20072ee132A_1_ca3 - EE132A Spring 2007 Prof John Villasenor...

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EE132A, Spring 2007 Communication Systems Prof. John Villasenor Handout # 15 TA: Choo Chin (Jeffrey) Tan Computer Assignment 3 Assigned: Wednesday, May 16, 2007 Due: Wednesday, May 23, 2007 In this computer assignment, we will learn about Code-Division Multiple Access (CDMA) by using Matlab to look at some examples. The only operations you will need to perform are element-by-element multiplication (.*) and array multiplication (*). What to turn in: Source file for programs (.m files), answers to questions in parts 1 and 2. Introduction : CDMA puts all users desiring access to a trunked resource on the same RF channel at the same time. Cellular CDMA systems overlay their CDMA schemes on the FDMA (Frequency Division Multiple Access) plan. Users of a common frequency channel are separated from each other by superimposing a user-specific high-speed code on the modulation of each user (PN Sequences). Since the separating code has the effect of spreading the occupied bandwidth of each user's transmissions, the system is called a spread spectrum system. We will generate two CDMA channels, and use a correlator (sum the result) to distinguish one channel, or signal, from the other. We will also show that without the correct high-speed code
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This note was uploaded on 11/07/2009 for the course EE 132A taught by Professor Walker during the Spring '08 term at UCLA.

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20072ee132A_1_ca3 - EE132A Spring 2007 Prof John Villasenor...

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