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 u...
It’s important to have a fundamental understanding of Orthogonal Frequency Division Multiplexing (OFDM) because this technology is a basic building block for many of the current modulation schemes including; 802.11WLAN, 802.16 WiMAX, and 3GPP LTE. This topic discusses the basic concepts of OFDM and...
Tab.1 Mapping table of modulation bk)ck 3.2 ROM控制器设计 在ROM控制器中,根据ROM中映射表的安排,第七位地址线为0时对应于64QAM调制,地址线的前六位对应于输入数据;第七位地址线为1时对应于16QAM调制,地址线的前四位对应于输入数据。这样,根 据前级输出中输入的调制方式和输入的数据,模块控制器就能产生一...
andthenexplainthebasictheoryofOFDMresearch.IncludingoftheblockdiagramofOFDMsystem;theOFDMmodulationanddemodulationsystem;cyclicprefix;theguardinterval;oversamplingandOFDMsystemsadvantagesanddisadvantages.Finally,contrastingandanalyzingtoexplaintheimportaneeoftheOFDMsystemchannelestimation.Keywords:OFDMsystem,channelestimation,...
This design example shows OFDM (or orthogonal frequency division multiplexing) modulation and demodulation. Learn more about implementing OFDM modulation and demodulation.
2.Signal 域帧结构 在前导码之后是signal域,signal域主要包含Rate和Length两个字段,Rate用于传输有关...
Orthogonal Frequency Division Multiplexing 正交频分复用 frequency 传统多载波 frequency OFDM frequency OFDM基本原理——OFDM发射机 OFDM基本原理——OFDMA收发系统 趋于完善的、多用户的基本的OFDMA收发信通信原理框图如下所示: Three key points to be noted (mark as RED) Initial block diagram of an OFDM transc...
(a) BPSK modulation (b) QPSK modulation 0 2 4 6 8 10 12 10 -3 10 -2 10 -1 10 0 10 1 10 2 Peak/Average(dB) 1 - C D F ( % ) OFDM signal Single-carrier baseband signal DFA-OFDM signal(i=0,j=0) DFA-OFDM signal(i=26,j=0) DFA-OFDM signal(i=26,j=60) 23 ...
Including of the block diagram of OFDM system; the OFDM modulation and demodulation system;cyclic prefix;the guard interval; oversampling and OFDM systems advantages and disadvantages. Finally,contrasting and analyzing to explain the importance of the OFDM system channel estimation. Keywords:OFDM system...
Summary This chapter presents the typical implementation of an OFDM equipment used in a WiMAX network. The transmit side block diagram is divided into four blocks: bit processing, symbol processing, digital IF processing and carrier modulation. Bit processing is divided into three stages: ...