Economic complexity reflects the amount of knowledge that is embedded in the productive structure... more Economic complexity reflects the amount of knowledge that is embedded in the productive structure of an economy. By combining tools from network science and econometrics, a robust and stable relationship between a country's productive structure and its economic growth has been established. Here we report that not only goods but also services are important for predicting the rate at which countries will grow. By adopting a terminology which classifies manufactured goods and delivered services as products, we investigate the influence of services on the country's productive structure. In particular, we provide evidence that complexity indices for services are in general higher than those for goods, which is reflected in a general tendency to rank countries with developed service sector higher than countries with economy centred on manufacturing of goods. By focusing on country dynamics based on experimental data, we investigate the impact of services on the economic complexity of countries measured in the product space (consisting of both goods and services). Importantly, we show that diversification of service exports and its sophistication can provide an additional route for economic growth in both developing and developed countries.
We provide nonasymptotic upper and lower bounds on the sum-rate capacity of Rayleigh block-fading... more We provide nonasymptotic upper and lower bounds on the sum-rate capacity of Rayleigh block-fading multiple-access channels for the setup where a priori channel state information is not available. The upper bound relies on a dual formula for channel capacity and on the assumption that the users can cooperate perfectly. The lower bound is derived assuming a noncooperative scenario, where each user employs unitary space-time modulation (independently from the other users). Numerical results show that the gap between the upper and the lower bound is small already at moderate SNR values. This suggests that the sum-rate capacity gains obtainable through user cooperation are minimal.
Abstract A non-coherent distributed space-time coding scheme for wireless relay networks is prese... more Abstract A non-coherent distributed space-time coding scheme for wireless relay networks is presented. The scheme is the counterpart of non-coherent coding based on Grassmann codes, for cooperative wireless networks with relays. Special classes of Grassmann codes ...
We study the two-user MIMO block fading MAC in the non-coherent setting, where the terminals have... more We study the two-user MIMO block fading MAC in the non-coherent setting, where the terminals have neither transmit nor receive knowledge of the channel realizations. We propose a joint transmission scheme and derive the prelog region achievable by the proposed scheme, by applying a geometric approach. The geometric approach is based on the understanding of the geometric structures which arise as relevant to the problem of communicating non-coherently over the multiple access channel. We show that the proposed scheme achieves the pre-log upper bound for the sum-rate. Comparison with TDMA (both coherent and non-coherent) indicates that in most of the scenarios of practical relevance, the proposed transmission scheme outperforms TDMA.
Economic complexity reflects the amount of knowledge that is embedded in the productive structure... more Economic complexity reflects the amount of knowledge that is embedded in the productive structure of an economy. By combining tools from network science and econometrics, a robust and stable relationship between a country's productive structure and its economic growth has been established. Here we report that not only goods but also services are important for predicting the rate at which countries will grow. By adopting a terminology which classifies manufactured goods and delivered services as products, we investigate the influence of services on the country's productive structure. In particular, we provide evidence that complexity indices for services are in general higher than those for goods, which is reflected in a general tendency to rank countries with developed service sector higher than countries with economy centred on manufacturing of goods. By focusing on country dynamics based on experimental data, we investigate the impact of services on the economic complexity of countries measured in the product space (consisting of both goods and services). Importantly, we show that diversification of service exports and its sophistication can provide an additional route for economic growth in both developing and developed countries.
We provide nonasymptotic upper and lower bounds on the sum-rate capacity of Rayleigh block-fading... more We provide nonasymptotic upper and lower bounds on the sum-rate capacity of Rayleigh block-fading multiple-access channels for the setup where a priori channel state information is not available. The upper bound relies on a dual formula for channel capacity and on the assumption that the users can cooperate perfectly. The lower bound is derived assuming a noncooperative scenario, where each user employs unitary space-time modulation (independently from the other users). Numerical results show that the gap between the upper and the lower bound is small already at moderate SNR values. This suggests that the sum-rate capacity gains obtainable through user cooperation are minimal.
Abstract A non-coherent distributed space-time coding scheme for wireless relay networks is prese... more Abstract A non-coherent distributed space-time coding scheme for wireless relay networks is presented. The scheme is the counterpart of non-coherent coding based on Grassmann codes, for cooperative wireless networks with relays. Special classes of Grassmann codes ...
We study the two-user MIMO block fading MAC in the non-coherent setting, where the terminals have... more We study the two-user MIMO block fading MAC in the non-coherent setting, where the terminals have neither transmit nor receive knowledge of the channel realizations. We propose a joint transmission scheme and derive the prelog region achievable by the proposed scheme, by applying a geometric approach. The geometric approach is based on the understanding of the geometric structures which arise as relevant to the problem of communicating non-coherently over the multiple access channel. We show that the proposed scheme achieves the pre-log upper bound for the sum-rate. Comparison with TDMA (both coherent and non-coherent) indicates that in most of the scenarios of practical relevance, the proposed transmission scheme outperforms TDMA.
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Papers by Zoran Utkovski