摘要：
信号带宽：信号频谱的宽度，也就是信号的最高频率分量与最低频率分量之差，譬如，一个由数个正弦波叠加成的方波信号，其最低频率分量是其基频，假定为f =2kHz，其最高频率分量是其7次谐波频率，即7f =7×2=14kHz，因此该信号带宽为7f- f =14-2=12kHz。信道带宽：信道可以不失真地传输信号的频率范围。为不同应用而设计的传输媒体具有不同的信道质量，所支持的带宽有所不同。信号传输频率的最大值和最小值之差(Hz)。信道带宽则限定了允许通过该信道的信号下限频率和上限频率，也就是限定了一个频率通带。比如一个信道允许的通带为1.5kHz至15kHz，其带宽为13.5kHz，上面这个 阅读全文
摘要：
In the computer room of CVPR conference, I am reading Nannan's blog about her feelings facing a suffering patient. I am shocked, by what she sees and by what she thinks.The oral session is being held, however, what the speaker is talking is tedious. Nannan's article makes me reflect the sign 阅读全文
摘要：
http://www.comsoc.org/best-readings-cognitive-radioBest Readings is a collection of Journal/Magazine Special Issues, books, articles, and papers on a featured topic. This Best Readings is on Cognitive Radio (CR) Communications and Networking. The contributors are: Ekram Hossain, Dusit Niyato, Ying-C 阅读全文