The increasing of symbol duration makes OFDM more robust against multipath transmission, whereas, it makes OFDM more sensitive to the time varying of wireless mobile channels.
符号时间的增加，使得OFDM系统具有良好的抗多径性能，但同时也使OFDM系统对于无线移动信道的时变性更加敏感。
Each pilot sub - carrier signal is placed at a different sub-carrier signal location for each successive symbol duration of the OFDM signal to form a sliding pilot sub-carrier signal.
对于OF DM信号的每个连续符号持续时间，每个导频子载波信号放在不同的子载波信号位置，以形成滑动导频子载波信号。
Reducing the data rate by one-half will double the duration of each symbol interval.
把数据率减少一半，就能使每一符号间隔的持续时间延长一倍。
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