JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD MCA V MOBILE COMPUTING Previous Question Paper (January - 2018 - R15)

Mobile computing refers to the ability to use computing technology while in motion, focusing on the portability of devices and the continuity of applications across different network environments. In contrast, wireless computing refers specifically to the method of data transmission between devices using radio waves or infrared signals instead of physical cables. While wireless computing is a foundational technology that enables mobile computing, mobile computing encompasses broader aspects such as device mobility, session management, and adaptive software, whereas wireless computing is limited to the physical layer connectivity.

Code Division Multiple Access (CDMA) is a digital cellular technology that uses spread-spectrum techniques to allow multiple users to share the same frequency band simultaneously. Unlike other methods that divide channels by time or frequency, CDMA assigns a unique digital code to each user's signal. This allows all users to transmit across the entire available bandwidth at once, with the receiver using the specific code to extract the intended signal from the background noise. Key advantages include increased capacity, improved security due to the coded nature of signals, and better resistance to interference.