空时OFDM系统的Turbo检测

Turbo-Detection for Space-Time OFDM System

近年来,在频率选择性衰落环境下,作为一种有效的传输分集体制,空时-正交频分复用(ST-OFDM)技术受到了广泛的关注。但这种方法通常是在假定系统的循环前缀长度大于信道时延扩展的前提下应用的,而循环前缀的使用却降低了系统的传输效率。为此给出了一种ST-OFDM的Turbo解调方案,并在此基础上提供了一种新的信道估计方法。最后通过计算机模拟,证实了方案的有效性。

Recent year, as an effectively transmitter diversity method over frequency selective fading channel, ST-OFDM has get more attention to it. However, that method often requires cyclic-prefix, which degrade the transmitting efficient greatly. For this, a turbo-demodulate method and channel estimation method for ST- OFDM is present, which improve the efficiency of transmission of ST-OFDM system. And the two methods are examined through computer and good characteristics are confirmed.