Modulation,PSAM)信道估计方法,其所用的数学模型合理,理论成熟,算法 复杂度较低,估计性能优良。在正交频分复用系统中,一般情况下都采用此 类信道估计算法。 3.2信道估计的目的 信道估计是进行同步检波与均衡的基础。通过信道估计算法,可以得到 发送端与接收端无线信道的冲激响应,使信道误差最小化,最大程度保证原 ...
modulation and demodulation of sub carrier waves under algorithms in ML and compare the performance with carrying on QPSK modulation directly Keywords OFDM Systematic modeling System synchronization The estimation of frequency offset The compensation of frequency offset The modulation of sub carrier waves ...
(ofdm_modulation)); for i=2:length(ofdm_modulation) copy1(i)=ofdm_modulation(i-1); end Rx_Data = Tx_data + noise; % 根据符号长度和符号数将串行的符号转换为并行的 % - 每一列是符号周期 Rx_Data_matrix=reshape(Rx_Data,IDFT_bin_length, symbols_per_carrier + 1); %对每一列信号做 ...
重庆大学硕士学位论文中文摘要I摘要正交频分复用(OFDM)是一种新型的高效的多载波调制技术,它是由多载波调制MCM(Multi-CarrierModulation)发展来的,能够有效地对抗多径传播,使受到干扰的信号能够可靠地接收。OFDM各个子信道的正交调制和解调可以通过采用快速傅立叶反变换(IFFT)和快速傅立叶变换(FFT)来实现,而随着大规模...
【Key words 】: OFDM; Modulation technique; Communication system 0 引言 随着通信系统中信息传输速率的不断提高,传输带宽也越来越宽,如何充分高效地利用有限的频带成为移动通信技术发展中亟需解决的问题。正交频分复用(Orthogonal Frequency Division Multi-plexing,OFDM)技术作为 4G 移动通信系统的核心技术在近几年...
This design example shows OFDM (or orthogonal frequency division multiplexing) modulation and demodulation. Learn more about implementing OFDM modulation and demodulation.
Apply OFDM modulation to the data and pilot signals. modData = ofdmMod(dataIn,pilotIn); Use the OFDM modulator object to create the corresponding OFDM demodulator. ofdmDemod = comm.OFDMDemodulator(ofdmMod); Demodulate the OFDM signal and output the data and pilot signals. ...
导频辅助信道估计( pilot symbol assisted modulation, PSAM)信道估计。以下将会详细介绍此类。 盲/半盲信道估计。 六、 PSAM 信道估计主要包括三方面的内容 (一) 导频图案的选择 PSAM 信道估计主要依靠插入在数据流当中的导频信号来完成对信道响应的估计,所以导频信号设置方式的选择对于信道估计( 甚至整个系统)的性...
Simulations of the three receivers under different modulation index and modulation order show that the arctangent receiver can be applied in most situations but must have a complicated unwrapping algorithm, and two improved receivers have better performance under small modulation indexes but have the ...
The present invention generally relates to an orthogonal frequency-division multiplexing (OFDM) dual carrier modulation (DCM), and particularly, to a demodulation method for an OFDM DCM. 2. Description of Related Art OFDM technologies become popular in recent years. For example, in the short distan...