2 research outputs found
Dynamic frequency reuse: a method for interference mitigation in OFDMA Based LTE-A Networks
Spectrum scarcity is one of the most discussed restraining aspects in wireless
communication system. To solve this issue Frequency Reuse (FR) concept is introduced. It
is a promising development to fulfil the requirement of Long Term Evolution Advanced
(LET-A). With the introduction of FR comes the problem of Inter Cell Interference as the
neighboring eNodeBs (eNB) which uses the same frequency band that will act as an
interference source. In this paper, a Dynamic Frequency Reuse (DFR) method is
anticipated. Continuous optimization of resource allocation of each cell is considered in
this method. The important focus of the paper is to expand the capacity of the users
placed in cell edge areas by reducing out of cell interference. Simulation has been done to
prove that the proposed scheme leads to efficient resource management
Efficient Advanced Encryption Standard for Securing Cognitive Radio Networks
During the last decade, the CR (Cognitive Radio) came into view as a major wireless technology to resolve the issue of spectrum secrecy and efficient spectrum utilization. However, due to unlicensed (secondary) users, there are various security threats to the CRN (Cognitive Radio Networks). Some malicious users may access the CRN and mislead the secondary users to vacate the occupied channel, which may stop the communication. In this work, we propose a new cryptographic-based algorithm, CRAES (Cognitive Radio-Advanced Encryption Standard), inspired by the traditional AES to secure the CRN. The data of the primary and secondary users is encrypted at the transmitter and decrypted at the receiver. Unlike the conventional AES, we introduce the data-dependent key-generation and shift-rows process. We also reduce the rounds of AES from 10-6 to improve the computational efficiency without compromising the overall security. The experimental results demonstrate the effectiveness of the proposed CR-AES in terms of better security, reliability, and computational efficiency