated with the specific example of an eight-carriers signal and its computer simulation results. All simulation results have compare with ideal channel case and AWGN case separately; both of cases are shown the PAPR reduced indeed. Do Horng Guo received his B.S. Degree in Electronic Engineering from National Taiwan Marine Science University, Keelung, Taiwan, in 1983, and M.S. Degree in Computer Communication from Northrop University, Los Angeles, USA, in 1986. He is enrolled in Ph.D program in Graduate Institute of Communication Engineering of Tatung University from 2001. His current interest includes wireless communication system and digital signal processing. Chau-Yun Hsu received his B.S. degree M.S. and Ph.D in Electrical Engineering from Tatung Institute of Technology, Taipei, Taiwan, in 1981, 1983 and 1988, respectively. He was the lecturer in Department of Electrical Engineering of Tatung University from 1983 to 1985. From 1988 to 1997, he served as the Associate professor of Tatung University. Since 1998, he has been the Chair Professor of Graduate Institute of Communication Engineering of Tatung University. Now he is also the chair of department of Electrical Engineering of Tatung University. His current interest includes Wireless Channel Model and Estimation, Machine Learning, Digital Signal Processing and Image Processing.