Firstly , the strongest interference is estimated and cancelled . then interference estimation and cancellation is implemented again in the next iteration . through the iterative processing , multiple - tone interference is removed 该方法采用排序干扰检测的方式重建干扰,然后进行干扰对消,接着将对消后的信号再排序干扰检测、再对消,通过这样的迭代过程抑制多音干扰。
The psychoacoustics and physiology of human beings are the theoretical foundation of virtual sound location research . human ’ s auditory system structure and auditory characteristics are introduced in this paper . these are research foundation for this paper 人类听觉生理学和心理学是研究虚拟声定位技术的基础,本论文回顾了心理声学相关听觉系统以及听觉特性,包括音频定位因素的影响和哈斯效应,掩蔽效应等因素对多音叠加的影响,为本文奠定了研究基础。
Mtcem ( multi - tone envelope method ) can accurately forecast performance parameters on a set of stored channel and directly decide usable frequency choice . as hf channel characteristic is closed to gauss , mtcem may be simplified to multi - tone envelope method rtce system . for certain user ' s request and link status , double tone complex envelope method rtce , double tone envelope rtce , adaptive hf channel sounding and communication system , all that can easily derived from mtcem 多音复包络实时选频系统，当信道特性近似于高斯信道时，整个系统可以简化为多音包络法实时选频系统，针对不同的用户要求和电路信道状况，很容易由它派生出较为简单的系统，如双音复包络法实时选频系统，双音包络法实时选频系统，短波自适应信道探测和通信系统。
The signal format of gps is analyzed , the principle models and mathematical models are established , the ber performance is analyzed in a channel interfered with wide - bandwidth awgn , narrow - bandwidth awgn , transmitted signal , single - tone signal respectively . based on the results above interference methods are discussed and simulated . then the performance of code acquisition and code trace of a digital gps receiver are discussed . the modem of linkl 1 and link4a are modeled and their ber performances are analyzed and simulated in channel s interfered with awgn , single - tone signal and multi - tone signal respectively 建立了jtids的收发终端的数学模型，分析它在噪声干扰、相关干扰、互相关干扰下的误码性能，提出较佳的干扰方法和干扰码型，并进行仿真模拟；分析了gps的信号格式，建立了gps的原理框图模型、信号数学模型，并对其在宽带噪声干扰、窄带噪声干扰、转发干扰、单频干扰等情形下的误码性能进行了分析比较，提出相对较佳的干扰方法，并做了计算机模拟，针对一数字式gps接收机中扩频码捕获与跟踪环的特性进行分析；建立了link11和link4a数据链调制解调数学模型，对它们在噪声干扰、单音干扰、多音干扰等下的误码性能进行分析，最后对干扰情况进行了仿真模拟。
This thesis adopts 8psk / qpsk modulation mode that ' s widely applied in short - wave communication to research all - digital blind receiver in burst mode based on software radio technology . then related solutions are given for the doppler frequency shift problem and multiple fading problem in short - wave channels . the arrangement of the thesis is below : chapter 1 gives brief description for the new technology and new systems of short - wave communication and for the development and appliance of software radio 本文采用短波通信中应用广泛的8psk qpsk调制方式，研究基于软件无线电技术的突发模式全数字盲接收机，并对多音并行及慢速传输中存在的多谱勒大频偏问题、单音串行、高速数传时在短波通信链路中发生的干涉衰落问题做了研究，提出了相应的解决方案。
Thus , the frequency domain adaptive filter is well suited to a multi - narrowband interference scenario , the paper studied frequency domain adaptive algorithms , carried out analysis and computer simulations . simulation results : for gold codes ds - ss signal of length 63 , 4 interferences of signal to interference ratio ( sir ) 40 ub or 4 narrowband interferences of signal to interference ratio ( sir ) 40 db and frequency - spectrum bandwidth 12 percent of the whole bandwidth , the sir improvement is better than 20db 仿真结果指出，在输入信号为干扰是4个等强度的多音干扰或4个频谱带宽占信号总带宽12的强窄带干扰(干信比为40db )的扩频信号(码长为63的gold码序列)情况下，算法的干扰抑制比均优于20db 。
