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The coded modulation is 8-PSK. and the un coded reference is 4-PSK. The trellis structure is formed from time tkto time tk.
For MPSK modulation, bandwidth efficiency increases with higher-dimensional signaling, but for MFSK, it decreases. Explain why this is the case.
Consider the assortment of signaling elements that flow through a typical system. and describe the subtle energy and rate transformations.
Binary phase shift keying (BPSK) and quaternary phase shift keying (QPSK) as manifesting the same bit-error-probability relationship.
Although trellis-coded modulation schemes do not require additional bandwidth or power, their use still involves a trade-off.
When using TCM, how much waveform redundancy is sufficient to realize the benefits of coding (improved error performance or increased capacity)?
In a TCM trellis diagram, when are parallel paths required in order to comply with the linger boeek partitioning rules? What is the result of violating.
A high-performance aircraft is transmitting an un modulated carrier signal to a ground terminal. The ground terminal is initially in phase lock with the signal.
Show that the loop bandwidth of a first-order phase-locked loop is given by BL = K0/4, where Kr, is the loop gain.
A first-order phase-locked loop with loop gain K0 is disturbed by additive white Gaussian noise of normalized (to unit signal energy).
What are the consequences of the Viterbi decoding algorithm not yielding a posteriori probabilities?
Describe the similarities and differences between implementing a Viterbi decoding algorithm and implementing a maximum a posteriori (MAP) decoding algorithm?
Consider a voice-grade telephone circuit with a bandwidth of 3 kHz. Assume that the circuit can be modeled as an AWGN channel.
Consider that a 100-kbits/s data stream is to be transmitted on a voice-grade tele-phone circuit (with a bandwidth of 3 kHz).
A given source alphabet consists of 300 words, of which 15 occur with probability 0.06 each and the remaining 285 words occur with probability 0.00035 each.
Find the required capacity if 100 of the possible brightness-color combinations occur with a probability of 0.003 each.
Compute the equivocation or message uncertainty in bits per character for a textual transmission using 7-hit ASCII coding.
Suppose a binary non coherent FSK link has a maximum data rate of 2.4 kbits/s with-out ISI over a channel whose nominal bandwidth is 2.4 kHz.
Table characterizes four different satellite-to-earth-terminal links. For each link assume that the space loss is 196 dB.
You are required to make modulation and error-correction code choices for a real-time communication system operating over an AWGN channel.
You are required to provide a real-time communication system to support 9600 bits/s with a required bit-error probability.
For a fixed error probability. show that the relationship between alphabet size M and required average power for MPSK versus QAM can be expressed.
Explain why a syndrome can be calculated by evaluating the received polynomial at each of the roots of the code's generator polynomial.
Explain why the curves in Figure of the text show error-performance degradation at low values of code rate.
Consider a turbo code consisting of two, four state convolutional codes as the com-ponent codes.