单载波频域均衡系统中一种简化的IBDFE算法

发布时间：2018-04-03 05:10

本文选题：单载波频域均衡　切入点：判决反馈均衡　出处：《电子学报》2014年09期

【摘要】：在单载波频域均衡系统中,线性均衡算法虽然简单易行,但是其抑制噪声干扰和符号间干扰的能力有限,因此需要引入非线性的反馈和迭代机制以进一步提升系统性能.迭代块判决反馈均衡(Iterative Block Decision Feedback Equalization,IBDFE)就是一种行之有效的非线性算法,但其缺点是计算复杂度高.鉴于此,在IBDFE结构的基础上,利用最小均方误差准则,推导出了一种新的简化算法.之后,对简化后算法和现有低复杂度算法的均方误差(Mean Square Error,MSE)性能进行了理论分析和比较,并在两种无线多径衰落信道下对三种不同的算法进行了仿真.结果表明,在所给信道条件下,这种算法在迭代两次后已基本收敛.同时,仿真也验证了MSE分析的结论.最后,对算法复杂度的分析和比较表明,提出的简化算法相比传统IBDFE算法,其误比特率性能有所下降,但能有效地减小计算量.
[Abstract]:In single-carrier frequency-domain equalization systems, the linear equalization algorithm is simple and feasible, but its ability to suppress noise interference and inter-symbol interference is limited. Therefore, nonlinear feedback and iterative mechanisms need to be introduced to further improve the performance of the system.Iterative Block Decision Feedback equalization (IBDFE) is an effective nonlinear algorithm, but its disadvantage is high computational complexity.In view of this, based on the IBDFE structure, a new simplified algorithm is derived by using the minimum mean square error criterion.Then, the mean square error mean Square error (MSE) performance of the simplified algorithm and the existing low complexity algorithm is analyzed and compared theoretically, and three different algorithms are simulated in two wireless multipath fading channels.The results show that under the given channel conditions, the algorithm has basically converged after two iterations.At the same time, the simulation also verifies the conclusion of MSE analysis.Finally, the complexity of the proposed algorithm is analyzed and compared with the traditional IBDFE algorithm, the BER performance of the proposed simplified algorithm is reduced, but the computational complexity can be effectively reduced.
【作者单位】：武汉船舶通信研究所;
【分类号】：TN911.5

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