Forskning

Ultra-Wide Band High-Speed Short-Range Wireless System (Digital Baseband)

• Low-power technology for high-speed (1G sample/second) fast-Fourier-transformation (FFT)/inverse-FFT processor design
• Tackle analog front-end non-ideal effects (e.g. carrier-frequency offset, I/Q imbalance, sampling-frequency offset) using digital-signal-processing method
• Multi-standard (i.e. ISO-26907/C-UWB) ultra-wide band digital baseband implementation on field-programmable-gate-array 

 Digital Signal Processing for Multiple-Input Multiple-Output (MIMO) System

• Very high speed, configurable MIMO signal detector supporting 2×2/3×3/4×4 antenna configuration and QPSK/16-QAM/64-QAM modulation  
• Multi-mode (spatial-multiplexing/spatial-diversity/space-division-multiple-access) MIMO signal detector for 3GPP Long-Term-Evolution-Advanced (LTE-A) down-link
• Complexity-performance analysis for iterative signal detector and ECC decoder (e.g. LDPC/Turbo-code) system 

Energy-Efficient Digital Baseband Using Link-Adaptive Application-Driven Signal Processing

• Energy efficiency is a growing concern in the design of next-generation mobile terminals since the amount of energy needed is increasing dramatically with the explosive growth in service requirements, while the development of battery technology is much slower. Mobile devices experience highly dynamic working conditions, where both channel environment and user requirements vary within huge dynamic ranges. Thereby, the traditional static implementation targeting the worst-case condition is highly energy-inefficient in most cases.
• The research project investigates techniques to reduce energy consumption in mobile devices using link-adaptive application-driven (LAAD) implementations, which are reconfigured at run-time to satisfy instantaneous demands with minimum energy consumption. As a flexible but still high performance platform, a coarse-grained heterogeneous processor array will be developed for efficient realization of LAAD by providing multiple configurations on a single device. To properly evaluate the techniques, we will focus on the application of the recent LTE-Advanced standard (3GPP release 10).