It's time to write something

本文作者是一名已工作近两年的研究生,在感慨时光流逝的同时决定开始记录自己的思考与成长。通过分享那些触动心灵的文章来激励自己不断前行。

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研究生毕业工作已经快两年了,时常若有所思,却不曾记录下什么了,我想,是时候该写点什么了。当然并不是说我已经准备好了,而是每当看到让我怦然心动,脑洞大开的文章时,总是叹为观止,长跪不起,而后想想自己如果现在还不出发,可能永远也到不了彼岸。

转载于:https://www.cnblogs.com/joluo/p/4483044.html

Sending data You must be able to start and stop transmission on command from MATLAB. This means that there needs to be two MATLAB functions for transmitting (or possibly the same function that takes multiple input parameters). The first command should start the transmission of the signal of our choice; it should write the signal to the memory. When the transmitter is started, it should loop the signal until we call it to stop. This looping is necessary due to how the test equipment in the lab functions. For example: transmit_start (signal) The second command should stop the transmission. For example: transmit_stop Note that when sending the pilot sequence of symbols (see below about the pilot) is handled entirely in MATLAB and there is no need to deal with it explicitly in your part . Receiving data When receiving data, there is a known pilot sequence that signals that the data starts. The pilot is known by both the transmitter and the receiver. The pilot sequence can have varying length and is an arbitrary sequence of QAM symbols. The FPGA then searches for the pilot sequence in the data stream by performing a cross-correlation between the pilot sequence and the received data stream. If the correlation detects a significant peak, the pilot is detected and the data is retrieved in MATLAB. It is important that the receiver runs on a timer such that after a certain time if no signal is detected, the receiver function will return whatever is in the memory. The timeout can be set to a fixed time to begin with, let’s say 10 seconds. The function needs to indicate whether or not the pilot was detected, since this is important for debugging purposes. Lise suggests that the value of the maximum correlation is enough to feed back. Since the signal will be noisy, there will only be a probability that the signal is detected (it not a 0 or 1 value). Lise suggests to use “if max(xcorr(pilot,rx_signal)) > 0.3, status = DETECTED” or something similar.
03-21
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