Description: 估算带宽，先是计算输入信号单边带功率谱密度，然后估算出信号所占的带宽-Bandwidth estimation, first calculating the input signal is single sideband power spectral density, and then estimate the proportion of signal bandwidth Platform: |
Size: 1024 |
Author:罗燕群 |
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Description: SPEECH ENHANCEMENT BASED ON WAVELET DENOISING
Abstract: - Noise is an unwanted and inevitable interference in any form of communication. It is
non-informative and plays the role of sucking the intelligence of the original signal. Any kind of
processing of the signal contributes to the noise addition. A signal traveling through the channel
also gathers lots of noise. It degrades the quality of the information signal. The effect of noise
could be reduced only at the cost of the bandwidth of the channel which is again undesired as
bandwidth is a precious resource. Hence to regenerate original signal, it is tried to reduce the
power of the noise signal or in the other way, raise the power level of the informative signal, at
the receiver end this leads to improvement in the signal to noise ratio (SNR). There are several
ways in doing it and here the focus is on adaptive Signal processing new technique (Grazing
Estimation method) to improving the signal to noise ratio.-SPEECH ENHANCEMENT BASED ON WAVELET DENOISING
Abstract:- Noise is an unwanted and inevitable interference in any form of communication. It is
non-informative and plays the role of sucking the intelligence of the original signal. Any kind of
processing of the signal contributes to the noise addition. A signal traveling through the channel
also gathers lots of noise. It degrades the quality of the information signal. The effect of noise
could be reduced only at the cost of the bandwidth of the channel which is again undesired as
bandwidth is a precious resource. Hence to regenerate original signal, it is tried to reduce the
power of the noise signal or in the other way, raise the power level of the informative signal, at
the receiver end this leads to improvement in the signal to noise ratio (SNR). There are several
ways in doing it and here the focus is on adaptive Signal processing new technique (Grazing
Estimation method) to improving the signal to noise ratio. Platform: |
Size: 192512 |
Author:majid |
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Description: 设计一完整的移动通信系统物理层传输方案
(WiMAX场景)：
试设计一完整的移动通信系统物理层传输方案并用MATLAB程序实现，要求满足以下指标：
1. 数据速率：5km/hr的移动速度下可实现60Mbps，同时在120km/hr的移动速度下可实现10Mbps，且Eb/No小于20dB时可实现误比特率Pe <= 10-4
2. 信号带宽为20MHz，工作在2GHz频带
3. 信道模型: COST207模型的6径瑞利信道(可参考程序 multipath_code.zip)
请给出以下结果：
A．收发机结构框图，主要参数设定；
B．
误比特率仿真曲线。(考虑非理想同步和信道估计)；-Design a complete system for mobile communications physical layer transmission scheme (WiMAX scene): try to design a complete system for mobile communications and physical layer transmission scheme to achieve with the MATLAB program, requires the following indicators: 1. Data rate: 5km/hr mobile speed can achieve 60Mbps, while the movement in the 120km/hr speed can achieve 10Mbps, and Eb/No less than 20dB can be achieved when the bit error rate Pe < = 10-4 2. signal bandwidth of 20MHz, the work in the 2GHz band 3. channel Model: COST207 model 6 path Rayleigh channel (refer to program multipath_code.zip) Please give the following results: A. Transceiver block diagram, the main parameter settings B. BER simulation curves. (Taking into account non-ideal synchronization and channel estimation) Platform: |
Size: 5120 |
Author:wangjiayin |
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Description: OFDM（正交频分复用）系统以其抗多径衰落和较高的频带利用率，得到了众多领域的广泛应用。本文就OFDM系统中关键技术之一的信道估计技术进行了介绍。并分别叙述了OFDM系统和信道估计的意义，归纳了信道估计的分类，最后介绍了MMSE、LS及其改进信道估计算法并仿真出结果。-OFDM（orthogonal frequency division multiplexing) has been widely used in many areas for its good resistance to multipath fading and high bandwidth efficiency.In this paper,channel estimation,which is one of the key technologies in OFDM systems,were introduced.
Then we discuss the significance of the channel estimation and the classification of channel estimation.Finally,we study the algorithms of channel estimation such as MMSE,LS and LMMSE,and further get the simulation results.
Platform: |
Size: 7168 |
Author: |
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Description: OFDM(正交频率调制)实现多载波调制基本思想是将带宽信道分解成许多并行的窄子信道，是每个子信道的想干带宽，从而实现平稳衰落。搭建了完整的OFDM信道链路系统，运用三种不同的信道估计方法(LS信道估计、DFT信道估计、Improved-DFT信道估计)，并对AWGN理想信道和衰落信道误码情况进行了仿真和比较。-OFDM (Orthogonal Frequency Modulation) multicarrier modulation basic idea bandwidth channel is decomposed into a number of parallel narrow subchannels, each subchannel wanted bandwidth, in order to achieve a smooth fading. Build a complete OFDM channel link system, the use of three kinds of different channel estimated method (LS channel estimated, to the DFT letter Tao estimates, Improved-the DFT letter Road estimated), and AWGN ideal letter Road and fading channel bit error situation conducted a simulation and comparison . Platform: |
Size: 11264 |
Author:高学才 |
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Search - bandwidth estimation of channel