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首页> 外文期刊>IEEE Transactions on Vehicular Technology >Suboptimal Search Algorithm in Conjunction With Polynomial-Expanded Linear Multiuser Detector for FDD WCDMA Mobile Uplink
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Suboptimal Search Algorithm in Conjunction With Polynomial-Expanded Linear Multiuser Detector for FDD WCDMA Mobile Uplink

机译：FDD WCDMA移动上行链路与多项式扩展线性多用户检测器结合的次优搜索算法

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摘要

A suboptimum search algorithm that considers the users'' power profile in conjunction with a primary stage of polynomial-expanded (PE) linear multiuser detector for mobile uplink is proposed to suppress interference level. The initial stage is improved by mathematical analysis using two new ideas based on the Rayleigh-Ritz and Gershgorin theorems for both synchronous and asynchronous users. The performance of the PE structure is further enhanced by a new suboptimum search algorithm as the second stage. The structure of the search algorithm is based on starting from a point close to the optimum search and performing sequential steps to modify it. The proposed structures of the PE method and the suboptimum search algorithm are well suited together and make them collaboratively work without encountering a high level of complexity, since they use similar information as the correlation matrix. The power profile of the users is also considered in the suboptimum search algorithm, which led to more than a 50% reduction of the complexity, while keeping the performance almost the same. The performance of the final structure is carried out by means of computer simulations, and it has been compared to a partial parallel interference cancellation method with optimized partial coefficients. One of the main features of the structure proposed in this paper is that it performs its operations on the canonical formulation of the system, which makes it highly suitable for a broad range of systems such as multicarrier code division multiple access and multiinput multioutput.
机译：为了抑制干扰，提出了一种考虑用户功率分布并结合多项式扩展（PE）线性多用户检测器用于移动上行链路的初级优化算法。通过使用基于Rayleigh-Ritz和Gershgorin定理的两个新思想对同步和异步用户进行数学分析，改进了初始阶段。作为第二阶段，通过新的次优搜索算法进一步提高了PE结构的性能。搜索算法的结构基于从接近最佳搜索的点开始并执行顺序步骤对其进行修改。 PE方法和次优搜索算法的拟议结构非常适合在一起，并且使它们可以协同工作而不会遇到很高的复杂度，因为它们使用相似的信息作为相关矩阵。在次优搜索算法中还考虑了用户的电源配置文件，从而使复杂度降低了50％以上，同时保持了几乎相同的性能。最终结构的性能是通过计算机模拟实现的，并且已与具有优化局部系数的局部并行干扰消除方法进行了比较。本文提出的结构的主要特征之一是，它按照系统的规范公式执行其操作，这使其非常适合广泛的系统，例如多载波码分多址和多输入多输出。

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