| Joint receiving mechanism based on blind equalization with variable step size for M-QAM modulation |
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| 作者姓名： | 卢继华 Abdallah Elhirtsia AHMED 王晓华 Kheddar BOUDJEMAA |
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| 作者单位： | School of Information and Electronics, Beijing Institute of Technology, Beijing 100081, China,School of Information and Electronics, Beijing Institute of Technology, Beijing 100081, China,School of Information and Electronics, Beijing Institute of Technology, Beijing 100081, China,School of Mechatronic Engineering, Beijing Institute of Technology, Beijing 100081, China |
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| 基金项目： | Supported by the National Natural Science Foundation of China (61002014; 61101129; 61227001; 61072050) |
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| 摘 要： | The problem of inter symbol interference (ISI) in wireless communication systems caused by multipath propagation when using high order modulation like M-QAM is solved. Since the wireless receiver doesn't require a training sequence, a blind equalization channel is implemented in the receiver to increase the throughput of the system. To improve the performances of both the blind equalizer and the system, a joint receiving mechanism including variable step size (VSS) modified constant modulus algorithms (MCMA) and modified decision directed modulus algorithms (MDDMA) is proposed to ameliorate the convergence speed and mean square error (MSE) performance and combat the phase error when using high order QAM modulation. The VSS scheme is based on the selection of step size according to the distance between the output of the equalizer and the desired output in the constellation plane. Analysis and simulations show that the performance of the proposed VSS-MCMA-MDDMA mechanism is better than that of algorithms with a fixed step size. In addition, the MCMA-MDDMA with VSS can perform the phase recovery by itself.
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| 关 键 词： | inter symbol interference (ISI) modified constant modulus algorithm (MCMA) modified decision directed modulus algorithm (MDDMA) variable step size blind equalization phase rotation |
| 收稿时间： | 2014/2/22 0:00:00 |
Joint receiving mechanism based on blind equalization with variable step size for M-QAM modulation |
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| LU Ji-hu,Abdallah Elhirtsia AHMED,WANG Xiao-hua and Kheddar BOUDJEMAA.Joint receiving mechanism based on blind equalization with variable step size for M-QAM modulation[J].Journal of Beijing Institute of Technology,2015,24(3):381-386. |
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| Authors: | LU Ji-hu Abdallah Elhirtsia AHMED WANG Xiao-hua and Kheddar BOUDJEMAA |
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| Affiliation: | 1. School of Information and Electronics,Beijing Institute of Technology,Beijing 100081,China;2. School of Mechatronic Engineering,Beijing Institute of Technology,Beijing 100081,China |
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| Abstract: | The problem of inter symbol interference (ISI) in wireless communication systems caused by multipath propagation when using high order modulation like M-QAM is solved. Since the wireless receiver doesn't require a training sequence, a blind equalization channel is implemented in the receiver to increase the throughput of the system. To improve the performances of both the blind equalizer and the system, a joint receiving mechanism including variable step size (VSS) modified constant modulus algorithms (MCMA) and modified decision directed modulus algorithms (MDDMA) is proposed to ameliorate the convergence speed and mean square error (MSE) performance and combat the phase error when using high order QAM modulation. The VSS scheme is based on the selection of step size according to the distance between the output of the equalizer and the desired output in the constellation plane. Analysis and simulations show that the performance of the proposed VSS-MCMA-MDDMA mechanism is better than that of algorithms with a fixed step size. In addition, the MCMA-MDDMA with VSS can perform the phase recovery by itself. |
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| Keywords: | inter symbol interference (ISI) modified constant modulus algorithm (MCMA) modified decision directed modulus algorithm (MDDMA) variable step size blind equalization phase rotation |
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