Reconfigurable SVD Engine Design for IEEE 802.11n Standard
Date Issued
2009
Date
2009
Author(s)
Jheng, Ting-Jyun
Abstract
With the popular application of wireless local area network (WLAN), there is an increasing demand for bandwidth by the users. Some existing WLAN specifications can not provide adequate transmission rate gradually. The main purpose of IEEE 802.11n WLAN standard is to provide a higher transmission rate to meet present and future bandwidth requirements. The difference between IEEE 802.11n and previous standards is the use of multiple input multi output (MIMO) technique combining with OFDM which causes substantially improvement of transmission rate. In the MIMO wireless communication environment, the signal of each transmit antenna will be transmitted via multiple transmission paths, so the receiving end of each receive antenna will receive the desired signal and other interference signals. Therefore, how to effectively eliminate the interferences between each antenna is a important topic for MIMO system. Information theory has proved that MIMO system has the best performance while applying singular value decomposition (SVD). Using SVD, the interferences between transmit antennas and receive antennas will be eliminated and the MIMO channel is changed into several completely independent paths for transmission. The advantages of using SVD for communication system include the higher throughput, reducing the data error rate, effective against multi-path interference, and effectively solving the bad channel situation. Therefore, the SVD technique in MIMO systems plays an important role, and it is also included in IEEE 802.11n standard.In the thesis, we propose a complete set of SVD algorithm and hardware architecture design, which has the characteristics as follows: 1) 16 mode reconfigurable design for different number of transmit antennas and receive antennas defined in IEEE 802.11n standard, 2) real time and fast convergence operation for all channel matrices of OFDM sub-carrier, 3) early termination scheme for improving system utilization and reducing system latency, and 4) data interleaving scheme for hundred of channel matricesFor the characteristics mentioned above, a reconfiguration SVD engine design for IEEE 802.11n standard is proposed. The design is implemented in a chip using 90nm CMOS process with core area of 2.17 mm2 and 100MHz maximum operational frequency.
Subjects
singular value decomposition (SVD)
multiple-input multi-output (MIMO)
orthogonal frequency division multiplexing (OFDM)
Type
thesis
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