Subcarrier and Power Allocation with Proportional Fairness algorithm for LTE System

摘要

In wireless communication systems which uses OFDM as modulation technique, the prevailing trend is the dynamic assignment of resources like subcarrier and number of bits per subcarrier. In multiuser scenario, received signal strength of each user varies with the distance from the base station. The algorithms which target to maximize throughput, assigns more resources to the better channel conditioned user which may result into unfair distribution of resources. Attempts to achieve fairness sacrifice system throughput. The proportional fairness algorithm nicely handles this trade off. We have examined performance of the proportional fairness algorithm in realistic conditions with large numbers of users with scattered locations throughout the cell. Furthermore, this algorithm is examined with appropriate power allocation on each subcarrier along with subcarrier allocation. Comparison of proportional fairness algorithm is carried out with sum rate maximization algorithm. We have considered realistic conditions with variable distance from base station and LTE standard.