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For extra credit only. Quite tricky. This is an extension to assignment 7. Add virtual memory to assignment 7. Everything should run with virtual memory active. The original program should be translated to higher addresses (at or above 0x80000000 like in class), and the programs that execute in response to a “run” command should live […]

Write a BCPL program that reads a sequence of strings typed by the user and creates a linked list containing them all. But there will be some special command words. These should be obeyed but not inserted into the list An input of END will be used to mark the end of the input sequence.

ECE 380 Introduction to Communication Systems Homework Assignment 9 Due: 16:00pm Tuesday, April 4, 2023 Problem 1. A source produces X with the following alphabet A = {a1, a2, a3, a4, a5, a6} and the corre- sponding probabilities are {0.1, 0.2, 0.3, 0.05, 0.15, 0.2}, respectively. (a) Find the entropy of this source. (b) Compare

ECE 380 Introduction to Communication Systems Homework Assignment 3 Due: No need to submit Problem 1. Consider the periodic signal shown in Figure 1. Figure 1: Signal for Problem 1. a) Find the power spectral density of the signal. b) Find the power and the autocorrelation function of the signal. Draw the autocorrelation function (e.g.,

ECE 380 Introduction to Communication Systems Homework Assignment 5 Due: No need to submit Problem 1. The message signal m(t), whose Fourier transform is shown in Figure 1, is transmitted from Point A to Point B. Figure 1: Frequency spectrum for the message in Problem 2. a) If LSSB AM is employed, what is the

ECE 380 Introduction to Communication Systems Homework Assignment 4 Due: 16:00pm Tuesday, March. 7, 2023 Problem 1. In conventional AM, the carrier is c(t) = Ac cos(2πfct) and the message signal is m(t) = sinc(t) + sinc2(t). Let the modulation index be ka = 1 and fc ≫ 1. a) Find the frequency-domain representation and

ECE 380 Introduction to Communication Systems Homework Assignment 8 Due: 16:00pm Tuesday, March. 28, 2023 Problem 1. The value of a message signal varies within [−5, 5]. (a) Design a 5-level uniform quantizer for the message by specifying the quantization regions and quantization levels. (b) The following sequence of message samples is input to the

ECE 380 Introduction to Communication Systems Homework Assignment 2 Due: 16:00pm Tuesday, Feb. 14, 2023 Problem 1. Given g1 (t) ⇌ G1 (f ), g2 (t) ⇌ G2 (f ), please use the definitions of FT and inverse FT to proof the the following FT properties. a) The differentiation property: d g1(t) ⇌ j2πfG1(f). dt

ECE 380 Introduction to Communication Systems Homework Assignment 10 Due: No need to submit Problem 1. In an M-ary ASK digital communication system, the channel has bandwidth 1400 Hz. Select a symbol rate and a signal constellation size to achieve a 9600 bit per second error-free signal transmis- sion. Problem 2. test. (a) Find the

ECE 380 Introduction to Communication Systems Homework Assignment 7 Due: 14:00pm Tuesday, Mar. 21, 2023 Problem 1. Specify the Nyquist rate and the Nyquist interval for the signal g(t) = sinc2(400t). Problem 2. Consider sampling of the sinusoidal wave g(t) = sin(πt). Determine the Fourier transform of the instantaneous sampled signal for the following sampling