一种通用数字中频正交扩频调制器的实现

提出了一种适应于宽带扩频通信系统的数字中频调制的实现方案,它基于正交调制、DDS、数字上变频和数字内插等技术,采用通用硬件平台,可以生成多种中频调制信号,可广泛用于数字化扩频通信电台、宽带CDMA、软件无线电、遥控遥测等通信系统中。     

数字中频接收机的设计与实现

数字中频接收机(DIFR)是对中频信号直接采样，其信道化功能由数字正交下变频器和数字滤波器来实现。因此，DIFR适用于接收和处理多载波、多模式信号，可解决很多种信号之间的互通互连问题。本文基于DIFR对动态范围、带宽、自动增益控制和高速信号采集等技术需求，优化设计了一种大动态宽带DIFR，给出了该系统的实现方案、各部分的参数分配及系统设计指标；给出了一种新型的数字自动增益控制(DAGC)实现电路，并提出了其控制算法。     

Call Center Employees’ Intent to Quit: Examination of Job Engagement and Role Clarity

Call centers have become a valuable resource for hotels in managing customer experiences and relationships, yet they have also developed a reputation for being a stressful job which has made it a significant challenge to retain employees. Given high turnover rates among call center employees, it is important for hospitality firms to understand the factors influencing their intentions to quit. This study focuses on job engagement and role clarity to examine hotel call center employees’ intent to quit. The survey results of call center employees at a large resort hotel suggest that job engagement significantly influences the hotel call center employees’ intent to quit after accounting for job satisfaction and organizational support. Role clarity, however, is not related to intent to quit. Managerial implications and recommendations for increasing employee job engagement are discussed.     

Reason's shadow: Notes on the psychodynamics of obstruction

The remarks that follow are made with regard to the behavior of leaders whose self-image is threatened by a variety of conditions comprising the world problematique. Of all those conditions, surely those associated with violence and warfare are the most threatening. I would speculate, therefore, that what I've written here is especially pertinent for deliberations on how to encourage peace and disarmament.While these remarks are focused on the behavior of leaders—especially those in government—they can hold, too, for those in the public who identify with those leaders…itself another psychodynamic process. Of course, the public's contexts differ so the degree of threat and response will differ, too. This is a matter for further attention.Moreover, self-images are usually rich in content and while some aspects are threatened, others may not be or, indeed, may be attracted by new rational ideas. The resultant struggle within the psyche complicates the overt expression of these unconscious conflicts.But these dynamics mirror those comprising the problematique, especially its expression around issues of war and peace. Therefore, psychodynamic matters deserve as much attention and utilization as we now give to conventional, indeed, often ritual means, masquerading as rationality, for dealing with violence and armaments.     

Product life cycle research: A literature review

The purposes of this paper are threefold: to review the scope of product life cycle (PLC) research; to pinpoint areas requiring further investigation; and to provide guidelines for future researchers. Because of the paucity of empirical evidence, only tentative conclusions are advanced. For example, the most common PLC pattern is the classical, bell-shaped curve, but it is not the sole shape. The application of various forecasting techniques across the PLC have met with merely moderate success. Very little research has been conducted either on how different characteristics of the firm influence the PLC or on the actual use of various PLC-strategy theories by business planners. Finally, investigators have focused almost exclusively on validating the existence of the PLC concept among nondurable consumer goods. Industrial items, as well as major product changes, have been nearly ignored. The main conclusion is that additional research-more diversified and extensive in nature-is needed on many PLC topics.     

Club convergence and drivers of digitalization across Indian states

Disparity in the level of digitalization is a crucial driver of economic inequality in an economy. Although a pocket of its population is still bereft of the benefits of digitalization, India currently has the second highest number of internet subscribers in the world despite the nation's late adoption of digital technology. An accurate assessment of the current state of digitalization in the country is required for devising effective initiatives towards building a Digital India and bridging the nation's internal digital divide. Considering 17 major Indian states and 21 variables for 10 years, we constructed a composite index of digitalization with the help of Principal Component Method (PCM). This paper identifies factors responsible for the digitalization divide across states. In the second part of the analysis, the study confirms, with the help of club convergence test, the absence of overall convergence towards digitalization and the existence of the non-convergent group. This paper also shows that the non-convergent group of states are at the bottom of the ranking table which indicates the need for greater attention to initiatives to bridge the digital divide.     

The stalemate of cable digital switchover: A study of competition effects and deregulation

This paper addresses the phenomenon of delayed cable digitization in Taiwan and reports the results of a longitudinal analysis, determining that (1) inter-platform competition, primarily from internet protocol television (IPTV), generates a strong and positive impact on the digitization of cable service after it acquires numerous customers; (2) the installed cable base induces economies of scale that increase its digital penetration; (3) the overbuild of the equivalent-size rivalry can increase digital adoption, whereas unequal-sized competition might reversely decrease it; and (4) the monthly flat fee charged to customers does not influence digital adoption. In addition, this paper presents a discussion on the policy instruments derived from econometric results. Although repealing the horizontal integration cap in the cable TV industry could generate economies of scale, doing so may encourage monopolization over several franchises. The efficacy of intra-platform competition is reserved only for certain cases. Combining the results of these analyses reveals that inter-platform competition most effectively stimulates cable operators’ digital conversion. Hence, regulators should create a level playing field among various TV platforms, such as equal programming access and open standards, to ensure a high degree of cable digitization     

Willingness to pay and pricing for broadband across the rural/urban divide in Canada

Efforts to close the rural/urban digital divide in Canada have reached new heights in the wake of the ongoing COVID-19 pandemic and “stay-at-home” policies. Yet the extent to which the rural/urban digital divide extends to pricing and demand for broadband services is not well understood. Using a dataset of more than 4700 residential survey responses from southern Ontario, Canada, we assess the disparity in pricing and willingness to pay for broadband across rural and urban households. Our results suggest that rural users face higher installation and monthly fees while receiving a significantly inferior quality of service than their urban counterparts. Demand among rural users for improved broadband access is also higher than for urban users. These results may strengthen the business case for expanding broadband services into rural areas and/or supporting justification for public subsidization. Our analysis also suggests higher economic net benefits from prioritizing majority access at current federal service objectives rather than investing in a small number of users to receive higher quality broadband.     

The tribal digital divide: Extent and Explanations

This paper documents home Internet access, types of Internet access, connection speeds, and prices for basic home Internet in tribal areas of the United States. We find that the share of households with Internet access is 21 percentage points lower in tribal areas than in neighboring non-tribal areas. When compared to these non-tribal areas, download speeds, whether measured using fixed or mobile broadband networks, are approximately 75% slower in tribal areas, while the lowest price for basic Internet services in tribal areas is 11% higher. Regression techniques reveal that traditional cost factors such as terrain and population density fully explain the price gap but account for only a fraction of the tribal differences in Internet access and connection speeds. Income differences are strong predictors of Internet access but do not affect connection speeds. A sizable amount of the variation in the access and home connection gap between tribal and non-tribal is left unexplained. We conclude with a discussion of how federal broadband programs have penetrated Indian Country, how tribal-specific factors are related to the variation in Internet access within Indian Country, and the potential policy implications of our findings.