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多流波束赋形技术是LTE-Advanced中采用的多天线增强技术。采用单用户多流波束赋形技术,可以使得单个用户在某一时刻可以进行多个数据流传输,在提升系统性能上表现出极大优势。提出一种LTE-Advanced中下行单用户自适应多流波束赋形算法,基站端基于接收模型对下行链路容量进行预估计,在一定信噪比要求的条件下,以信道容量最大化准则选择波束赋形流数。仿真结果表明,自适应算法增加了波束赋形系统的灵活性,能够有效提高LTE-Advanced系统中下行链路性能。
Multi-stream beamforming is a multi-antenna enhancement technique used in LTE-Advanced. With single-user multi-stream beamforming technology, a single user can transmit multiple data streams at a time, which shows great advantages in improving system performance. An LTE-Advanced single-user adaptive multi-stream beamforming algorithm is proposed in LTE-Advanced. The base station estimates the downlink capacity based on the receiving model, and chooses the channel capacity maximization criterion under certain SNR requirements Beamforming flow number. The simulation results show that the adaptive algorithm increases the flexibility of the beamforming system and can effectively improve the downlink performance in the LTE-Advanced system.