Data from 247 global software development teams were used to examine the impact of temporal dispersion and leadership roles on the relationship between nationality diversity and team performance. Nationality diversity was positively related to team performance when project leaders regularly coordinate and monitor team members’ activities, and acted as mentors and facilitator. However, when nati...

Diversity reception is a widely used technique in radio communications to reduce signal fading due to complex propagation environments. Fading is caused by multipath propagation of the radio signal in complex environments, which in practice are either downtown areas in large cities or indoor environments. This presentation is focused on the design problem of an antenna array, which could be use...

The spectral efficiency of a hybrid cellular direct-sequence/frequency hopping code-division multiple-access (DS/FH-CDMA) system operating in a Rayleigh-fading environment is examined. In this work, spectral efficiency is evaluated in terms of the theoretically achievable channel capacity (in the Shannon sense) per user, on the condition that this is estimated in an average sense. The analysis ...

This paper proposes and analyses an efficient wireless telecommunication system with multiple antennas to the emission and reception MIMO (multiple input multiple output) with space diversity in an OFDM (Orthogonal Frequency Di vision Multiplex). The proposed system consists to add modified Alamouti encoder to the system OFDM to improve the performance of the destination by intimately collabora...

We have seen that the communication (even with coding) over a slow fading flat wireless channel has very poor reliability. This is because there is a significant probability that the channel is in outage and this event dominates the total error event (which also include the effect of additive noise). The key to improving the reliability of reception (and this is really required for wireless sys...

Free-space optical communication suffers from irradiance variations caused by random atmospheric temperature fluctuations and pointing error due to jitter and misalignment between transmitter and receiver. In this paper, the simulation results for the average symbol error rate performance of Free Space Optical links over gamma-gamma turbulence fading channels in the presence of pointing error w...

Community structure has been widely identified as a feature of many real-world networks. It has been shown that the antigenic diversity of a pathogen population can be significantly affected by the contact network of its hosts; however, the effects of community structure have not yet been explored. Here, we examine the congruence between patterns of antigenic diversity in pathogen populations i...

In this thesis the possibilities of smart antenna systems in wireless mesh networks are examined. With respect to the individual smart antenna tradeoffs, a routing protocol (Modified HWMP, MHWMP) for IEEE 802.11s mesh networks is presented, that exploits the full range of benefits provided by smart antennas: MHWMP actively switches between the PHY-layer transmission/reception modes (multiplexin...