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3下载：
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-a
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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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正交频分复用(Orthogonal Frequency Division Multiplexing，OFDM)技术以其频谱利用率高和抗频率选择性衰落强等优点，成为下一代移动通信中最具竞争力的关键技术之一-OFDM (Orthogonal Frequency Division Multiplexing, OFDM) technology for its high spectrum efficiency and strong anti-frequency selective fading, etc.
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Cognitive Radios (CRs), which sense the spectrum and
implement opportunistic sharing when no licensed user is
found to use it, are able to improve the efficiency of
spectrum. Spectrum sensing must be firstly solved in CRs.
Cooperative sen
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基于AF协作分集与M-QAM自适应调制技术的系统频谱效率分析的matlab仿真程序-AF-based cooperative diversity with M-QAM adaptive modulation system spectrum efficiency analysis matlab simulation program
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一种关于GMSK调制技术研究，为了进一步提高频谱的利用效率，设计了一种改进的GMSK-A kind of GMSK modulation technique, in order to further improve the spectrum efficiency, design an improved GMSK
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二相相移键控（BPSK）调制解调过程的MATLAB仿真实现。ASK、FSK、PSK这三种数字调制方式在抗干扰噪声能力和信号频谱利用率等方面，以相干PSK的性能最好，目前已在中、高速传输数据时得到广泛应用。-Binary phase shift keying (BPSK) modulation and demodulation process, MATLAB Simulation. ASK, FSK, PSK modulation in the three digital noise interf
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对带有随机相位和随机噪声的线谱信号，实现周期图谱估计、多重信号分类（MUSIC）两种方法对频谱的估计。代码效率高，可扩展性好。-Of random noise with random phase and the line spectrum signal, spectrum estimation period, multiple signal classification (MUSIC) two methods of spectrum estimation. Code efficiency, go
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协作频谱感知虽然可提高系统的感知性能， 但随着感知节点数目的增加， 系统资源的占用越来越多，
系统传输效率下降． 分析了协作频谱感知方法的感知性能， 得到协作频谱感知的感知性能与感知节点数目和接
收信噪比之间的关系， 提出了一种新的次级用户节点的选择方法， 该方法有效保证了所选择节点的感知性能，
仿真验证了该算法的有效性和可靠性．-Although the cooperative spectrum sensing can improve the perceived performan
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为了提高MIMO-OFDM系统的数据传输率和频谱利用率,提出一种新的自适应算法。该算法在保证信道质量所需误码率和总发射功率的前提下,按照各个子载波衰落程度动态地分配比特和功率,使系统的总数据传输速率最大。理论分析得出,该算法降低了系统运算复杂度,能很大地改善系统的整体性能。-In order to improve data transmission rates and spectrum efficiency of MIMO-OFDM systems,this paper proposes a n
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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.
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正交频分复用(OFDM)是第四代移动通信的核心技术,它是实现宽带无线通信和多媒 体业务发展的基础。对OFDM 技术的基本原理，关键技术以及实现进行了研究，并且通过 matlab 中的通信仿真系统simulink 对OFDM 系统进行了模拟和分析，直观和形象地得到了 OFDM 系统在时域和频域的传输性能，得出的结果表明OFDM 系统可以明显地表现出抗多 径效应引起的频率选择性衰落和提高了频谱利用率，这一特性使得它能够在高数据传输速率 的无线信道中发挥优势。-Orthogonal Frequency
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MIMO．OFDM系统的子载波、功率和比特分配
MIMO技术能不增加系统带宽却提高系统容量和频谱利用率-The MIMO.OFDM system subcarrier, bit and power allocation
MIMO technology can not increase the bandwidth of the system can improve the system capacity and spectrum efficiency
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基于mmse的多用户mimo系统检测算法，空分复用多用户多输入多输出(MIMO)系统具有很高的频谱利用率，由于其系统结构和所处的信道环境的复杂-The spatial division multiplexing multi-user multiple-input multiple-output(MIMO)system has very
high spectrum efficiency．However，its system structure and complexity of the cha
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认知无线电 提高频谱利用率 OR融合准则-OR fusion rule of cognitive radio spectrum efficiency
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多输入多输出（MIMO）系统是在无线通信智能天线技术的基础上发展起来的，其主要特点就是在通信系统的收发两端采用多天线配置，以解决未来移动通信系统大容量、高速率传输和日益紧张的频谱资源间的矛盾。-Multiple-input-multiple-output (MIMO) is a communication technology that multiple antennas are set at transmitters and/or receivers. The system capacity
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Wireless Ad Hoc Networks comprise a fast developing research area with a vast spectrum of
applications. Wireless sensor network systems enable the reliable monitoring of a variety of environments
for both civil and military applications. The Ener
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OFDM 技术具有频谱利用率高、成本低等特点，随着人们对通信数据化、宽带化、个人化和移动化的需求，OFDM 技术在固定无线接入领域和移动接入领域将越来越得到广泛的应用-OFDM technology has high spectrum efficiency, low cost, and communication data, broadband, personal and moving the OFDM technology will increasingly be in the field o
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OFDM为正交频分复用，频谱利用率高，抗干扰性强，应用前景广泛，为4G发展的核心技术，本文用matlan对其进行仿真-OFDM orthogonal frequency division multiplexing, high spectrum efficiency, interference is strong, broad application prospects, 4G development of the core technology, matlan its simulation
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Matlab source code to simulate the spectrum and energy efficiency of LTE network
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