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arXiv 1101.0970cs.ITmath.IT
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非对称量化器在低SNR时更好

Asymmetric Quantizers Are Better at Low SNR

Tobias Koch, Amos Lapidoth

摘要:

研究了在离散时间平均功率受限高斯信道的输出端采用一比特量化器时的信道容量特性。我们专注于低信噪比的制度,在非常低的频谱效率的通信发生,如在频谱和超宽带通信。众所周知,在这种情况下,对称的一位量化器将容量减少2/pi,这转化为大约2分贝的功率损耗。在这里,我们表明,如果采用非对称的一位量化器,如果使用非对称的信号星座,那么这两个分贝可以完全恢复。

英文摘要:

We study the behavior of channel capacity when a one-bit quantizer is employed at the output of the discrete-time average-power-limited Gaussian channel. We focus on the low signal-to-noise ratio regime, where communication at very low spectral efficiencies takes place, as in Spread-Spectrum and Ultra-Wideband communications. It is well know that, in this regime, a symmetric one-bit quantizer reduces capacity by 2/pi, which translates to a power loss of approximately two decibels. Here we show that if an asymmetric one-bit quantizer is employed, and if asymmetric signal constellations are used, then these two decibels can be recovered in full.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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