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arXiv 1601.08062cs.ITmath.IT
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Quantization门限未知时基于导频的1比特信道估计性能分析

Performance Analysis for Pilot-based 1-bit Channel Estimation with Unknown Quantization Threshold

Manuel Stein, Shahar Bar, Josef A. Nossek, Joseph Tabrikian

摘要:

利用量化观测值进行参数估计在许多实际应用中具有重要意义。在由零阈值硬限幅器组成的对称$1$位设置下,众所周知,低信噪比(SNR)的大样本性能损失是中等的($\frac{2}π$或$-1.96$ dB)。这使得具有$1$位分辨率的低复杂度模数转换器(ADC)成为未来无线通信和信号处理设备的有前途的解决方案。然而,硬件缺陷和外部效应引入了具有不同于零的未知硬限制电平的量化器。在本文中,性能损失与导频为基础的信道估计,受到一个不对称的硬限制器与未知的偏移量,在两个设置下进行了研究。通过Cramér-Rao下界(CRLB)和随机参数设置的预期CRLB进行分析。我们的研究结果表明,未知的阈值会导致额外的信息损失,这消失了低信噪比值或偏移接近零时。

英文摘要:

Parameter estimation using quantized observations is of importance in many practical applications. Under a symmetric $1$-bit setup, consisting of a zero-threshold hard-limiter, it is well known that the large sample performance loss for low signal-to-noise ratios (SNRs) is moderate ($\frac{2}π$ or $-1.96$dB). This makes low-complexity analog-to-digital converters (ADCs) with $1$-bit resolution a promising solution for future wireless communications and signal processing devices. However, hardware imperfections and external effects introduce the quantizer with an unknown hard-limiting level different from zero. In this paper, the performance loss associated with pilot-based channel estimation, subject to an asymmetric hard limiter with unknown offset, is studied under two setups. The analysis is carried out via the Cramér-Rao lower bound (CRLB) and an expected CRLB for a setup with random parameter. Our findings show that the unknown threshold leads to an additional information loss, which vanishes for low SNR values or when the offset is close to zero.

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