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The general gaussian numerous entrance wire-tap channel(GGMAC-WT) and the guassiantwoway wire-tap channel(GTW-WT) are considered. In this paper, we learn about the mystery correspondence between the correspondence channels with exacerbate various access channel(CMAC). Secret messages are exchanged with consummate mystery. In this channel the messages sent by one channel can be decoded by its relating recipient and kept mystery from other beneficiary. A MAC is considered and the messages from the encoders ae secret. By and large, our outcomes demonstrate that in various access situation, clients can help each other to on the whole accomplish positive mystery rates. At the end of the day, collaboration among clients can be priceless for accomplishing mystery for the framework.

Quadrature Orthogonal Frequency Division multiple access (Q-OFDMA) has been renowned as a promising technique which provides a solution to the high PAPR (Peak to average power ratio), sensitivity to carrier frequency offset (CFO) problem and design complexity as introduced by the normal OFDMA systems. Exploiting this Q-OFDMA systems on the Multi-Input Multi-Output (MIMO) architecture, leads to a remarkable improvement in achievable rates. A critical part of this technology is to design the full-rate diversity codes for two transmit and two receive antennas. This paper endeavours to identify key factors and trade-offs issues associated with designing Q-OFDMA systems. We proposed a Space Time Block Codes and spatial multiplexing technique as well as low complexity detection methods for more than 2x2 antennas at the cost of low complexity. This performs well for different fading channel environments and improves the overall system performance such as diversity gain, SNR (Signal to Noise Ratio), Coding gain and BER (bit error rate. The proposed scheme can be easily applied in OFDMA and Single-Carrier Frequency Division Multiple Access (SC-FDMA) by adjusting the parameters of Q-OFDMA.

A 51-kiloton magnetised Iron Calorimeter (ICAL) detector, using Resistive Plate Chambers (RPCs) as active detector elements, aims to study atmospheric neutrinos. A prototype -1/600 of the weight of ICAL, called mini-ICAL was installed in the INO transit campus at Madurai. A modest proof-of-principle cosmic muon veto detector of about 1 m × 1 m × 0.3 m dimensions was setup a few years ago, using scintillator paddles. The measured cosmic muon veto efficiency of 99.98% and simulation studies of muon-induced background events in the ICAL detector surrounded by an efficient veto detector were promising. This led to the idea of constructing a bigger cosmic muon veto around the mini-ICAL detector. Details of the design and construction of the detector including the electronics, trigger and DAQ systems planned will be briefly presented.