Search - snr ofdm

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[Communication-Mobile] ofdm_system DL : 0: 结合OFDM的典型调制解调系统，输出误码率与信噪比仿真图，及误码率与信噪比理论图 ofdm.m为主运行文件-A typical combination of OFDM modem system, the output bit error rate and SNR simulation diagram, and bit error rate and SNR ofdm.m-based theory of graph paper to run
Date : 2025-12-31 Size : 21kb User : 陈俊鑫
[Communication-Mobile] cdf_vs_snr DL : 0: 改程序实现了mimo无线通信的容量的CDF、PDF等分布曲线-Procedures to achieve the capacity of mimo wireless communication of the CDF, PDF and other distribution curve
Date : 2025-12-31 Size : 1kb User : 月竹
[Communication-Mobile] MIMO DL : 1: 有关MIMO的各种程序,比如编码,信道仿真,信道估计,信噪比计算等,各子程序能够独立运行-MIMO-related procedures, such as coding, channel simulation, channel estimation, SNR calculation, the subroutine can be run independently
Date : 2025-12-31 Size : 33kb User : lizhigang
[Communication-Mobile] 1 DL : 0: OFDM中不同信噪比对误码率性能的影响的matlab仿真的实验代码-Different OFDM bit error rate performance of SNR on the impact of the experiment code on matlab simulation
Date : 2025-12-31 Size : 2kb User : 王伟
[Communication-Mobile] TeddyPurnamirzaMED2005TTT DL : 0: OFDM Project (BER to SNR)
Date : 2025-12-31 Size : 315kb User : ofer
[Communication-Mobile] MIMO_OFDM DL : 0: 基于期望最大化(EM)的最大后验信道估计算法(MAP)在高信噪比(SNR)下将很难获得较低的估计误差,并且,对于导频辅助的MIMO-OFDM系统,OFDM符号的数据传输效率随着发送天线的增加而明显下降.为改善这两种缺陷,引入一种等效的信号模型来改善高SNR下的估计性能在相邻多个OFDM符号内使用相移正交导频序列和联合估计来提高系统的数据传输效率和估计性能根据角域内信道间的独立性来减小噪声对估计的影响.通过仿真实验可知,所提算法具有更小的估计误差和更高的数据传输效率.-Maximum a posteriori(MAP) channel estimation algorithm usually uses expectation maximum(EM) algorithm to decrease the high computation.However,this kind of operation has a difficulty in obtaining ideal estimation performance at high signal to noise ratio(SNR) because of the convergent feature of EM algorithm.In addition,for pilot-based multiple-input multiple-output with orthogonal frequency division multiplexing(MIMO-OFDM) systems,data transmission efficiency of OFDM symbol will be reduced with the increas...
Date : 2025-12-31 Size : 131kb User : 王睿
[Communication-Mobile] 123 DL : 0: 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...
Date : 2025-12-31 Size : 770kb User : 王睿
[Communication-Mobile] MIMO-OFDM-Systems-Based-on-Preamble- DL : 0: MIMO􀀁 OFDM 技术将成为第4 代移动通信系统的关键技术, 因MIMO􀀁 OFDM 对时间和频率偏移非常敏感, 因此MIMO􀀁 OFDM 同步显得尤为重要。提出了一种新的MIMO􀀁 OFDM 定时同步和频偏同步技术。以GCL 序列为基础设计了一个新的符合MIMO􀀁 OFDM 同步技术的导频序列, 通过对该导频序列进行2 次相关得到频率估计, 并将所得频率运用到定时同步中, 得到更为准确的时间估计。仿真结果表明, 在相同的信噪比情况下, 该方法可以使得系统的误码率和帧传送误码率相对传统方法得到进一步减小。-MIMO􀀁 OFDM will become a key technology of the fourth generation mobile communications system. However, MIMO􀀁 OFDM is sensitive to the CFO and timing synchronization, so the MIMO􀀁 OFDM synchronization technology is very important. This paper proposes an accurate technique for timing and frequency synchronization of multiple􀀁 input multiple􀀁 output ( MIMO ) orthogonal frequency division multiplexing ( OFDM) systems. The technique derives a new preamble signal based on GCL sequences, according with the MIMJO􀀁 OFDM synchronization. The carrier frequency offset ( CFO) estimation is obtained through taking double correlation operations on the preamble signal, and used in the timing synchronization to gain accurate time estimation. The simulation results show that at the same SNR, the proposed method can reduce the BER and the frame transmission BER of the system compared to the conventional method.
Date : 2025-12-31 Size : 399kb User : 蜡笔
[Communication-Mobile] OFDM DL : 1: 一个OFDM在加性高斯白噪声信道(AWGN)和多径瑞利衰落信道(MuhipathReyleighFading)下的调制解调模型，simulink建模，仿真信噪比、频谱图、星座图。-A OFDM in additive white gaussian noise (AWGN) channel and multipath Rayleigh fading channel (MuhipathReyleighFading) of demodulation model, simulink modeling, simulation SNR, spectrum diagram, constellation chart.
Date : 2025-12-31 Size : 16kb User : 茵茵
[Communication-Mobile] matlab DL : 1: 基于ofdm的信道系统源代码，包括调制、解调等。函数功能：实现数据的QPSK调制—PLC信道传输—BPSK解调—得到误码率- is_noise 是否添加噪声：0 否，1 是 is_convenc 是否进行卷积编码： 0 否 , 1 是；——信道编码 interout 交织输出 interin 交织输入 chan_type PLC信道类型：0 无多径，1 四径模型，2 11径模型，3 AR模型，4 FIR模型； snr 信噪比
Date : 2025-12-31 Size : 28kb User : tan
[Communication-Mobile] OFDM-DVB-T-DTMB DL : 1: DVB-T，DTMB简化的信道仿真程序。设置了三种保护间隔：循环前缀、零添加、伪随机添加。用于研究不同保护间隔下的SNR特性，附带一个不同保护间隔下的频谱显示，可看出三种保护间隔对OFDM频谱陡峭程度的影响。-DVB-T，DTMB channel simulation and spectrum display.
Date : 2025-12-31 Size : 12kb User : foxlili
[Communication-Mobile] Home Work (23) DL : 0: SNR vs. BER Plot Spread Spectrum Modulation, BPSK Signal through AWGN Channel
Date : 2025-12-31 Size : 47kb User : Calaquei
[Communication-Mobile] BER_vs_SNR_OFDM_with_BPSK DL : 0: OFDM系统计算BER和 SNR，较为准确(compute BER and SNR,ofdm sym can make a real SNR and BER.)
Date : 2025-12-31 Size : 1kb User : dasdsaf
[Communication-Mobile] MIMO1 DL : 0: 实现基于STBC的MIMO_OFDM通信系统在不同信噪比情况下接收端的误比特率的仿真。发射端包括基于基带调制、空时编码、导频插入、IFFT、串并合并以及添加循环前缀；接收端包括去除循环前缀、取出导频估计信道、FFT运算以及并串合并，空时解码等。仿真中采用QPSK、空时编码采用4*3的复正交空时编码矩阵。OFDM子载波数为100，每个子载波传输66个符号，每个符号2比特。IFFT长度为512个符号。发射天线为3个接收天线为2个。(The BER simulation of MIMO_OFDM communication system based on STBC under different SNR is realized. The transmitter includes baseband modulation, space-time coding, pilot insertion, IFFT, serial-parallel combination and adding cyclic prefix; the receiver includes removing cyclic prefix, extracting pilot estimation channel, FFT operation, parallel-serial combination, space-time decoding, etc. The complex orthogonal space-time coding matrix is used in QPSK and space time coding in 4*3. The number of OFDM subcarriers is 100, and each subcarrier transfers 66 symbols with 2 bits per symbol. IFFT is 512 symbols in length. The transmitting antenna is 3 receiving antennas, 2.)
Date : 2025-12-31 Size : 3kb User : guokeDz
[Communication-Mobile] 6 DL : 3: 6. 在三条径的瑞利信道中，对于OFDM： (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。画出比特信噪比与信道估计均方误差的关系曲线和比特信噪比与误码率的关系曲线。 (2) 设频率已同步，请设计OFDM一种具体的采用循环前缀进行时间同步方法，用Simulink进行仿真，画出比特信噪比与捕获概率的关系曲线。 (3) 设时间已同步，请设计OFDM一种具体的采用循环前缀进行频率同步方法，用Simulink进行仿真，画出比特信噪比与频率同步误差的关系曲线。(6. In the three-path Rayleigh channel, for OFDM: (1) please design a specific navigation-assisted channel estimation method and use Simulink for simulation.The relation curves of bit signal-noise ratio and channel estimation mean square error and the relation curves of bit signal-noise ratio and bit error rate are drawn. (2) if the frequency has been synchronized, please design a specific method of time synchronization using cyclic prefix in OFDM. Simulink is used for simulation to draw the relationship curve between bit-snr and acquisition probability. (3) if time has been synchronized, please design a specific method of frequency synchronization using cyclic prefix in OFDM. Simulink is used for simulation to draw the relationship curve between bit signal-to-noise ratio and frequency synchronization error.)
Date : 2019-01-15 Size : 311kb User : kmdcdy