Description: 文章介绍了平坦衰落下的频偏和同步联合恢复技术，能够有效应对时变的信道，并且不需要训练序列，给出了详细的仿真和分析，供大家学习-Two open-loop algorithms are developed for esti-
mating jointly frequency offset and symbol timing of a linearly
modulated waveform transmitted through a frequency-fl at fading
channel. The methods exploit the received signal’s second-order
cyclostationarity and, with respect to existing solutions: 1) they
take into account the presence of time-selective fading effects 2)
they do not need training data 3) they do not rely on the Gaussian
assumption of the complex equivalent low-pass channel process
and 4) they are tolerant to additive stationary noise of any color
or distribution. Platform: |
Size: 535552 |
Author:caiyh |
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Description: plotting Consecutive OFDM Subcarriers in Time domain..This program plots sensitivity of OFDM subcarriers with Carrier frequency offset(CFO)-plotting Consecutive OFDM Subcarriers in Time domain..This program plots sensitivity of OFDM subcarriers with Carrier frequency offset(CFO).. Platform: |
Size: 1024 |
Author:murugan |
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Description: 实现主动频率偏移法的孤岛检测，利用matlab中的S-FUN编写-Frequency offset for active islanding detection method, using matlab written in S-FUN Platform: |
Size: 1024 |
Author:yuejianfang |
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Description: 实现主动频率偏移法的孤岛检测，利用matlab中的S-FUN编写-Frequency offset for active islanding detection method, using matlab written in S-FUN Platform: |
Size: 1024 |
Author:yuejianfang |
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Description: 从多普勒载波频偏对CDMA接收
信号的影响入手，提出了分段匹配滤波器和循环累加码捕获环路相结合的方法进
行扩频码的捕获，并对该方法的性能进行了分析和仿真。
-Doppler frequency offset from the carrier signal on the CDMA receiver to start the impact of proposed sub-cycle accumulation matched filter code acquisition loop and a combination of methods of spreading codes to capture, and the method of performance analysis and simulation. Platform: |
Size: 1025024 |
Author:赵亮 |
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Description: 空时编解码程序，包括频偏信道模型（瑞利信道模型可选）-Space-time encoding and decoding procedures, including frequency offset channel model (Rayleigh channel models are available) Platform: |
Size: 2048 |
Author:田莉 |
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Description: Script for computing the frequency offset from an OFDM short preamble constructed per symbol IEEE 802.11A specifications. -Script for computing the frequency offset from an OFDM short preamble constructed per symbol IEEE 802.11A specifications. Platform: |
Size: 1024 |
Author:abdelsalam |
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Description: This paper considers frequency-domain receiver
design for OQPSK signals (Offset Quaternary Phase
Shift Keying). It is shown that conventional QPSK receivers
are not suitable to OQPSK schemes since they
lead to significant interference between in-phase (I) and
quadrature (Q) components. To overcome this problem
we propose several linear receivers where there is no
I-Q interference. Our receivers are suitable to OQPSK
schemes, significantly outperforming frequency-domain receivers
designed for QPSK modulations. Platform: |
Size: 113664 |
Author:吕立圣 |
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Description: 在蜂窝系统中，移动站台必须能够进行初始同步和搜索基站来开始下行接入。这个过程被称为初始小区搜索。在这篇文章中，同步和小区搜索被具体化。一个新颖的主同步信号的算法，包括理论分析和推导展现出来。-In cellular communication systems the mobile station (MS) must be able to perform initial synchronization and search for a base station to set up
the downlink access. This process is called the initial cell search.In this paper all the procedures of synchronization and initial cell search are specified. An innovative
processing algorithm for PSS, including the theoretical
analysis and deduction, is provided. Most important of all, the proposed scheme is able to evaluate the integer
carrier frequency offset (ICFO) more accurately and improve the detection error rate effectively. Platform: |
Size: 1120256 |
Author:陈伟 |
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Description: 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. Platform: |
Size: 408576 |
Author:蜡笔 |
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Description: A fully digital feedforward MSK demodulator with joint frequency offset and symbol timing estimation for burst mode mobile radio Platform: |
Size: 771072 |
Author:邓杰 |
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Description: 单相逆变器并网控制和有源频率偏移孤岛检测-Single-phase inverter and network control and active islanding detection of frequency offset Platform: |
Size: 84992 |
Author:陈一帆 |
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Description: Altem公司quartus
II 8．1开发环境下，完成了中频全数字解调器的FPGA实现，并对数
字下变频、载波同步、位同步等解调器的核心模块设计进行了详细的分析和说明，给出
了实现框图和仿真波形。同时在本设计中应用了Altera公司的NiosII软核处理器技术，
用于载波的大频偏校正和解调器各个部分的监测和控制。最后给出了QPSK中频全数字
解调器关键性能指标的测试方法和测试结果，测试结果表明本设计达到了预期的性能指
标要求。-The Algorithm is converted to HDL description for FPGA realization．The designs of the core Modules of demodulator, including digital down-conversion，carrier ring，bit synchronization loop design, are described in detail．And a block diagram and simulated waveforms are provide in the latter part．Also the soft-core processor technology of Altera’s NiosII is applied in the design for carrier frequency offset correction and the monitoring and control of the separate parts of demodulator．Finally, the test methods and results of key performance indicators of the IF Demodulator QPSK are given to show that the design given in this paper can reach the performance requirements expected. Platform: |
Size: 4328448 |
Author:zhuimeng |
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Description: 自己编写的ofdm系统中MInn算法，可以实现精确的符号定时同步-I have written SCH algorithm in OFDM systems, to achieve timing synchronization and frequency offset estimation Platform: |
Size: 8192 |
Author:maomao |
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Description: 自己编写的OFDM系统中SCH算法，实现定时同步与频偏估计-I have written SCH algorithm in OFDM systems, to achieve timing synchronization and frequency offset estimation Platform: |
Size: 5120 |
Author:maomao |
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Search - frequency offset