本篇論文在之前學長所提出多輸入單輸出的架構上，推廣為多輸入多輸出系統。在之前的架構上，結合了多天線系統與分碼多工，在不影響用戶數的前提下，將不同的碼組分配至不同天線上，以區隔天線。為了擴展為多天線又不減少用戶數，在每支天線上的碼組並不直接正交，而是透過接收端將資料相加以克服干擾，但這樣的方法相當容易受到通道的干擾，不同天線所受到的不同增益會直接反應在相加結果，使得干擾不被消除。
於是，我們在碼組的設計上會避免這樣的問題，也就是在不犧牲用戶數的狀況下，盡可能地減少干擾發生。有關碼組的設計，在論文中先用通式找出符合哪些特性的碼是用於此系統，並分析碼矩陣的相關特性，接著再根據這樣的相關性限制，用正交矩陣產生出符合此系統的碼組。

We present a MIMO CDMA system by complete complementary codes without sacrificing bandwidth or number of users. Unlike other MIMO systems, we use time-spreading and frequency-spreading in each antenna. In other words, there are different spreading code matrices in different antennas. We first analyze the performance in multipath Rayleigh fading channel. Then, we discuss the codes which can satisfy this kind of system. To conserve the number of users, we do not directly distribute different complementary codes to each antennas. The method is to make the interferences be canceled after summation for some conditions. In order to not affected by different channel gains for different antennas, the codes will be as orthogonal as possible. Just for some multipath delay, it need summation to cancel the interference.

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