Q. Irreducible BER floor is created in frequency selective channels due to ____________

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Q. Which of the following is specified by a specific number of bit errors occurring in a given transmission?

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Q. Bit error rate provides the information about the type of error.

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Q. In fast frequency hopping, hopping rate is less than the information symbol rate.

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Q. FH systems do not have collisions.

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Q. The processing gain of FH systems is given by ratio of _______

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Q. The bandwidth of the channel used in the hopset is called _________

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Q. What is the set of possible carrier frequencies in FH-SS?

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Q. Frequency hopping involves a periodic change of transmission _______

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Q. DSSS system spreads the baseband signal by ________ the baseband pulses with a pseudo noise sequence.

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Q. The period of a PN sequence produced by a linear m stage shift register cannot exceed _____ symbols.

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Q. PN sequence can be generated using sequential logic circuits.

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Q. Which of the following is not a characteristic of PN sequence?

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Q. Which of the following is not a property of spread spectrum techniques?

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Q. Why spread spectrum technique is inefficient for a single user?

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Q. The transmission bandwidth of spread spectrum techniques is equal to the minimum required signal bandwidth.

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Q. Power efficiency of M-ary FSK increases, since _________

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Q. The bandwidth efficiency of an M-ary FSK signal ________ with ________ in M.

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Q. In comparison to M-ary PSK, M-ary QAM bandwidth efficiency is _____ and power efficiency is ________

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Q. M-ary QAM signal have constant energy per symbol.

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