一种高效率的空频传输体制

High efficient space-frequency transmitter diversity for OFDM

在频率选择性衰落环境下,作为一种有效的传输分集体制,空频 正交频分复用(spacefrequency orthogonalfrequencydivisionmultiplexing,SF OFDM)技术得到了广泛的关注。但是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大大降低了系统的传输效率,如果能压缩甚至去掉循环前缀,而保持系统性能不变,则是很有意义的。为此给出一种新的SF OFDM解调方式,利用循环重构抵消手段减少甚至去掉了循环前缀。最后通过计算机模拟,证实了这种解调方式的有效性。

As an effective transmitter diversity method over frequency selectie fading channel, space frequency-orthogonal frequency division multiplexing (SF-OFDM) has got more attention to it. However, that method often requires cyclic-prefix, which can degrade the transmitting efficient very much. For this a new demodulate method for SF-OFDM, which improves the efficiency of transmission of SF-OFDM system is given. And this method is examined through computer and good characteristics are confirmed.