CAJ | 학술논문

针对多小区OFDMA系统下行链路，研究了用户公平性约束下的资源分配问题，提出了一种多基站协作的迭代优化的分布式资源分配算法。每个小区根据干扰状况及用户公平性，迭代地进行子载波和功率的资源优化；而每次迭代中，根据用户公平性准则分配子载波，并将非凸的小区功率优化问题转化为其下界的凸问题，通过一个分布式算法来求解。通过仿真验证了算法的有效性；仿真结果表明，与传统网络的固定功率分配的情形相比，所提算法保证了用户之间的公平性并显著提高了系统吞吐量。
침대다소구OFDMA계통하행련로，연구료용호공평성약속하적자원분배문제，제출료일충다기참협작적질대우화적분포식자원분배산법。매개소구근거간우상황급용호공평성，질대지진행자재파화공솔적자원우화；이매차질대중，근거용호공평성준칙분배자재파，병장비철적소구공솔우화문제전화위기하계적철문제，통과일개분포식산법래구해。통과방진험증료산법적유효성；방진결과표명，여전통망락적고정공솔분배적정형상비，소제산법보증료용호지간적공평성병현저제고료계통탄토량。
The resource allocation with user fairness is considered for the downlink of a cellular orthogonal frequency division multi-access ( OFDMA) system, in which multiple base stations are coordinated itera-tively by a distributed resource allocation algorithm. In each cell, an iterative algorithm is proposed to opti-mize subcarrier and power allocation alternatively, while taking into consideration both the inter-cell inter-ference and the fairness among the users. In each iteration, the subcarrier allocation is updated by user fairness, while the power allocation is updated by solving a convex optimization problem as lower bound with a distributed optimal algorithm. The effectiveness of the algorithm has been illustrated by numerical experiments. The result of simulation indicates that the proposed scheme could significantly improve the o-verall network throughput while maintaining fairness as compared to a conventional network with fixed transmit power spectrum.