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Description: 功率谱估计的应用范围很广，在各学科和应用领域中受到了极大的重视。在《现代信号处理》课程中讲述了经典谱估计和现代谱估计这两大类谱估计方法；经典谱估计是基于傅立叶变换的，虽然具有运算效率高的优点，但是频谱分辨率低同时旁瓣泄漏严重，对长序列有着良好的估计。为了克服经典谱估计的缺点，人们开展了对现代谱估计方法的研究。现代谱估计是以随机过程的参数模型为基础的，有最大似然估计法、最大熵法、AR模型法、预测滤波器法。现代谱估计对短序列的估计精度高，同经典谱估计互为补充。在认真学习了现 代谱估计方法后，我选择了现代谱估计中的AR模型法的仿真作为题目。下面给出AR模型的相关理论和仿真实现。-Power Spectral Estimation of very extensive, in all disciplines and fields of application of a great deal of attention. The "modern signal processing" on the curriculum of classical and modern spectral estimation spectrum is estimated that the two types of spectrum estimation method; Classical spectrum estimation is based on Fourier transform, although high computing efficiency advantages, but also low-resolution spectrum Sidelobe serious leakage of long sequences have good estimates. In order to overcome the classic shortcomings of the spectrum estimation, there have been a pair of modern spectral estimation methods. Modern spectral estimation is the random process model parameters based on the maximum likelihood estimation, maximum entropy method, AR model, forecast filter. Spe
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Description: 以半连续隐含马尔可夫模型HMM 为例,分析了影响Viterbi算法效率的主要原因,讨论了提高该算法效率的3种实用策略,即码本剪枝、Beam剪枝及降低精度,在保证一定识别率的前提下,使得搜索处理更加有效,提高了搜索的速度-to semi-continuous HMM HMM example, Analysis of the impact on the efficiency of the Viterbi Algorithm main discussed increasing the efficiency of the algorithm for three kinds of practical strategy, code pruning, beam pruning and reducing precision, In recognition rate guarantee, under the premise of making the process of searching more efficient and improve the search speed
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Author: xiaobai |
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Description: QPSK技术具有抗干扰性能强、误码性能好、频谱利用率高等优点,目前广泛应用于数字通信、数字视频广播、数字卫星广播等领域 详细介绍了QPSK技术的工作原理、性能以及使用调相法和相位选择法产生QPSK信号的电路方框图及特点。-QPSK technology has strong anti-interference performance, BER performance and spectral efficiency advantages, at present widely used in digital communications, digital video broadcasting, digital satellite broadcasting and other areas described in detail QPSK technology works, performance and the use of phase modulation method and phase selection have a QPSK signal and characteristics of the circuit block diagram.
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Author: feixiang |
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Description: 文章中分析了OFDM系统的频谱利用率，研究了OFDM系统中的信道判决反馈均衡问题-Article analyzes the spectral efficiency of OFDM systems to study the OFDM system channel decision feedback equalizer problem
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Author: 王云峰 |
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Description: 8单径瑞利信道中的四发四收V-BLAST：
(1) 请设计一种具体的导引辅助的信道估计方法，用Simulink进行仿真，测量16QPSK调制时的误码率性能。画出比特信噪比与信道估计均方误差的关系曲线，画出比特信噪比与误码率的关系曲线。
(2) 计算所设计方案的频谱效率是多少，单位为bit/Hz/s。-8 Single-Path Rayleigh Channel Four received four V-BLAST: (1) Please design a specific guide-assisted channel estimation method, using Simulink simulation, measurement 16QPSK modulation BER performance. Draw-bit signal to noise ratio and channel estimation mean square error curve, draw-bit signal to noise ratio and bit error rate curve. (2) calculate the design of spectrum efficiency is the number of units of bit/Hz/s.
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Author: haohao |
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Description: 认知无线电是一种通过与其运行环境交互而改变其发射参数提高频谱利用率的新的智能技术。-Cognitive radio is viewed as a novel approach that can change its transmitter parameters based
on interaction with the environment where it operates and can alSO improve its spectrum access and efficiency．
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Author: deng |
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Description: MIMO 系统仿真，对时变信道的自适应调制-erq.m : function for ERQ algorithm in MIMO systems
space_wf.m : function for spatial domain power waterfilling
st_wf.m : function for spatial and temporal domain waterfilling
MIMO_rate.m : Plot spectral efficiency vs SNR for various cases
MIMO_ber.m : Plot BER vs SNR for ERQ algorithm
Report_figN.m : Plot figure N in final report (N=1,2,...,8)
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Author: jonathan Peng |
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Description: VBLAST系统仿真，针对时变信道的自适应调制算法-erq.m : function for simulating ERQ algorithm with Gap parameter
sqpc_g.m : function for simulating SQPC algorithm with Gap parameter
sr_g.m : function for simulating SR algorithm with Gap parameter
vblast_rate.m : function for calculating the data rate in V-BLAST
sim_erq.m : Plot spectral efficiency and power usage ratio vs SNR for TSQPC and ERQ algorithm.(Fig. 9, 10, 11 and 12)
sim_region.m : Plot spectral efficiency with vs SNR for different number of regions.(Fig. 13 and 14 in final report)
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Author: jonathan Peng |
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Description: In this thesis we have concentrated on energy consumption issue and aim to develop an energy efficient data aggregation protocol. To provide energy efficiency we have considered a cluster-based wireless sensor network.
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Author: sireine |
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Description: 在已知信源统计规律的情况下，快速实现对信源的霍夫曼编码，编码效率达到97 以上-Statistical law known source case, rapid implementation of the source of the Huffman coding, coding efficiency up to 97 or more
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Size: 3072 |
Author: richardzeng |
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Description: 用MATLAB实现算术编码，并计算其平均码长，熵和编码效率-Achieved using MATLAB arithmetic coding, and calculates the average code length, entropy and coding efficiency
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Author: 先知 |
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Description: 正交频分复用的研究，可以有效提高上行链路的频谱利用率。-Orthogonal frequency division multiplexing studies can effectively improve the uplink spectral efficiency.
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Author: lidajun |
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Description: Calculation of diffraction efficiency of rectangular phase grating (scalar theory)
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Author: tom |
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Description: Calculation of diffraction efficiency of rectangular phase grating (comparison scalar theory and scalar theory with shadow effect)
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Author: tom |
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Description: The transmission range that achieves the
most economical use of energy in wireless ad hoc networks
is studied under homogeneous node distribution. By assuming
the knowledge of node location, we first proposed
a transmission strategy to ensure the progress of data
packets toward their final destinations. Then the average
packet progress for a transmission range universal for all
nodes is derived, which is accordingly used to determine
the optimal transmission range that gives the maximum
efficiency of energy consumption. Different from some
previous work, our analysis does not make the assumption
of large nodal density in the wireless ad hoc networks
studied. Numerical and simulation results are presented
to examine our analysis for wireless ad hoc networks.
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Author: Krishna |
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Description: 16QAM因其高频谱利用率而被第三代移动通信增强型技术HSDPA采用。由于Turbo译码需要软信息输入，因此，解调输出需要计算比特软信息（LLR）。本文分析了LLR理论算法并在此基础上导出了简化算法。-16QAM its high spectral efficiency have been enhanced third-generation mobile communication technology HSDPA use. Turbo decoding requires soft information as input, therefore, need to compute soft output demodulation information (LLR). This paper analyzes the LLR theory based on the algorithm derived in this simplified algorithm.
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Author: 朱敏 |
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Description: AF协作分集信道与M-QAM自适应调制技术的系统频谱效率分析-AF cooperative diversity channels with M-QAM adaptive modulation spectral efficiency of the system
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Author: 刘少智 |
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Description: 正交频分复用（OFDM）是一种特殊的多载波传输技术。它可以有效地对抗多径衰落，能够以很高的频谱利用率来实现高速数据传输。分析介绍了OFDM系统的基本原理及系统性能，以Matlab为开发平台，仿真了OFDM系统的误码率，仿真结果表明OFDM系统在较低信噪比下也具有较好的性能-Orthogonal Frequency-division Multiplexing（OFDM） is a special kind of multi-cartier transmission technology. It can effectively overcome multi-path fading and increase the spectral usage efficiency to implement high-speed data transmission. This paper analyzes the basic principle of OFDM system and system performance, and simulates the Bit Error Rate （BER） of OFDM system on the platform of Matlab. The simulation results show that the OFDM has a good performance.[
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Author: co |
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Description: HIGH EFFICIENCY SINGLE INDUCTOR BUCK-BOOST CONVERTER WITH 1-A SWITCHES
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Author: maya |
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Description: Spectral Efficiency of CDMA Cellular Networks
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Author: muhammad |
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