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the maximum likelihood detection
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     is maximum.
     的影响极大。
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     On the Maximum Mortgage
     试论最高额抵押
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     var. maximum Y.
     var. maximum Y.
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     ON THE MAXIMUM LEFT ANNIHILATORS
     关于极大左零化子
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     ON THE ESTIMATION OF MAXIMUM LIKELIHOOD SPECTRA
     关于最大似然谱估计
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  the maximum likelihood detection
This article presents first the generic structure and the formulation for the maximum likelihood detection of signals corrupted by intersymbol interference.
      
Finally, based on the voting result, the maximum likelihood detection and image relative pose estimation is achieved.
      


A correlator and a detection method are presented. The detection method is modified from "Appollo" ranging system and suitable specifically for tone-code mixed ranging system. In the "Appollo" system the maximum likelihood detection was used, while in the present detection method setting of detection threshold is float.In comparison with"Appollo"system it has obvio us advantages: cor-relation loss decreases by 6dB and configuration is very simple. These feat-ures have been proved in use.

本相关装置和浮动门限判决法是在“阿波罗”系统的基础上改制而成的。比较适用于音—码混合测距系统。与“阿波罗”系统比,相关损耗降低6dB。浮动门限判决法与“阿波罗”系统的最大似然法比较,结构极其简单,使用效果很好。

in this paper, the maximum-likelihood detection and its performance are studied for thesampled signal in all digital receivers of optical PPM communications. The algorithm of demodulation and itsupper bound of error probability are given for any pulse shape received. Especially, the suboptimum decisionalgorithm of maximum accumulate count is discussed with a view of easy implementation. The effects of variousfactors are investigated. These results are helpful to designing all digital...

in this paper, the maximum-likelihood detection and its performance are studied for thesampled signal in all digital receivers of optical PPM communications. The algorithm of demodulation and itsupper bound of error probability are given for any pulse shape received. Especially, the suboptimum decisionalgorithm of maximum accumulate count is discussed with a view of easy implementation. The effects of variousfactors are investigated. These results are helpful to designing all digital PPM receivers.

研究了光脉冲位置调制全数字接收机的取样信号的最大似然解调及其性能.对接收到的任意脉冲波形给出了解调算法和差错概率上界。以此为基础,对容易实现的最大累加计数判决算法,讨论了各种参数对其解调性能的影响,其结果对设计和实现全数字PPM接收机是有益的。

A new scheme of space-time spreading of complex signals based on the downlink of direct sequence code division multiple access (DS-CDMA) systems is presented. Using transmit diversity techniques, the new scheme combines the space-time block code (STBC) with spreading codes. Depending on the characteristic of complex signals and the dual orthogonality of STBC and spreading codes, the scheme can utilize the resources of space and time efficiently, and it transfers the maximum-likelihood detection...

A new scheme of space-time spreading of complex signals based on the downlink of direct sequence code division multiple access (DS-CDMA) systems is presented. Using transmit diversity techniques, the new scheme combines the space-time block code (STBC) with spreading codes. Depending on the characteristic of complex signals and the dual orthogonality of STBC and spreading codes, the scheme can utilize the resources of space and time efficiently, and it transfers the maximum-likelihood detection into a linear processing with a simplified decoding process to resolve the high complexity problem caused by the unorthogonality of the complex signal STBC. Over independent Rayleigh fading channels, this scheme can achieve the maximum possible diversity gain for a given number of transmit and receive antennas. Theoretical analysis and simulation results show that the proposed scheme outperforms the systems of transmit diversity without spreading and existing space-time spreading algorithms in terms of transmission rate, system capacity, bit error rate performance and implementation complexity.

基于直扩码分多址系统下行链路,提出了一种针对复信号的空时扩频算法.该算法采用发射分集技术,将空时分组编码与直接序列扩频相结合,依靠空时分组码和扩频码的双重正交特性以及复信号自身的特性,充分利用了空域和时域资源设计出新的收、发和解码算法,解决了复信号空时分组编码非正交所导致的解码复杂度过高的问题,将最大似然检测简化为一个线性过程.在独立瑞利衰落信道和给定收、发天线数的条件下,能够实现系统所能达到的最大的分集增益.理论分析及仿真结果表明,与未加扩频的发射分集系统及现有的空时扩频算法相比,该算法不仅能够显著提高数据传输速率,增大系统容量,还具有误码性能好,解码复杂度低、接收机结构简单等优点.

 
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