Department of Electrical Engineering (ISY)

MultiBase

This is a project of FP7 ICT of EU working together with Infineon, Ericsson, Lund University, TU-Leuven, and IMEC

Go to the the homepage of multi-base project (here):

Descriptions of sub-projects can be found in the following text.

Our platform is based around controller (called Senior) with both an interface to an on-chip network and an accelerator interface. Long running tasks that can run with little or no interference from the platform controller are offloaded to computation units connected to the OCN. Short running tasks with high computational load can be handled directly by the controller by offloading parts of these tasks to accelerator through the accelerator interface which allows the instruction set of the controller to be enhanced with custom instructions.

Publications are

Rizwan Asghar, Dake Liu Towards Radix-4, Parallel Interleaver Design to Support High-Throughput Turbo Decoding for Re-Configurability 33rd IEEE SARNOFF Symposium, Princeton, New Jersey, USA, April 2010

Rizwan Asghar, Dake Liu, Low complexity multi mode interleaver core for WiMax with support for convolutional interleaving, International Journal of Electronics, Communications and Computer engineering, Vol. 1, No 1, pp 20-29, 2009

Di Wu, Rizwan Asghar, Yulin Huang, Dake Liu, Implementation of a High-Speed Parallel Turbo Decoder for 3GPP LTE Terminals, IEEE 8th International Conference on ASICON, China, October 2009

Rizwan Asghar and Dake Liu, Low Complexity Hardware Interleaver for MIMO-OFDM based Wireless LAN, IEEE International Symposium on Circuits and Systems (ISCAS), Taipei, Taiwan, May 2009

Rizwan Asghar, and Dake Liu, Very Low Cost Configurable Hardware Interleaver for 3G Turbo Decoding, IEEE International Conference on Information and Communication Tech. from Theory to Applications (ICTTA), Damascus, Syria, April 2008

Publications are

Rizwan Asghar,Di Wu,Johan Eilert, Dake Liu, Memory Conflict Analysis and Implementation of a Re-configurable Interleaver Architecture Supporting Unified Parallel Turbo Decoding Springer, Journal of Signal Processing Systems, DOI: 10.1007/s11265-009-0394-8

Rizwan Asghar, Di Wu, Ali Saeed, Yulin Huang, Dake Liu, Implementation of a Radix-4, Parallel Turbo Decoder and Enabling the Multi-Standard Support, Journal of Signal Processing Systems, 2010

Rizwan Asghar, Di Wu, Johan Eilert, Dake Liu, Memory Conflict Analysis and Interleaver Design for Parallel Turbo Decoding Supporting HSPA Evolution, 12th EUROMICRO Conference on Digital System Design, Patras, Greece, August 2009

MIMO systems, different transmission schemes such as Space-Time Coding , Spatial Multiplexing and beamforming are used to enhance the performance of wireless communications by utilizing various dimensions of freedom. In case different transmission schemes are used, the receiver will have different decoder complexity. In the real-world environment, there exist quite a few environmental constraints (such as the channel features, the amount of computing power available etc) which will limit the achievable performance of these schemes. Therefore, the system needs to be flexible enough so that it can be reconfigured in real-time to achieve the optimal trade-off based on the environment (in another word, resources that are available). Programmable Application Specific Processor (ASIP) is one of the most promising solutions that allows SDR to be realized owing to the advance of VLSI technologies. Although the research of MIMO PHY layer algorithms is already well-established with a huge number of papers published, the research on MIMO VLSI implementation is still not thoroughly investigated. Especially the programmability is an essential issue to be addressed since more and more heterogeneous standards are emerging with different forces backing up them.

Di Wu, Johan eilert, Rizwan Asghar, Dake Liu, VLSI Implementation of A Fixed-Complexity Soft-Output MIMO Detector for High-Speed Wireless, EURASIP Journal on Wireless Communications and Networking, 2010

J. Eilert, D. Wu, D. Liu, Efficient Complex Matrix Inversion for MIMO Software Defined Radio, to be presented on IEEE ISCAS, 2007

D. Wu, J. Eilert, D. Liu, D. Wang, N. Al-Dhahir and H. Minn, Fast Complex Valued Matrix Inversion for Multi-User STBC-MIMO Decoding, submitted to IEEE ISVLSI, 2007

J. Eilert, D. Wu, D. Liu, D. Wang, N. Al-Dhahir and H. Minn, Complexity Reduction of Matrix Manipulation for Multi-User STBC-MIMO Decoding, submitted to IEEE Sarnoff Symposium, 2007

D. Wu, J. Eilert, D. Liu, A Programmable Multi-User STBC-MIMO Decoder, submitted to IEEE VTC-fall, 2007

Di Wu, Johan Eilert, Dake Liu, Implementation of a High-Speed MIMO Soft-Output Symbol Detector for Software Defined Radio, Journal of Signal Processing Systems, Springer, New York, 2009

Di Wu, Johan Eilert, Dake Liu, Evaluation of MIMO Symbol Detectors for 3GPP LTE Terminals, 17th European Signal Processing Conference (EUSIPCO), Glasgow, Scotland, August 2009

Channel estimation usually involves intensive computation in the baseband processing of MIMO receivers, thus making it an important issue to be addressed. There have been several categories of channel estimation methods existing. Our research investigates the trade-off of different MIMO channel estimation methods under different channel environment. The purpose is to enable the reconfiguration of the channel estimation method for SDR.

Di Wu, Johan Eilert, Rizwan Asghar, Dake Liu, Anders Nilsson, Eric Tell and Erik Alfredsson System Architecture for 3GPP-LTE Modem using a Programmable Baseband Processor in International Journal of Embedded and Real-Time Communication Systems(IJERTCS), 2010

Johan Eilert, Di Wu, and Dake Liu Efficient Complex Matrix Inversion for MIMO Software Defined Radio International Symposium on Circuits and Systems (ISCAS), New Orleans, LA, USA, May 2007,

Di Wu, Johan Eilert, Rizwan Asghar, Magic Ge, Dake Liu, VLSI Implementation of a Multi-Standard MIMO Symbol Detector for 3GPP LTE and WiMAX, 16th IEEE International Conference on Electronics, Circuits and Systems, Tunisia, December 2009

Di Wu, Johan Eilert, Dake Liu, Anders Nilsson, Eric Tell and Erik Alfredsson, System Architecture for 3GPP LTE Modem using a Programmable Baseband Processor, Proc of International Symposium on System-on-Chip (SoC), Tampere, Finland, October 2009