A novel class of algorithms for timing acquisition of differential transmitted reference UWB receivers: Architecture, performance analysis and system design
A novel class of algorithms for timing acquisition of differential transmitted reference UWB receivers: Architecture, performance analysis and system design
复制标题
DOI：
10.1109/twc.2008.070097
复制
发表时间：
2008-06-01
影响因子：
10.4
通讯作者：
Santucci, Fortunato
中科院分区：
文献类型：
--
作者：
Di Renzo, Marco;Annoni, Luca Alfredo;Santucci, Fortunato
分析了基于差分发射参考(DTR)接收机结构的脉冲无线电(IR)超宽带(UWB)系统的定时捕获(同步)过程。其基本贡献包括定时捕获分析的理论框架，它不仅能够描述捕获过程的一阶矩(平均捕获时间，MAT)和二阶矩(捕获时间的标准差)，而且还提供了对捕获时间的概率质量函数，即捕获时间质量概率的一致和全面的分析。具体而言，本文的创新之处在于：1)根据DTR接收机的具体特性和特点，提出了一种基于两步法的同步算法，并利用马尔可夫过程理论对其性能进行了分析；2)利用格子-泊松算法精确估计了捕获时间质量概率和总捕获概率(P-D((Ov)，即在给定时间之前同步的概率；Iii)关于捕获门限的一步解和两步解的性能分析和比较；以及iv)分析在多径衰落信道中估计MAT和P-D((OV))的两种方法，即TACQ平均和PD平均，这两种方法在不同的情况下会产生不同的结果。我们观察到，将分析限制在MAT上可能会导致对捕获阈值对DTR接收机设计的影响得出仓促的结论，从而证明需要使用P-D((OV))进行更一般的分析，以及D9为了准确的性能分析而指定无线信道的特性(例如，准静态、慢衰落或快衰落)的必要性。
This paper deals with the analysis of the timing acquisition (synchronization) process in Impulse Radio (IR-) Ultra Wide Band (UWB) systems based on Differential Transmitted Reference (DTR) receiver architectures. The fundamental contribution includes a theoretical framework for timing acquisition analysis, which is not only able to describe the first moment (Mean Acquisition Time, MAT), and the second moment (standard deviation of the acquisition time) of the acquisition process, but which also provides a consistent and comprehensive analysis of the probability mass function of the acquisition time, i.e., Acquisition Time Mass Probability. In particular, the specific novelty insights of this paper are as follows: i) the proposal of a new synchronization algorithm, which is based on a two-step approach and relies on the specific characteristics and peculiarities of DTR receivers, as well as the analysis of its performance via a framework based on the theory of Markov processes; ii) the exploitation of the LATTICE-POISSON algorithm to accurately estimate the Acquisition Time Mass Probability and Overall Acquisition Probability (P-D((ov))), i.e., the probability to get synchronized before a given time; iii) the performance analysis and comparison of one-step and two-step solutions with respect to the acquisition threshold; and iv) the analysis of two approaches to estimate MAT and P-D((ov)) in multipath fading channels, i.e., "Tacq Average" and "Pd Average', which are shown to lead to different results in different scenarios. We observe that restricting the analysis to the MAT may lead to hasty conclusions about the effect of the acquisition threshold on the design of DTR receivers, thus substantiating the need for a more general analysis using P-D((ov)), as well as D 9 the necessity of specifying the characteristics of the wireless channel (e.g., quasi-static, slowly- or fast-fading) for an accurate performance analysis.