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the noncoherent demodulator for binary fsk uses as the decision statistic the square root of the sum of the squares of
suppose that a bpsk waveform is received with a phase error of theta but nevertheless is demodulated by using a
a qpsk demodulator is designed to put out a null signal called an erasure when the decision is ambivalent specifically
a construct a four-ary orthogonal signaling waveform alphabet of duration t by using a half-cosine pulse of pulsewidth
1 a sketch a noncoherent binary fsk demodulator at complex baseband for signaling pulses that have both a real part and
a noncoherent demodulator for an m-ary orthogonal signaling alphabet flags the demodulated output symbol as unreliable
a received baseband waveform for digital communication in white noise iswhere st is the transmitted pulse such that st
a derive the maximum-likelihood demodulator for m-ary orthogonal signaling with no intersymbol interferenceb by
1 sketch in detail a complete functional block diagram of a coherent receiver for offset qpsk including carrier
1 based on the maximum-likelihood principle develop and sketch a phase synchronization procedure for a binary ook
a given digital communication system for a passband dual polarization channel uses four-dimensional modulation
with data treated as a random nuisance parameter derive the likelihood function for the phase of a binary fsk waveform
the maximum-likelihood estimator developed in problem 86 can be used bit by bit to estimate the phase on every received
a with data treated as a random nuisance parameter develop a maximumlikelihood procedure for finding a marker
in a partially-coherent channel the phase angle is not known but it changes so slowly with respect to the bit rate that
1 construct a list of all complementary codes of block length 4 how many pairs are there on the list show that
the modified duobinary partial-response signaling waveform has the generator polynomial gx 1 - x2a find the impulse
partial-response signaling can also be used when the input to the channel takes more than two amplitudesa describe a
a partial-response waveform can be designed by using any nyquist pulse in place of the sinc pulsea what is the
a by examining the trellis for duobinary partial-response signaling show that there are some paths that have an
a a hamming 7 4 code is used to correct errors on a binary symmetric channel with error probability what is the
let n 2r-1 and consider a binary word of block length n how many binary words are there that differ from the given
a systematic generator matrix for a 21 convolutional code is given bya what is the free hamming distance of this
a diversity communication system uses two diversity channels and binary fsk signaling the two channels have identical
give an ad hoc estimator for the amplitude of a coherent binary fsk waveform in additive gaussian noise when it is