一种基于基站协同的波束形成算法

将MIMO和波束形成相结合，可以有效地消除用户间的干扰，在多小区环境下，用户还受到来自小区内的同频干扰（CCI）。针对小区用户受到的CCI，改进了基于信号漏损比的波束形成算法，将其应用于多小区环境。该算法考虑小区内用户所受同频干扰影响的差异，根据用户信号功率、漏损给本小区内用户的干扰功率和临近小区用户的干扰功率重新定义信号漏损比。按照用户信号漏损比最大化的原则，利用基站协同，多小区联合选择波束形成矢量，并对该算法在不同条件下进行了仿真分析，结果表明该算法降低了多小区覆盖的用户的误比特率。

A beamforming algorithm based on base station cooperation

The beanforming with MIMO can effectively eliminate the interferences between users. Under the environment of multi-cell, the users are suffered from the co-channel interference. Hence, a beamforming algorithm based on signal and leakage ratio was improved for multi-cell system and applied to multi-cell. This algorithm considers the difference between interferences suffered by users who were covered by multi-cell. According to user's signal power and leakage power, the algorithm redefined the signal and leakage ratio. With the base-station cooperation, maximizing the signal-to-leakage ratio was used to design transmit beamforming vectors, and then the algorithm was simulated under different conditions. Simulation result shows that the algorithm reduces the bit error rate of the users covered by multi cell.