사용자 공정성을 위한 MU-MIMO 시스템에서 반직교 사용자 선택 알고리즘에 중첩 코딩 적용 연구

Abstract

Nowadays, various researches fulfill in many communication engineering area for B4G(Beyond Forth Generation). Next LTE-A (Long Term Evolution Advanced), MU-MIMO(Multi-User Multi Input Multi Output) method raises to upgrade throughput performance. However, the method of user selection is not decided because of many types and discussionsin MU-MIMO system. Many existing methods are powerful for enhancing performance buthave various restrictions in practical implementation. Fairness problem is primary restrictionin this area. Existing papers emphasis algorithm to increase sum-rate but we introduce analgorithm about dealing with fairness problem for real commercialization implementation. Therefore, this paper introduces new user selection method in MU-MIMO system. Thismethod overcomes a fairness problem in SUS (Semiorthogonal User Selection) algorithm. Wecan use the method to get a similar sum-rate with SUS and a high fairness performance. And this paper uses a hybrid method with SC-SUS (Superposition Coding SUS) algorithmand SUS algorithm. We find a threshold value of optimal performance by experimentalmethod. We show this performance by computer simulation with MATLAB and analysis thatresults. And we compare the results with another paper’s that different way to solve fairnessproblem.