Description: 这是一个仿真移动通信信道幅频响应的matlab仿真程序。-This is a simulation of mobile communications channel amplitude frequency response of Matlab simulation program. Platform: |
Size: 2323 |
Author:zm |
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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 Platform: |
Size: 559541 |
Author:buyop |
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Description: 这是一个仿真移动通信信道幅频响应的matlab仿真程序。-This is a simulation of mobile communications channel amplitude frequency response of Matlab simulation program. Platform: |
Size: 2048 |
Author:zm |
Hits:
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: 数据辅助的载波相位跟踪，在第n个接收符号的DFT之后，导引子载波等于信道频率响应和已知符号的乘积根据余下的频率误差旋转以后的结果。-Data-aided carrier phase tracking in the first n months after receiving DFT symbols, guided subcarriers equivalent channel frequency response and known symbol of the product in accordance with rotation frequency error remaining after the results. 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: In this paper, a novel demodulation structure in
high-frequency (HF) channel is introduced and studied.Frequency-offset estimation, ractionally spaced adaptive equalization and carrier recovery techniques are involved.Frequency-offset correction is carried out based on channel impulse response estimation. ractionally spaced adaptive equalization and carrier recovery are combined with nonlinear decision feedback loop structure and the initial value
of tap coefficients of equalization are obtained from the previous channel estimation. Simulation is conducted under channel parameters with respect to MIL-STD-188-110B using a Monte Carlo technique. The results show this novel demodulation structure is feasible and efficient in HF channel, the symbol error ratio can reach to 10− 3 in 12dB SNR.-In this paper, a novel demodulation structure in
high-frequency (HF) channel is introduced and studied.Frequency-offset estimation, ractionally spaced adaptive equalization and carrier recovery techniques are involved.Frequency-offset correction is carried out based on channel impulse response estimation. ractionally spaced adaptive equalization and carrier recovery are combined with nonlinear decision feedback loop structure and the initial value
of tap coefficients of equalization are obtained from the previous channel estimation. Simulation is conducted under channel parameters with respect to MIL-STD-188-110B using a Monte Carlo technique. The results show this novel demodulation structure is feasible and efficient in HF channel, the symbol error ratio can reach to 10− 3 in 12dB SNR. Platform: |
Size: 186368 |
Author:Lin |
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Description: Designs a frequency-domain and time-domain FIR equalizer for
a single-input single-output (SISO) channel.
Frequency-domain equalization uses a Chebychev criteria and
is specified in terms of frequency response functions.
It is a convex problem (which can be formulated as an SOCP):
-
where H is the frequency response function and our variable
is the filter impulse response h. Function G is the unequalized
frequency response and G_des is the desired freq response.
Time-domain equalization immediately designs the impulse
response function by specifying the problem in time (it s an LP):
minimize max_{t neq D} |g_tilde(t)|
s.t. g_tilde(D) = 1
Platform: |
Size: 1024 |
Author:wwcj |
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Description: 信道的频率响应是时变的，设计最佳的固定的解调滤波是不可能的，因此，需要一种能补偿或减少接收信号中ISI的方法，这种ISI补偿方法称为均衡方法。
自适应均衡技术能够用来抵消由于信道带限或时间色散所导致的码间干扰，可以使通信系统更有效地利用信道带宽。
-Channel frequency response is time-varying, the best fixed design demodulation filter is impossible, therefore, need to be able to receive compensation or reduce the signal in the ISI method, the ISI compensation is called a balanced approach. Adaptive equalization techniques can be used to offset the channel band-limited or time dispersion caused by the inter-symbol interference can make communication systems more efficient use of channel bandwidth. Platform: |
Size: 4096 |
Author:高露洁 |
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Description: This report discusses the analys of Channel gain matrix to extract all channel informations like frequency reponse, impulse response, power delay profile, correlation bandwidth ets along with the matlab code Platform: |
Size: 2852864 |
Author:mirza |
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Description: 在3GPP系统中，初始小区搜索包含两步，这两步要用到主同步信号和辅同步信号。这篇文章介绍了一种辅同步信号检测的方法。-In 3GPP Long Term Evolution (LTE) system,initial cell search procedure comprises two steps using primary
synchronization signal (PSS) and secondary synchronization
signal (SSS). This paper presents SSS detection method for
second step of initial cell search. In general, coherent detection
using estimated channel frequency response (CFR) at PSS is
used for SSS detection, but performance degradation is occurred
by difference of channel between PSS and SSS in time division
duplex (TDD) mode. Thus we propose non-coherent detection
using partial correlation and differential correlation. Moreover,
we consider cyclic-prefix (CP) detection algorithm that uses CP
and its repetition part of data symbol, and we investigate
influence of CP detection in SSS detection process. Platform: |
Size: 367616 |
Author:陈伟 |
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Description: 双通示波器频谱测量的滤波器设计
经过待通过滤波器处理后的频率响应，以及滤波前后的信号的双通道谱测量的结果进行分析，检查滤波器后的信号是否满足用户的频率范围要求-Design of Filter for Spectrum Measurement of Dual Oscilloscope
After the filter to be processed by the frequency response, and the signal before and after filtering the results of dual-channel spectrum measurement to check the signal after the filter to meet the user s frequency range requirements Platform: |
Size: 176128 |
Author:jesse |
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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 - frequency response channel