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提出了一种MIM0系统中低复杂度的局域化最大似然信号检测算法,该方法通过调整信号有效搜索域大小,在计算复杂度与系统性能之间折衷.实验结果表明:该信号检测算法明显降低了高阶QAM调制的计算复杂度,在QPSK和16QAM调制时,当系统性能接近最大似然算法时计算量仅为其很小一部分。 相似文献
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为了降低系统光多输入多输出(MIMO)系统的复杂度,提高系统的性能,介绍了迫零(ZF)检测算法、最小均方误差(MMSE)检测算法、最大似然(ML)检测算法在垂直分层空时编码(V-BLAST)光MIMO空时系统中的应用。从理论上对算法性能和复杂度进行研究,然后在MATLAB建立仿真模型,对多模光纤的传输函数进行仿真,结果表明在多模光纤链路中,ZF算法性能较低;MMSE算法较ZF算法有所改进;ML算法通过比较接收符号和原发送的符号之间的相似度,从而获得原符号的最小差错概率,其性能最好。 相似文献
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针对多输入多输出(MIMO)通信系统中球形译码检测算法在较低信噪比和较高的调制阶数时复杂度仍然很高的问题,提出一种不影响检测性能同时又能大大降低其复杂度的方案。首先,对传统的球形译码算法进行研究;其次,介绍改进的球形译码算法;最后,通过仿真结果对其进行验证。 相似文献
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一种低复杂度的MMSE-QRD-QRDM检测方法被提出,该算法根据接收端各子流的信干噪比(SINR)和门限值的比较,对各子流分别进行最小均方误差QR分解(MMSE-QRD)检测或QR分解-M(QRD-M)检测。对MMSE-QRD-QRDM算法进行了误码率(BER)性能仿真和算法复杂度分析。结果表明,和OSD-MLD算法相比,MMSE-QRD-QRDM算法可以在大大降低检测算法复杂度的情况下,获得优于OSD-MLD算法的BER性能,同时通过减少运算中的矩阵求逆次数,提高了算法的数值稳定性。 相似文献
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文中对MIMO系统中各种基于MMSE准则的接收算法,包括线性MMSE算法、MMSE-BLAST以及MMSE-SQRD算法,对检测后系统容量带来的影响做了详细的分析与推导,给出了其具体表达式,并用计算机仿真给予验证,得出了MMSE-SQRD算法的检测后系统容量最好的结论。 相似文献
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《电子与封装》2017,(6):31-35
用FPGA实现了多种垂直分层空时码(Vertical-Bell Laboratories Layered Space-Time,V-BLAST)检测算法,包括最大似然(Maximum Likelihood,ML)检测算法、破零(Zero Forcing,ZF)检测算法和最小均方误差(Minimum Mean Square Error,MMSE)检测算法。首先研究了MIMO V-BLAST系统架构、数学模型和多种接收机检测算法,分析了关键检测算法的特性和性能,重点使用Verilog硬件描述语言在Xilinx的Vertex4-VC4VSX55 FPGA开发板上实现了V-BLAST系统架构和三种检测算法,并通过仿真结果比较了每一种算法的复杂度和性能。仿真结果表明对于V-BLAST检测,ML具有最优的性能但复杂度最高;ZF算法具有较低的复杂度但比ML的性能略差;MMSE算法复杂度只比ZF算法略大但性能却有显著提升。 相似文献
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该文通过降低采样大小和信号检测搜索空间给出了两种低复杂度的多输入多输出(MIMO)系统粒子滤波(PF)检测方法:球形约束PF和多层映射PF。在球形约束PF中,首先基于迫零原则求得所需的球形约束,然后利用该球形约束减少粒子滤波过程中每一级重要性采样生成的粒子数。多层映射PF则采用多层映射将大小为4L的正交幅度调制(QAM)星座划分为L个4-QAM星座的级联以降低信号检测的搜索范围。计算机仿真结果表明,第1种方法能够在大发送天线数的情况下保持系统性能且有效地降低粒子滤波的计算复杂度;而第2种方法能够以较低的错误性能损失为代价获得计算复杂度的极大降低。 相似文献
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MIMO技术是LTE系统中的一个关键技术。在实际应用中,下行MIMO信号检测算法的选用需要在计算复杂度和系统性能之间取得合理的折中。文中对几种传统的检测算法—ML、MMSE、最优排序的SIC算法、QR分解算法、循环迭代QR分解算法进行了分析与研究。经仿真表明,除最大似然算法,循环迭代QR分解算法在这几种算法中性能是最好的。但是从计算复杂度出发,循环迭代QR分解算法远优于最大似然算法。所以,选用循环迭代QR分解算法运用于TD-LTE无线综合测试仪。 相似文献
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Jungwon Lee Ji-Woong Choi Hui-Ling Lou Jongsun Park 《Communications Letters, IEEE》2009,13(10):736-738
In this letter, we propose a soft-decoding ML MIMO demodulation method that lowers the complexity of the existing ML method. The proposed method finds the nearest point without calculating the Euclidean distance by exploiting the regular structure of bit-to-symbol mapping. It enables significant reduction of the number of distance calculations which is a major complexity burden. 相似文献
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New detection algorithms based on the jointly Gaussian approach and successive interference cancelation for iterative MIMO systems 下载免费PDF全文
Jie Wu Jie Zhong Yunlong Cai Minjian Zhao Wenyan Zhang 《International Journal of Communication Systems》2014,27(10):1964-1983
A new detection algorithm based on the jointly Gaussian approach (JGA) and successive interference cancelation (SIC), named the SIC‐JGA algorithm, is proposed for iterative MIMO systems. Both the a priori symbol estimates of the undetected layers and the a posteriori symbol estimates of the previously detected layers are used in the SIC process. To reduce the complexity of covariance matrix inversion in the proposed algorithm, simplified algorithms named S‐SIC‐JGA are investigated for both the single path and multipath block fading channels under M Phase Shift Keying modulations. A detailed complexity analysis is presented for both the SIC‐JGA and S‐SIC‐JGA algorithms. Numerical results exhibit that the system using the SIC‐JGA algorithm outperforms the JGA algorithm, with an additional complexity for determining the detection order of SIC. The S‐SIC‐JGA algorithm has a much lower complexity compared with the SIC‐JGA algorithm while experiencing an acceptable system performance degradation. Proper detection algorithms can be chosen in different iterations to balance the system performance and the detection complexity. Copyright © 2012 John Wiley & Sons, Ltd. 相似文献
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MIMO技术利用多根天线实现多发多收,能够在不增加传输带宽和发射功率的条件下,成倍地提高系统的数据速率;而预编码技术则可以利用接收端反馈回来的信道状态信息对信号进行预处理以改善信号的传输性能,从而达到消除干扰的目的,使得无线通信系统的可靠性得以提升。因此对MIMO系统预编码技术的研究,是解决如何提升无线通信系统性能的关键问题,具有重大的研究意义。 相似文献
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Zihuai Lin Pei Xiao Vucetic B. Sellathurai M. 《Wireless Communications, IEEE Transactions on》2010,9(1):60-65
This letter derives mathematical expressions for the received signal-to-interference-plus-noise ratio (SINR) of uplink Single Carrier (SC) Frequency Division Multiple Access (FDMA) multiuser MIMO systems. An improved frequency domain receiver algorithm is derived for the studied systems, and is shown to be significantly superior to the conventional linear MMSE based receiver in terms of SINR and bit error rate (BER) performance. 相似文献
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Yan Xin Zhengdao Wang Giannakis G.B. 《Wireless Communications, IEEE Transactions on》2003,2(2):294-309
We present a unified approach to designing space-time (ST) block codes using linear constellation precoding (LCP). Our designs are based either on parameterizations of unitary matrices, or on algebraic number-theoretic constructions. With an arbitrary number of N/sub t/ transmit- and N/sub r/ receive-antennas, ST-LCP achieves rate 1 symbol/s/Hz and enjoys diversity gain as high as N/sub t/N/sub r/ over (possibly correlated) quasi-static and fast fading channels. As figures of merit, we use diversity and coding gains, as well as mutual information of the underlying multiple-input-multiple-output system. We show that over quadrature-amplitude modulation and pulse-amplitude modulation, our LCP achieves the upper bound on the coding gain of all linear precoders for certain values of N/sub t/ and comes close to this upper bound for other values of N/sub t/, in both correlated and independent fading channels. Compared with existing ST block codes adhering to an orthogonal design (ST-OD), ST-LCP offers not only better performance, but also higher mutual information for N/sub t/>2. For decoding ST-LCP, we adopt the near-optimum sphere-decoding algorithm, as well as reduced-complexity suboptimum alternatives. Although ST-OD codes afford simpler decoding, the tradeoff between performance and rate versus complexity favors the ST-LCP codes when N/sub t/, N/sub r/, or the spectral efficiency of the system increase. Simulations corroborate our theoretical findings. 相似文献
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对轮询算法、最大载干比算法和比例公平算法三种经典的调度算法进行了深入的研究,并在MIMO系统环境中,对它们的性能进行了计算机仿真。从基本原理和仿真结果两个方面,对上述三种调度算法的公平性和系统吞吐量性能进行了对比分析,证明了轮询算法具有最好的公平性性能,最大载干比算法具有最好的吞吐量性能,比例公平算法则很好的在两者之间取得了一个平衡。 相似文献
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A new reduced-complexity Schnorr-Euchner decoding algorithm is proposed in this letter for uncoded multi-input multi-output systems with q-QAM (q=4,16,...) modulation. Furthermore, a Fano-like metric bias is introduced to the algorithm from the perspective of sequential decoding, as well as an early termination technique. Simulation results show that these modifications reduce the algorithm complexity efficiently, with only a small degradation in bit error rate at high signal to noise ratios. 相似文献