本文为瑞典隆德大学（作者：Ningxin Chen）的硕士论文，共51页。

本文主要研究多用户多输入多输出（MU-MIMO）系统的无线基站（BS）中多扇区协作的优点。性能评估是在2.65GHz的载波频率下，在城市宏蜂窝环境中使用站点内协调多点（CoMP）信道测量进行的。分析的重点是研究多址信道（MAC）和广播信道（BC）在单个基站中通过三扇区协作实现的MU-MIMO容量增益。为了简化计算复杂度，我们研究了两个用户场景。为了计算和速率容量，在MAC情况下假设采用联合解码。由于在BC情况下发射协方差矩阵的最大化和噪声相关矩阵的最小化，应用MAC和BC之间的上行链路下行链路对偶来获得BC情况下的容量。结果表明，在MAC和BC中，三扇区协作引入的MU-MIMO容量增益中值分别约为30%和80%。在中断性能方面，10%的测量位置在MAC和BC中的容量增益分别超过65%和110%。此外，当一个用户被固定在每个扇区的中心时，另一个用户移动到扇区的后部，容量增益是最大的。另一方面，当一个用户固定在相邻两个扇区的边缘时，另一个用户移动到第三个扇区的覆盖区域时，容量可以大大提高。在MAC和BC示例中都可以得到相同的结论。综上所述，在站点内CoMP系统中使用多扇区协作对于提高MUMIMO系统的容量性能具有很大的潜力。

This master thesis mainly studies thebenefits of multi-sector cooperation in the radio base station (BS) of a multi-usermultiple-input multiple-output (MU-MIMO) system. The performance evaluation isperformed using intrasite coordinated multi-point (CoMP) channel measurementsin an urban macrocellular environment at the carrier frequency of 2.65 GHz. Thefocus of the analysis is to investigate the MU-MIMO capacity gain enabled bythree-sector cooperation in a single BS site for both multiple access channel(MAC) and broadcast channel (BC). To simplify the complexity of thecalculation, we study the two-user scenario. To calculate the sum ratecapacity, joint decoding is assumed in the MAC case. Due to the complexity inthe maximization of the transmit covariance matrix and the minimization of thenoise correlation matrix in the BC case, uplinkdownlink duality between MAC andBC is applied to obtain the capacity in the BC case. The results show that themedian MU-MIMO capacity gain introduced by the three-sector cooperation isabout 30% and 80% in MAC and BC, respectively. When it comes to the outageperformance, 10% of the measured positions have capacity gains of over 65% and110%, in MAC and BC, respectively. Furthermore, when one user is fixed at thecenter of each sector, the capacity gain is maximum when the other user movesto the back lobe of the sector. On the other hand, when one user is fixed atthe edge of two neighboring sectors, the capacity can be greatly improved whenthe other user moves into the coverage area of the third sector. The sameconclusions can be obtained in both MAC and BC cases. To summarize, usingmulti-sector cooperation in an intrasite CoMP system exhibits great potentialfor improving the capacity performance in MUMIMO systems.

1. 引言

2. 测量设置

3. MU-MIMO容量

4. 上行链路结果与分析

5. 下行链路结果与分析

6. 结论

7. 未来工作展望

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