A cancer screening test is typically administered within asymptomatic populations,with the goal of detecting consequential cancer or precancerous changes at the earliest possible stage,allowing for interventions that ...A cancer screening test is typically administered within asymptomatic populations,with the goal of detecting consequential cancer or precancerous changes at the earliest possible stage,allowing for interventions that can enhance survival outcomes or reduce morbidity.However,currently,only breast,lung,cervical,and colorectal cancer have reliable screening methods,which have received Grade A or B recommendations by US Preventive Services Task Force(USPSTF)[1].These singlecancer screening tests are not perfect,the false-positive rates(FPRs)were quite high(5%–15%),resulting low positive predictive values(PPVs)of around 5%–10%[2].Besides,the majority of cancers,including esophageal,pancreatic,and ovarian cancers,lack guideline-recommended screening methods,often leading to diagnoses at advanced stages with a particularly bleak prognosis.展开更多
Introducing multiple-input multiple-output（MIMO） relay channel could offer significant capacity gain. And it is of great importance to develop effective power allocation strategies to achieve power efficiency and im...Introducing multiple-input multiple-output（MIMO） relay channel could offer significant capacity gain. And it is of great importance to develop effective power allocation strategies to achieve power efficiency and improve channel capacity in amplify-and-forward relay system. This article investigates a two-hop MIMO relay system with multiple antennas in relay node （RN） and receiver （RX）. Maximizing capacity with antenna selection（MCAS） and maximizing capacity with eigen-decomposition （MCED） schemes are proposed to efficiently allocate power among antennas in RN under first and second hop limited scenarios. The analysis and simulation results show that both MCED and MCAS can improve the channel capacity compared with uniform power allocation （UPA） scheme in most of the studied areas. The MCAS bears comparison with MCED with an acceptable capacity loss, but lowers the complexity by saving channel state information （CSI） feedback to the transmitter （TX）. Moreover, when the RN is close to RX, the performance of UPA is also close to the upper bound as the performance of first hop is limited.展开更多
基金supported by Shanghai Sailing Program(21YF1440200).
文摘A cancer screening test is typically administered within asymptomatic populations,with the goal of detecting consequential cancer or precancerous changes at the earliest possible stage,allowing for interventions that can enhance survival outcomes or reduce morbidity.However,currently,only breast,lung,cervical,and colorectal cancer have reliable screening methods,which have received Grade A or B recommendations by US Preventive Services Task Force(USPSTF)[1].These singlecancer screening tests are not perfect,the false-positive rates(FPRs)were quite high(5%–15%),resulting low positive predictive values(PPVs)of around 5%–10%[2].Besides,the majority of cancers,including esophageal,pancreatic,and ovarian cancers,lack guideline-recommended screening methods,often leading to diagnoses at advanced stages with a particularly bleak prognosis.
基金This work is supported by the Ericsson Company and National NaturalScience Foundation of China(60496312)．
文摘Introducing multiple-input multiple-output（MIMO） relay channel could offer significant capacity gain. And it is of great importance to develop effective power allocation strategies to achieve power efficiency and improve channel capacity in amplify-and-forward relay system. This article investigates a two-hop MIMO relay system with multiple antennas in relay node （RN） and receiver （RX）. Maximizing capacity with antenna selection（MCAS） and maximizing capacity with eigen-decomposition （MCED） schemes are proposed to efficiently allocate power among antennas in RN under first and second hop limited scenarios. The analysis and simulation results show that both MCED and MCAS can improve the channel capacity compared with uniform power allocation （UPA） scheme in most of the studied areas. The MCAS bears comparison with MCED with an acceptable capacity loss, but lowers the complexity by saving channel state information （CSI） feedback to the transmitter （TX）. Moreover, when the RN is close to RX, the performance of UPA is also close to the upper bound as the performance of first hop is limited.
