大型多輸入多輸出系統在通訊學術界上是項最近被討論很熱烈的一項技術，大型多輸入多輸出系統使用很大數目的傳送天線來傳送訊號給接收端，造成資料傳輸量以及錯誤率比起傳統的多輸入多輸出系統在短距離的通訊傳送環境下有更好的表現。若要使用大型多輸入多輸出系統，在基地台端若要設置大量的天線當作傳送用的天線，必須要有大量的空間來擺設。本論文使用2維的平面天線陣列的系統來傳輸訊號使得基地台的空間使用效率較高。另外因為使用大量的天線數目，使得射頻電路的複雜度也隨之增加。
為了降低電路硬體的複雜度，本篇論文提出兩種可能方法，第一種是在預編碼之前選擇傳輸天線來降低天線的使用量，第二種是使用混訊預編碼的訊號處理來達到降低電路的複雜度。本論文除了分析天線選擇技術所造成的影響以及毫米波通道模型的特性以外，也提出新的射頻/基頻預編碼處理演算法，比起一些其他相關演算法更能減少一點運算的複雜度、增加硬體的平行度，更重要的是能大量縮小之後硬體實現的大小。射頻/基頻預編碼處理演算法是在使用TSMC based cell 的製程條件下提出。此新的射頻/基頻預編碼處理適用於16x8二維天線陣列多輸入多輸出系統，能夠支援一到四個資料串的傳輸模式。

Massive MIMO systems are popularly discussed among ICTs academic members presently.
The systems applied a large numbers of transmitted antennas to transmit signals to receiver
which had improved data rate and error rate. The systems proved to work out
better than traditional MIMO systems in short-distance transmission. To apply the
Massive MIMO systems, the Base station must installs a lot of antennas and the installment
costs spaces. In this paper, I would like to introduce a 2 dimensional planar
antenna array to improve space eciency. Moreover, the applying of large numbers of
antennas has hiked the complexity of radio frequency chains. To reduce the complexity
of hardware, it has 2 possible methods to solve this problem, one of them is using
the antenna selection before the signal precoding process to lower the number of used
antennas, and another method is using the hybrid precoding process to decrease the
complexity of the precoding circuit. In this thesis, we are not only analyzed the eect
of the antenna selection and the property of millimeter wave channel model, but also
proposed a new modication algorithm of joint RF and baseband precoding scheme.
Comparing the other algorithms which are relative with the joint RF and baseband
precoding scheme, the new algorithm is able to reduce the computational complexity
and increase the high parallelism hardware architecture. Moreover, it can signicantly
reduce the area of hardware implementation. The proposed algorithm of precoding for
16x8 two dimensional planar antenna array MIMO systems can supposes in four-, three-,
two-, and one-stream modes, respectively.

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