大规模多天线系统中一种导频联合调度方案设计

Design of pilot joint assigning scheme for massive multi-antenna system

导频污染严重制约了大规模多天线系统技术的进步,如何抑制大规模多天线系统中的导频污染成为了研究的热点。在基于时移导频调度的基础上,提出了一种结合频率部分复用技术的导频联合调度策略。该策略首先将小区分为若干组,在其中一组接收导频的同时,其他组进行下行链路的信息传输,然后再利用部分频率复用技术将系统带宽分为若干个子载波,在同一组各个小区的边界区域分别以正交分配方式分配不同的子载波,因此在同一组内小区边界用户收到的干扰源数量会大大降低,从而达到抑制导频污染的目的。仿真结果表明,该联合调度策略有效地降低系统的误码率。

Pilot pollution has seriously restricted the technology development of massive multi-antenna system, and how to suppress the pilot pollution has become a hot research topic. This thesis introduces two pilot assigning schemes, which are based on the user location and time division, then, this thesis combines factional frequency reuse technology with the later, and gives a new pilot assigning scheme. This scheme will divide all cells into several groups, and when the cells in one group are receiving up link information, the other groups are transmitting down- link information at the same time, then, all the cells in one group will be assigned with different subearriers by fractional frequency reuse tech- nology. Because all the subcarrier are transmitted orthogonally, the users in boundary area in one cell can only suffer with the pilot contamination from another users who use the same subearrier, by this way, pilot contamination can be mitigated to a large extent. The simulation results confirms that the bit error rate and data transmission rate has improved obviously by the new pilot assigning scheme.