A MIMO-OFDM system for high-speed transmission
A MIMO-OFDM system for high-speed transmission
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DOI：
10.1109/vetecf.2003.1285066
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
Y. Ogawa;K. Nishio;T. Nishimura;T. Ohgane
中科院分区：
文献类型：
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作者：
Y. Ogawa;K. Nishio;T. Nishimura;T. Ohgane
针对高速传输的MIMO-OFDM系统，提出了一种新的空分复用信号检测方法。信道估计对于抑制干扰和解复用信号是非常重要的。在诸如IEEE 802.11a的无线局域网系统中，在每个副载波中仅插入几个训练符号。提出了一种适用于每个子载波具有两个训练符号的MIMO-OFDM系统的信道估计方法。其基本思想是估计发射天线和接收天线之间的时域信道响应。对它们进行快速傅里叶变换，计算出每个副载波的阵列响应矢量。然后，我们可以得到自适应权值来消除干扰。我们表明，使用具有较低条件数的用于信道估计的矩阵的训练符号提高了估计精度。
We propose new signal detection for space division multiplexing in a MIMO-OFDM system for high data rate transmission. Channel estimation is very important for suppressing the interference and demultiplexing the signals. In a wireless LAN system, such as IEEE 802.11a, only a few training symbols are inserted in each subcarrier. We propose a channel estimation method for the MIMO-OFDM system with two training symbols per subcarrier. The basic idea is to estimate the time-domain channel responses between the transmit and receive antennas. Applying the fast Fourier transform to them, the array response vectors for each subcarrier are calculated. Then, we can obtain the adaptive weights to cancel the interference. We show that employing training symbols having a lower condition number of a matrix used for the channel estimation improves the estimation accuracy.