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KTH - Royal Institute of Technology


Latest Content From KTH - Royal Institute of Technology

Whitepaper: Comparison and Cost Analysis of Smart and Opportunistic MIMO OFDM Schemes

by KTH - Royal Institute of TechnologyJan 01, 2008

This paper attempts to compare the system downlink performance of a smart antenna scheme for OFDMA that utilizes channel covariance information with an opportunistic multi-antenna scheme for OFDMA that uses fast limited feedback of the instantaneous channel condition. The schemes are evaluated by means of simulations in a low load scenario and also compared to a simple HSDPA-like scheme. Furthermore, the performance of the schemes is inserted into a cost model that assumes that the receivers are


Whitepaper: Cost Drivers and Deployment Scenarios for Future Broadband Wireless Networks - Key Research Problems and Directions for Research

by KTH - Royal Institute of TechnologyJan 01, 2008

This paper published by KTH - Royal Institute of Technology describes the most prominent problem in providing anywhere, anytime wideband mobile access is the towering infrastructure cost as it is basically proportional to the bandwidth provided. This paper also provides a simple, initial, analysis of the various infrastructure cost factors. This analysis shows that, contrary to what one may expect, the infrastructure cost is not dominated by electronic equipment, but rather by other deployment


Whitepaper: A Concept for Public Access to Privately Operated Cooperating Local Access Points

by KTH - Royal Institute of TechnologyJan 01, 2008

The traditional operators are believed to be unable or unwilling to support some services, mainly for cost reasons for many future mobile communication scenarios. Thus, there will always be gaps in the coverage and capacity of these systems. It describes a non-conventional and low-cost concept for wireless access using privately operated Local Access Points (LAPs) contributing to the public access, thus adding coverage and capacity in e.g. homes, offices and public hotspots. The work has been


Whitepaper: Low Cost Broadband Wireless Access - Key Research Problems and Business Scenarios

by KTH - Royal Institute of TechnologyJan 01, 2008

Today’s mobile communication systems are primarily designed to provide cost effective wide-area coverage for users with moderate bandwidth demands (voice and low rate data). In contrast to the traditional mobile systems, Wireless Local Area Networks (WLAN) is designed for higher bandwidth demands, while the area coverage is significantly limited. This research paper provides a simple, initial, analysis of the various infrastructure cost factors. This analysis shows that, contrary to what


Whitepaper: Institutional And Behavioral Patterns In Advising Small And Medium Sized Firms

by KTH - Royal Institute of TechnologyJan 01, 2008

This paper published by KTH - Royal Institute of Technology describes that although a majority of all Small and Medium sized Enterprises (SMEs) need advice the preparedness to accept advice among SMEs is often low. In the formal institutionalized advice setting the SME owner finds him- or herself in a setting where the dispositions have been set before hand. In this system the main institutional context is that of standardization, formalized interaction and bureaucratic interaction processes.


Whitepaper: Frequency Detector Analysis for a Wireless LAN Frequency Synthesizer

by KTH - Royal Institute of TechnologyJan 01, 2008

This research paper by KTH - Royal Institute of Technology presents an analysis of a frequency detector used in a synthesizer application. The discrimination is analyzed in the presence of timing errors like offsets and jitter. Due to the nature of the detection process, small DC shifts in the output frequency can be identified. Jitter accumulation is greatly reduced since the loop is effectively opened after half a reference period. A linear model for steady state operation of the synthesizer


Whitepaper: Load Balancing in Overlapping Wireless LAN Cells

by KTH - Royal Institute of TechnologyJan 01, 2008

This paper published by KTH - Royal Institute of Technology proposes a load-balancing scheme for overlapping wireless LAN cells. Agents running in each access point broadcast periodically the local load level via the Ethernet backbone and determine whether the access point is overloaded, balanced or under-loaded by comparing it with received reports. The load metric is the access point throughput. Overloaded access points force the handoff of some stations to balance the load. It shows via