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Description: 《MIMO-OFDM关键技术的研究和完整仿真平台的建立》，建立了一个完整的MIMO-OFDM的仿真平台，为实际的硬件平台提供解决方案，给出性能评估。为建立这个完整的仿真平台，本文从MIMO-OFDM信号模型，提出系统实现的各个关键技术:帧同步和载波频偏估计、信道估计、采样同步和载波跟踪、空时/频编解码。- MIMO-OFDM key technology research and the establishment of a complete simulation platform , the establishment of a complete MIMO-OFDM simulation platform, for the actual hardware platform to provide solutions, given performance evaluation. For the establishment of the integrity of the simulation platform, this article from the MIMO-OFDM signal model, the system in all key technologies: frame synchronization and carrier frequency offset estimation, channel estimation, sampling synchronization and carrier tracking, space-time/frequency codecs.
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Size: 2463744 |
Author: 李继龙 |
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Description: 本文首先概述了OFDM 的原理、特征和关键技术，介绍了系统需要的几种同步。然后就同步误差对系统性能的影响进行了简单的分析，表明定时偏差和采样频率偏差将会引入码间干扰，载波频率偏差导致载波间干扰的发生。因此，在OFDM系统接收机中定时的确定、载波频率偏差和采样频率偏差的纠正是信号恢复的关键。之后对OFDM系统同步的几种实现方法进行了介绍，分析了各同步方法的性能。-The paper first outlines the principles of OFDM, features and key technologies, the system needs to introduce several synchronization. Synchronization error and then the impact on system performance for a simple analysis, show that the timing deviation and the sampling frequency deviation will introduce inter-symbol interference, the carrier frequency deviation led to the occurrence of ICI. Therefore, in OFDM system receiver to determine the timing, carrier frequency offset and sampling frequency offset correction signal to restore the key. After the OFDM system to achieve synchronization of several methods of introduction, an analysis of the performance of the synchronization method.
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Size: 268288 |
Author: dajinyu |
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Description: 读取wavepro7100的2进制文件头参数
返回4个参数：采样长度，增益，偏移量，时间间隔
ylj 2005.6.9-2 M wavepro7100 read file header parameters
The return of four parameters: the sampling length, gain, offset, time interval
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Size: 1024 |
Author: 李寅伟 |
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Description: Script for performance measurements for Carrier and Sampling Frequency
Offset Correction in OFDM Systems
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Size: 1024 |
Author: Ali |
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Description:
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Size: 1024 |
Author: Ali |
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Description: In this simulink model , baseband binary detection is simulated .A rectangular pulse shaped signal is given as input to the detector.The received signal is matched filtered and down-sampled .The effects of symbol timing offset can be seen by varying the phase of down-sampling operation.The binary signal transmitted is recovered
at the detector output.-In this simulink model , baseband binary detection is simulated .A rectangular pulse shaped signal is given as input to the detector.The received signal is matched filtered and down-sampled .The effects of symbol timing offset can be seen by varying the phase of down-sampling operation.The binary signal transmitted is recovered
at the detector output.
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Size: 7168 |
Author: quail |
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Description: In this simulink model , baseband 8-ary PAM detection is simulated .A half-sine pulse shaped PAM signal is given as input to the detector.The received signal is matched filtered and down-sampled .The effects of symbol timing offset
can be seen by varying the phase of down-sampling
operation.The 8-ary PAM signal transmitted is recovered
at the detector output.
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Size: 8192 |
Author: quail |
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Description: In this simulink model , 16-QAM modulation and demodulation is simulated .A square root raised cosine pulse shaped signal is modulated and given as input to the demodulator.The received signal
is demodulated and given to the detector where it is matched filtered and down-sampled .The effects of symbol timing offset
can be seen by varying the phase of down-sampling
operation.The signal transmitted is recovered
at the detector output.-In this simulink model , 16-QAM modulation and demodulation is simulated .A square root raised cosine pulse shaped signal is modulated and given as input to the demodulator.The received signal
is demodulated and given to the detector where it is matched filtered and down-sampled .The effects of symbol timing offset
can be seen by varying the phase of down-sampling
operation.The signal transmitted is recovered
at the detector output.
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Size: 9216 |
Author: quail |
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Description: In this simulink model , QPSK modulation and demodulation is simulated .A square root raised cosine pulse shaped signal is modulated and given as input to the demodulator.The received signal
is demodulated and given to the detector where it is matched filtered and down-sampled .The effects of symbol timing offset can be seen by varying the phase of down-sampling operation.The signal transmitted is recovered at the detector output.-In this simulink model , QPSK modulation and demodulation is simulated .A square root raised cosine pulse shaped signal is modulated and given as input to the demodulator.The received signal
is demodulated and given to the detector where it is matched filtered and down-sampled .The effects of symbol timing offset can be seen by varying the phase of down-sampling operation.The signal transmitted is recovered at the detector output.
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Size: 8192 |
Author: quail |
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Description: Simulink 实现的FM调制，载波13KHz，频偏3KHz，调制波形存为一个波形文件。FM解调采样双斜率鉴频，解调直接输出到声卡。-Simulink implementation of the FM modulation, carrier 13KHz, offset 3KHz, modulation waveform file saved as a waveform. FM demodulation of two-slope Kam sampling frequency, demodulated output directly to the sound card.
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Size: 25083904 |
Author: qinyn |
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Description: LF398采样保持器，由双极性绝缘栅场效应管组成，它具有采样速度快、保持下降速度慢、精度高等特点，采样时间小于6μs时精度可达O.01％；采用双极性输入状态可获得低偏置电压和宽频带；抗干扰能力强，不易受温度影响；芯片上的逻辑输入端均为具有低输入电流的差动输入，允许直接与TTL、PMOS和CMOS相连，差动门限为1.4 V，电源电压可在士5 V和±18 V之间变化．-LF398 sample and hold device, the insulated gate bipolar field effect transistor formed, it has a sampling speed, to keep down slow, high precision, when the sampling time is less than 6μs accuracy up to O.01 with bipolar input state can achieve low offset voltage and wide bandwidth anti-interference ability, easily affected by temperature chip logic inputs are differential with low input current input, allowing direct and TTL, PMOS and CMOS linked differential threshold is 1.4 V, power supply voltage of ± 5 V and ± 18 V between the changes.
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Size: 57344 |
Author: 梁珠 |
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Description: An inductive feedback technique increases the speed
of resonant circuits by 62 , allowing operation near the of
transistors. The technique leads to a fundamental oscillator operating
at 128 GHz with a power dissipation of 9 mW and a phase
noise of 105 dBc/Hz at 10-MHz offset. A divide-by-two circuit
based on the idea and incorporating a sampling mixer achieves a
maximum speed of 125 GHz while consuming 10.5 mW. The prototypes
have been fabricated in 90-nm CMOS technology.-An inductive feedback technique increases the speed of resonant circuits by 62 , allowing operation near the of transistors. The technique leads to a fundamental oscillator operating at 128 GHz with a power dissipation of 9 mW and a phase noise of 105 dBc/Hz at 10-MHz offset. A divide-by-two circuit based on the idea and incorporating a sampling mixer achieves a maximum speed of 125 GHz while consuming 10.5 mW. The prototypes have been fabricated in 90-nm CMOS technology.
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Size: 1960960 |
Author: 吕凌 |
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Description: Main Features
• Quad ADC with 8-bit Resolution
– 1.25 Gsps Sampling Rate in Four-channel Mode
– 2.5 Gsps Sampling Rate in Two-channel Mode
– 5 Gsps Sampling Rate in One-channel Mode
– Built-in four-by-four Crosspoint Switch
• 2.5 GHz Differential Symmetrical Input Clock Required
• ADC Master Reset (LVDS)
• Double Data Rate Output Protocol
• LVDS Output Format
• Digital Interface (SPI) with Reset Signal
– Selectable 1:1 or 1:2 Demultiplexed Outputs
– Channel Mode Selection
– 500 mVpp or 625 mVpp Analog Input (Differential AC or DC
Coupled)
– Selectable Bandwidth (Four Available Settings)
– Gain Control (±18 )
– Offset Control (±50 mV)
– Phase Control (±14 ps Range)
– Standby Mode (Full or Partial)
– Binary or Gray Coding Selection
– Test Mode
• Power Supplies: 3.3V and 1.8V (Outputs), 1.8V (Digital)
• Power Dissipation: 4.2W Total (1:1 DMUX Mode)-Main Features
• Quad ADC with 8-bit Resolution
– 1.25 Gsps Sampling Rate in Four-channel Mode
– 2.5 Gsps Sampling Rate in Two-channel Mode
– 5 Gsps Sampling Rate in One-channel Mode
– Built-in four-by-four Crosspoint Switch
• 2.5 GHz Differential Symmetrical Input Clock Required
• ADC Master Reset (LVDS)
• Double Data Rate Output Protocol
• LVDS Output Format
• Digital Interface (SPI) with Reset Signal
– Selectable 1:1 or 1:2 Demultiplexed Outputs
– Channel Mode Selection
– 500 mVpp or 625 mVpp Analog Input (Differential AC or DC
Coupled)
– Selectable Bandwidth (Four Available Settings)
– Gain Control (±18 )
– Offset Control (±50 mV)
– Phase Control (±14 ps Range)
– Standby Mode (Full or Partial)
– Binary or Gray Coding Selection
– Test Mode
• Power Supplies: 3.3V and 1.8V (Outputs), 1.8V (Digital)
• Power Dissipation: 4.2W Total (1:1 DMUX Mode)
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Size: 3200000 |
Author: 郭福珍 |
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Description: 本文提出了数字与模拟
相结合的自适应对消方案。通过对发射天线耦合过来的参考信号进行采样，转
换为数字信号后输入信号处理器中经调幅调相处理，再经过DAC转换并放大
后和接收机接收干扰信号相抵消，抵消残留信号再采样转换为数字信号后输入
到信号处理器中调整调幅调相的权值，重复上述过程，形成模拟和数字相结合
的自适应干扰抵消，最终使干扰噪声得到了衰减。
-This paper presents a combination of digital and analog adaptive cancellation scheme. By transmitting antenna coupled to sample over the reference signal, converted to digital signal processor input signal by amplitude modulation phase modulation process, through the DAC conversion and amplification and interference signals received by the receiver offset, offset the residual signal re-sampling conversion After the digital signal input to signal processor to adjust the weights of amplitude phase modulation, repeat the process, the formation of a combination of analog and digital adaptive interference cancellation, ultimately interfering noise has been attenuated.
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Size: 1251328 |
Author: 赵亮 |
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Description: AD采样频率为10K，序列发生器SEQ1和SEQ2级联成一个16通道的序列发生器，
* 采样模式采用顺序采样。利用通用定时器T1的周期中断来触发AD转换。
ADCINA0和ADCINB0为参考电平，对ADCINA0,ADCINA1，ADCINB0，ADCINB1连续10次采样，然后分别排序，滤波，取均值，用A0，B0的值计算增益和偏移量，用来校正A1，B1-AD sampling frequency of 10K, the sequence generator SEQ1 and SEQ2 cascaded into a 16-channel sequencer,* sampling mode with sequential sampling. The use of general-purpose timer interrupt to trigger the cycle T1 AD converter. ADCINA0 and ADCINB0 the reference level, the ADCINA0, ADCINA1, ADCINB0, ADCINB1 10 consecutive samples, then were sorting, filtering, taking the mean, with A0, B0 the value gain and offset used to correct the A1, B1
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Size: 306176 |
Author: yu hao |
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Description: This paper considers the design of linear
frequency-domain receivers with oversampling for OQPSK
(Offset Quaternary Phase Shift Keying) signals. Based on
a receiver structure able to eliminate the residual interference
between in-phase (I) and quadrature (Q) components
at the sampling instants, a method that minimizes the
overall residual ISI (Inter-Symbol Interference) plus IQI
(I-Q interference) is proposed. Therefore, this receiver significantly
outperforms previous frequency-domain OQPSK
receivers.
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Size: 284672 |
Author: 吕立圣 |
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Description: This paper considers receiver designs for
SC-FDE schemes (Single-Carrier with Frequency-Domain
Equalization) employing M-ary OQAM signals (Offset
Quadrature Amplitude Modulation). It is shown that the
interference between the in-phase (I) and quadrature (Q)
components at the sampling points can lead to severe
performance degradation. Therefore, receivers without
residual I-Q interference (IQI), as well as receivers with
IQI cancellation were developed. Our performance results
show that the new receivers are suitable to M-ary OQAM
schemes.
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Size: 421888 |
Author: 吕立圣 |
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Description: ofdm系统中采样偏差的估计与补偿，很好的文章，基本硬件实现都采用这种方法-sampling bias in estimation and compensation in ofdm systems, good article, the basic hardware implementations using this method
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Size: 231424 |
Author: shangchunjie |
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Description: 输入信号: cm.txt 含有胎儿和母亲的心电信息的混合心
电信号.
mother1024.txt 母亲的心电信号
参数: 抽样频率:200Hz
数据长度:1024
要求: 用自适应滤波的LMS算法抵消掉混合心电信号中
母亲的心电信号。
注意u和N的选取，在报告中说明u和N的选取对滤
波结果的影响。
自适应滤波By莫小凯-Input signal: cm.txt containing the fetus and the mother of ECG information mixed ECG mother1024.txt mother ECG parameters: sampling frequency: 200Hz data length: 1024 requirements: LMS adaptive filtering algorithm offset mixed ECG ECG mother. Note that the selection of u and N u and N selection filtering results in the report. By Mo Oscar adaptive filtering
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Size: 92160 |
Author: moxiaokai |
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Description: this code is proposed for modeling the sampling clock offset (SCO)/ppm in communication transmitter and receiver
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Size: 1795 |
Author: hamidmsadeghi87 |
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