This paper researches the integrating application of adaptive antenna array technology , spread - spectrum communication technology and transform - domain filter technology in shortwave communication area , basing on the background of improving on the shortwave communication equipments being used in chinese army , and all the key techniques mentioned above are implemented in a single fpga chip 本文以改造我军现役短波通信设备为背景,研究了自适应天线阵技术、扩频通信技术、变换域滤波技术等多种现代数字信号处理技术在短波通信中的综合应用,并以单片超大规模fpga芯片为硬件处理平台,对系统中的关键技术进行了设计与实现。
The direction of arrival and time of arrival statistic for circular and elliptical vector channel model are derived , and efficient methods are give that can be used to simulate these models . the benefits of using adaptive antennas are also studied for 3g mobile radio system based on td - scdma . hi this thesis , these benefits are explained theoretically and illustrated by computer simulation 然后用矩量法和等效网络方法分析了自适应阵列的互耦特性，建立了考虑互耦后的阵列信号接收模型，考察了计入互耦后music来波估计算法性能，并给出了一种基于music算法的互耦矩阵求解方法。
But because of complex processing , larger computation , lower convergence speed and even error convergence in some instance , the existed adaptive criterion and algorithm is difficultly tracking the user real - timely . adaptive algorithm is the bottle - neck of smart antenna , resulting in adaptive antenna ca n ' t be achieved fully adaptive aims in practice and only studied in theory 主要原因是目前提出的各种自适应准则和算法过程复杂、计算量大、收敛速度慢，很难实时跟踪用户，致使全自适应天线目前只局限于理论探讨，而不能从实际应用中实现全自适应的目的。
This paper begins with an overview of the fundamentals of adaptive antennas . the correspondence between a spatial filter and the fir filter is illustrated , and the spatial filter characteristic of adaptive antennas is investigated by dmi and ls - drmtcma algorithms . the discrete - time transmission model of synchronous cdma systems with antenna arrays is also developed 本文首先对自适应天线的基本原理进行了简要介绍，建立了阵列接收的同步cdma系统离散时间传播模型，并论述了空域滤波和时域fir滤波器的类比性，用dmi和ls ? drmtcam算法仿真了自适应天线空间滤波性能。
Additionally , the mutual coupling characteristic of adaptive antennas is analyzed by mom and equivalent network method , and the data model is built considering the mutual coupling of antennas arrays . the effect of mutual coupling on music algorithm is also studied , and we get a method to find the mutual coupling matrix based on music algorithm . finally , the effects of mutual coupling and rf channel imbalances on td - scdma are investigated , which will provide a reference for system design 最后在矢量信道模型分析基础上，深入地研究了td ? scdma系统中自适应天线与联合检测相结合技术，从系统矩阵和误码率仿真两方面考察了自适应天线对联合检测性能的改善，并分析了阵列互耦和射频通道校准误差对td ? scdma系统上行性能的影响，为系统设计提供了依据。
