Optimal Power Allocation for Channel Estimation in MIMO-OFDM System with Per-Subcarrier Transmit Antenna Selection

A novel hybrid channel estimator is proposed for multiple-input multiple-output orthogonal frequency- division multiplexing (MIMO-OFDM) system with per-subcarrier transmit antenna selection having optimal power allocation among subcarriers. In practice, antenna selection information is transmitted through a binary symmetric control channel with a crossover probability. Linear minimum mean-square error (LMMSE) technique is optimal technique for channel estimation in MIMO-OFDM system. Though LMMSE estimator performs well at low signal to noise ratio (SNR), in the presence of antenna-to-subcarrier-assignment error (ATSA), it introduces irreducible error at high SNR. We have proved that relaxed MMSE (RMMSE) estimator overcomes the performance degradation at high SNR. The proposed hybrid estimator combines the benefits of LMMSE at low SNR and RMMSE estimator at high SNR. The vector mean square error (MSE) expression is modified as scalar expression so that an optimal power allocation can be performed. The convex optimization problem is formulated and solved to allocate optimal power to subcarriers minimizing the MSE, subject to transmit sum power constraint. Further, an analytical expression for SNR threshold at which the hybrid estimator is to be switched from LMMSE to RMMSE is derived. The simulation results show that the proposed hybrid estimator gives robust performance, irrespective of ATSA error

Comparison Of Modified Dual Ternary Indexing And Multi-Key Hashing Algorithms For Music Information Retrieval

In this work we have compared two indexing algorithms that have been used to index and retrieve Carnatic music songs. We have compared a modified algorithm of the Dual ternary indexing algorithm for music indexing and retrieval with the multi-key hashing indexing algorithm proposed by us. The modification in the dual ternary algorithm was essential to handle variable length query phrase and to accommodate features specific to Carnatic music. The dual ternary indexing algorithm is adapted for Carnatic music by segmenting using the segmentation technique for Carnatic music. The dual ternary algorithm is compared with the multi-key hashing algorithm designed by us for indexing and retrieval in which features like MFCC, spectral flux, melody string and spectral centroid are used as features for indexing data into a hash table. The way in which collision resolution was handled by this hash table is different than the normal hash table approaches. It was observed that multi-key hashing based retrieval had a lesser time complexity than dual-ternary based indexing The algorithms were also compared for their precision and recall in which multi-key hashing had a better recall than modified dual ternary indexing for the sample data considered.Comment: 11 pages, 5 figure

Short course chemotherapy in the treatment of brain tuberculoma - a controlled clinical trial

74 cases diagnosed to have brain tuberculoma on the basis of clinical and CT Scan criteria have been admitted to study in a 24 month period from October, 1986. These cases were randomly allocated to either Rif+INH+Pyrazinamide given daily or thrice weekly for 3 months followed by Rif and INH twice-weekly for a period of 6 months. therapy and The efficacy of short course chemothe serial CT Scan changes in relation to therapy are being evaluated in this prospective study. A biopsy is done after 2 months of treatment if the scan does not show 20% reduction in size of the mass

Chitosan/Modified Banana Epidermis Starch Composite Films for Food Packaging Applications

Banana epidermis is a waste material and starchier, it can be used to made biodegradable composite film and their properties were characterized. The aim of this study was to develop biodegradable composite films based on modified banana epidermis starch. The role of modified banana epidermis starch (MBES) particle loadings were analyzed on chitosan semi-crystalline structure, in addition to studying the composite film properties such as barrier, thermal and mechanical properties. Antimicrobial activity of the composite films is developed based on chitosan and MBES particle. The composite films are produced by solution casting method. The composites exhibit a significantly good in the mechanical and thermal stability. The resulting Chitosan/MBES films exhibit better oxygen permeation rate while compared with normal commercial films. The new prepared composite films have a high potential, mechanical, morphological, antimicrobial activity, and to improve their long-lasting antimicrobial efficiency for food packaging applications

Traffic Performance Analysis of Manet Routing Protocol

The primary objective of this research work is to study and investigate the performance measures of Gossip Routing protocol and Energy Efficient and Reliable Adaptive Gossip routing protocols. We use TCP and CBR based traffic models to analyze the performance of above mentioned protocols based on the parameters of Packet Delivery Ratio, Average End-to-End Delay and Throughput. We will investigate the effect of change in the simulation time and Number of nodes for the MANET routing protocols. For Simulation, we have used ns-2 simulator.Comment: 12 pages,12 figure

Performance Analysis of Network Coding with Exponential back off Algorithm Using Multi Path Transfer Protocol in Wireless Network

Network coding is an effective technique to boost the capacity of wireless networks. In that network, transmitted data is encoded and decoded to increase network throughput and to reduce end to end delay and make the network more robust. In this paper, the throughput and end to end delay of network coding is investigated under IEEE802.11 DCF. It is proposed that this can be achieved with CSMA/CA as in IEEE802.11 distributed coordination function with Multi Path Transfer Protocol (DCF-MPTP). CSMA/CA is based on the combination of physical carrier sensing and exponential back off algorithm. Proposed model prevents the delay and packed loss

Some Graph Parameters of Clique graph of Cyclic Subgroup graph on certain Non-Abelian Groups

The aim of this paper is to examine various graph parameters of clique graph of cyclic subgroup graph on certain non-abelian groups and also we obtain some theorems and results in detai

IN SILICO SCREENING AND PREDICTION OF LYCOPODIELLA CERNUA L. AGAINST CRYSTAL STRUCTURE OF DNA GYRASE

Objective: The point of the review was centered around hindrance DNA Gyrase by mixtures of Lycopodiella cernua L., a perpetual plant through in silico studies. Methods: The Chemical mixtures of the plant test was gathered from the L. cernua L. Molecules that fall inside Lipinski’s standard of five such particles are frequently distinguished and finished for docking. The natural action of the mixtures was dissected utilizing the pass online device. The worth of Probability to be dynamic (Pa) and idle (Pi) are investigated. The few mixtures recovered from the plant were examined for its conceivable critical cooperation with the objective protein utilizing sub-atomic docking studies. Results: The compound 2-Ethylacridine had G-Score of - 7.1 Kcal/mol and framed hydrogen bonds with the buildup GLY showing the bond length of 2.0. The future point of view of the review is to decide the strength of the protein-compound complex through elements studies. The connections were noticed utilizing Pymol. Conclusion: The came about compound showed higher adequacy than controlled (anti-microbial) compound, this demonstrates the plants potential to be a successful medication compound towards the objective. The plant mixtures ought to be investigated more to be an effective and potential medication particles

Signal Integrity Analysis of Modified Coplanar Waveguide Structure Using ADI-FDTD Method

Very Large Scale Integration (VLSI) technology shrinks to Deep Sub Micron (DSM) geometries, interconnect is becoming a limiting factor in determining circuit performance. High speed interconnect suffers from signal integrity effects like crosstalk, and propagation delay thereby degrading the entire system operation. In order to reduce the adverse signal integrity effects, if is necessary for the interconnect to have accurate physical dimensions. The interconnection and packaging related issues are main factors that determine the number of circuits that can be integrated in a chip as well as the chip performance. In this paper, it is proposed to simulate high speed interconnect structures using Alternate Direction Implicit Finite-Difference Time-Domain Method (ADI-FDTD) method. The electrical parameters such as mutual inductance and mutual capacitance were calculated from E and H fields for Coplanar waveguide (CPW) and Stacked Grounded Coplanar waveguide (SGCPW). Keywords: Interconnects, ADI-FDTD Method, Coplanar Waveguide, Crosstalk and Signal Integrit