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针对MIMO-OFDM系统中期望最大化(EM)信道估计算法在高信噪比(SNR)下带来的误差地板(EF)现象,且OFDM符号的数据传输效率随发射天线数的增加而明显降低,提出一种改进的高效EM信道估计算法。该算法首先引入一种准确的等效信号模型并推导出一种修正的EM算法,改善了EM算法在高SNR下的性能 在多个OFDM间利用相位正交导频序列来提高数据传输效率,同时进行联合信道估计以提高估计性能。仿真实验验证了所提算法具有更高的信道估计性能和更高的数据传输效率。(For multiple-input multiple-output with orthogonal frequency division multiplexing(MIMO-OFDM) systems,the error floor(EF) phenomenon at high signal noise rate(SNR) was induced by the expectation maximum(EM) channel estimation algorithm.In addition,the data transmission efficiency was declined obviously with the increasing number of transmit antennas.According to these problems,an improved and efficient EM channel estimation algorithm was pro-posed.Firstly,an accurate and equivalent signal model was introduc...)
- 2011-09-05 15:20:54下载
- 积分：1
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khelil_diss
master thesis for wireless ad hoc network
- 2009-04-21 00:00:33下载
- 积分：1
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WiMAX-LOS-and-NLOS-Technology
WIMAX LOS NLOS TECHNOLOGY WHITEPAPER
- 2009-04-03 07:03:38下载
- 积分：1
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ASK4
ASK系统的设计与仿真，相干解调及误码率的计算(Ask system design and simulation of coherent demodulation and the calculation of the bit error rate in English)
- 2020-12-04 08:49:24下载
- 积分：1
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卫星通信中数字调相信号调制方式识别方法研究
说明： 针对数字卫星常用的 7 种通信信号调制方式(QPSK、8PSK、16QAM、32QAM、64QAM、16APSK、32APSK)，对零中心归一化瞬时幅度谱密度最大值、四次方谱、幅度、高阶累积量四种特征参数进行了分析，提出了一种联合特征参数的信号调制识别方法．(Aiming at seven communication signal modulation modes commonly used in digital satellite (QPSK, 8PSK, 16QAM, 32QAM, 64QAM, 16APSK and 32APSK), four characteristic parameters of zero-center normalized instantaneous amplitude spectral density, quadratic spectrum, amplitude and high-order cumulant are analyzed, and a signal modulation recognition method of joint characteristic parameters is proposed. Method.)
- 2020-06-21 09:20:02下载
- 积分：1
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DCT
本文介绍了基于DCT 的图像压缩编码技术, 并给出了具体的实现方法和步骤, 既保证具有较高的压缩比, 又保证了较好的图像
质量。(This paper introduces the coding of image based on DCT , therefore,shows the details of realization . It provides high compressibility
and high quality.)
- 2009-05-22 01:37:43下载
- 积分：1
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msgrouter
观察者模式实现各模块之间的异步通讯。模拟MFC消息(message router)
- 2013-10-16 14:26:10下载
- 积分：1
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cdlab
this file talk about network
- 2012-10-13 08:30:27下载
- 积分：1
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cdma
说明： cdma系统的仿真程序,包括cdma各个系统的仿真，可扩展(cdma system simulation program, including all cdma system simulation, scalability)
- 2021-04-16 11:58:54下载
- 积分：1
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DSP
说明： matlab仿真凯塞窗的源代码，希望能帮到大家(simulation of Kaiser window,hoping to be helpfull for you)
- 2019-12-30 00:49:01下载
- 积分：1
