Aiming at MIMO-OFDM system, four novel transmitter diversity schemes are designed and studied, and two robust detection algorithms are proposed for V-BLAST ( Vertical Bell Labs Layered Space-Time) OFDM systems based on array signal processing theory in this dissertation. 本论文主要针对MIMO-OFDM系统,设计和研究了四种新型的发射分集方法;并结合阵列信号处理,提出了V-BLAST(VerticalBellLabsLAyeredSpace-Time)OFDM系统中两种稳健的检测算法。