Informatics Publishing Limited

Sreevardhan Cheerla ¹, D. Venkata Ratnam ¹, M. Siva Ganga Prasad ¹, B. Vyshanvi ¹, A. Sai Nitin ¹

Affiliations
1 Department of ECE, KLEF, KL University, Vaddeswaram - 522502, Guntur, Andhra Pradesh, IN

Abstract

Femto cell plays major role in the modern wireless communication systems applications. Femto cell provides higher data rates with a tiny base station. The prime concern in femto cell is power allocations for mobile receiver due to interferences. There is a need to develop a suitable power allocation algorithm to improve performance of femto cells. In this paper, an optimized power algorithm Distributive Power Control with Active Link Protection (DPC /ALP) is implemented. The proposed algorithm is tested under MATLAB simulated Long Term Evolution (LTE) environment and also evaluated with existing power allocation techniques i.e. fixed power scheme and power adaptive SINR. It is found that 39 % improvement of power optimization is obtained when compared to the other techniques. The outcome of this research work would be immensely useful for developing robust power optimization techniques for femto cells

Keywords

Active Link Protection (ALP), Distributed Power Control, Femto Cells, LTE, SINR

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C. S. Preetham ¹, M. Siva Ganga Prasad ², T. V. Ramakrishna ¹

Affiliations
1 Department of Electronics and Communication Engineering, K L University, Guntur - 522017, Andhra Pradesh, IN
2 Department of Electronics and Communication, KKR and KSR Institute of Technology and Sciences, Guntur – 522502, Andhra Pradesh, IN

Abstract

Objectives: In this paper, we consider a hybrid overlay/underlay strategy to maximize the throughput of primary users by use of idle secondary users as relays. Specifically, we focus on incorporating the advantageous features of underlay and overlay transmission methods into a hybrid cognitive radio technique. Analysis: By the use of the proposed technique both the primary and secondary users get benefited, as their communication link is uninterrupted. This scheme helps as an incentive for primary users to share their spectrum with the secondary users. Findings: The paper presents a resource allocation algorithm for the hybrid overlay/underlay transmission method. Also, the performance of the opportunistic and partial relay selection is investigated. This resource allocation algorithm is used to select the best channel from relay to destination, best relay and power allocated to best relay. Simulation results are presented to demonstrate the performance of the proposed hybrid technique over the traditional methods. The effectiveness of usage of the partial and opportunistic relay selection techniques is compared and the conclusions are drawn. Improvements: The proposed scheme will eliminate the need to switching between the overlay and underlay techniques. The resource allocation along with proposed hybrid transmission scheme will give significant improvement in SNR of primary user.

Keywords

Cognitive Radio, Hybrid CR Scheme, Overlay, Opportunistic Relay Selection, Partial Relay Selection, Resource Allocation, Underlay.

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P. Venkatapathi ¹, S. Srinivasa Rao ², M. Siva Ganga Prasad ¹

Affiliations
1 KL University, Guntur, Andhra Pradesh, IN
2 ECE Department, MRCET, Hyderabad, Telangana, IN

Abstract

Due to the improved usage of wireless communications in commercial, governmental and personal capacities, efficient spectrum utilization has turn out to be a prime topic of interest. A potential solution to this inefficiency problem is cognitive radios (CR). The spectrum sensing is important key function of CR. It is used to detect primary user. Energy Detection(ED) is a most commonly used technique for spectrum sensing.

Keywords

Cognitive Radio, Energy Detection Spectrum Sensing.

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