Sree Vardhan Cheerla ¹, D. Venkata Ratnam ¹, Allada Sai Nitin ¹, T. Durga Sai Sruthi ¹

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

Abstract

Cognitive Radio (CR) is an unprecedented concept in wireless communication and it is a technical solution to perfect utilization of spectrum. CR sense the presence of licensed primary users through measuring parameters related to channel characteristics. The power spectrum gives vital information with regard to the presence of a user at every frequency. In this paper we analyzed different spectrum sensing techniques like energy detection, Fast Fourier Transform Averaging Ratio (FAR) whose performance is low in non-stationary environment. In this paper we proposed Hilbert Huang Transform detector (HHT) to detect presence of primary user. In practical scenario, non-stationary and nonlinear processes can be efficiently detected by this HHT. It is evident from the results that the HHT transform average ratio detector outperformed the FFT average ratio detection.

Keywords

Cognitive Radio, Hilbert- Huang Transform, Intrinsic Mode Functions (IMF), Non- Stationary, Spectrum Sensing

Full Text

   

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

Full Text