Abstract:

In traditional subcarrier allocation algorithms, the problem of unfairness between the celledge users and cellcenter users and varying power allocation in downlink coordinated multiple point transmission/reception (CoMP) system is ignored. To solve this problem, a suboptimal subcarrier and power allocation algorithm to maximize all the users throughput in one sector is proposed. In this algorithm, the frequency bandwidth that the celledge users can occupy is extended to the whole frequency bandwidth that the BS (base station) assigns to the cell, the cellcenter users and celledge users compete for the optimal subcarrier through the proportional fairness algorithm which will ensure the fairness. Then according to the optimization objective function and the proposed subcarrier allocation algorithm, the minimum rate and the proportional fairness constraint are introduced in connection to all the users. At last, the power allocated to each user is calculated using the Lagrange multiplier method. Simulations show that this algorithm will improve all the users fairness and throughput obviously.

Key words: coordinated multiple point transmission/reception , sub-carrier, throughput, power allocation