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Description: 利用AT89S51单片机的T0、T1的定时计数器功能，来完成对输入的信号进行频率计数，计数的频率结果通过8位动态数码管显示出来。要求能够对0－250KHZ的信号频率进行准确计数，计数误差不超过±1HZ。-Use AT89S51 MCU T0, T1 timing counter function, to complete the input signal frequency counting, frequency counting results through eight dynamic digital tube display. Requires the ability to signal frequency 0-250KHZ for accurate counting, counting error does not exceed ± 1HZ.
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Size: 1024 |
Author: 王崎权 |
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Description: tune timing of read data command when crc error happen no performance impact.
-tune timing of read data command when crc error happen no performance impact.
Platform: |
Size: 3072 |
Author: gievinqeng |
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Description: 接收端采用的算法和程序流程与发送端发送的OFDM符号的帧结构有关系。具体的帧结构，以及定时估计，频偏估计，剩余误差跟踪的算法可参考算法说明文档。这里对程序的流程进行说明。
首先根据短训练字的特性进行相关运算，进行信号到达检测，当检测到相关值大于门限一定次数后，认为有信号到达。然后根据长训练字的特性，进行相关运算，进行OFDM符号FFT窗口起始位置的估计。估计出FFT窗口的位置后，先在时域进行小频偏的估计，将两个长训练字进行小频偏补偿后，进行FFT运算，根据FFT运算的结果进行整数倍频偏的估计。这些参数估计完成后，就可以进行数据解调了。先对数据部分进行完整的频偏补偿，然后根据估计的FFT窗口位置进行FFT运算得到频域的数据，进行解调。然后在对应于导频的子载波位置上提取出导频信息，根据导频信息估计出剩余定时误差以及剩余的信道响应误差，将误差量送入环路进行跟踪。当收到所有数据后，重新回到信号到达检测状态，进行下一次信号到达的检测和信号接收。
-The receiving end uses the algorithm and the program flow and the frame structure of the OFDM symbol transmitted by the sending end. Specific frame structure, and timing estimation, frequency offset estimation, residual error tracking algorithm can refer to the documentation. Here to illustrate the process of the program.
First, according to the characteristics of the short training word correlation operation, the signal reaches the detection, when the correlation value is greater than the threshold of a certain number of times, that there is a signal to reach. Then, according to the characteristics of the long training word, the correlation operation is carried out, and the initial position of the OFDM symbol FFT is estimated. The estimated position of the FFT window, first in the time domain for small frequency offset estimation, two long training word for small frequency offset compensation, the FFT operation. According to the result of FFT for integer frequency bias estimation. Af
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Size: 34816 |
Author: shinfer |
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Description: 本程序是为测试一卡通服务器是否可用而写的。定时检测服务器是否可用，如果不可用则发邮件提醒，并记录下错误信息，供查找故障原因。
-This procedure is to test the card and write the server is available. Timing detection server is available, if not available then mail alerts, and record the error message, find out the reasons for failure.
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Size: 3546112 |
Author: lwj |
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Description: Check the clock frequency & that the baud rate required can be achieved. Error of <1 is never a problem, <2 will work but is undesirable, 5 will not work. Note that this assumes that the other end of the link has perfect timing, which will normally be true for a PC or USB serial port. If the other end of the link is another microcontroller check its exact baud rate and try to match that. Check the serial link configuration which must match the other end - most common is 8 bit, no parity, 1 stop bit.-Check the clock frequency & that the baud rate required can be achieved. Error of <1 is never a problem, <2 will work but is undesirable, 5 will not work. Note that this assumes that the other end of the link has perfect timing, which will normally be true for a PC or USB serial port. If the other end of the link is another microcontroller check its exact baud rate and try to match that. Check the serial link configuration which must match the other end - most common is 8 bit, no parity, 1 stop bit.
Platform: |
Size: 121856 |
Author: FARHAD RABIEI2 |
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Description: Park均方误差程序说明，做定时同步和载波同步的误差算法。(Park mean square error procedures that do timing synchronization and carrier synchronization error algorithm.)
Platform: |
Size: 1024 |
Author: 日月当空
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Description: MFC写的定时关机程序，可实现24小时内定时关机，误差1s。(MFC written timing shutdown procedures, can achieve a 24-hour timing shutdown, error 1s.)
Platform: |
Size: 328704 |
Author: dipts_ |
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