Adaptive array employing eigenvector beam of maximum eigenvalue and fractionally-spaced TDL with real tap

This paper proposes a new digital beamforming adaptive array antenna (DBFAA A) that is effective in severe multipath environments in which timing and c arrier synchronization circuits cannot function ideally resulting in the DB FAAA losing control. The proposed DBFAAA has two stages. In the first, the DBFAAA captures the desired signal and establishes synchronization. In the second, the DBFAAA optimizes the beam pattern of the signal. The proposed c onfiguration employs an eigenvector beam of the maximum eigenvalue in the f irst stage beam-forming. in addition, a fractionally-spaced-tapped-delay-li ne (FS-TDL) with real tap weights, which is placed after the beam-former, i s applied to achieve timing synchronization. The behavior of the proposed D BFAAA for asynchronous sampling data is investigated and the results indica te that the proposed configuration enables asynchronous sampling at the A/D converter. A prototype of the proposed DBFAAA achieving 38-Mbps real-time data communication is introduced and the transmission performance is shown.