Digital Communication

Satellite Orbital Mechanics Quiz Q.1)  Orbit has eccentricity of 0.15 and semi major axis of 9000 km. Determine Periodic time and Apogee height. Q.2)  For a satellite perigee & apogee height is 300 km and 42000 km respectively. Find velocities at apogee & perigee by assuming earth radius 6378 km. Q.3)  Sum & difference of apogee and perigee distances are 50000 km & 30000 km for a certain elliptical satellite orbit. Determine eccentricity. Q.4)  If apogee height and perigee height is of 39342 km & 613 km. Determine semi major axis & eccentricity.                                                                                                                 (Src : Satellite Comm. – R P khan) Link To Submit Answers Orbital Mechanics Answer Submission

Quiz Processing Gain & Probability of Error Q.1) If spread spectrum comm. system has information bit duration 4.095 ms and PN chip duration 1 µs. What is Processing Gain & jamming  margin in decibels if  Eb / h= 10. Q.2) Determine Jamming Margin of DSSS/BPSK system with processing gain 30dB and probability of error is 10^-4 in the presence of jamming. Q.3)  If data rate is 6kbps and chip rate is 12kbps, what is Processing gain in decibels. Q.4) If DSSS system transmitting binary data at the rate of 10kbps and has PN sequence generator with 5 shift register stages and clock frequency of 1 MHz. The processing gain of the system is                 a) 47dB                                 b) 30dB                 c) 20dB                 d)50dB To Fill the answers please click on this link https://docs.google.com/forms/d/1Tcz2VXoeIhEymDJMimHtpjj0KvJM0exSWwHHj6995NI/viewform?usp=send_form

  Digital Modulation Techniques digital communication, digital communication assignment,  digital communication assignment no 2,  digital communication assignments,  digital communication all assignments Q.1) Draw & explain euclidian distance and PSD of BPSK, M-ary PSK & 16-ary QAM. Q.2)Explain QPSK. Elaborate your answer with suitable expression, signal space& spectral representation. How QPSK signal is generated and received? What is the difference between OQPSK & QPSK? Q.3) Error occurs in DPSK in pair & in DEPSK error always occurs in single bit. Explain with suitable example. Q.4) Describe the scheme to recover the baseband signal in BPSK. With the help of block diagram and signals marked at input, output of these blocks. Also show that output of receiver is proportional to square root of power within the bit duration. Q.5) Sketch the Power Spectral density of BPSK signal and estimate the bandwidth where input data rate is 10Mb