四、PAPR减小技术——以DFT-s-OFDM为例 在《MIMO-OFDM无线通信技术及MATLAB实现》第7章PAPR减小技术,介绍了以下几种:限幅技术、编码技术、加扰技术、自适应预失真技术和DFT扩频技术。 本文将集中在DFT扩频技术上,这是为什么呢?这里结合5G NR协议来说。 以下内容来自王映民、孙韶辉的《5G移动通信系统设计与标准详解》...
这两台仪器虽然说一个是量测时域一个是量测频域,但新型态的频谱分析仪或叫做讯号分析仪(Signal Analyzer)骨子里都是量测时域(Time Domain),其实现实的讯号都是所谓的时域讯号,只是高频讯号很难直接量测,所以才会用接收机先降频后在处理,但现在高阶的示波器(Oscilloscope)的取样率(Sampling Rate)与频宽都相当高,已...
2.nr(new radio)系统为由第三代合作伙伴计划(3rd generation partnership project,3gpp)主导的第五代移动通信系统(5g),其中涉及离散傅里叶变换扩频的正交频分复用多址接入(dft-s-ofdm)的调制技术,这需要采用多个点数的、非2指数次幂的傅里叶变换处理器。3.但是,在满足5g的超低时延特性以及资源消耗尽可能少等...
The terminal is adapted for transmitting reference signaling having a comb structure for transmission based on either the first FDMA technology or the second FDMA technology. The disclosure also pertains to related devices and methods.ROBERT BALDEMAIRERIK DAHLMANLARS LINDBOMSTEFAN PARKVALL...
概述根据正交频分复用(OrthogonalFrequencyDivisionMulti-plexing,OFDM)的基本构成,可以在时域和频域内进行导频插入。导频插入的形式有很多种,其中,最典型的导频插入方式是块状导频和梳妆导频。作为2种插入方式的应用推广,正交频分多址接入(OrthogonalFrequencyDivisionMultipleAccess,OFDMA)系统的导频插入方式是上述2种...
text>In this paper, we successfully transmit 8 x 520 Gb/s pre-equalized DFT-spread PDM-16QAM orthogonal frequency-division multiplexing (OFDM) signal over 840 km SMF with BER under 2.4 x 10(-2). We discuss how to obtain accurate tranceivers' response during pre-equalization for DFT-spread...
The received signal will be the convolution of the channel and the transmitted signal. Assuming that the channel is static during an OFDM block, at the receiver side after removing the CP, the FFT output as the demodulated received signal can be expressed as B1 B2 ...
At the receiver, with the th OFDM symbol, the th subcarrier of the received signal is denoted as (1) where are the pilot subcarriers, for simplicity, it is assumed that , represents the channel frequency response on the th subcarrier. is the AWGN with zero mean and variance of . ...
we describe a utility of channel estimation technology for OFDM systems using discriminant analysis. Usually, significant channel taps are detected on the basis of a predetermined threshold, so the optimal threshold value becomes a crucial factor. But it is difficult to decide channel taps that are...
In some implementations, an interleaved demodulation reference signal (DMRS) structure is adopted for π/2-BPSK DFT-spread OFDM based data shared channels, which may be referred to as Type 1. Data shared channels may include a downlink shared channel (DL-SCH) and an uplink shared channel (UL...