ID 原文 译文
14635 在高速通信系统中,由于多径信道通常存在一些小的散射体,使得抽头向量不满足理想的稀疏特性,导致经典的稀疏估计算法存在一定的性能损失。 In high speed communication systems,there are some small scatterers in multipath channel,so that the tap vector does not have ideal sparse characteristics,leading to some performance loss to sparse es. timation algorithm.
14636 针对上述非理想稀疏特性问题,提出了一种基于酉变换近似消息传递(Unitary Transform Approximate Message Passing,UT-AMP)和加权高斯(Weighting-Gaussian,WG)先验模型的稀疏估计算法。 A sparse estimation algorithm based on unitary transform approximate message passing(UT-AMP)and weighting-Gaussian(WG) prior model is proposed to solve the such problem.
14637 首先,由非理想稀疏信道的构造分析,导出了WG先验模型和参数; The algo. rithm firstly analvzes the construction of non-ideal sparse channel and introduces the WG prior model.
14638 其次,利用贝叶斯公式对正交频分复用(Orthogonal Frequency Division Multiple-xing,OFDM)系统进行因式分解和因子图建模,归纳了在消息传递框架内期望最大化(Expectation Maximization,EM)算法嵌入方式,推导了联合UT-AMP和EM的信道估计算法; Sec. ondly,the orthogonal frequency division multiplexing( OFDM) system is factorized and modeled by using Bayesian theorem, the summarization of the embedding of expectation maximization(EM) into message oassing framework is studied,and then the channel estimation algorithm of joint UT-AMP and EM is de. rived.
14639 最后,建立仿真环境对所提算法进行复杂度分析和数值仿真。 Finally,a simulation environment is built for complexity analysis and numerical simulation.
14640 仿真结果表明,所提算法能够以同阶复杂度实现信道估计性能和频带利用率的提升,具有很高的应用和推广价值。 Simula. tion results show that,the proposed algorithm can improve the performance of channel estimation and spec. trum efficiency with the same order complexity,which is of high application value.
14641 针对传统V2X定位方法定位成功率及定位精度较低的问题,提出了一种联合V2X通信和最小跳数距离的车辆定位方法。车辆利用最小跳数距离估算自身与通信范围外辅助节点间的相对距离,并利用路径相似度因子最高的辅助节点对该误差进行补偿,从而改善定位性能受通信距离约束的局限性。 For the problem of low positioning success rate and low positioning accuracy of traditional V2X positioning method, a vehicle positioning method combining V2X communication and minimum hop dis- tance is proposed.The vehicle uses the minimum hop distance to estimate the relative distance between it- self and auxiliary nodes outside the communication range,and uses the auxiliary node with the highest path similarity factor to compensate for the error, thereby improving the limitation of positioning performance constrained by the communication distance.
14642 同时,综合考虑距离、辅助节点类型对定位性能的影响,利用加权最小二乘法对车辆位置坐标进行解算,提升定位的精度。 At the same time,comprehensively considering the influence of distance and auxiliary node types on positioning performance,the weighted least square method is used to solve the vehicle position coordinates to improve the positioning accuracy.
14643 仿真结果表明,所提定位方法与V2X定位方法相比,在定位成功率及定位精度方面分别提升38.6%和12.5%,具有一定的应用价值。 Simulation results show that com- pared with the V2X positioning method, the proposed positioning method improves the positioning success rate and positioning accuracy by 38.6% and 12.5% repectively,and has certain application value.
14644 介绍了一种Ka频段瓦式T组件的设计方法和关键技术。采用多层印制电路板(Printed Cir-cuit Board,PCB)技术,实现了无源网络和馈电网络集成在同一块多层电路板上,滤波功能层和天线一体化集成,利用毛纽扣实现了组件的三维垂直互联。 The novel design method and key technologies of a tile-type T module in Ka-band is intro- duced.With the multi-layer printed circuit board( PCB) technology,the passive network and the port feed network are integrated on the same layer. The filter and antenna are integrated in one PCB,and the 3D ver- tical interconnection of components is realized by using the fuzz buttons.