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Homework 2

# Homework 2 - Before anything open Matlab and run demo...

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Before anything, open Matlab and run demo. Select communication blocksets and play with the PLL frequency synthesizer, GMSK and MSK demo systems. Then, build a Simulink model for a GMSK transmitter, simulate it, and compare against the block provided by Matlab. Consider a block diagram of one particular implementation of a GMSK transmitter as illustrated on the next page. The data generator generates a symbol of either 1 or -1 randomly every Td = 1/1MHz. That is each symbol is a square pulse of duration 1 μ s and amplitude of either 1 or -1. The data symbol is sampled every T = 1/100MHz = 10 ns. The sampling clock signal is the 100MHz reference frequency signal generated using a source block. For simplicity, realize the Gaussian filter in discrete-time with a sample period of T = 1/100MHz = 10 ns. A continuous-time Gaussian filter has unit impulse response given by: BT d product specifies the ratio of bandwidth of P(t ) to data rate, the modulation index h is defined as: For GSM, we are required to have: BT d = 0.3, h = 0.5. Evaluate P(t) at an appropriate

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Homework 2 - Before anything open Matlab and run demo...

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