Description: This project aim was to build wireless software modem for data communication
between two computers using an acoustic interface in the voice frequency range (20Hz–
20,000Hz). The transmitting antenna is a speaker (frequency response of: 90Hz –
20,000Hz) and the receiving antenna is a microphone (frequency response of: 100Hz –
16,000Hz). The test files used as information files were text files.
This goal was attained both in an incoherent scheme and in a coherent scheme.
Build under Matlab code, our modem uses OFDM (orthogonal frequency division
multiplexing) modulation, synchronization by LMS sequence, channel estimation (no
equalizer) via pilot tones. The symbols are either PSK or ASK for a constellation size of
2 or 4. To optimize the probability of error, these symbols were mapped using Gray
mapping.
Report Platform: |
Size: 559541 |
Author:buyop |
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Description: 11.txt为产生信道冲激响应的源码，
22.txt为各种OFDM信道估计算法的源码-11.txt for producing channel impulse response of the source, 22.txt for a variety of OFDM channel estimation algorithm for the source Platform: |
Size: 2048 |
Author: |
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Description: This project aim was to build wireless software modem for data communication
between two computers using an acoustic interface in the voice frequency range (20Hz–
20,000Hz). The transmitting antenna is a speaker (frequency response of: 90Hz –
20,000Hz) and the receiving antenna is a microphone (frequency response of: 100Hz –
16,000Hz). The test files used as information files were text files.
This goal was attained both in an incoherent scheme and in a coherent scheme.
Build under Matlab code, our modem uses OFDM (orthogonal frequency division
multiplexing) modulation, synchronization by LMS sequence, channel estimation (no
equalizer) via pilot tones. The symbols are either PSK or ASK for a constellation size of
2 or 4. To optimize the probability of error, these symbols were mapped using Gray
mapping.
Report-This project aim was to build wireless software modem for data communicationbetween two computers using an acoustic interface in the voice frequency range (20Hz-20000Hz). The transmitting antenna is a speaker (frequency response of: 90Hz-20000Hz) and the receiving antenna is a microphone (frequency response of: 100Hz-16000Hz). The test files used as information files were text files.This goal was attained both in an incoherent scheme and in a coherent scheme.Build under Matlab code, our modem uses OFDM ( orthogonal frequency divisionmultiplexing) modulation, synchronization by LMS sequence, channel estimation (noequalizer) via pilot tones. The symbols are either PSK or ASK for a constellation size of2 or 4. To optimize the probability of error, these symbols were mapped using Graymapping.Report Platform: |
Size: 559104 |
Author: |
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Description: OFDM频域算法，根据WLAN前导的长训练符号完成所有对子载波的信道频率响应的简单有效的估算，这两个长训练符号内容是一样的，因此二者的平均可以改进信道估算的质量。-OFDM frequency-domain algorithm, according to leading WLAN long training symbols to complete all the pairs of channel-carrier frequency response of simple and effective estimate, the two long training symbols is the same as the content, so they can improve the average quality of channel estimation. Platform: |
Size: 1024 |
Author:李贞铭 |
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Description: 在基于脉冲的UWB系统中，采用瑞克接收机合并多径信号能量并进行相干检测，信道估计问题即估计多径信号的到达时间和幅度。在基于OFDM的UWB系统中，接收机根据信道频域响应对每个子信道进行频域均衡后进行相干检测，信道估计问题即估计信道频域响应。-Pulse-based UWB systems, rake receivers using the combined multipath signal energy and coherent detection, channel estimation problem that is estimated multipath signal arrival time and amplitude. OFDM-based UWB system, the receiver under the channel frequency response of each subchannel to frequency domain equalization after coherent detection, channel estimation problem that is estimated channel frequency response. Platform: |
Size: 2048 |
Author:王洁 |
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Description: 此程序是关于OFDM（正交频分复用）同步中信道响应的程序-This procedure is on the OFDM (Orthogonal Frequency Division Multiplexing) channel synchronization in response to the procedure Platform: |
Size: 2048 |
Author:郭振红 |
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Description: 信道描述，计算冲激响应函数，为频选衰落信道，用于MIMO或ＭＩＭＯ－ＯＦＤＭ系统-Channel description, calculation of impulse response function, for Frequency-Selective Fading Channels for MIMO or MIMO-OFDM system Platform: |
Size: 1024 |
Author:刘斐 |
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Description: 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. Platform: |
Size: 551936 |
Author:santhu |
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Description: 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. Platform: |
Size: 277504 |
Author:santhu |
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Description: mimo-ofdm 自适应的比特:分配按照信道响应降序排列,子载波间争夺比特和功率步长为2-mimo-ofdm adaptive bit: assigned in descending order according to the channel response, the rivalry between subcarriers bit and power step 2 Platform: |
Size: 1024 |
Author:刘三根 |
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Description: MIMO的信道估计及误差，信道频域响应，两种估计方法，误差-MIMO channel estimation and error, channel frequency response of two estimation methods, the error Platform: |
Size: 2048 |
Author:郑沐 |
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Description: 这是OFDM系统中基于导频的信道估计及其MATLAB仿真，详细描述了OFDM的信道估计和matlab仿真。有益于研究OFDM系统的资料-This is the pilots to estimate the channel response and its MATLAB simulation based on OFDM system, a detailed description of the channel estimation and MATLAB OFDM simulation. Beneficial to the research of OFDM system data Platform: |
Size: 297984 |
Author:黄佳吉 |
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Description: mimo-ofdm系统仿真，输出仿真图，信道脉冲响应实部虚部随信噪比变化时的改变图-mimo-ofdm system simulation, simulation output figure, the channel impulse response changes in real and imaginary parts of the map changes with SNR Platform: |
Size: 1024 |
Author:666 |
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Description: 研究快时变OFDM信道估计的WSSUS模型的时变脉冲响应MATLAB仿真图，也是实现《Wireless Communications OverRapidly Time-Varying Channels (2011)>>中的脉冲响应仿真图源程序-Research of fast time-varying OFDM channel estimation WSSUS model the time-varying impulse response of the MATLAB simulation diagram, and realize the Wireless Communications OverRapidly Time- Varying Channels (2011) > > in the impulse response simulation graph source program Platform: |
Size: 1024 |
Author:周艳 |
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Description: 一种噪声辅助数据分析方法,单径或多径瑞利衰落信道仿真，采用波束成形技术的BER计算，一个很有用的程序，最大似然（ML）准则和最大后验概率（MAP）准则，脉冲响应的相关分析算法并检验，搭建OFDM通信系统的框架，连续相位调制信号(CPM)产生。- A noise auxiliary data analysis method, Single path or multipath Rayleigh fading channel simulation, By applying the beam forming technology of BER A very useful program, Maximum Likelihood (ML) criteria and maximum a posteriori (MAP) criterion, Related impulse response analysis algorithm and inspection, Build a framework OFDM communication system, Continuous phase modulation signal (CPM) to produce. Platform: |
Size: 9216 |
Author:fxyuzvztx |
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Description: OFDM系统通过在时域符号前插入大于信道冲击响应长度的循环前缀（CP）可以避免符号间干扰(ISI)和载波间干扰(ICI)。但是，过长CP会使得数据传输效率降低。可以采用最小均方误差（MMSE）信道缩短均衡技术来压缩信道冲击响应长度。-OFDM systems avoid inter-symbol interference (ISI) and inter-carrier interference (ICI) by inserting a cyclic prefix (CP) larger than the channel impulse response length before the time-domain symbol. However, long CP will reduce the efficiency of data transmission. A minimum mean square error (MMSE) channel shortening equalization technique may be employed to compress the channel impulse response length. Platform: |
Size: 7500800 |
Author:15383463525wyh |
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Description: 文章介绍了自适应均衡技术在MIMO OFDM系统中的应用研究。-In this paper, an adaptive channel
estimation for MIMO OFDM is proposed. A set of pilot
tones first are placed in each OFDM block, then the
channel frequency response of these pilot tones are
adaptively estimated by recursive least squares (RLS)
directly in frequency domain not in time domain. Then Platform: |
Size: 419840 |
Author:王峰 |
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Search - channel response ofdm