网络释义 1. 正交分频多工调变 4.7正交分频多工调变(OFDM Modulation) 54 第五章 接收端系统架构设计 55ofdm program :资料名称 发个matlab关于ofdm …www.showxiu.com|基于9个网页 例句 释义: 全部,正交分频多工调变 更多例句筛选 1. Orthogonal frequency division multiplexing (OFDM) modulation is an ...
Orthogonal Frequency Division Multiplexing (OFDM) is a digital multi-carrier modulation scheme that extends the concept of single subcarrier modulation by using multiple subcarriers within the same single channel. Rather than transmit a high-rate stream of data with a single subcarrier, OFDM makes ...
OFDM —— OFDM(Orthogonal Frequency Division Multiplexing)即正交频分复用技术,实际上OFDM是MCM Multi-CarrierModulation,多载波调制的一种。其主要思想是:将信道分成若干正交子信道,将高速数据信号转换成并行的低速子数据流,调制到在每个子信道上进行传输。正交信号可以通过在接收端采用相关技术来分开,这样可以减少子信...
Therefore, in every control module of OFDM modulation and demodulation, some logic is dedicated to signal alignment.因此,在OFDM调制解调中的每个控制模块中都有一些逻辑信号专用于信号对齐。 该实例中也通过Avalon Stream信号sink_ready(输入准备好信号)和source_ready(输出准备好信号)来支持背压。循环前缀插入...
进入openair1\PHY\MODULATION\ofdm_mod.c,找到OFDM调制代码,OFDM输入信号在经过信道编码,交织,调制后成为比特流,通过IFFT及那个频域输入映射到时域后根据情况加上循环前缀(后缀,补零或者无)。 首先是函数do_OFDM_mod 根据帧来判定是MBSFN调制还是PDCCH调制,同时判定为常规CP还是扩展CP,实现一是IFFT,二是添加循环CP。
多载波调制技术(Multicarrier Modulation)采用了多个载波信号。它把数据流分解为若干个子数据流,从而使子数据流具有低得多的传输比特速率,利用这些数据分别去调制若干个载波。所以,在多载波调制信道中,数据传输速率相对较低,码元周期加长,只要时延扩展与码元周期相比小于一定的比值,就不会造成码间干扰。因而多载波调制对于...
正交频分多址(Orthogonal frequency-division multiplexing,OFDM)有时又称为分离复频变调技术(discrete multitone modulation,DMT)正交频分多址技术可以视为多载波传输的一个特例,具备高速率资料传输的能力,加上能有效对抗频率选择性衰减通道,而逐 渐获得重视与采用。
OFDM modulation and demodulation are typically (as of 2001) implemented using数字滤波器banks generally using the快速弗利叶变换(FFT). Although highly complex, COFDM has high performance under even very challenging channel conditions. By combining the OFDM technique with error-correcting codes, adaptive ...
Y= ofdmmod(X,nfft,cplen,nullidx,pilotidx,pilots)inserts null and pilot subcarriers into the frequency domain input data symbols prior to performing OFDM modulation. The null subcarriers are inserted at the index locations specified bynullidx. The pilot subcarriers,pilots, are inserted at the ...