Iterative Space Time Block Equalizer for Single Carrier Systems with Receiver Nonlinearity
Iterative Space Time Block Equalizer for Single Carrier Systems with Receiver Nonlinearity
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DOI：
10.1109/wcnc51071.2022.9771797
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发表时间：
2022-04
期刊：
影响因子：
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通讯作者：
T. Rahman;V. Marojevic
中科院分区：
文献类型：
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作者：
T. Rahman;V. Marojevic
接收机非线性引起互调产物，这是由两个强相邻信道信号（称为阻塞器）引起的。对于色散环境中的多天线宽带系统，非线性失真效应明显更高，因为三阶互调产物降低了均衡过程输出处的信噪比（SNR）。这使解调过程复杂化并增加了误码率。本文认为，这种非线性失真的背景下，空时移键控（STSK）启用宽带单载波系统，并提出了一种迭代空时块均衡（ISTBE）的频域均衡框架。我们提出了一个实际的ISTBE接收机的设计的基础上的涡轮原理和数值证明，它有效地消除残留的符号间干扰，同时抑制高功率阻塞和带内互调失真，他们造成的。因此，所提出的系统是适合于简单的宽带射频前端工作在弱非线性区域，并使相邻信道频谱共存异构发射机和接收机的不同质量。
Receiver nonlinearity gives rise to intermodulation products that are caused by two strong adjacent channel signals called blockers. The nonlinear distortion effects are significantly higher for multiple antenna wideband systems in dispersive environments because third order intermodulation products decreases the signal-to-noise ratio (SNR) at the output of the equalization process. This complicates the demodulation process and increases the bit error rate. This paper considers such nonlinear distortion in the context of space-time shift keying (STSK)-enabled wideband single-carrier systems and proposes an iterative space-time block equalization (ISTBE) framework for frequency domain equalization. We present our design of a practical ISTBE receiver based on the turbo principle and numerically demonstrate that it effectively removes the residual inter-symbol interference while suppressing high-power blockers and the in-band intermodulation distortion that they cause. The proposed system is thus suitable for simple wideband radio frequency front ends operating in the weak nonlinear region and enables adjacent channel spectrum coexistence with heterogeneous transmitters and receivers of different qualities.