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In wireless communications, fading is deviation of the attenuation that a carrier-modulated telecommunication signal experiences over certain propagation media. The fading may vary with time, geographical position and/or radio frequency, and is often
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A signal is transmitted using a carrier frequency of 900 MHz. It is
transmitted through a multipath channel which can be modelled as Rayleigh
fading. Assumingthe Dopper spread as 10Hz and the number of multipaths as
10, generate the Rayleigh
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单载波系统在高斯白噪声和多径信道条件下的仿真——加入独立字导频且采用最小二乘信道估计-Single carrier system in gaussian white noise and multipath channel under the condition of the simulation to join the independent word frequency and the least square estimation channel
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多载波系统在高斯白噪声和多径信道下的仿真——加入导频，采用时域均衡-Many carrier system in gaussian white noise and multipath channel simulation-to join the frequency, the time equilibrium
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单载波频域均衡系统matlab仿真程序。信道使用的是多径瑞利衰落信道。-The single-carrier frequency domain equalization system Matlab simulation program. Channel using multipath Rayleigh fading channels.
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ml时频同步算法，基于OFDM系统的。子载波数 128
位数/ 符号 2
符号数/ 载波 100
训练符号数 0
循环前缀长度 8 (1/16)*T
调制方式 4-QAM
多径信道数 3
IFFT Size 128
信道最大时延 2-ml frequency synchronization algorithm, based on the OFDM system. Digit of the number of subcarriers 128 /2
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Abstract-The mobile radio channel can be simulated as a
complex-valued random process with a time-varying variance.
This paper describes an implementation of that process using
a real-time Digital Signal Processing (DSP) technique. The simulato
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在低压电力线载波通信中的多径信道仿真，仿真了6径信道，绘制了时域和频域图-In the low-voltage power line carrier communication multipath channel simulation, simulation of six-path channel, draw time-domain and frequency domain
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OFDM is a multi-carrier transmission technique. It converts the frequency selective fading channel into a collection of parallel flat fading sub-channels which simplifies the structure of a receiver. OFDM has been widely used in communication system
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水声通信面临的最困难的问题是多途干扰,其中自多途引起接收信号的幅度衰落,互多途引起接收信号的码间干扰,再加上海洋环境的高噪声背景、低的载波频率、极为有限的带宽以及传输条件的时间—空间—频率变化特性,使得通信过程十分困难。此外，水声通信试验的成本高，难度大，也为水声通信研究带来挑战。
本软件对水声信道的仿真研究很有帮助，可以产生声线图，冲激响应，声速图等仿真文件，结合Matlab画图工具绘制图像，对水声信道的模拟仿真很有帮助。-The most difficult problem fac
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Many papers have extended STBC design to frequency-selective
channels. In [6], STBC has been proposed for single-carrier transmission, which can achieve maximum space-delay diversity in rich
scattering channels. The transmission formats proposed
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正交频分复用(OFDM)技术是一种可以有效对抗符号间干扰(ISI)的高速数据传输技术。OFDM是一种特殊的多载波调制方式，它的基本思想是将高速传输的数据流通过串/并转换，变成在若干个正交的窄带子信道上并行传输的低速数据流。OFDM接收机有三个关键技术：信道估计技术，降低峰均比(PAPR)技术和同步技术。OFDM技术能有效的对抗多径衰落等，有着诸多的优点，但是OFDM有一个发展瓶颈，即OFDM信号的峰均功率比很大，很容易导致OFDM信号的交调失真和系统性能的下降。因而如何降低OFDM信号的峰均功率
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shows the free-space path loss at the carrier frequency of fc = 1.5 GHz for
different antenna gains as the distance varies
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