Adaptive power and rate control for CDMA mobile systems

Dissertant

Mahmud, Khalid Abd al-Razzaq

University

University of Technology

Faculty

-

Department

Department of Electrical Engineering

University Country

Iraq

Degree

Master

Degree Date

2004

English Abstract

Using as low transmitted energy as possible is the primary goal for the developers of mobile cellular systems.

This is important for increased batterv life and reduction of interference.

In an unbalanced and unmanaged system with an inadequate power control, performance degradation and reduction channel capacity are vastly evident.

The near-far problem is one of the most important reasons why adaptive control is urgently needed in CDMA systems.

In this work different simulators that simulate the IS-95 cellular CDMA system are designed and implemented by software, these are mobile station, base station, mobile channel forward link, reverse link, and others.

The designed! simulators- have :he ability to simulate the various time- varying operating conditions associated with wireless mobile- transmission.

Adaptive power control, adaptive data rate, and Adaptive Power and Rate Approach ( APRA • are proposed in this work to compact the near-:ar problem and reduce interference.

The proposed approaches depend on idea, of dividing the operation area of mobile user into four regions according lo.

signal strength.

Moreover, Bit Error Rate (BER) performance is to be tested continuously, and the transmitted signal power and data rate are adaptively changed, according, to the proposed' approaches, keeping BER within some threshold values, for different power regions.

Various performance evaluation tests are performed on the designed network, at different regions, and for many distinct operation conditions like multipath environment, fading, and Doppler effects.

However, the obtained results showed the proposed approaches; to enhance system performance and control its BER degradation.

Main Subjects

Telecommunications Engineering

Topics

• Radio

• APA
• MLA
• AMA

Language

English

Data Type

Arab Theses

Record ID

BIM-305678