NTA-NET (UGC-NET) Computer Science & Applications (87) Current Trends and Technologies-Mobile Computing Study Material (Page 27 of 54)

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Middleware

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Middleware is software entity between user application and operating system or between application and device. In context with mobile different middleware are applicable:

Types of Middleware

Gateways

Gateways act as interface between transport bearers. For e. g. , IVR gateway to interface voice with compu…

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Electromagnetic Waves

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Introduction

In the previous modules we learnt that Electromagnetic waves are used for wireless communications. Electromagnetic waves are sinusoidal periodic waves travelling with speed of light. They are characterized by amplitude, frequency, wavelength, and phase. In communication scenario, E. M. waves are used and discussed in frequency perspective. According to frequency, E. M. waves are divided into seven bands constituting Electromagnetic spectrum. Of these seven bands only four bands namely radio waves, micro waves, Infrared waves, and Visible band are appropriate for communication. Rest all bands namely Ultra violet rays, X-rays and gamma…

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