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arXiv 0905.4303cs.ITmath.IT
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接收端低精度相位Quantization的块非相干通信

On Block Noncoherent Communication with Low-Precision Phase Quantization at the Receiver

Jaspreet Singh, Upamanyu Madhow

摘要:

我们考虑在块非相干加性高斯白噪声信道的通信与低精度模数转换器(ADC)在接收机。对于标准的均匀相移键控(PSK)调制,我们研究了仅量化接收信号相位的接收器架构的性能;这具有无需自动增益控制即可实现的优势,使用多个1位ADC,前面是模拟乘法器。我们研究的过渡密度的结构所产生的通道模型。几个结果,在通道中固有的对称性的基础上,提供这种过渡密度的特征。使用这些结果获得用于计算信道容量的低复杂度过程。QPSK的数值容量计算表明,接收信号的8-bin相位量化恢复了未量化观测所获得的容量的80- 85%以上,而12-bin相位量化恢复了未量化容量的90- 95%以上。抖动的星座,以提高性能,在面对激烈的量化。

英文摘要:

We consider communication over the block noncoherent AWGN channel with low-precision Analog-to-Digital Converters (ADCs) at the receiver. For standard uniform Phase Shift Keying (PSK) modulation, we investigate the performance of a receiver architecture that quantizes only the phase of the received signal; this has the advantage of being implementable without automatic gain control, using multiple 1-bit ADCs preceded by analog multipliers. We study the structure of the transition density of the resulting channel model. Several results, based on the symmetry inherent in the channel, are provided to characterize this transition density. A low complexity procedure for computing the channel capacity is obtained using these results. Numerical capacity computations for QPSK show that 8-bin phase quantization of the received signal recovers more than 80-85 % of the capacity attained with unquantized observations, while 12-bin phase quantization recovers above 90-95 % of the unquantized capacity. Dithering the constellation is shown to improve the performance in the face of drastic quantization.

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