自适应天线

• Focused on resolving this problem , a new mac protocol dedicated to well utilize the advances of adaptive antenna array ( a type of smart antenna ) is proposed
  三、为了解决上述问题,本文设计了一种新的旨在进一步挖掘自适应天线阵(智能天线的一种)优点的mac协议。
• The increasing demand for capacity and quality motivates the need for new techniques to improve spectrum utilization . the use of adaptive antennas is one area that shows promise for increasing spectrum efficiency
  随着移动通信的飞速发展，自适应天线作为一种有效提高频谱利用率的技术正受到广泛的研究。
• It is one of advanced technologies used in modern radar that applying adaptive algorithms to radiation pattern of an adaptive array in order to control nulls of the beam pattern and to suppress interferential signals
  在自适应天线阵的发射模式中应用自适应算法，控制发射波束的零点位置，以达到抑制干扰信号的目的，是现代雷达采用的先进技术之一。
• Adaptive antenna array technology based on lms ( least mean square ) algorithm is discussed . and lms algorithm based on floating point format in implemented successfully using the high - performance structure and the new floating point format
  阐述了基于lms算法的自适应天线阵技术,基于论文提出的高效结构及浮点格式在fpga上成功实现了浮点lms算法。
• Chapter 2 embodies smart antenna technique . two types of smart antenna are introduced : beam - switched system and adaptive antenna system . then the spatial processor is discussed . some classical optimization beamforming schemes and adaptive algorithms are also presented
  第二章具体介绍了智能天线技术，包括两种类型的智能天线：切换波束系统和自适应天线系统。
• Digital signal processing technologies were used to produce spatial and directional beam in adaptive antenna . then the main beam aims at the coming direction of desired signal and the side lobe points to the coming direction of interference signals
  自适应天线利用数字信号处理技术，产生空间定向波束，使天线主波束对准期望信号到达方向，旁瓣或零陷对准干扰信号到达方向。
• The combination of adaptive antenna with frequency - hopping technique can improve the interference - resist ability . this thesis studies the key technologies of using adaptive beamformer to suppress the fast follower and the wide - band interference , mainly including two aspects
  因此，在跳频系统中使用自适应天线技术，可将信号、干扰在空?频域分离，进一步提高跳频系统的抗干扰性能。
• This thesis investigates the application and implementation of adaptive array based on mmse criteria in the presence of strong man - made interferences and aperiodic spread spectrum codes , including reference signal generating , afc in adaptive antennas array , and an application of adaptive antennas for a general non - spread spectrum signal , ssb ( single sideband ) communication system is presented . the thesis is outlined as follows
  论文研究了在强人为干扰和非周期扩频码情况下，基于mmse准则的扩频系统自适应天线阵的实现和应用问题，包括参考信号提取、自适应天线阵中的afc ，并给出了在非扩频信号单边带ssb ( singlesideband )信号通信系统中的自适应天线的应用。
• 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。
• 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。