One approach to using Walsh code in a CDMA system is to assign a code permanently to each subscriber. What are the advantages, disadvantages, or limitations of such an approach?
What will be an ideal response?
Advantages of this scheme are that we can have the code encoded in the smart
card, and hence the user can access it faster and achieve faster communications.
The disadvantage comes at the security involved. If the same user keeps on
using the same codes over and over, then a patient hacker can eavesdrop and
eventually figure out the codes and can use them for malicious purposes. The
limitation to this approach is that because these codes are orthogonal, then we
are limited by the number of codes we can generate. Therefore, a user who is
assigned a code and is not using it represents a wasted resource that can be used
by another user.
You might also like to view...
In the case of internal threads, the thread length is specified as the ____.
A. depth of thread B. height of thread C. width per thread D. length per thread
Which form of matter has neither a definite shape nor definite volume?
A) Solid B) Liquid C) Gas
Safety glasses, safety goggles or a face shield are required when workers are exposed to which of the following?
A. Flying particles B. Molten metal C. Liquid chemicals D. All answers are correct
The unit of measurement of an AC voltage measured on an oscilloscope is ____.
A. peak B. peak to peak C. average D. rms