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
There are three primary methodologies employed to determine real estate value in the appraisal industry： the cost approach, the sales approach and the income approach. The definition of market value is defined as： ...There are three primary methodologies employed to determine real estate value in the appraisal industry： the cost approach, the sales approach and the income approach. The definition of market value is defined as： ＂a type of value, stated as an opinion that includes a set of assumptions concerning the market＂. Unfortunately, untrained and unlicensed appraisers provided opinions using primarily the sales approach or market data approach and virtually ignored the other two methodologies. The ensuing game of ＂Can You Top This＂ resulted in creating an out-of-control real estate market driven by unregulated fiduciaries as appraisers.展开更多
This essay suggests that in 1962-1963, before Birmingham and the March on Washington, a coalition of Black and White civil rights activists, labor, and religious leaders were in the vanguard of the struggle both on th...This essay suggests that in 1962-1963, before Birmingham and the March on Washington, a coalition of Black and White civil rights activists, labor, and religious leaders were in the vanguard of the struggle both on the Pacific Slope and in the nation. Berkeley＇s battle for fair housing represented an important phase of the civil rights struggle on the west coast and in cities where racial segregation was not based on law, but part of a conspiracy, silent but quite effective, among realtors, mortgage lenders, and renters, against Blacks and other minorities. Encouraged by state antidiscrimination legislation, Berkeley activists embarked upon a fair housing campaign based on surveys of the problem, efforts to enact legislation, and direct action. The irrationality of racists who defended their right to discriminate was one of the most singular aspects of the fair housing struggle. Though they lost at the local level, the coalition of new political forces succeeded a few months later at the state level and represented an effective force in liberal politics in the city for years to come. Because of the stiff opposition and the limits of reformers＇ liberal fair housing regulations, however, working class and poor African Americans still faced severe housing problems.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There are three primary methodologies employed to determine real estate value in the appraisal industry： the cost approach, the sales approach and the income approach. The definition of market value is defined as： ＂a type of value, stated as an opinion that includes a set of assumptions concerning the market＂. Unfortunately, untrained and unlicensed appraisers provided opinions using primarily the sales approach or market data approach and virtually ignored the other two methodologies. The ensuing game of ＂Can You Top This＂ resulted in creating an out-of-control real estate market driven by unregulated fiduciaries as appraisers.
文摘This essay suggests that in 1962-1963, before Birmingham and the March on Washington, a coalition of Black and White civil rights activists, labor, and religious leaders were in the vanguard of the struggle both on the Pacific Slope and in the nation. Berkeley＇s battle for fair housing represented an important phase of the civil rights struggle on the west coast and in cities where racial segregation was not based on law, but part of a conspiracy, silent but quite effective, among realtors, mortgage lenders, and renters, against Blacks and other minorities. Encouraged by state antidiscrimination legislation, Berkeley activists embarked upon a fair housing campaign based on surveys of the problem, efforts to enact legislation, and direct action. The irrationality of racists who defended their right to discriminate was one of the most singular aspects of the fair housing struggle. Though they lost at the local level, the coalition of new political forces succeeded a few months later at the state level and represented an effective force in liberal politics in the city for years to come. Because of the stiff opposition and the limits of reformers＇ liberal fair housing regulations, however, working class and poor African Americans still faced severe housing problems.
