本文针对上行链路任意分配子载波重点研究了载波频偏估计和多用户间干扰消除的方法。

This paper focuses on carrier frequency offset estimation (CFO) and multiuser interference elimination in uplink OFDMA system based on generalized carrier assignment schemes.

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在该方案中，接收端进行波束成形，发送端通过TH预编码进行用户间干扰抑制，同时采用层间轮换的用户调度机制。

In this scheme, the receivers perform beam-forming, while the transmitter suppresses the inter-user interference using the THP scheme.

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在上行链路中每个用户由于载波频率偏差而存在潜在的不同步，这样使子载波之间失去正交性，从而在基站接收端产生多用户间干扰。

However in uplink channel, each user has its own frequency offset which leads to a loss of orthogonality among the sub-carriers and multiuser interference at the base station receiver.

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