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中文摘要：
分析了信道估计误差和信道反馈时延对采用迫零波束成形空分多址（SDMA）系统性能的影响．为降低信道不完美的影响，提出了动态白适应调制方案．该方案根据接收端的反馈信息动态地调整不同调制方式对应的信号干扰噪声比（SINR）门限，直到所有数据被正确接收为止．在不增加系统信令开销和不改变原有系统参数（如调制阶数和门限）的情况下，充分利用确认／非确认（ACK／NACK）信息可有效抑制信道估计误差带来的影响．
英文摘要：
The effect on the received signal to interference plus noise ratio （SINR） of spatial division multiple access （SDMA） systems with zero-forcing beamforming due to the channel estimation error and feedback delay is investigated. To reduce the negative effect of channel estimation error, a dynamic adaptive modulation scheme is proposed. This scheme dynamically adjusts the SINR thresholds for different modulation orders according to the feedbacks information from the receiver until the all the data are received correctly. Without increasing the signaling load and modifying original system parameters （e. g. , modulation order and threshold）, it can be easily extended to the cross-layer design existing channel esti-mation error.
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