Informatics Publishing Limited

C. T. Manimegalai ¹, Sabitha Gauni ¹, K. Kalimuthu ¹, R. Kumar ¹

Affiliations
1 Telecommunication Engineering Department and ECE, SRM University, Kattankulathur - 603203, Tamil Nadu, IN

Abstract

Ultra Wide Band (UWB) technology is a fast emerging technology for short distance wireless communication. UWB plays a preeminent role in the short range wireless systems, due to the advantages of high speed, low power consumption and very high security. Methods/Statistical Analysis: With cooperative communication as a decisive member in its side this paper proposes cooperative MB-OFDM communication using effective grouped relays in multichannel with use of Dual Carrier Modulation (DCM) for UWB systems. We can attain maximum diversity by using simple Maximum Likelihood (ML) receiver without reduction of data rate as its found using almounti coding which is most used to provide diversity in cooperative communication. Findings: The Proposed method’s resulting diversity is observed using outage probability as a basic parameter and also how the outage probability varies in accordance to threshold power. Application/Improvements: The results shows an improved BER versus SNR with effect of CFO is considered and the improvement in channel capacity and data rate of various different modulation schemes is obtained by varying SNR and distance.

Keywords

Dual Carrier Modulation (DCM), MultiBand Orthogonal Frequency Division Multiplexing (MB-OFDM), Single-Input Multi-Output (SIMO), Multi-Input Multi-Output(MIMO), Ultra Wide Band (UWB)

Full Text

   

C. T. Manimegalai ¹, K. Kalimuthu ¹, Sabitha Gauni ¹, R. Kumar ¹

Affiliations
1 Department of Telecommunication Engineering and ECE, SRM University, Chennai - 603203, Tamil Nadu, IN

Abstract

Background/Objectives: In underlay cognitive radio network, the power control systems play a major role where the secondary users should not affect the primary users transmission. The interference constraints are not attained by all users as the Signal to Interference Noise Ratio (SINR) of the target requirement is not satisfied in the distributed algorithm for power control. Hence, an algorithm is proposed to reduce the power and to regulate the interference constraints of the primary and secondary users. The SINR also has to be maintained. In the proposed method, the distributed statistical algorithm is used when the interference constraints is not available when all transmitters are in active mode to obtain an efficient solution. Methods: In order to minimize the level of SINR for each link between primary and secondary user, a distributed algorithm for power control is proposed. The traditional power control algorithms are used to maintain the secondary users transmission within specific power levels. The main drawback of the traditional algorithms is that the constraints are not met when all the transmitters are active. Result: A Power minimizing algorithm along with the distributed statistical elimination algorithm, to suppress the transmission of selected number of links when all the nodes are active is proposed. This satisfies the SINR requirement of the secondary links. Application: The proposed elimination algorithm enables the optimized power distribution, hence it is a more practical solution in networks with increased number of secondary users.

Keywords

Cognitive Radio Networks (CRN), Distributed Stochastic Algorithms (DSA), Distributed Algorithm for Power Control, Interference Constraints, Power Reduction Algorithm

Full Text