中文摘要：

在无线环境下,随着用户数的增加和速率需求的提高,基站能量消耗越来越大。因此,无线网络中能量有效化的设计变得非常必要。本文研究了一种能量有效的多用户OFDM下行链路的资源分配方案。利用分布式方式,首先根据用户的平均信道增益和最低用户比特要求,结合提出的能量有效准则思想分配子载波数;然后按照各用户分配的子载波数分配信道条件较好的信道;再对每个用户所分配的信道按照最低比特要求平均分配比特数,并利用能量有效准则做最优调整,保证功率最小。仿真结果表明,在满足各用户的误比特率及速率要求的条件下,提出的算法与静态的频分多址资源分配方式相比,功率可减小5～6 dB;同时与已有的一种经典分布式算法相比,功率可减小2～4 dB。

英文摘要：

In wireless environment, the increases in the number of users and the demand for a higher rate have triggered rapidly booming energy consumption at the base station. Therefore, energy efficient design in wireless network has become very essential. An energy efficient multi-user OFDM downlink resource allocation scheme was studied, using the distributed way. Firstly, according to user＇s average channel gain and the minimum requirements of user＇s bits, subcarriers were allocated, combined with the idea of proposed energy-efficient criterion. Then better channels were assigned to each user in accordance with each user＇s allocated subcarrier numbers. Again each user＇s average bits were assigned on the user＇s allocated subearriers and optimal adjustment using energy-efficient criterion had to be made to ensure the minimum power. The simulation results show that under the conditions of satisfying bit-error rate and transmission rate for users, the power can be reduced by 5-6 dB in the proposed algorithm, compared with the power in the static frequency division multiple access resource allocation. Furthermore, the power can be reduced by 2-4 dB, compared with the power in a existing classical distributed algorithm.