Q. Direct system allows detection of signals whose psd level is

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Q. Spread spectrum is a ______ technique.

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Q. Spread spectrum can be used to transmit

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Q. Spread spectrum makes ______ difficult.

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Q. Spread spectrum has immunity from

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Q. The width of each channel in frequency hopping spread spectrum corresponds to

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Q. The transmitter of frequency hopping system is fed with encoding scheme such as

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Q. Which filter is used to get the final FHSS signal?

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Q. In CDMA the incoming signal is _____ with the spreading code.

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Q. The original bandwidth of the unspread signal in spread spectrum is ____ to data rate.

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Q. In DSSS the signal is recovered using

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Q. Multiple isolated peaks in multipath components is called as

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Q. If delay time is greater than symbol time, _______ fading occurs.

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Q. If delay time is lesser than symbol time, ______ fading occurs.

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Q. When channel coherence bandwidth is greater than the transmitted signal bandwidth ______ occurs.

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Q. Channel’s time spreading properties are

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Q. When channel coherence time is less than the time duration of a transmission symbol, then ______ fading occurs.

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Q. Minimum time required for magnitude change or phase change is called as

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Q. When a user’s moving, the user’s velocity causes shift in frequency. This is called as

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Q. Coherence time is _______ to Doppler spread.

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