循环前缀(Cyclic Prefix):可以在保护间隔中插入CP以减少ICI。将每个OFDM符号之后的采样点复制到OFDM符号的前面。这确保包括在OFDM符号的时延副本中的波形周期的数目是FFT周期中的整数,这保证了子载波的正交性。复制有效载荷的末端并作为循环前缀进行传输,可确保传输信号和信道响应之间存在“循环”卷积。这允许接收器应用...
In normal mode operation following the discovery mode, CNU receives a data packet comprising an OFDM symbol from the CLT. OFDM symbol of the received data packet has a cyclic prefix composed of a first length shorter than the second length....
这个保护地带,单载波SC和正交多载波OFDM下都需要,但是OFDM利用Cyclic Prefix来做保护,更加有好处,比如: 作用1(ISI符号间干扰):GI的保护隔离,时间上;数据从F域变换道T域上,整体加隔离(加什么由作用2来定) 作用2(ICIC子载波干扰):加循环前缀解决的问题:各个子载波的数据接收端的时延不同,如何保证一个周期内,同...
3.8.2 Cyclic Prefix The purpose of the cyclic prefix is to combat ISI and intra-symbol interference. The cyclic prefix is a guard time made up of a replica of the time-domain OFDM waveform. The basic premise is to replicate part of the back of the OFDM signal to the front to create ...
5.1.2.1 Cyclic Prefix OFDM CP-OFDM employs a rectangular pulse shape, i.e., p[n] in (5.7) is given by (5.8)p[n]:={1Nscif0⩽n⩽Nsc−1,0elsewhere, where Nsc is the total number of subcarriers. There is no post filtering operation, i.e., wtx[n]=δ[n] in (5.7). To...
用更加数学的语言,矩阵,来看的话,使用了CP以后信道矩阵变成了一个circulant matrix,这种matrix的特点是可以分解成F*D*F^H,其中F是傅立叶矩阵,D是对角矩阵。正是因为D是对角矩阵,就可以理解成每个subcarrier可以看成一个siso系统,可以使用简单的检测方法。具体分析见OFDM_cyclic prefix tutorial。
Consequently, cyclic prefix (CP) added at the source node should have a much longer length than that of one-hop OFDM transmission to avoid inter-symbol interference. However, the increased CP length leads to the reduced spectrum efficiency of OFDM communications. In this paper, we propose a ...
代能派况设代能派况设对于 Normal cyclic prefix 来说, 一个 DL PRB 的资源在时域上包含 14 个 OFDM 符号, 在频域上包含 12 个子载
百度试题 题目对于Normalcyclicprefix来说,一个DLPRB的资源在时域上包含14个OFDM符号,在频域上包含12个子载波。相关知识点: 试题来源: 解析 FALSE 反馈 收藏
1. Define the parameters of the OFDM system, including the number of subcarriers (N), guard time duration (Tg), symbol duration (Ts), and cyclic prefix length (Tc). 2. Generate the data symbols to be transmitted, represented as a complex-valued vector. ...