As wireless data applications over cellular networks become more widespread, the pressure to increase capacity will become even more intense. Capacity in the 800 and 900 MHz bands, where bandwidth is restricted, is al...As wireless data applications over cellular networks become more widespread, the pressure to increase capacity will become even more intense. Capacity in the 800 and 900 MHz bands, where bandwidth is restricted, is already becoming a limiting factor. This paper attempts to address how the application of smart antenna systems has brought about improvements in call quality and increased capacity through reduced Interference in Mobile Communication. The smart antenna may be in a variety of ways to improve the performance of a communications system. Perhaps most importantly is its capability to cancel co-channel interference. It helps in improving the system performance by increasing the channel capacity, spectrum efficiency, extending range coverage, speech quality, enabling tighter reuse of frequencies within a cellular network and economically, feasible increased signal gain, greater, reduced multipath reflection. It has been argued that Smart antennas and the Algorithms to control them are vital to a high-capacity communication system development.展开更多
在基于全球移动通信(global system for mobile communication,GSM)信号的外辐射源雷达中,不仅有能量很强的基站直达波和强多径干扰,同时还存在大量的弱干扰,单独利用自适应波束形成和低副瓣技术很难完全有效抑制所有的干扰信号。提出...在基于全球移动通信(global system for mobile communication,GSM)信号的外辐射源雷达中,不仅有能量很强的基站直达波和强多径干扰,同时还存在大量的弱干扰,单独利用自适应波束形成和低副瓣技术很难完全有效抑制所有的干扰信号。提出一种基于两步空域滤波的GSM辐射源雷达干扰抑制方法,首先利用低副瓣技术对弱干扰进行抑制,然后利用一种稳健的自适应波束形成方法对残留的强干扰信号作进一步抑制,计算机仿真结果验证了本文方法的有效性。展开更多
全球移动通信(Global System for Mobile communication,GSM)信号已经被很多文献证明可以作为外辐射源雷达的机会照射源信号,但是在以往的研究中主要考虑抑制主基站的直达波和多径干扰.而实际上,GSM辐射源雷达不仅受到主基站的干扰,还...全球移动通信(Global System for Mobile communication,GSM)信号已经被很多文献证明可以作为外辐射源雷达的机会照射源信号,但是在以往的研究中主要考虑抑制主基站的直达波和多径干扰.而实际上,GSM辐射源雷达不仅受到主基站的干扰,还受到其它同频基站的干扰.为了消除主基站干扰,同时抑制其它同频基站的干扰,本文提出首先利用扩展相消算法(Extensive Cancellation Algorithm,ECA)在时域上消除主基站的干扰,然后利用基于最差性能最优准则的稳健自适应波束形成在空域上对其它同频基站干扰进行抑制.最后仿真分析表明本文提出的杂波抑制方法的有效性.展开更多
文摘As wireless data applications over cellular networks become more widespread, the pressure to increase capacity will become even more intense. Capacity in the 800 and 900 MHz bands, where bandwidth is restricted, is already becoming a limiting factor. This paper attempts to address how the application of smart antenna systems has brought about improvements in call quality and increased capacity through reduced Interference in Mobile Communication. The smart antenna may be in a variety of ways to improve the performance of a communications system. Perhaps most importantly is its capability to cancel co-channel interference. It helps in improving the system performance by increasing the channel capacity, spectrum efficiency, extending range coverage, speech quality, enabling tighter reuse of frequencies within a cellular network and economically, feasible increased signal gain, greater, reduced multipath reflection. It has been argued that Smart antennas and the Algorithms to control them are vital to a high-capacity communication system development.
文摘在基于全球移动通信(global system for mobile communication,GSM)信号的外辐射源雷达中,不仅有能量很强的基站直达波和强多径干扰,同时还存在大量的弱干扰,单独利用自适应波束形成和低副瓣技术很难完全有效抑制所有的干扰信号。提出一种基于两步空域滤波的GSM辐射源雷达干扰抑制方法,首先利用低副瓣技术对弱干扰进行抑制,然后利用一种稳健的自适应波束形成方法对残留的强干扰信号作进一步抑制,计算机仿真结果验证了本文方法的有效性。
文摘全球移动通信(Global System for Mobile communication,GSM)信号已经被很多文献证明可以作为外辐射源雷达的机会照射源信号,但是在以往的研究中主要考虑抑制主基站的直达波和多径干扰.而实际上,GSM辐射源雷达不仅受到主基站的干扰,还受到其它同频基站的干扰.为了消除主基站干扰,同时抑制其它同频基站的干扰,本文提出首先利用扩展相消算法(Extensive Cancellation Algorithm,ECA)在时域上消除主基站的干扰,然后利用基于最差性能最优准则的稳健自适应波束形成在空域上对其它同频基站干扰进行抑制.最后仿真分析表明本文提出的杂波抑制方法的有效性.
