BT0086, Mobile Computing

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[FALL  2015  ] ASSIGNMENT

PROGRAM	BSc IT
SEMESTER	FIFTH
SUBJECT CODE & NAME	BT0086, Mobile Computing
CREDITS	4
BK ID	B2067
MAX. MARKS	60

Note: Answer all questions.

Q1.Write short notes on:

(i) Amplitude Shift Keying (ASK)

Answer: Amplitude-shift keying (ASK) is a form of amplitude modulation that represents digital data as variations in the amplitude of a carrier wave. In an ASK system, the binary symbol 1 is represented by transmitting a fixed-amplitude carrier wave and fixed frequency for a bit duration of T seconds. If the signal value is 1 then the carrier signal will be transmitted; otherwise, a signal value of 0 will be transmitted.

Any digital modulation scheme uses a finite number of distinct signals to represent digital data. ASK uses a finite number of amplitudes, each

(ii) Frequency Shift Keying (FSK) and

Answer: Frequency-shift keying (FSK) is a frequency modulation scheme in which digital information is transmitted through discrete frequency changes of a carrier signal.[1] The technology is used for communication systems such as amateur radio, caller ID and emergency broadcasts. The simplest FSK is binary FSK (BFSK). BFSK uses a pair of discrete frequencies to transmit binary (0s and 1s) information.[2] With this scheme, the "1" is called the mark frequency and the "0" is called the space frequency. The time domain of an FSK

(iii) Phase Shift Keying (PSK).

Answer: Phase-shift keying (PSK) is a digital modulation scheme that conveys data by changing (modulating) the phase of a reference signal (the carrier wave). It is widely used for wireless LANs, RFID and Bluetooth communication.

Any digital modulation scheme uses a finite number of distinct signals to represent digital data. PSK uses a finite

Q. 2. What is near and far effect problem in wireless communication? Explain in brief.

Answer: The near-far problem or hearability problem is a situation that is common in wireless communication systems, in particular, CDMA. In some signal jamming techniques, the near-far problem is exploited to disrupt communications. The near-far problem is a condition in which a receiver captures a strong signal and thereby makes it impossible for the receiver to detect a weaker signal. The near-far problem is particularly difficult in CDMA systems, where transmitters share transmission frequencies and transmission time. By contrast, FDMA and TDMA systems are less vulnerable.

Q. 3. Explain about the Operation Sub System (OSS) of GSM system.

Answer:The operations and maintenance center (OMC) is connected to all equipment in the switching system and to the BSC. The implementation of OMC is called the operation and support system (OSS).

Here are some of the OMC functions:

·         Administration and commercial operation (subscription, end terminals, charging and statistics).

Q. 4. Explain Hard handover and Soft handover in UMTS.

Answer:The Universal Mobile Telecommunications System (UMTS) is a third generation mobile cellular system for networks based on the GSM standard. Developed and maintained by the 3GPP (3rd Generation Partnership Project), UMTS is a component of the International Telecommunications Union IMT-2000 standard set and compares with the CDMA2000 standard set for networks based on the competing cdmaOne technology. UMTS uses wideband code division multiple access (W-CDMA) radio access technology to offer greater spectral efficiency and bandwidth to mobile network operators.

Q. 5.List the advantages and disadvantages of Infra-red technology.

Answer:As next-generation electronic information systems evolve, it is critical that all people have access to the information available via these systems. Examples of developing and future information systems include interactive television, touchscreen-based information kiosks, and advanced Internet programs. Infrared technology, increasingly present in mainstream applications, holds great potential for enabling people with a variety of disabilities to access a growing list of information resources. Already commonly

Q6.Draw the WiMAX network architecture and describe it in brief.

Answer : The WiMAX network architecture defines the system after the air interface to enable a full end to end network to be achieved.

In order that elements of network equipment can be used from different suppliers, it is necessary to define the WiMAX network architecture that is common to all WiMAX networks. In this way economies of scale can be gained along with robust networks that are able to perform reliably under all conditions.

WiMAX network basics

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