Two Novel Space-Time Coding Techniques Designed for UWB MISO Systems Based on Wavelet Transform

Area of Science:

• Electrical Engineering
• Signal Processing
• Wireless Communications

Background:

• Ultra-Wideband (UWB) systems offer high data rates but face challenges in spectral efficiency and multipath interference.
• Conventional space-time coding multi-input single-output (STC MISO) schemes are used to improve reliability but can be limited in data rate enhancement.
• Novel approaches are needed to increase data rates in UWB systems while maintaining performance.

Purpose of the Study:

• To introduce two new wavelet space-time coding (WSTC) schemes specifically designed for UWB systems.
• To enhance data transmission rates by a factor of four compared to existing STC MISO techniques.
• To improve system performance and receiver complexity through innovative spatial and wavelet domain multiplexing.

Main Methods:

• Development of two WSTC schemes utilizing spatial and wavelet domain multiplexing.
• Transmission of four symbols on a single UWB pulse using a selected mother wavelet correlated with the pulse shape.
• Implementation of Rake receivers to effectively manage dense multipath channel components.

Main Results:

• The proposed WSTC schemes achieve a fourfold increase in data rate compared to conventional STC MISO.
• The second WSTC scheme demonstrates superior performance and reduced receiver complexity due to inherent spatial diversity.
• Simulation results validate the enhanced performance and data rate capabilities of the WSTC schemes.

Conclusions:

• Wavelet space-time coding (WSTC) offers a significant advancement for UWB communication systems.
• The developed WSTC schemes provide a viable solution for increasing data rates and improving performance in UWB environments.
• These novel techniques represent a promising direction for future high-speed wireless communication.