中文摘要：

首先利用一种空时分集结构提出一种多入多出超宽带系统收发信机模型，并给出相应的信号检测方法。然后，利用脉位调制信号结构导致的接收信号一阶统计量循环平稳特性，提出一种适用于系统且没有估计模糊度问题的低复杂度盲信道估计方法。仿真结果表明，提出的盲信道估计方法由于复杂度低且没有估计模糊度，给接收机的信号检测提供了准确的信道状态信息。提出的超宽带多入多出系统由于获得了时间分集和空间分集，不论在完美信道下还是估计信道下均明显优于传统单天线系统。

英文摘要：

Firstly, a transceiver of UWB systems with multiple antennas is proposed by employing the special space-time diversity structure, where the corresponding detection algorithm is also presented. Then, by exploiting the first-order cyclostationarity in the received signals incurred by the pulse-position modulation format, a low complexity blind channel estimation method without estimation ambiguity is proposed for the UWB system with space-time diversity. Simulations demonstrate that the proposed blind channel estimation method can provide the accurate channel state information for the signal detection. Moreover, since both time diversity and space diversity are obtained, the proposed UWB system with multiple antennas significantly outperforms the conventional UWB system with the single antenna not only in the perfect channel but also in the estimated channel.