Rate adaptation technology is widely used in wireless environment. In the below example shown in the following figure, three possible modulation technologies can be used, leading to three different data sending rates. Answer the following questions: A. What does SNR mean? Why do we need rate adaption technology? B. Suppose a mobile wireless node was in a position (middle spot in the graph) with SNR= 20DB.If this node moves to a new location with SNR=15DB, how many times does the bit error rate (BER) increase? Provide an estimate. C. After this movement, if we require the bit error rate (BER) not to exceed 10-3, what adjustment should the node make?

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