Digital Communication

Fundamentals

100

The rearrangement of the data sequence is called _

Scrambling

200

The modulation techniques are categorized into

Binary Signaling

M-array Signalling

Quadrature Amplitude modulation

300

In amplitude shift keying the 1 and 0 is denoted by

Acosωct, 0

400

The total number of non zero bits in code is known as _________

Code Weight

Model

100

 The probability of error of amplitude shift keying is given by

Pe=1/2 erfc {E/4N0}

200

The change in amplitude of carrier in accordance to the digital message signal then it is called as

Amplitude Shift Keying

300

The bit change corresponds to 450 phase change in

Quadrature Phase Shift Keying

400

The number of one’s in output code is even in ______

Even Parity

Tx Design

100

The properties of line encoding are

Error detection & correction capability

200

__________ is the non coherent mode of binary phase shift keying

DPSk

300

Which one comes under block code?

Block Code

400

 ________ parity check detects only one error

Vertical

Rx Desing

100

Why scrambling is required?

Data security

200

The maximum rate of information from transmitter to receiver is known as ___________

Code Length

300

Which code doesn’t have memory?

Block Code

400

Which one is the type of generation of cyclic code?

Non-Systematic Code

Applications

100

In bipolar line encoding 1 and 0 is represented as _

0 →0, 1 →p(t)

200

Which code does have memory elements?

Convolution Code

300

The code efficiency in block code is denoted by ________

k/n

400

In which type of cyclic code generation the position of parity bits are well defined?

systematic Code