Analysis of GFDM as a robust 5G communication technique in noisy environment

One of the challenges of modulation techniques used in Fifth-Generation (5G) is their robustness in noisy environment. Conventional Orthogonal Frequency Division Multiplexing (OFDM) cannot be considered as a 5G waveform in its original form because of its certain limitations, such as performance degradation by impulsive noise (IN) and high peak to average power ratio (PAPR). Numerous modulation schemes proposed for 5G communications are able to overcome these drawbacks. Generalised Frequency Division Multiplexing (GFDM) is one of them. This paper analyses the performance of GFDM in presence of Additive White Gaussian Noise (AWGN), IN and Narrow Band Interference (NBI). It is found that GFDM is able to perform better than OFDM and Vector Orthogonal Frequency Division Multiplexing (VOFDM) in presence of noises, which can potentially be present in 5G applications. Simulation results show that GFDM achieve lower PAPR and Symbol Error Rate (SER) and an average of 10.73 dB and 4.73 dB gain in Signal to Noise Ratio (SNR) in presence of IN and combined IN and NBI respectively, as compared to OFDM and VOFDM

Aspect-oriented design model.

Designing crosscutting concerns (aspects) is a challenging task. Since crosscutting concerns were not addressed while developing contemporary software design techniques, so they lack support for accommodating representation of such concerns along with base program. Some design languages like UML have been extended to express aspects and their elements but they do not fully represent aspects. Some lack adequate representation of aspect elements and some lack an efficient and reusable composition technique. In this paper, some of the aspect-oriented design techniques have been critically discussed. A proposed aspect model has been discussed which helps in overcoming the deficiencies in the contemporary aspect-oriented design techniques. This model represents aspects and their elements throughout the software development life cycle

An Investigation into the 1999 Collapse of the Brazilian Real

This study argues that the political considerations were an important factor behind the crisis of the Brazilian real in January 1999. The divided coalition government and a president facing impending elections eschewed the correction of external misalignments and the fiscal austerity at a time when the markets were already excited by the 1997-98 East Asian and 1998 Russian financial crises. The hypothesis is established after confirming the vulnerability of Brazilian economy to currency crisis through Masson's model of multiple equilibrium and then it is tested by running a maximum likelihood logit regression.

Willingness to Pay for Primary Education in Rural Pakistan

Highly subsidised public schools are the principal provider of education in the rural areas of Pakistan. Steady growth of school age population over time coupled with stagnant public funding has put enormous pressure on this system. The alternative of cost recovery through user charges has its own critics. They argue that introduction of tuition fees would substantially reduce the already small representation of low-income households in primary schools due to high price elasticity of their demand for schooling. Moreover, the revenue-generating potential of this policy may also be limited due to same reason. The present study uses a discrete choice random utility model of household utility maximising behaviour to evaluate feasibility and consequences of introducing user fees in primary schools in rural Pakistan, particularly with reference to above criticisms. The demand function for school enrolment derived from this model allows us to test the hypothesis that price elasticity of demand for schooling varies with income. It also provides estimates of the parameters of the utility function needed for measuring parents’ willingness to pay for their childrens’ education if money generated from tuition fees is reinvested in education. The estimated demand function takes into account total price of education, including opportunity cost. Estimation results show that price elasticity of demand for school enrolment is higher for lower-income groups. Hence school enrolment of the poorest children would bear the main brunt of user fees policy. Children’s gender and age, father’s education, presence of T.V. in the household, and community variables like the presence of an elected district council member, electricity, and public transport in the village turn out to be significant influences on the probability of primary school enrolment. Willingness to pay for education is lower for poorer households and can generate revenues to cover only a fraction of the cost of running a school. Hence the need to search for other sources of financing primary education in rural Pakistan.Primary Education, Pakistan

Dynamics of a Charged Particle Around a Slowly Rotating Kerr Black Hole Immersed in Magnetic Field

The dynamics of a charged particle moving around a slowly rotating Kerr black hole in the presence of an external magnetic field is investigated. We are interested to explore the conditions under which the charged particle can escape from the gravitational field of the black hole after colliding with another particle. The escape velocity of the charged particle in the innermost stable circular orbit is calculated. The effective potential and escape velocity of the charged particle with angular momentum in the presence of magnetic field is analyzed. This work serves as an extension of a preceding paper dealing with the Schwarzschild black hole [Zahrani {\it et al}, Phys. Rev. D 87, 084043 (2013)].Comment: 20 pages, 12 figure