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fwdmalawmc
Abstract—In this paper, we study the joint estimation of inphase
and quadrature-phase (I/Q) imbalance, carrier frequency
offset (CFO), and channel response for multiple-input multipleoutput
(MIMO) orthogonal frequency division multiplexing
(OFDM) systems using training sequences. A new concept called
channel residual energy (CRE) is introduced. We show that by
minimizing the CRE, we can jointly estimate the I/Q imbalance
and CFO without knowing the channel response. The proposed
method needs only one OFDM block for training and the training
symbols can be arbitrary. Moreover when the training block
consists of two repeated sequences, a low complexity two-step
approach is proposed to solve the joint estimation problem.
Simulation results show that the mean-squared error (MSE) of
the proposed method is close to the Cramer-Rao bound (CRB).
Index Terms—MIMO OFDM, CFO, I/Q imbalance, channel
estimation.
- 2012-03-29 16:33:58下载
- 积分：1
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DSPII_USTC_01
传统的宽带信号中抑制正弦干扰的方法是采用陷波器(notch filter),为此需要精确知道干扰正弦的频率.然而当干扰正弦频率是缓慢变化时,且选频率特性要求十分尖锐时,则最好采用自适应噪声抵消的方法.下图是用一个二阶FIR的LMS自适应滤波器消除正弦干扰的一个方案。该代码实现了以下功能：
1) 借助MATLAB画出了滤波器的误差性能曲面和误差性能曲面的等值曲线；
2） 给出了最陡下降法以及LMS算法的计算公式；
3） 用MATLAB产生了方差为0.05, 均值为0白噪音S(n)，并画出某次采样得到的波形；
4） 根据 2）中的公式，并利用 3）中产生的S(n)，在 1）中的误差性能曲面的等值曲线上叠加画出了采用最陡下降法以及LMS法时H(n)的在叠代过程中的轨迹曲线；
5）用MATLAB计算并画出了LMS法时误差随时间n的变化曲线（对应S(n)的某一次的一次实现）和e(n)波形；
6）在 1）中的误差性能曲面的等值曲线上，叠加画出采用LMS法得到的100次实验中的H(n)的平均值的轨迹曲线；
7）最终对结果进行了分析，具体见压缩包的word文档。
(Wideband signal in the conventional sinusoidal interference suppression method is the use notch filter (notch filter), this requires precise knowledge of the frequency of a sinusoidal interference . However, when the interference frequency sinusoidal changes slowly , and the selected frequency characteristic requirements are very sharp , then best use of adaptive noise cancellation method . following figure is a second-order FIR LMS adaptive filter to eliminate a program sinusoidal interference . The code implements the following functions:
A ) draw with MATLAB error performance of the filter surface and the surface contour error performance curve
2 ) gives the steepest descent method and the LMS algorithm formula
3 ) generated using MATLAB variance of 0.05 with a mean of 0 white noise S (n), and draw a particular sampling waveform
4 ) based on 2 ) of the formula , and use 3 ) generated in S (n), in a ) the error performance curves superimposed on the surface contour pl)
- 2013-11-06 13:12:36下载
- 积分：1
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粒子群优化代码
利用粒子群优化来写了一个Matlab代码。
- 2022-03-19 01:11:03下载
- 积分：1
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xindao
MATLAB信道编码实现信道的无误码阐述的废墟过程(MATLAB channel coding the channel without error process set out in the ruins)
- 2007-07-04 20:01:43下载
- 积分：1
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ConventionalAM
Simulation of Conventional AM modulation (including Envelope detector)
- 2010-11-07 20:45:35下载
- 积分：1
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zernike
zernike矩的源代码，非常不错，用matlab编的，值得下载(zernike moments of the source code, very good, with matlab code, it is worth downloading)
- 2014-09-20 14:28:11下载
- 积分：1
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power_1phPWM
DC/DC and DC/AC PWM Converters
This demonstration illustrates use of the Universal Bridge and Discrete PWM Pulse Generator blocks. It also demonstrates harmonic analysis of PWM waveforms using the Powergui/FFT tool.
- 2014-10-25 23:24:25下载
- 积分：1
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suanshubianma
说明： 利用算数编码基本原理及其实现步骤，通过MATLAB实现算数编码。(Using the basic principle of arithmetic coding and its implementation steps, arithmetic coding is realized by MATLAB.)
- 2019-01-02 16:52:22下载
- 积分：1
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WSN的各种算法
说明： 基于MATLAB的与wsn无线传感器网络有关的仿真程序，有几种路由协议，以及协议之间的比较，例如leach协议中的leach算法，deec协议(There are several routing protocols and the comparison between them, such as LEACH algorithm in LEACH protocol, DEEC protocol)
- 2020-06-01 01:16:57下载
- 积分：1
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c
说明： 精通matlab c语言编程，对于学习matlab的学习和c语言的学习都很有好处。可以帮助初学者掌握较好的编程技能(Proficient in matlab c language programming, learning for learning matlab and c language learning is very good. Can help beginners grasp the good programming skills)
- 2013-09-02 12:34:33下载
- 积分：1
