Xiao Liang

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—Interference alignment can help achieve high capacity in multiuser and multi-channel wireless interference environments. Because the degree of freedom (DOF) metric is defined under asymptotic signal to noise ratio (SNR), it has practical limitations under finite SNR. In addition, perfect interference alignment requires conditions on the number of antennas(More)
—Our investigation centers on the issue of linear precoding for hybrid-ARQ retransmissions in linear multi-input-multi-output (MIMO) channels driven by non-Gaussian inputs. Leveraging recent works on single transmission MIMO precoding [1], we derive the gradient of input-output mutual information with respect to precoder matrix for optimization. We further(More)
Polycyclic aromatic hydrocarbons (PAHs) are potentially carcinogenic, mutagenic and toxic to both human and non-human organisms. Dietary intake of PAHs is a dominant route of exposure for the general population where food crops are a major source of dietary PAHs. Over 20% of main food crops contain PAHs that exceed the control limits in China. However, the(More)