PERFORMANCE ANALYSIS OF RESOURCE ALLOCATION SCHEMES IN
LTE OFDMA SYSTEMS
Kavitha.P 1, Dr.Shanmugavel.S 2
1 PG Student, 2 Professor
1,2 Department of ECE, National Engineering College (Autonomous), Kovilpatti, Tamilnadu, India.
This paper deals with the network spectral efficiency/capacity analysis of downlink Long Term Evolution (LTE) Multiple-Input Multiple-Output (MIMO) Orthogonal Frequency Division Multiplexing (OFDM) system with Nc cells in a network. In a multi-cell cellular communication, the inter-cell interference (ICI) is detrimental in achieving the intended system performance, in particular for the edge user. To reduce the ICI, Fractional Frequency Reuse (FFR) method is compared in suburban Macro environment. Assuming that each transmitter (i.e) evolved Node B (eNB) is equipped with t antennas and each receiver (i.e) User Equipment (UE) with r antennas for each subcarrier and each receiver implements single-user detection, in the absence of channel state information at the transmitter (CSIT), the network spectral efficiency is limited due to equal power into antennas. Further, capacity improvement is possible with stronger CSI assumption. This is achieved through interference suppression by transmit beam forming approach. An expression for spectral efficiency is derived in the absence and presence of perfect CSIT. The simulation shows an improvement with perfect CSIT when the number of transmitting antennas gets increased.
