所以为了提高小区边缘用户的传输性能，提出了多小区协作的概念。
Therefore, the multiple cells coordination is present to promote the performance of cell-edge users by coordinating.
波束赋形作为一种下行传输模式，在消除小区间干扰与提高小区边缘用户性能方面发挥了巨大作用。
As a downlink transmission mode, beamforming plays a major role in the elimination of inter-cell interference and performance improvement of cell edge users.
提供了一种提高蜂窝OFDMA小区边缘用户上行链路传输效率的方法，它利用小区内扇区分集提高误比特率性能，并利用小区间分组分集降低分组重传次数。
A method to improve transmission efficiency at the edge of cellular OFDMA uplink is proposed, decreasing bit errors by sectors diversity and reducing the number of retransmission.
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