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本文针对多用户环境下的多天线正交频分复用下行系统,提出了一种新的基于迫零波束成型的用户调度算法。迫零波束成型是在发送端消除用户间的干扰生成多个独立的空间子信道,来实现空间复用。由于在多天线正交频分复用下行系统中最优的用户选择算法需要遍历所有可能的用户集合,算法复杂度非常大,本文提出了一种简化算法。所提算法在保证每个用户的速率要求的情况下,通过贪婪算法来选择每个子载波上的用户集合,以最小化系统的发送功率。仿真结果表明在满足用户的速率要求下能达到很好的系统性能。
This paper proposes a new user scheduling algorithm based on zero-forcing beamforming for multi-antenna orthogonal frequency division multiplexing downlink system in multi-user environment. Zero forcing beamforming is to eliminate the interference between users at the sending end to generate multiple independent spatial sub-channels to achieve spatial multiplexing. Because the optimal user selection algorithm needs to traverse all possible user sets in multi-antenna orthogonal frequency-division multiplexing downlink system, the complexity of the algorithm is very large. In this paper, a simplified algorithm is proposed. The proposed algorithm selects the set of users on each subcarrier by the greedy algorithm to ensure the transmission rate of each user, so as to minimize the transmission power of the system. Simulation results show that in meeting the user’s rate requirements can achieve good system performance.