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Spread Spectrum In spread-spectrum communications, the main carrier frequency is rapidly varied independently of signal modulation, and the receiver is programmed to follow As a result, the probability of catastrophic interference, in which one strong interfering signal can obliterate the desired signal, is near zero It is difficult for unauthorized people to eavesdrop on a spread-spectrum communications link unless they gain access to the sequencing code, also known as the frequency spreading function Such a function can be complex, and can be kept secret If the transmitting and receiving operator do not divulge the function to anyone, and if they do not tell anyone about the existence of their contact, then no one else on the band will know the contact is taking place During a spread-spectrum contact between a given transmitter and receiver, the operating frequency can fluctuate over a range of kilohertz, megahertz, or tens of megahertz As a band becomes occupied with an increasing number of spread-spectrum signals, the overall noise level in the band appears to increase Therefore, there is a practical limit to the number of spread-spectrum contacts that a band can handle This limit is roughly the same as it would be if all the signals were constant in frequency, and had their own discrete channels A common method of generating spread spectrum is frequency hopping The transmitter has a list of channels that it follows in a certain order The receiver must be programmed with this same list, in the same order, and must be synchronized with the transmitter The dwell time is the interval at which the frequency changes occur, which is the same as the length of time that the signal remains on any given frequency The dwell time should be short enough so that a signal will not be noticed, and not cause interference, on any frequency There are numerous dwell frequencies, so the signal energy is diluted to the extent that, if someone tunes to any particular frequency in the sequence, the signal is not noticeable Another way to get spread spectrum, called frequency sweeping, is to frequency-modulate the main transmitted carrier with a waveform that guides it up and down over the assigned band This FM is independent of signal intelligence A receiver can intercept the signal if, but only if, its tuning varies according to the same waveform, over the same band, at the same frequency, and in the same phase as that of the transmitter.

ALTER TABLE dbo.S SWITCH TO dbo.P PARTITION 1;

3 Add a set statement that assigns the text returned property of the result to a variable:

Once the data is out of partition 1, you can remove the boundary value for it using the MERGE option of the ALTER PARTITION FUNCTION command, and it ll merge into its neighboring partition.

Refer to the text in this chapter if necessary A good score is at least 18 correct Answers are in the back of the book 1 A radio wave has a frequency of 155 MHz The highest modulating frequency that can be used effectively is about (a) 155 kHz (b) 155 kHz (c) 155 kHz (d) 155 MHz 2 The reflected wave (a) arrives in phase with the direct wave (b) arrives out of phase with the direct wave (c) arrives in a variable phase compared with the direct wave (d) is always horizontally polarized