Wired channels are
a) Lossy
b) Lossless c) Lossy & Lossless d) None of the mentioned

The equivalent temperature in a receiver design must be kept
a) Low
b) High c) Does not affect the receiver d) None of the mentioned

Which corrects the sampling time problem in a digital system?
a) Interpolator
b) Decimator c) Equalizer d) Filter

Transmission media used in low frequency band are
a) Air
b) Water c) Copper cable d) All of the mentioned

Transmission media used for medium frequency band are
a) Coaxial cable
b) Copper cable c) Optical fiber d) All of the mentioned

Matched filter technique is used to
a) Increase SNR
b) Decrease SNR c) SNR is not affected d) None of the mentioned

Matched filter can also be used as least squares estimator.
a) True
b) False

Digital communication system can handle
a) Analog signals
b) 1D signals c) 2D signals d) All of the mentioned

The information source of a digital communication system can be
a) Packetized
b) Continuous c) Packetized & Continuous d) None of the mentioned

The basic transmission-reception system is a ______ system.
a) Two block system
b) Three block system c) Four block system d) None of the mentioned

Modulation channel consists of
a) Amplifier
b) Signal processing units c) Amplifier & Signal processing units d) None of the mentioned

If operating frequency bands are higher ______ is available.
a) Smaller bandwidth
b) Larger bandwidth c) Smaller & Larger bandwidth d) Cannot be determined

Channel coding relates to area such as
a) Waveform coding
b) Structured sequence c) Waveform coding & Structured sequence d) None of the mentioned

Examples of structured sequences are
a) Block codes
b) Convolutional codes c) Turbo codes d) All of the mentioned

. In orthogonal signalling as k increase there is
a) Improved error performance
b) Degraded error performance c) Improved bandwidth d) None of the mentioned

In orthogonal signal, all cross correlation coefficients are
a) One
b) Zero c) Negative d) None of the mentioned

The smaller the cross correlation, the ______ is the distance between the signal vectors.
a) More
b) Less c) Double d) Half

Biorthogonal set consists of
a) Orthogonal signals
b) Antipodal signals c) Combination of orthogonal and antipodal d) None of the mentioned

Which codes perform better?
a) Orthogonal
b) Biorthogonal c) Orthogonal & Biorthogonal d) None of the mentioned

Biorthogonal codes needs ________ bandwidth as orthogonal codes.
a) Equal
b) Double c) Half d) Triple

Which code requires minimum Eb/N0?
a) Orthogonal
b) Biorthogonal c) Simplex d) All of the mentioned