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首页> 外文期刊>Indian Journal of Science and Technology >Performance Analysis of Efficient Power Allocation Techniques with Different Modulation for 4X4 V-BLAST MIMO-OFDM System
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Performance Analysis of Efficient Power Allocation Techniques with Different Modulation for 4X4 V-BLAST MIMO-OFDM System

机译：4X4 V-BLAST MIMO-OFDM系统不同调制有效功率分配技术的性能分析

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Objectives: To propose an optimal power allocation method for high-speed V-BLAST MIMO-OFDM system for better performance in terms of SNR and BER than the traditional methods. Materials and Methods: To study and evaluate the performance of two linear channel estimators, the Least Square Error (LS) and Linear Minimum Mean Square Error (LMMSE) are used for 4 × 4 VBLAST Multiple input, multiple output-orthogonal frequency division multiplexing (MIMOOFDM) system with different modulation-4 QAM,16QAM and 64 QAM. For power allocation, optimal power is determined by the Greedy Power Allocation and the Cuckoo Search algorithm depending on the condition of the carriers measured from the channel estimation. Findings: Based on the detection method, Vertical Bell Labs Layered Space-Time (V-BLAST) MIMO-OFDM is found to be the high-speed system. Here, the proposed optimal power allocation method for high-speed V-BLAST MIMO-OFDM system showed a better performance in terms of Signal to Noise Ratio (SNR) and BER than the traditional methods. This thesis work has been evaluated based on different channel estimation with different modulation techniques for V-BLAST MMSE MIMO-OFDM System. The test program has been implemented in the latest technology system in Matlab R2013a. The experimental results show that our proposed method achieves better performance in terms of Bit Error Rate (BER) and SNR compared with the existing methods used for improving the performance of the MIMOOFDM. Linear MMSE proved efficient channel estimation technique over LS. MMSE -OSIC achieves very good performance with respect to other detectors in VBLAST MIMO-OFDM environment for 4× 4 MIMO-OFDM systems. Application: This result would be useful to make efficient Adaptive MIMO-OFDM system. It would be also useful in adaptive modulation and power allocation concept for making better wireless communication system. This performance analysis can perform for different channel models.
机译：目的：提出一种用于高速V-BLAST MIMO-OFDM系统的最佳功率分配方法，以在信噪比（SNR）和误码率（BER）方面实现比传统方法更好的性能。材料和方法：为了研究和评估两个线性信道估计器的性能，将最小平方误差（LS）和线性最小均方误差（LMMSE）用于4×4 VBLAST多输入，多输出正交频分复用（ MIMOOFDM）系统具有不同的调制能力-4 QAM，16QAM和64 QAM。对于功率分配，最佳功率由贪婪功率分配和布谷鸟搜索算法决定，具体取决于从信道估计中测得的载波状况。发现：基于检测方法，发现垂直贝尔实验室分层时空（V-BLAST）MIMO-OFDM是高速系统。在此，针对高速V-BLAST MIMO-OFDM系统提出的最佳功率分配方法在信噪比（SNR）和BER方面均比传统方法具有更好的性能。本文基于V-BLAST MMSE MIMO-OFDM系统的信道估计和调制技术，对本文的工作进行了评估。该测试程序已在Matlab R2013a的最新技术系统中实施。实验结果表明，与现有用于改善MIMOOFDM性能的方法相比，本文提出的方法在误码率（BER）和信噪比（SNR）方面具有更好的性能。线性MMSE在LS上证明了有效的信道估计技术。相对于VBLAST MIMO-OFDM环境中用于4×4 MIMO-OFDM系统的其他检测器，MMSE -OSIC具有非常好的性能。应用：该结果对于建立高效的自适应MIMO-OFDM系统将很有用。在自适应调制和功率分配概念中，对于制造更好的无线通信系统也是有用的。此性能分析可以针对不同的渠道模型执行。

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