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?
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?
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
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Transcribed Image Text: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=150B, 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 103, what adjustment
should the node make?
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