Enhancing signal space diversity for efficient communication systems

• Main Author: Heng, Ian Boon Chew.
• Other Authors: A S Madhukumar
• Format: Final Year Project
• Language: English
• Published: 2012
• Subjects: DRNTU::Engineering::Electrical and electronic engineering::Wireless communication systems
• Online Access: http://hdl.handle.net/10356/49151
• Institution: Nanyang Technological University

In this report, a study on the improvement in signal transmission is done for the technique known as signal space diversity. This technique is used to combat fading which has always been the fundamental problem in signal communication systems. Rotation of signal constellations paired with component interleaving is known to provide better performance gains over fading channels. This technique is known as signal space diversity. This research is done to study the benefits of signal constellation rotation. It is shown that an optimum choice of rotation angle may lead to a significant gain over classical non-rotated signal constellations when transmitted through a Rayleigh fading channel. A simulation is done and the bit error rate is shown using graphs to study the gain from the above mentioned scheme on different modulation methods, specifically QPSK and 16QAM. Bit error rate graphs are generated to compare between non-rotated and rotated signal constellations through a fading channel. The bit error rate is shown to be improved when utilizing signal space diversity in the graphs.