In this paper, a new subcarrier allocation algorithm is proposed for an OFDMA relay network with multicells. In the proposed algorithm, subcarriers are allocated to users and relays so as to maximize the overall sum of the achievable rate under fairness constraints. Fairness constraints are imposed on the minimum rate requirement of users and the maximum power of base stations and relays. Simul...

Different types of traffic with different Quality of Service requirements are competing for its resources. The 3G LTE accommodates smart selections of users and transmission of data through packets. In this paper, packet scheduler for LTE downlink is described and comparison of four basic packet scheduling algorithm is explained. It unties obscurity of dividing the packet scheduler into a time ...

Estimation of the channel impulse responses of multiple cochannel users is a key requirement of all multiuser detection and interference cancellation techniques, though little attention has been paid to subject in the context of TDMA systems. This paper addresses a pilotbased technique for multiuser channel estimation in a TDMA system, and makes several new contributions: it allows for time var...

This paper investigates issues on culture and websites design for e-commerce, and also relates them to advanced requirements engineering practices. E-commerce parishioners and users have different expects and preferences from a web site. Finding information on a web site is an important issue. We observe that cultural concerns may crosscut several base functionalities of a system, constraining ...

In this paper we present User Participatory Sketching as a complementary approach to user requirements gathering methods. We apply the approach in an empirical study and investigate its potential benefits early in interaction design processes. The findings from a case study suggest the User Participatory Sketching approach can complement conventional user requirement gathering techniques in the...

This paper proposes User Participatory Sketching as a complementary approach to user requirements gathering methods, applies the approach in an empirical study and investigates its potential benefits in the early interaction design stage. The findings from the case study suggest the proposed “User Participatory Sketching” can complement conventional user requirement gathering techniques in the ...

Human factors have been increasingly recognized as one of the major driving forces of requirement changes. We believe that the requirements elicitation (RE) process should largely embrace human-centered perspectives, and this work focuses on changing human intentions and desires over time. To support software evolution due to requirement changes, Situ framework has been proposed to model and de...

Artificial lighting is responsible for a large portion of total energy consumption and has great potential for energy saving. This paper designs an LED light control algorithm based on users’ localization using multiple battery-less binary human detection sensors. The proposed lighting control system focuses on reducing office lighting energy consumption and satisfying users’ illumination requi...

It is an inherently challenging task to provide Quality of Service(QoS) to real time multimedia users in a cellular network owing to their mobility induced uncertainty. We propose an implicit resource allocation strategy and justify the need of such a strategy toward an effective solution to QoS provisioning. The reservation scheme presented here based on this proposed strategy aims at meeting ...

One of the most common situations in photo editing is that users want some specific effects but don’t know how to achieve them. Nevertheless, they have an image in their mind about how the photo should be, which is derived from a better photo on similar subjects, or from their imagination. With this user motivation in mind, this thesis proposes a method for altering a photo’s color based on the...