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 Platform: |
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Description: 于毕业设计与论文以及做课题用-MSK Simulink simulation program for the design and graduation thesis topic, and making use -Design and graduation thesis, as well as issues to do with-MSK Simulink simulation program for the design and graduation thesis topic, and making use Platform: |
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Author:q |
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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. Platform: |
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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 Platform: |
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Author:王云峰 |
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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) Platform: |
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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) Platform: |
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Author: jonathan Peng |
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Description: Abstract—In this paper we present an initial performance
evaluation of the 3GPP UTRA Long Term Evolution (UTRA
LTE) uplink with baseline settings. The performance results
are obtained from a detailed UTRA LTE uplink link level
simulator supporting OFDMA and SC-FDMA schemes. The basic
transmission scheme for uplink direction is based on singlecarrier
transmission in the form of DFT Spread OFDM with
an MMSE receiver. Two antenna configurations, SISO and 1x2
SIMO are considered in the analysis of spectral efficiency in
addition to Adaptive Modulation and Coding (AMC) and L1-
HARQ. For assessment purposes, the performance results of
SC-FDMA are compared with OFDMA. It is shown that 1x2
SIMO greatly increases the spectral efficiency of SC-FDMA
making it comparable to OFDMA, especially for high coding
rate. Furthermore, SC-FDMA has a flexibility to increase BLER
performance by exploiting frequency diversity. Platform: |
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Author:ashokec |
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Description: 摘要本文首先分析了自适应调制的原理, 它以频谱效率最高为准则, 在恒定功率约束条件下对接收信噪
比优化来选择不同调制阶数。然后引入时变多径信道模型, 通过仿真给出了自适应在此信道条件下的性能, 并分析
了信道估计误差对其性能的影响。
关键词自适应调制, 调制, 时变信道-Abstract This paper first analyzes the principle of adaptive modulation, spectral efficiency it up to standards, in the constant power constraint condition to receive a letter under the noise
Optimization to select different modulation than the order of. Then the introduction of time-varying multi-path channel model is given by simulation of adaptive channel conditions in this performance, and analyze the
The channel estimation error on their performance.
Key words adaptive modulation, modulation, time-varying channel Platform: |
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Author:yanyan |
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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. Platform: |
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Author:朱敏 |
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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.[ Platform: |
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Author:co |
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Description: 在不同的信道条件下计算第一类优先级数据平均频谱效率的MATLAB函数-In different channel conditions, the first class priority data calculated the average spectral efficiency of the MATLAB function Platform: |
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Author:高建丰 |
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Description: or future wireless communications systems, parameters like high transmission data rate, spectral efficiency, and reliability are extremely necessary. In a multipath wireless channel, deploying multiple antennas at both the transmitter and receiver help us achieve higher data rate without increasing the total transmission power or bandwidth. When perfect knowledge of the wireless channel conditions is available at the receiver, the capacity has been shown to grow linearly with the number of antennas. Platform: |
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Author:yasora |
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Description: 】UWB 以其高速率、高频谱利用率、低成本、低功耗和应用范围广等一系列优点受到业界前所未有的关注。正是
由于其高性能、低成本的无线数据通信能力，成为实现无限个人局域网的富有竞争力的技术之一。在介绍超宽带技术(UWB)基
本特点和原理的基础上，重点讨论了该技术在家庭网络中应用的优势和实现，并介绍了超宽带技术在其他方面的最新应用。-】 UWB with its high-speed, high spectral efficiency, low cost, low power and wide application and a series of advantages unprecedented attention by the industry. It is precisely because of its high-performance, low-cost wireless data communication capabilities, unlimited personal LAN to achieving competitive technologies. Introducing the ultra-wideband technology (UWB) basic characteristics and principles, based on a focus on the application of technology in the home network and realize the advantages, and describes other aspects of UWB technology in the latest application. Platform: |
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Author:王敏杰 |
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Description: This paper analyzed the spectral efficiency (total channel capacity per subband) of randomly-spread synchronous multicarrier code-division multiple-access (MCCDMA) channel subject to frequency-selective fading in the asymptotic regime of number of users and bandwidth going to infinity with a constant ratio for uplink and downlink. The following receivers are analyzed in this paper: a) jointly optimum receiver, b) linear MMSE receiver, c) decorrelator, and d) single-user matched filter. Platform: |
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Author:sh3e |
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Description: IN THIS NOVEL AN ALGORITHEM IS DESCRIBED TO INCREASE THE SPECTRAL EFFICIENCY OF OCDMA SYSTEMS Platform: |
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Author:anaman joseph |
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Description: 数字调制QPSK和MSK的性能对比，通过计算和比较频谱利用率、功率谱的滚降、误码性能等-QPSK and MSK digital modulation performance comparison, by calculating and comparing spectral efficiency, power spectrum roll-off, error performance, etc. Platform: |
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Author:王双双 |
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Description: Spectral Efficiency Analysis in OFDM and
OFDM/OQAM based Cognitive Radio Networks
The future wireless communication is expected to
be able to improve the efficiency of spectrum usage. To solve the challenge of spectrum shortage, an innovative opportunistic spectrum access strategy, called Cognitive Radio (CR) has been proposed. Platform: |
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Author:Honaleum |
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Search - spectral efficiency