Browsing by Author "Kaur, I."

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Adaptive OFDM vs single carrier modulation with frequency domain equalization
(2009) Kaur, I.; Thakur, K.; Kulkarni, M.; Gupta, D.; Arora, P.
The aim of the present paper is to compare multicarrier and single carrier modulation schemes for wireless communication systems. In both cases the fast Fourier transform (FFT) and its inverse are utilized. In case of OFDM (orthogonal frequency division multiplexing), the inverse FFT transforms the complex amplitudes of the individual subcarriers at the transmitter into time domain. At the receiver the inverse operation is carried out. In case of single carrier modulation, the FFT and its inverse are used at the input and output of the frequency domain equalizer in the receiver. Different single carrier and multi-carrier transmission systems are simulated with time-variant transfer functions measured with a wideband channel sounder. In case of OFDM, the individual sub-carriers are modulated with fixed and adaptive signal alphabets. Furthermore, a frequency-independent as well as the optimum power distribution are used. Single carrier modulation uses a single carrier, instead of the hundreds or thousands typically used in OFDM, so the peak-to-average transmitted power ratio for single carrier modulated signals is smaller. This in turn means that a SC system requires a smaller linear range to support a given average power. This enables the use of cheaper power amplifier as compared to OFDM system. � 2009 IEEE.
Semantic Web service selection based on business offering
(2008) D'Mello, D.A.; Kaur, I.; Ram, N.; Ananthanarayana, V.S.
Semantic Web service discovery finds a match between service requirement and service advertisements based on the semantic description. The discovery mechanism does not consider quality and business offers of advertised Web services. In this paper, we propose ontology based Semantic Web service architecture for selection which recommends the best match for the requester. We design semantic broker which allows providers to advertise their services by creating OWL-S service profile consisting of functional, quality and business offers. The broker computes and records information for matchmaking during service publishing to improve the performance. The broker reads requirements from the requester and finds the best (profitable) Web service by matching functionality, capability, quality and business offers. � 2008 IEEE.
Semantic Web service selection based on business offering
(2008) Dâ€™Mello, D.A.; Kaur, I.; Ram, N.; Ananthanarayana, V.S.
Semantic Web service discovery finds a match between service requirement and service advertisements based on the semantic description. The discovery mechanism does not consider quality and business offers of advertised Web services. In this paper, we propose ontology based Semantic Web service architecture for selection which recommends the best match for the requester. We design semantic broker which allows providers to advertise their services by creating OWL-S service profile consisting of functional, quality and business offers. The broker computes and records information for matchmaking during service publishing to improve the performance. The broker reads requirements from the requester and finds the best (profitable) Web service by matching functionality, capability, quality and business offers. Â© 2008 IEEE.