Exam 16: Advanced Data Communications Topics

Modulation does not permit frequency-division multiplexing.

For unguided transmission it is virtually impossible to transmit baseband signals.

Amplitude modulation is a linear process and produces frequencies that are the sum and difference of the carrier signal and the components of the modulating signal.

RS codes are well suited for burst error correction.

In the case of the CRC,a particular cyclic code can be represented by a polynomial divisor,called the ___________ .

(A)Process received bits to compute the syndrome code in exactly the same fashion as the encoder processes the data bits to produce the check code; (B)if the syndrome bits are all zero,no error has been detected; and (C)if the syndrome is nonzero,perform additional processing on the syndrome for error correction,-- is the procedure for the decoding of a _________ code.

With __________ codes,data are processed in chunks of m bits,called symbols.

________ codes make highly efficient use of redundancy and block lengths and symbol sizes can be easily adjusted to accommodate a wide range of message sizes.

SSB is a variant of AM that requires only half of the bandwidth.

A _________ code takes an input of arbitrary length and produces a fixed-length CRC check code.

___________ rule demonstrates that both FM and PM require greater bandwidth than AM.

Frequency modulation and phase modulation are special cases of _________ modulation.

__________ proposed an approach for the construction of LDPC codes by defining the LDPC parity-check matrix.

DSBSC filters out the carrier frequency and sends both sidebands but does not use as much power and bandwidth as DSBTC.

An LDPC construction technique that results in a systematic code is called a__________ code.

Special cases of angle modulation are frequency modulation and ________ modulation.

When only analog transmission facilities are available,modulation is required to convert the digital data to analog form.

The principal techniques for modulation using analog data are amplitude modulation,frequency modulation,and phase modulation.

Many of the error-correcting block codes that are in use are in a category called ________ .

Reed-Solomon is an example of a ________ code.