Performance evaluation of OFDM and single-carrier systems using frequency domain equalization and phase modulation
Performance evaluation of OFDM and single-carrier systems using frequency domain equalization and phase modulation
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DOI：
10.1002/dac.1125
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发表时间：
2011-01-01
影响因子：
2.1
通讯作者：
El-Samie, Fathi E. Abd
中科院分区：
文献类型：
--
作者：
Hassan, Emad S.;Zhu, Xu;El-Samie, Fathi E. Abd
本文研究了基于连续相位调制(CPM)的正交频分复用(CPM-OFDM)系统的性能。提出了一种适用于宽带无线通信系统的基于CPM的单载波频域均衡(CPM-SC-FDE)结构。该结构结合了SC-FDE低复杂度的优点，并利用了CPM的信道频率分集和功率效率。CPM-ofdm系统和所提出的系统都用FDE实现，避免了均衡的复杂性。考虑并比较了两种频域均衡器：迫零(ZF)均衡器和最小均方误差(MMSE)均衡器。针对不同的多径衰落信道进行了仿真实验。仿真结果表明，基于CPM的系统在多径衰落时的性能优于单径衰落时的性能。对于CPM-ofdm系统和所提出的CPM-SC-FDE系统，在多径信道上的性能分别比在单径信道上的性能提高至少5d B和12d B。仿真结果还表明，将CPM应用于SC-FDE系统时，系统的性能比CPM-ofdm系统高出约5dB.版权所有(C)2010 John Wiley&Sons，Ltd.
In this paper, we study the performance of the continuous phase modulation (CPM)-based orthogonal frequency division multiplexing (CPM-OFDM) system. Also, we propose a CPM-based single-carrier frequency domain equalization (CPM-SC-FDE) structure for broadband wireless communication systems. The proposed structure combines the advantages of the low complexity of SC-FDE, in addition to exploiting the channel frequency diversity and the power efficiency of CPM. Both the CPM-OFDM system and the proposed system are implemented with FDE to avoid the complexity of the equalization. Two types of frequency domain equalizers are considered and compared for performance evaluation of both systems; the zero forcing (ZF) equalizer and the minimum mean square error (MMSE) equalizer. Simulation experiments are performed for a variety of multipath fading channels. Simulation results show that the performance of the CPM-based systems with multipath fading is better than their performance with single path fading. The performance over a multipath channel is at least 5 and 12 dB better than the performance over a single path channel, for the CPM-OFDM system and the proposed CPM-SC-FDE system, respectively. The results also show that, when CPM is utilized in SC-FDE systems, they can outperform CPM-OFDM systems by about 5 dB. Copyright (C) 2010 John Wiley & Sons, Ltd.