Abstrakt

Efficient Allocation of Power Resource in OFDMA Systems with Diverse Modulation Techniques

K.Sneha , Dr.Ch Santhi Rani, A.B.L.Mounika, K.Vivek, K.S.Murali Krishna , K.R.V.M Sankar

Of late there is an utmost need for providing higher data rate and better Quality of Service(QoS) for ever increasing number of users in wireless communication systems. The Orthogonal Frequency Division Multiplexing (OFDM) is one of the leading candidates for future wireless communication systems. This paper gives a brief introduction about OFDMA and discusses in depth about allocation of power resource to all the active users present in a cellular network in an optimum way using the Load Matrix approach. Load Matrix approach is used to calculate the average interference within the cells based on RoT (Rise over Thermal noise) and distribute minimum required SINR to each user thereby enhancing the Quality of Service (QoS) of the network. The approach is first experimented on a single carrier communication system and then it is extended to multi-carrier systems. This paper also deals with the performance of a communication link in terms of BER for various digital modulation techniques. From simulations it is observed that performance of QAM is better than QPSK in systems implementing OFDMA.