University of Minnesota

Latest Content From University of Minnesota

Whitepaper: The Recursive NanoBox Processor Grid: A Reliable System Architecture for Unreliable Nanotechnology Devices

by University of MinnesotaJan 01, 2008

The paper published by University of Minnesota describes about advanced molecular nanotechnology devices. These devices are expected to have exceedingly high transient fault rates and large numbers of inherent device defects compared to conventional CMOS devices. In this paper, the authors construct VHDL models of the NanoBox Processor cell ALU. The authors evaluate the effectiveness of the recursive fault masking approach in the presence of random transient errors.

Whitepaper: Regulatory Frameworks And Policy Options For Broadband Growth

by University of MinnesotaJan 01, 2008

Regulation of telecommunications at both state and national levels for a long time set the parameters for rates, investment and the provision of new services. This research paper from University of Minnesota concentrates on two concerns which form the background of this paper. One concern was to understand more about the current regulatory parameters that affect the historically dominant telecommunications service provider in Minnesota, namely Qwest Communications. The second concern was to focus on broadband development and telecommunications investment to identify policy choices in Minnesota that would encourage additional investment in big broadband, especially in non-metro Minnesota.

Whitepaper: MIMO OFDM With ST Coding and Beamforming Adapted to Partial CSI

by University of MinnesotaJan 01, 2008

This research paper presents a study of adaptive Multi-Input Multi-Output (MIMO) Space-Time (ST) OFDM transmissions capable of adapting to partial Channel State Information (CSI) that is available at the transmitter. The proposed transmitter includes an outer stage (adaptive modulation), and an inner stage (adaptive beamforming). Specifically, the inner stage switches between a One-Dimensional (1D) and a Balanced Two-Dimensional (B2D) coder-beamformer, whereas the outer stage carries out joint power and bit loading across OFDM subcarriers.

Whitepaper: Capacity Maximizing MMSE-Optimal Pilots for Wireless OFDM Over Frequency-Selective Block Rayleigh Fading Channels

by University of MinnesotaJan 01, 2008

The location, number, and power of pilot symbols embedded in multi-carrier block transmissions over rapidly fading channels, are important design parameters affecting not only channel estimation performance, but also channel capacity. Considering OFDM systems with decoupled information-bearing symbols from pilot symbols transmitted over wireless frequency-selective Rayleigh fading channels, it is shown that equi-spaced and equi-powered pilot symbols are optimal in terms of minimizing the mean-square channel estimation error. The researchers also designs the number of pilots, and the power distributed between information bearing and pilot symbols, using as criterion a lower bound on the average capacity.