Exam 16: Advanced Data Communications Topics

__________ has been defined as the process of combining an input signal m(t)and a carrier at frequency fc to produce a signal s(t)whose bandwidth is (usually)centered on fc.

With the exception of the repeat-accumulate code,the LDCP code is systematic.

To compute an error-locator polynomial and solve for its roots is a technique for BCH decoding proposed by ________ .

A ____________ code takes a fixed-length input and produces a fixed-length check code.

The _________ is the ratio of the amplitude of the input signal to the carrier.

Bose-Chaudhuri-Hocquenghem is an example of a _________ code.

Voice signals are transmitted over telephone lines at their original spectrum,which is referred to as __________ transmission.

_________ modulation is the simplest form of modulation.

The ratio of data bits to total bits,k/n,is called the _________ .

The syndrome indicates which of the individual parity-check equations do not equal 0.

__________ codes are among the most powerful cyclic block codes and are widely used in wireless applications.

__________ is a basic characteristic of a signal used for modulation.

The ratio of redundant bits to data bits,(n - k)/k,is called the _______ of the code.

Cyclic codes can be easily encoded and decoded using __________ registers.

The ________ is a measure of how much additional bandwidth is required to carry data at the same data rate as without the code.

For a parity-check code there are three functions to perform: encoding,error detection,and __________ .

LDPC codes cannot be efficiently implemented for high-speed use.

With a nonsystematic code it is more difficult to determine a technique for generating a codeword from a block of data bits.

The LFSR implementation of a cyclic error-correcting encoder is the same as that of the CRC error-detecting code.

_________ codes are a widely used subclass of nonbinary BCH codes.