raised cosine meaning in English
升余弦
Examples
- High performance raise cosine filter design
高性能升余弦滤波器设计 - According to the nyquist first criterion , the usual way is to use raising cosine shaping filter in real communication system . by choosing appropriate rolling off factor and determining the distribution of its characteristics between the transmitter and the receiver , the shaping , filter will minimize the nonlinear distortion , of channel
根据奈奎斯特第一准则，在实际的通信系统中，通常的途径是采用升余弦滚降成形滤波器，选择适当的滚降系数，并确定其特性在收、发两端的分配问题，以便将信道非线性的影响最小化。 - On the base of above it , this paper discuss the synthesis of optimum distributed arrays by nonuniform spacing in the sense of dolph - chebyshev . having derived the equations of optimum element distribution , we analyze the exponentially spaced array , which are optimum when the elements are isotropic and equally weighted , and the array by general raised cosine function . the formulate for estimating the sidelobe envelope , beamwidth of the array pattern and clean region width are obtained
推导了最佳阵元分布方程,分别对阵元无方向性和等加权时的最佳分布式阵列? ?指数间隔阵列和采用广义升余弦加权的最佳分布式阵列进行了分析,推导了天线方向图旁瓣包络、波束宽度,干净扫描区宽度的估计公式,给出了近轴旁瓣电平与阵列参数的关系。 - Fpga and dvb standard are introduced firstly , dvb - c standard and composition of its system are analyzed completely , development of modulator structure and dvb - c digital modulator composition are presented , more over , analysis of respective modular are given . then , principle of dvb - c digital modulator system are presented , they are error control technique 、 mqam 、 nyquist rule and root raised cosine filter 、 window design method for fir filter 、 multi - rate signal processing ( integer interpolating , conversion of fractional sampling , equal conversion of net structure , polyphase structure for filter , poly - phase structure for interpolator , multi - stage implementation of samplying conversion ) 、 distrubited algorithm 、 cic filter 、 dds 、 cordic algorithm
接着,专门利用一个章节阐述了dvb - c前端调制系统原理,他们了差错控制技术、多进制调制( mqam ) 、 nyquist准则与平方根升余弦滤波器、有限冲击响应滤波器的窗函数设计法、多抽样率信号处理包括(整数倍内插原理、分数倍抽样率转换、网络结构的等效结构、滤波器的多相表示、内插器的多相表示、抽样率转换的多级实现) 、分布式算法、 cic滤波器、直接数字频率合成( dds ) 、 cordic算法。 - The emphasis of the thesis is base - band signal shaping and programmable interpolation algorithm . we introduce the basic theory of base - band signal shaping , and the effect of the digitizing of the ideal raised cosine rollof signal g ( t ) is attentioned . the shaping filter parameters are determined based on the system specifications , and the simulation results are given
首先从降低邻近码间干扰原则出发,讨论了基带成形的基本原理与升余弦滚降滤波器的时频特性,重点分析将理想的滚降波形g ( t )数字化后对频谱的影响,并且根据系统指标,确定了各项参数,给出了具体的设计举例和仿真结果。