准静态信道下多天线单载波频域均衡技术研究

发布时间：2018-03-22 20:16

本文选题：单载波频域均衡　切入点：块迭代判决反馈　出处：《电子科技大学》2014年硕士论文　论文类型：学位论文

【摘要】：单载波频域均衡(SC-FDE)是解决符号间干扰(ISI)问题的一项重要技术。相比于单载波时域均衡(SC-TDE)技术和正交频分复用(OFDM)技术,SC-FDE技术具有复杂度低、峰均功率比小的优点。但是,SC-FDE技术中,均衡算法的性能与复杂度存在制约关系,传统均衡算法无法在二者之间取得较好的折衷。针对这一问题,论文研究了一类被称作块迭代判决反馈均衡(IB-DFE)的均衡算法。该算法能够在提高误码性能的同时,保持较低复杂度。论文在IB-DFE算法基础上进行了改进,并对结合空间分集技术的多天线IB-DFE算法及其改进算法进行了研究。具体研究内容如下:首先,分别对两种IB-DFE算法:HD-IBDFE算法和SD-IBDFE算法,进行了理论推导,复杂度分析与性能仿真。仿真结果表明:误码率(BER)为310?时,相比于传统的MMSE算法,HD-IBDFE算法和SD-IBDFE算法分别能够带来约3.0d B和3.5dB的误码性能提升。其次,对IB-DFE算法进行了改进。在SD-IBDFE算法基础上,引入能量扩展变换(EST)技术,得到一种改进算法:EST+SD-IBDFE算法。仿真结果表明:3BER 10??时,相比于SD-IBDFE算法,EST+SD-IBDFE算法能够带来约0.5dB的误码性能提升。最后,分别对多天线SD-IBDFE算法和多天线EST+SD-IBDFE算法的实现结构与误码性能进行了研究。仿真结果表明:3BER 10??时,相比于1发1收场景,SD-IBDFE算法和EST+SD-IBDFE算法在1发2收场景下的误码性能分别提高约5.0dB和4.6dB,在2发1收场景下的误码性能分别提高约1.4dB和1.0dB,2发2收场景下的误码性能分别提高约5.5dB和5.0dB。论文研究结果表明,无论在单天线场景,还是在多天线场景下,EST+SD-IBDFE算法都能带来误码性能的提升。但天线数的增加会减小EST+SD-IBDFE算法性能提升的幅度。论文工作可以为高性能低复杂度SC-FDE技术的研究提供参考。
[Abstract]:Single carrier frequency domain equalization (SC-FDE) is an important technique to solve the ISI problem. Compared with single carrier time domain equalization (SC-TDE) and orthogonal frequency division multiplexing (OFDM) technique, SC-FDE has the advantages of low complexity and low peak-to-average power ratio (PAPR). The performance of equalization algorithm is restricted by its complexity, and the traditional equalization algorithm can not achieve a better compromise between them. This paper studies a class of equalization algorithms called block iterative decision feedback equalization (IB-DFEE). This algorithm can improve the performance of BER and keep the complexity low. This paper improves the algorithm based on IB-DFE algorithm. And the multi-antenna IB-DFE algorithm combined with spatial diversity and its improved algorithm are studied. The specific research contents are as follows: firstly, two kinds of IB-DFE algorithms, namely, the IB-DFE algorithm: HD-IBDFE algorithm and the SD-IBDFE algorithm, are derived theoretically, respectively. Complexity analysis and performance simulation. Simulation results show that BER is 310? Compared with the traditional MMSE algorithm, the HD-IBDFE algorithm and the SD-IBDFE algorithm can improve the error performance of about 3.0 dB and 3.5dB respectively. Secondly, the IB-DFE algorithm is improved. Based on the SD-IBDFE algorithm, the energy expansion transform (est) technique is introduced. An improved algorithm called: est SD-IBDFE algorithm is obtained. The simulation results show that: 3BER10? ? Compared with the SD-IBDFE algorithm, the est SD-IBDFE algorithm can improve the BER performance of the approximate 0.5dB. Finally, the implementation structure and the BER performance of the multi-antenna SD-IBDFE algorithm and the multi-antenna EST SD-IBDFE algorithm are studied respectively. The simulation results show that: 3BER10? ? When, The BER performance of SD-IBDFE algorithm and EST SD-IBDFE algorithm is improved by about 5.0dB and 4.6 dB, respectively, compared with that of SD-IBDFE algorithm and EST SD-IBDFE algorithm in 1 transmit and 1 receive scenario, and the BER performance under about 1.4dB and 1.0 dB / 2 receiver scenario is improved in 2 transmit and 1 receive scenarios, respectively. The BER performance of SD-IBDFE algorithm and EST SD-IBDFE algorithm in 1 transmit and 2 receive scenario is improved by 4. 6 dB and 4. 6 dB, respectively. About 5.5dB and 5.0 dB were increased, respectively. The results show that, Whether in a single antenna scene, However, the increase of the number of antennas will reduce the range of performance improvement of EST SD-IBDFE algorithm. This paper can provide a reference for the research of high performance and low complexity SC-FDE technology.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN911.5

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