大容量散射调制解调技术研究  

Research on Modulation and Demodulation Technologies of High Speed Troposcatter Communication

作　　者：高自新[1] 吴新华[1] 吴慧[2] 

机构地区：[1]中国电子科技集团公司第五十四研究所,河北石家庄050081 [2]石家庄信息工程职业学院,河北石家庄050081

出　　处：《无线电工程》2008年第6期61-64,共4页Radio Engineering

摘　　要：简要介绍了时域自适应判决均衡器的原理,并根据对流层散射传播特点,利用自适应均衡技术以提高散射系统的抗码间干扰能力。采用四重显分集加自适应均衡的接收技术不仅可以减小码间干扰,收集隐分集能量,而且与显分集结合能够平滑信道选择性深衰落以及空间平坦衰落,大大提高设备通信能力。详细论述了自适应均衡器的技术特点和检测技术原理,并给出了对流层散射自适应均衡解调器的实现方案和抗多径测试结果。The principle of the time domain adaptive equalizer is briefly introduced. In addition, based on the channel character of troposcatter,the equalizer is utilized to dispel the intersymbol interference. The receiving technologies of apparent diversity including four branches and adaptive equalizer, not only counteract the intersymbol interference and collect the energy of concealed diversities, but also reduce the channel deep fading and the space flat fading. Thus, the capability of equipment is largely enhanced. The character of the time domain adaptive equalizer and the principle of detection are described in detail. Also, the implementing scheme of the troposcatter adaptive equalizer demodulator and the test results in multi-path channel are given in this paper.

关 键 词：自适应判决反馈均衡 对流层散射 码间干扰 衰落 

分 类 号：TN926.4[电子电信—通信与信息系统]