List three spread spectrum techniques, and give a general description of each.
What will be an ideal response?
Common spread spectrum techniques and their general description is given below:
? DSSS (Direct Sequence Spread Spectrum): Similar to CDMA where a sender multiplies the
outgoing data by a sequence to form multiple frequencies and the receiver multiplies by the
same sequence to decode
? FHSS (Frequency Hopping Spread Spectrum ): A sender uses a sequence of frequencies to
transmit data, and a receiver uses the same sequence of frequencies to extract data
? OFDM (Orthogonal Frequency Division Multiplexing ): A frequency division multiplexing
scheme where the transmission band is divided into many carriers in such a way that the
carriers do not interfere
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Name a piece of software you often use where it is easy to produce an error. Explain ways you could improve the interface to better prevent errors.
What will be an ideal response?
Suppose you enter 34.3 57.8 789, then press the ENTER key. Analyze the following code.
``` Scanner input = new Scanner(System.in); int v1 = input.nextInt(); int v2 = input.nextInt(); String line = input.nextLine(); ``` a. After the last statement is executed, v1 is 34. b. The program has a runtime error because 34.3 is not an integer. c. After the last statement is executed, line contains characters '7', '8', '9', '\n'. d. After the last statement is executed, line contains characters '7', '8', '9'.