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引用次数: 5
摘要
多输入多输出(MIMO)与多载波码分多址(MC-CDMA)相结合是4G宽带无线通信中实现高性能、高数据速率的一种很有前途的技术。然而，大功率放大器(HPA)的非线性对MIMO MC-CDMA系统的性能起着至关重要的作用。本文研究了非线性HPA存在下VBLAST MIMO MC-CDMA系统的性能。为了说明这一事实，考虑了不同的接收器，如ZF, IC-ZF, MMSE IC-MMSE和QR-ML，并进行了相互比较。具体来说，我们评估了系统在瑞利衰落信道下运行时，HPA非线性对误码率(BER)的影响。给出了数值结果，并显示了几个系统参数，如接收机类型、发射和接收天线数量、用户数量和扩展因子长度对系统性能的影响。
On the effect of High Power Amplifier Nonlinearity on MIMO MC-CDMA systems
The combination of Multiple-Input Multiple-Output (MIMO) with Multi-Carrier Code Division Multiplexing Access (MC-CDMA) is a promising technique for achieving high performance with very high data rates in 4G broadband wireless communications. Nevertheless, Nonlinearity of High-Power Amplifier (HPA) plays a crucial role in the performance of MIMO MC-CDMA systems. In this paper, we investigate the performance of VBLAST MIMO MC-CDMA system in the presence of nonlinear HPA. In order to illustrate this fact, different receivers, such as ZF, IC-ZF, MMSE IC-MMSE and QR-ML, are considered and mutually compared. Specifically, we assess the impact of HPA nonlinearity on the Bit Error Rate (BER), when the system is operated under Rayleigh fading channel. Numerical results are provided and show the effects of several system parameters, such as type of receivers, number of transmit and receive antennas, number of users and spreading factor length, on system performance.
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