Then we analysis and compare channel characteristics in time-domain,frequency-domain and spatial-domain followed by discussions on two schemes for transmitting digital multiple-beam,with highlight on digital beam-forming(DBF).

• 2分析、比较了信道的时域、频域、空域的特征; 3 讨论了两种发射数字多波束的形成方法,并重点介绍了数字波束形成技术;