Dennis Chang

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Dennis Chang Free Articles

Introductory guide to Pointers in C

Much of the difficulties in learning C comes from the confusion over the concept of pointers. This article aims to provide a simple guide to understanding the concept of pointers, addresses and variables in C.

GSM System Architecture

GSM stands for the Global System for Mobile Communications. This article aims to provide an introductory guide to the system architecture of GSM.

Introduction to Short Message Service (SMS)

Short Message Service (SMS) is the technology that enables user to send and receive text messages via mobile phones. This article aims to provide an introductory guide to the Short Message Service (SMS) which is part of the GSM specification.

Basic Components of Cellular Systems

This article aims to provide readers an understanding to the architecture of a cellular system. It identifies six basic components that are found in most cellular systems, and offers an insight towards how a cellular system may be designed.

How to send and receive SMS using computer and gsm modem

Short Message Service (SMS) or TXT messaging is a technology that enables users to send and receive text messages via mobile phones. In order to send/receive SMS via computers, we need a gsm modem to connect to the computer, and a relevant software that can communicate with the gsm modem using standard AT commands via serial port. In this article, I will show the most basic AT commands required for sending and receiving of SMS in text mode.