Description: OFDM的基本原理和信道均衡以及峰值功率的控制-OFDM and the fundamental principles channel equalization and peak power control Platform: |
Size: 193536 |
Author:Heaton |
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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: Script for computing the BER for BPSK modulation in a
Rayleigh fading channel with 2 Tx, 2Rx MIMO channel
Zero Forcing Equalization with Successive Interference
Cancellation (ZF-SIC)-Script for computing the BER for BPSK modulation in a
Rayleigh fading channel with 2 Tx, 2Rx MIMO channel
Zero Forcing Equalization with Successive Interference
Cancellation (ZF-SIC) Platform: |
Size: 2048 |
Author:mohanad1 |
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Description: OFDM简单链路，包含信道估计和信道均衡，算法包括LS和MMSE-OFDM simple links, including channel estimation and channel equalization, algorithms, including the LS and MMSE Platform: |
Size: 2048 |
Author:赵晴 |
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Description: 信道均衡技术是移动通信中抗衰落的三大技术之一。均衡是用来解决由于信道的非线性和时变性引起的码间干扰的有效技术。如何有效解决码间干扰问题，具有重要的理论意义。 本文在介绍自适应均衡技术的基本原理和均衡研究现状的基础上，阐述了目前几种典型的自适应均衡算法及其它们存在的一些问题。文章在传统自适应算法的基础上，提出了两种改进算法：基于RLS的自适应MIMO-DFE算法和基于分数间隔的改进CMA+SDD算法。计算机仿真结果表明，两种算法的收敛速度快，稳态误差小，均衡效果与传统算法相比都取得了明显提高。-Channel equalization in mobile communications technology is the anti-fading of the three technologies. Balance is used to solve due to channel non-linear and time-varying inter-symbol interference caused by effective techniques. How to effectively solve the inter-symbol interference problem, has important theoretical significance. This paper introduces the basic principle of adaptive equalization and balanced study of the status quo, based on the current set of several typical adaptive equalization algorithm and some of the problems of their existence. Article in the traditional adaptive algorithm based on the proposed two improved algorithms: RLS-based adaptive MIMO-DFE algorithms and interval-based scores improved CMA+ SDD algorithm. Computer simulation results show that the two kinds of convergence of the algorithm fast, steady-state error is small, compared to equilibrium results with the traditional algorithms have achieved significantly improved. Platform: |
Size: 43012096 |
Author:阿郎 |
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Description: 主要是Peter Zillmann, Wolfgang Rave, and Gerhard Fettweis编写的turbo码在ofdm中信道均衡的文章。-Mainly Peter Zillmann, Wolfgang Rave, and Gerhard Fettweis prepared turbo codes for channel equalization in ofdm article. Platform: |
Size: 197632 |
Author:xjn |
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Description: OFDM系统中时域均衡的仿真和结果分析，先对搭建的最基本的OFDM系统性能进行仿真分析，然后对在多径信道下的OFDM系统性能进行仿真分析，最后对MMSE算法进行仿真分析。-OFDM system, time domain equalization and results of the simulation analysis, the first of the basic structures of the simulated OFDM system performance analysis, and multi-path channel in the OFDM system performance under simulated and analyzed, the final simulation of the MMSE algorithm. Platform: |
Size: 180224 |
Author:郑永钊 |
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Description: Alim, O. A., N. Elboghdadly, et al. (2007). Channel estimation and equalization for fixed/mobile OFDM WiMAX system in simulink. Proceedings of the 1st international conference on MOBILe Wireless MiddleWARE, Operating Systems, and Applications. Innsbruck, Austria, ICST (Institute for Computer Sciences, Social-Informatics and Telecommunications Engineering): 1-6. Platform: |
Size: 448512 |
Author:Lakmali |
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Description: Ajey, S., B. Srivalli, et al. (2010). On performance of MIMO-OFDM based LTE systems. Wireless Communication and Sensor Computing, 2010. ICWCSC 2010. International Conference on.
4G wireless systems predominately employ multiple input multiple output (MIMO) with an orthogonal frequency division multiplexing (OFDM) system. Like other 4G systems long term evolution (LTE) also employs MIMO-OFDM physical layer. MIMO helps in increasing the throughput whereas OFDM converts a frequency selective fading channel to multiple flat fading sub-channels facilitating easy equalization. It is proposed that LTE system should mandatorily support 2Ã — 2 MIMO setup. Our paper focuses on the performance of such a LTE system with two transmit antennas and two receive antennas in a frequency selective fading environment. Platform: |
Size: 311296 |
Author:Lakmali |
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Description: 一个包含信道估计和均衡的ofdm系统的matlab程序 实用易懂-Includes a channel estimation and equalization of ofdm matlab program practical and easy to understand system Platform: |
Size: 8192 |
Author:段一 |
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Description: 给出了OFDM在卫星通信中的系统框图并
在Simulink中仿真实现，利用改进的CMA恒模算法进行盲均衡处理，来去除时变卫星信道对信号的影响,基于4阶累积量的方法
将OFDM信号与其他调制类型信号区分开来-OFDM is given in the satellite communication system block diagram and Simulation in Simulink using the modified constant modulus algorithm CMA for blind equalization, to remove the time-varying satellite channel on the signals, based on 4-order cumulant method OFDM signals and other types of signal modulation to distinguish Platform: |
Size: 3167232 |
Author:赵亮 |
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Description: OFDM中的信道均衡技术对于研究如何消除噪声干扰以及去除相位偏移的有着重要的作用-OFDM channel equalization techniques in the study of how to eliminate noise and to remove the phase offset has an important role in Platform: |
Size: 1368064 |
Author:闫城 |
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Description: OFDM(Orthogonal Frequency Division Multiplexing)即正交频分复用技术，实际上OFDM是多载波调制的一种。其主要思想是：将信道分成若干正交子信道，将高速数据信号转换成并行的低速子数据流，调制到在每个子信道上进行传输。正交信号可以通过在接收端采用相关技术来分开，这样可以减少子信道之间的相互干扰 ICI 。每个子信道上的信号带宽小于信道的相关带宽，因此每个子信道上的可以看成平坦性衰落，从而可以消除符号间干扰。而且由于每个子信道的带宽仅仅是原信道带宽的一小部分，信道均衡变得相对容易。-OFDM (Orthogonal Frequency Division Multiplexing) that is orthogonal frequency division multiplexing, in fact, is a multi-carrier OFDM modulation. The main idea is: The channel is divided into a number of orthogonal sub-channel, high-speed data signal into parallel low-speed data streams, modulated to be transmitted on each subchannel. Quadrature signal at the receiving end can be separated using technologies, which can reduce the mutual interference between ICI subchannels. The signal bandwidth of each subchannel is less than the channel coherence bandwidth, and therefore can be regarded as flat fading on each sub-channel, thereby eliminating inter-symbol interference. And because the bandwidth of each subchannel is only a small part of the original channel bandwidth, channel equalization becomes relatively easy. Platform: |
Size: 2048 |
Author:刘金星 |
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Description: 程序详细地介绍了OFDM系统中导频信号信道估计的作用，适用于快衰落信道，能够快速跟踪均衡信道，同时包含一个详细介绍算法（LS MMSE）的算法文档。-Procedures described in detail in the pilot signal OFDM system channel estimation role for fast fading channels, fast track channel equalization, and contains a detailed algorithm (LS MMSE) algorithm documents. Platform: |
Size: 148480 |
Author:东方泓 |
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Description: 在MIMO2*2的无线信道环境下，运用OFDM(Orthogonal Frequency Division Multiplexing)即正交频分复用技术，发送信号，经过奇异值分解预编码，调制，在接收端解调，均衡，最终等到估计信号，并计算了整个系统的误码率；-In the wireless channel environment MIMO2* 2, the use of OFDM (Orthogonal Frequency Division Multiplexing) that is an orthogonal frequency division multiplexing, transmission signal, through a singular value decomposition of the pre-encoding, modulation, demodulation at the receiver, equalization, until the final estimated signal, and calculate the error rate of the whole system Platform: |
Size: 1024 |
Author:liaoxiao |
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Description: WIMAX_WZ_withencoding:信道估计，相位噪声补偿，频偏估计，编解码都有
WIMAX_WZ_withoutencoding：在上面的工程基础上，去掉编解码部分
WIMAX_WZ_withoutprocessing：在上面的工程基础上，再去掉相位噪声补偿，频偏估计
WIMAX_WZ_withoutprocessing2：在上面的工程基础上，改用新的前导和导频联合信道估计方案,参考文档《基于802_16d标准的OFDM信道估计技术的研究与实现.kdh》
因为白噪声信道仿真只能体现QPSK调制和RS-CC编码的性能，需要仿真SNR可控的SUI信道，来估计信道均衡的性能。
在多普勒频偏fd>100Hz时，联合信道估计性能才比前导估计强，否则前导估计性能更优。对于600MHz中心频率，要求收发机相对运动速度大于180km/h，这种情况出现的概率不大-WIMAX_WZ_withencoding: channel estimation, phase noise compensation, frequency estimation, the codec has WIMAX_WZ_withoutencoding: the project on the basis of the above, remove the codec section WIMAX_WZ_withoutprocessing: the project on the basis of the above, then remove the phase noise compensation, offset estimation WIMAX_WZ_withoutprocessing2: In the project on the basis of the above, use the new leader and pilot joint channel estimation scheme, the document " Standards-based 802_16d OFDM channel estimation and implementation of technology .kdh" because white noise channel simulation only reflects the QPSK modulation and RS-CC coding performance requires simulation SNR controllable SUI channel, to estimate the performance of channel equalization. When Doppler shift fd> 100Hz, joint channel estimation performance was stronger than the leading estimate, otherwise better estimation performance leader. For 600MHz center frequency transceiver requirements relative velocity Platform: |
Size: 40960 |
Author:陈茂 |
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Description: frequency division multiplexing (OFDM) is used extensively in broadband wired and wireless communication systems because it is an effective solution to intersymbol interference (ISI) caused by a dispersive channel. This becomes increasingly important as data rates increase to the point where, when conventional serial modulation schemes like quadrature amplitude modulation (QAM) or NRZ are used, the received signal at any time depends on multiple transmitted symbols. In this case the complexity of equalization in serial schemes which use time domain equalization rises rapidly. In contrast, the complexity of OFDM, and of systems using serial modulation and frequency domain equalization, scale well as data rates and dispersion increase. [1]–[3]. A second major advantage of OFDM is that it transfers the complexity of transmitters and receivers the analog to the digital domain-frequency division multiplexing (OFDM) is used extensively in broadband wired and wireless communication systems because it is an effective solution to intersymbol interference (ISI) caused by a dispersive channel. This becomes increasingly important as data rates increase to the point where, when conventional serial modulation schemes like quadrature amplitude modulation (QAM) or NRZ are used, the received signal at any time depends on multiple transmitted symbols. In this case the complexity of equalization in serial schemes which use time domain equalization rises rapidly. In contrast, the complexity of OFDM, and of systems using serial modulation and frequency domain equalization, scale well as data rates and dispersion increase. [1]–[3]. A second major advantage of OFDM is that it transfers the complexity of transmitters and receivers the analog to the digital domain Platform: |
Size: 415744 |
Author:kartick |
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Description: 搭建了一个在有高斯白噪声与瑞利衰落共同存在的信道下的OFDM 发送接受系统，研究了信道均衡技术，与相关的误码率曲线-OFDM has a built in white Gaussian noise and Rayleigh fading channels under the co-existence of the sending and receiving systems, channel equalization technology research, and related BER curves Platform: |
Size: 13312 |
Author:朱先生 |
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Search - channel equalization in ofdm