关键词：无线通信；干扰；自由度
摘 要：Actual communication systems have only finite channel diversity, and thus the practical implications of interference alignment are uncertain: Just how much channel diversity is required in order to get substantial benefit from interference alignment? The first part of this thesis focuses on this question. Our first result characterizes the degrees of freedom for the three-user interference channel as a function of time or frequency diversity. We next focus on spatial diversity, in the form of multiple antennas at transmitters and receivers.The second part of this thesis studies DNA sequencing from an information theory pointof-view. DNA sequencing is the basic workhorse of modern day biology and medicine.