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In this paper, we are proposing a novel optical multiple access approach which utilizes the interleaving as only means of user separation. This is different from conventional code division multiple access schemes in which different signature sequences are used to distinguish users. Optical interleave-division multiple-access (OIDMA) scheme inherits the advantage of both Optical system and IDMA technique...
In wireless communication, regarding all the multiple access schemes, fading is referred to be major problem in multipath environment. Recently, IDMA scheme has attracted much attention of the researchers all over world as a potential candidate for future generation wireless communication systems. This scheme has also been victim of fading phenomena during communication process. In this paper, the...
The group delay function has been used conventionally in temporal spectral analysis and feature extraction for speech recognition. In this work we present a detailed analysis of a novel approach to spatial spectral analysis of speech using the MUSIC-Group delay spectrum. In our previous work we have proposed the use of the MUSIC-Group delay spectrum [ICASSP 2010], for direction of arrival estimation...
In recently proposed multiple access techniques such as IDMA and OFDM-IDMA, the user separation is done by user specific interleavers in contrast to conventional CDMA scheme where user separation is assured with user-specific signature sequences. The user specific interleavers must demonstrate minimum probability of collision amongst each other in addition to other merits including minimal consumption...
This paper is concerned with the performance improvement of iterative Interleave-Division Multiple-Access (IDMA) scheme based receivers using optimum power allocation algorithm using tree based interleavers (TBI). Based on the optimized power allocation technique, we compare the performance of IDMA receiver with random interleaver, power interleaver, and tree based interleaver. The simulation results...
In wireless communication, fading problem is mitigated with help of diversity techniques. This paper presents Maximal Ratio Combining (MRC) diversity approach to uproot the fading problem in interleave-division multiple-access (EDMA) scheme. The approach explains maximal ratio combining diversity technique, with one transmit and two received antennas in low rate coded environment. In the simulations,...
Power allocation with unequal strategy, is a technique to further enhance system performance in multiple access schemes. This paper is basically related with the performance enhancement of iterative IDMA systems using unequal optimum power allocation algorithm. Here, we compare the performance of coded and uncoded IDMA system with random interleaver & tree based interleaver. The simulation results...
This paper is concerned with the performance enhancement of IDMA systems using optimum power allocation algorithm. Based on the optimized power allocation technique we compare the performance of coded and uncoded IDMA system with random interleaver & tree based interleaver. The simulation results demonstrate the superior performance of tree based interleaver in comparison to random interleavers.
This paper presents analysis results of synchronized phasor data from 10 disturbance events recorded in the US Eastern Interconnection (EI). The phasor data covers a wide region in the EI, allowing for the study of disturbance propagation, interarea modes, and oscillations in voltages and currents. The analysis is not straightforward because the EI is a meshed system with adequate interarea mode damping...
Here, we propose a novel tree based interleaver (TBI) for generating user specific chip-level interleaving sequences for various users in an IDMA system, which reduces computational complexity drastically. This interleaver also solves the memory cost problem and reduces the amount of information exchange between mobile stations and base stations required to specify the interleaver. Simulation results...
This paper discusses a research project: rule-based Web user profiling platform. In this platform, usage data are encoded as a sequence of events, each of which represents an action performed by a user on a Web service at a given time. An event template is proposed to define event models for different Web services. The platform is rule-based. Rules define profile metrics and determine how to compute...
In this paper the impacts of voltage scheduling on the power system performance are studied for different set of key buses. The generator buses and the buses to which reactive sources are installed form the key buses for voltage scheduling. Two cases are studied for the evaluation of impacts of voltage scheduling. Casel considers the conventional IEEE 30-bus system with the suggested buses for condensers...
Summary form only given. Intense laser ablation induced shocks have been found use in the field of high pressure and high energy density physics studies viz. equation of state (EOS) measurements, phase transformations, understanding astrophysical high density plasma phenomena etc. Several megabars of pressures can now be generated, under laboratory conditions using modest laser intensities. To achieve...
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