ELG4179_Final_2016_1.docx-1

A. How many numbers of constellation points exist in phase for 3bit ASK?  B. What happens to the radio wave propagation when the frequency is below critical angle? C. If the mark frequency and space frequency are same then what happens to FSK? D. What is the Carson’s rule? E. What is the Maximum data rate in a minimum channel bandwidth is ? F. What is radio horizon and where is it used? G. What are the phase angle limitations of a BPSK? H. What is the change in channel capacity when two number of bits are increased?

Design a direct sequence spread spectrum (DSSS) system to operate in an environment where the power of an interfering signal is 400 times more than the desired signal power. Consider the total system losses to be 5 dB and the output S/N ratio to be 7 dB. The information rate is 256 kbps. Calculate the following: 4.1.1 The jamming margin. 4.1.2 The minimum process gain. 4.1.3. The minimum required RF bandwidth (in Mhz). 4.1.4. The required code generator clock rate.

Problem 2: Consider a DSB-SC system: modulating signal: m(t)= 2 cos4000 πt +5 cos 6000 Jit carrier signal: c(t) = 100 cos 257fct where f= 50kHz. Determine and sketch the spectrum of the modulated signal.

For an H3E system with 80 percent modulation, what would be the i.) total transmitted power in W and ii.) remaining sideband power in W of the AM signal if the unmodulated carrier power is 1kW?

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Consider a fast hopping binary ASK system. The AWGN spectrum equals Sn (f) = 10-6 and the binary signal amplitudes are 0 and 2 V, respectively. The ASK uses a data rate of 100 kbit/s and is detected noncoherently. The ASK requires 100 kHz bandwidth for transmission. However, the frequency hopping is over 12 equal ASK bands with bandwidth totaling 1.2 MHz. The partial band jammer can generate a strong Gaussian noise-like interference with total power of 27 dBm.    (a) If a partial band jammer randomly jams one of the 12 FH channels, derive the BER of the FH-ASK if the ASK signal hops 6 bands per bit period.    (b) If a partial band jammer randomly jams two of the 12 FH channels, derive the BER of the FH-ASK if the ASK signal hops 6 bands per bit period.    (c) If a partial band jammer jams all 12 FH channels, derive the BER of the FH-ASK if the ASK signal hops 6 bands per bit period.

Problem 3) Consider a coherent homodyne receiver (as shown in the figure below) used in a binary intensity modulated system with multiple inline optical amplifiers at 1550nm wavelength. Signal P SNR PIN Noise PASE LO

6.a. Which of the following can you accurately measure using an OSA?A. Signal power in a channel onlyB. Spectral width of a channel onlyC. Center wavelength of a signal onlyD. Signal power and spectral width of a channel and center wavelength of a signal6.b. Which instrument should you use to determine the receiver sensitivity threshold during a receiver sensitivity test?A. BER testerB. OTDRC. Reel testerD. Variable optical attenuator

Fast please @sync1

Binary data are transmitted at rate of 10 bit/sec, over a microwave link having a BW of 3MHZ.Assume that the noise power spectrum density (PSD), at the receiver i/p is -10 = 10 W/Hz. Find the average power required at the receiver i/p for Coh. FSK (synch. FSK) and DPSK Signaling schemes to maintain probability of error less than or equal to 10.