Bhuvan Unhelkar

Separation performance of ICA algorithms in communication systems

In commercial cellular networks, like the systems based on direct sequence code division multiple access (DS-CDMA), many types of interferences can appear, starting from multi-user interference inside each sector in a cell to inter-operator interference. Also unintentional jamming can be present due to co-existing systems at the same band, whereas intentional jamming arises mainly in military applications. Independent Component Analysis (ICA) use as an advanced pre-processing tool for blind suppression of interfering signals in direct sequence spread spectrum communication systems utilizing antenna arrays. The role of ICA is to provide an interference-mitigated signal to the conventional detection. Several ICA algorithms exist for performing Blind Source Separation (BSS). ICA has been used to extract interference signals, but very less literature is available on the performance, i.e., how does it behave in communication environment. This needs an evaluation of its performance in communication environment. This paper evaluates the performance of some major ICA algorithms like Bell and Sejnowskis infomax algorithm, Cardosos joint approximate diagonalization of eigen matrices (JADE) algorithm, Hyvarinens fixed point algorithm, Pearson-ICA algorithm and Comons algorithm in a communication blind source separation problem. Independent signals representing sub-Gaussian, Gaussian and mix users(sub-Gaussian, super-Gaussian and Gaussian) are generated and then mixed linearly to simulate communication signals. Separation performance of ICA algorithms measure by performance index.

Challenges in mobile transformations: a requirements modeling perspective for small and medium enterprises

This paper outlines the challenges faced in mobile-transformations (m-transformation) of organisations. This paper builds on our existing knowledge of electronic-transformations of small and medium enterprises (SMEs). Hence the conceptual framework resulting from this work deals with m-transformations of SMEs. Our aim is to build a theoretical foundation resulting from investigations of those particular characteristics of SMEs that influence their uptake of mobile technologies and processes.

Semantic Integration of Environmental Web Services in an Organization

Greening an organization encompasses many different aspects, not just recycling or stopping use of toxic materials and replacing it with some more environmental friendly material. There is a growing need to measure and calculate the environmental impact of the product, process and services. Turning an organization green includes green building practices. This paper provides a conceptual tool to track, report, manage and finally monetize the emissions using the web services termed as Green Web Services (GWS). These web services recognize the disproportionate environmental impact of a process in an organization. GWS provides solutions that can be used to substitute the physical activities and thereby reduce society’s energy consumption and carbon emission. This paper presents and extends a corporate Environmental Responsible Business Strategy (ERBS) that brings together GWS and business responsibilities, resulting in Environmentally Intelligent System (EIS).

Extending Enterprise Architecture with Mobility

This paper discusses the extension of the Enterprise Architecture (EA) with mobile technologies. The mobile technologies provide the modern business with benefits of location and time independence in their internal as well as external business processes. Mobile Technologies (MT) in the context of EA include wireless networks, handheld devices and mechanisms to store and present contents. This paper provides a strategic approach to adoption to MT, as against mere repetition of electronic commerce on the mobile device.

Green Enterprise Architecture using Environmental Intelligence

This paper discusses Green Enterprise Architecture GEA, which is an extension and application of Enterprise Architecture in the environmental domain. A GEA makes strategic use of the green IT systems otherwise also known as CEMS-Carbon Emission Management Software-that results in an all-encompassing approach to the greening effort that incorporates carbon data, information, processes, and knowledge in the organizations decision making. This paper highlights the significance of such a strategic approach to carbon control in practice. The challenges associated with implementing Green IT in organizations can be handled through a carefully construed green IT systems architecture that will not only enable implementation of dedicated system for carbon measures but also facilitate upgrade and integration of existing suite of ERP applications that incorporate carbon measures.

Applying a Composite Process Framework (CPF) in Real Life Software Development Project

This paper presents the outcome of an action research study that was conducted to validate the application of a Composite Process Framework (CPF) in real life software development project. This research extends an existing application software development methodology to incorporate the composite process framework and tailor it to meet the needs of a particular software development project. This paper also discusses the importance of the agile approach to software development and its role in the CPF. This is so because the CPF aims a proper balance of ceremony and agility in a project - based on an argument that no single ‘type’ of process appears to be suitable for software development projects.

Iterative class diagram construction in consideration of modeling granularity

This paper presents an effective and efficient class modeling approach in light of granularity of software architecture. While class model constructions have discussed architectural and process principles, in this paper we highlight the concept of granularity and the resultant iterative manner of class modelling wherein modeling tasks are carried out iteratively and where technical details are added gradually. As a part of this granular approach, class relationships and their semantics are also enriched gradually by identifying intra-family and inter-family relationships in the large, and identifying attribute-level and method level associations in the small. Modeling aspects of class diagrams at different abstraction levels have been examined, which can be used for effective class model construction and verification. Furthermore, we suggest the use of adornments to clarify sophisticated features of a class, and leave implementation specific aspects to implementation views. Such approach, we hope will obviate the trap of over modelling with implementation specific details in early stages.