Electronics and Computer Engineering Master Program

Advanced Wireless Communications (8701611)

Second Semester 2012/2013

Assignment: Computer Simulation of OFDM System

It is required to simulate the performance of OFDM system in Additive White Gaussian Noise (AWGN) channel. Particularly, each student should investigate the effect of various parameters such as SNR, cyclic prefix/guard interval, number of subcarriers M, number of Monte-Carlo simulation loop nloop, type of modulation (qammod, pskmod) with different values of modulation levels q. Given the Matlab code that implements the OFDM system in AWGN channel, it is required to prepare a report that includes the following: 1. Study the effect of the length of the guard interval on the BER performance of the system. Provide one Matlab figure (Fig. 1) showing the BER vs SNR performance when the length of the guard interval is M/2, M/4, M/8, M/16, M=1024, nloop=100000, q=4. Comment on the results. 2. Study the effect of number of subcarriers on the BER performance of the system. Provide one Matlab figure (Fig. 2) showing the BER vs SNR performance when the guard interval is M/4, nloop=100000, q=4, and for different number of subcarriers: M=256, M=512, M=1024, M=2048. Comment on the results. 3. Study the effect of the length of the Monte-Carlo simulation loop on the BER performance of the system. Provide one Matlab figure (Fig. 3) showing the BER vs SNR performance when the guard interval is M/4, M=1024, q=4, and for different values of the loop: nloop=10, nloop=1000, nloop=100000, nloop=10000000. Comment on the results. 4. Study the effect of the Quadrature Amplitude Modulation (QAM) with different modulation levels on the BER performance of the system. Provide one Matlab figure (Fig. 4) showing the BER vs SNR performance when the guard interval is M/4, M=1024, nloop=100000, and for different values of modulation levels: “q=4 QAM”,...

...International Journal of Engineering Research and Applications (IJERA) ISSN: 2248-9622 www.ijera.com Vol. 3, Issue 2, March -April 2013, pp.401-409
Twisted Amplitude PhaseShiftKeying
ABSTRACT
Several modulation techniques are defined in digital modulation, Here we are discussing about in four modulation techniques,8-PSK,8-TAPSK,16TAPSK and 16-QAM. In the paper we derive minimum non coherent distance(dnc)of block coded TAPSK and compare it with...

...
THE GUARD
For a brief moment, while waiting for my instructor to check the plotter, I glanced out through the window of the gunnery storeroom at the surrounding Ambala countryside. It lay green and crisp beneath a crackling December sun. Winter was already tightening its cold embrace over North India.
Behind me lay the boundary fence of the command Air Force base, the largest air force station north of Delhi. And beyond the Air Force station was the Grand Trunk Road,...

...analysis of multiplication of sine and cosine signals. A SPICE simulation is used to illustrate QPSK modulation of a 1MHz sine wave. A phasor diagram shows the impact of poor synchronization with the local oscillator. Digital processing is used to remove phase and frequency errors. Since the early days of electronics, as advances in technology were taking place, the boundaries of both local and global communication began eroding, resulting in a world that is smaller and hence...

...bound. Heckscher, arguing along these lines, describes them as cleaned up bureaucracies,[8] rather than a fundamental shift away from bureaucracy. Gideon Kunda, in his classic study of culture management at 'Tech' argued that 'the essence of bureaucratic control - the formalisation, codification and enforcement of rules and regulations - does not change in principle.....it shifts focus from organizational structure to the organization's culture'.
Another smaller...

...confidence interval for the population mean.
a) The estimated population mean = 3.01 pounds
b) Here it is given that, xbar = 3.01, s = 0.03, n = 36.
The Standard error of the mean, SE = s/Sqrt(n) = 0.03/Sqrt(36) = 0.005
The z- score for 95% confidence is z = 1.96
A 95 percent confidence interval for the population mean is given by
(xbar – z*SE, xbar + z*SE)
= (3.01 – 1.96*0.005, 3.01 + 1.96*0.005)
= (3.01 – 0.0098, 3.01 +0.0098)
= (3.0002, 3.0198)...

...20 to 34 years of age who have
hypertension.
(b) Construct a 95% confidence interval for the proportion of adult males 20 to 34 who have
hypertension. Interpret the confidence interval.
You wish to conduct your own study to determine the proportion of adult males 20 to 34 years
old who have hypertension.
(c) What sample size would be needed for the estimate to be within 3 percentage points (interval
length is 0.06) with 95%...