Suppose two users in a Direct Sequence-CDMA system have signatures (that is, sequences of chips) given by (1 -1 1-1) and (1 1 -1 -1), respectively. (a) Evaluate the correlation between the two signatures. (b) Sketch the baseband signals for the two users when user 1 sends the bits 011, and user 2 sends the bits 101. Add the signals for the first bit only, and show that the output of the correlator for user 1 is -4, and the output of the correlator for user 2 is 4. Note that if the output of the correlator is negative, then the detected bit is a 0, and if the output is positive, the detected bit is a 1.

Suppose two users in a Direct Sequence-CDMA system have signatures (that is, sequences of chips) given by (1 -1 1-1) and (1 1 -1 -1), respectively. (a) Evaluate the correlation between the two signatures. (b) Sketch the baseband signals for the two users when user 1 sends the bits 011, and user 2 sends the bits 101. Add the signals for the first bit only, and show that the output of the correlator for user 1 is -4, and the output of the correlator for user 2 is 4. Note that if the output of the correlator is negative, then the detected bit is a 0, and if the output is positive, the detected bit is a 1.

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Network transmission cabling

A network is a collection of devices connected by communication links. A device can be a computer or any instrument capable of sending and receiving data or information formed by other nodes toward the network. A channel that connects people or things is known as a network. It sends the data from one place to another. It is the basic concept of a computer, network, and data communications.

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4. Suppose two users in a Direct Sequence-CDMA system have signatures (that is, sequences of chips)
given by (1 -1 1-1) and (1 1 -1 -1), respectively.
(a) Evaluate the correlation between the two signatures.
(b) Sketch the baseband signals for the two users when user 1 sends the bits 011, and user 2 sends the
bits 101. Add the signals for the first bit only, and show that the output of the correlator for user 1 is
-4, and the output of the correlator for user 2 is 4. Note that if the output of the correlator is negative,
then the detected bit is a 0, and if the output is positive, the detected bit is a 1.

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