Baseband design and implementation for micro/pico base stations （mBS） in 5G ultra-dense network （UDN） is studied. Low cost is an essential requirement for mBS baseband in UDN. Digital baseband cost of ASIC/ASIP （...Baseband design and implementation for micro/pico base stations （mBS） in 5G ultra-dense network （UDN） is studied. Low cost is an essential requirement for mBS baseband in UDN. Digital baseband cost of ASIC/ASIP （Application Specific Integrated Circuit / Instruction-set processor） is of the most uncertainty in roBS system. However. the actual costs and hardware feasibility of the baseband are yet unknown to network deployers and researchers. In this paper, we studied the baseband hardware system design and implementation for low-cost roBS. We analyzed popular baseband algorithms and architectures for both full-digital and hybrid beamforming （BF） for UDN. We then proposed feasible chip-level solutions for the baseband with up to 128-antenna BS system, and estimated their implementation cost. Results show that among lull-digital BF algorithms, zero-forcing is a choice of high performance and low cost; for hybrid BF, 4×32 architecture （32 RF chains） provides good reduction in baseband cost with acceptable performance loss, thus it can be a preferable solution under low cost consider- ation. The proposed system planning method can also be used for the design of other related systems.展开更多
This study extends research on the social performance of microfinance institutions. The research methodology is based on Grameen Progress out of Poverty IndexTM （PPITM） for Cambodia applied to a sample of borrowers ...This study extends research on the social performance of microfinance institutions. The research methodology is based on Grameen Progress out of Poverty IndexTM （PPITM） for Cambodia applied to a sample of borrowers randomly extracted from a Cambodian microfinance institution＇s loan portfolio. Dataset has been directly collected through in-house interviews. Main questions discussed here are： （1） Is microcredit targeted to poor people？ （2） Has the poverty rate of the sample changed in last six months？ and （3） What percentage of male vs. female clients is poor？ We found an average poverty likelihood of about 8.1%, estimated at the day of the interview, steady over a period of six months and not statistically different between male and female borrowers. This evidence might be related to business geographical location or targeting. Actually, PPI too much relies on asset ownership rather than on cash flows and saving capacity. Despite the general wisdom microcredit is targeted to the ＂poorest among the poor people＂, this is utterly consistent with a sound and safe （micro）banking activity, aimed at sustainable results. Here comes a call for a triple bottom line performance evaluation on microflnance institutions： economic, social and environmental effects of their activities展开更多
Against the background that the central government is strengthening macro control and tightening credit scale of real estate businesses, financing capacity becomes the determinant for a real estate enterprise＇s devel...Against the background that the central government is strengthening macro control and tightening credit scale of real estate businesses, financing capacity becomes the determinant for a real estate enterprise＇s development. Domestic enterprises have many ways of financing, and this paper describes ten common models, simply analyses the advantages and disadvantages of each model, while explains and recommends three financing models with practical examples： individual entrusted loan, trust financing and assets securitization.展开更多
基金supporting from National High Technical Research and Development Program of China(863 program)2014AA01A705 is sincerely acknowledged by authors
文摘Baseband design and implementation for micro/pico base stations （mBS） in 5G ultra-dense network （UDN） is studied. Low cost is an essential requirement for mBS baseband in UDN. Digital baseband cost of ASIC/ASIP （Application Specific Integrated Circuit / Instruction-set processor） is of the most uncertainty in roBS system. However. the actual costs and hardware feasibility of the baseband are yet unknown to network deployers and researchers. In this paper, we studied the baseband hardware system design and implementation for low-cost roBS. We analyzed popular baseband algorithms and architectures for both full-digital and hybrid beamforming （BF） for UDN. We then proposed feasible chip-level solutions for the baseband with up to 128-antenna BS system, and estimated their implementation cost. Results show that among lull-digital BF algorithms, zero-forcing is a choice of high performance and low cost; for hybrid BF, 4×32 architecture （32 RF chains） provides good reduction in baseband cost with acceptable performance loss, thus it can be a preferable solution under low cost consider- ation. The proposed system planning method can also be used for the design of other related systems.
文摘This study extends research on the social performance of microfinance institutions. The research methodology is based on Grameen Progress out of Poverty IndexTM （PPITM） for Cambodia applied to a sample of borrowers randomly extracted from a Cambodian microfinance institution＇s loan portfolio. Dataset has been directly collected through in-house interviews. Main questions discussed here are： （1） Is microcredit targeted to poor people？ （2） Has the poverty rate of the sample changed in last six months？ and （3） What percentage of male vs. female clients is poor？ We found an average poverty likelihood of about 8.1%, estimated at the day of the interview, steady over a period of six months and not statistically different between male and female borrowers. This evidence might be related to business geographical location or targeting. Actually, PPI too much relies on asset ownership rather than on cash flows and saving capacity. Despite the general wisdom microcredit is targeted to the ＂poorest among the poor people＂, this is utterly consistent with a sound and safe （micro）banking activity, aimed at sustainable results. Here comes a call for a triple bottom line performance evaluation on microflnance institutions： economic, social and environmental effects of their activities
文摘Against the background that the central government is strengthening macro control and tightening credit scale of real estate businesses, financing capacity becomes the determinant for a real estate enterprise＇s development. Domestic enterprises have many ways of financing, and this paper describes ten common models, simply analyses the advantages and disadvantages of each model, while explains and recommends three financing models with practical examples： individual entrusted loan, trust financing and assets securitization.
