How are bits transmitted using DSSS? Include the chipping code in your answer.
What will be an ideal response?
DSSS uses an expanded redundant code to transmit each data bit and then a modulation technique such as quadrature phase shift keying (QPSK). This means that a DSSS signal is effectively modulated twice. Instead of simply encoding these two bits over a carrier wave for transmission, the value of each data bit is first added to each individual 1 and 0 in a sequence of binary digits called a Barker code. A Barker code (or chipping code) is a particular sequence of 1s and 0s that has properties that make it ideal for modulating radio waves as well as for being detected correctly by the receiver. These 1s and 0s are called chips instead of bits to avoid confusing them with the actual data bits. The chipping code is sometimes called a pseudorandom code because it is usually derived through a number of mathematical calculations as well as through practical experimentation.
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Answer the following statement(s) true (T) or false (F)
1. By controlling the ohms supplied to the motor windings, a wide range of motor speeds can be obtained. 2. The essential features and parts of DC motors and generators are the same. 3. The direction of armature rotation of a DC motor depends on the direction of the current in the field and armature circuits. 4. Normal or base speed for a DC motor is obtained by connecting full voltage to both the armature and shunt field. 5. Three factors limit the current taken by the armature from a DC source.
What does the abbreviation GFP stand for?
A. Ground-Field Protector B. Ground-Fire Prevention C. Ground-Fault Protector D. Ground-Flux Prevention
If the time for one cycle is 0.1 second, the frequency is _____
a. 0.1 Hz b. 0.5 Hz c. 1 Hz d. 10 Hz
86.83 is read as 86 and 83 ____________________.
Fill in the blank(s) with the appropriate word(s).