目的研究轻中度吸烟慢性阻塞性肺病(COPD)患者戒烟意愿，并评价认知干预戒烟方法对其戒烟的效果。方法在门诊部收集轻中度吸烟COPD患......

In doubly-selective fading wireless channel, the conventional orthogonal frequency division multiplexing (OFDM) receiver......